As filed with the Securities and Exchange Commission on June 6, 2005
                         Registration Number 333-123863

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                 AMENDMENT NO 1
                                       TO
                                    FORM S-3

             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                         CALLISTO PHARMACEUTICALS, INC.
                 (Name of Small Business Issuer in its Charter)

         Delaware                                                 13-3894575
(State or other jurisdiction                                  (I.R.S. Employer)
of incorporation or organization)                            Identification No.)

                        420 Lexington Avenue, Suite 1609
                            New York, New York 10170
                                 (212) 297-0010
               (Address, including zip code, and telephone number,
                  including area code of registrant's principal
                               executive offices)

                                  Gary S. Jacob
                             Chief Executive Officer
                         Callisto Pharmaceuticals, Inc.
                        420 Lexington Avenue, Suite 1609
                            New York, New York 10170
                                 (212) 297-0010
  (Name, address, including zip code, and telephone number, including area code
                              of agent for service)

                                   Copies to:
                            Jeffrey J. Fessler, Esq.
                       Sichenzia Ross Friedman Ference LLP
                     1065 Avenue of the Americas, 21st Floor
                            New York, New York 10018
                                 (212) 930-9700

Approximate  date of commencement  of proposed sale to the public:  From time to
time  after  the  effective  date of this  Registration  Statement. 

If the only securities  being registered on this form are to be offered pursuant
to dividend or interest reinvestment plans, please check the following box. [ ]

If any of the  securities  being  registered on this Form are to be offered on a
delayed or continuous  basis  pursuant to Rule 415 under the  Securities  Act of
1933, check the following box. [X]

If this form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the  Securities  Act  registration  statement  number of the  earlier  effective
registration statement for the same offering. [ ]

If this form is a  post-effective  amendment filed pursuant to Rule 462(c) under
the Securities  Act,  please check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [ ]

If delivery  of the  prospectus  is  expected  to be made  pursuant to Rule 434,
please check the following box. [ ]






THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATE(S)
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT  SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY  STATES THAT THIS REGISTRATION  STATEMENT
SHALL  THEREAFTER  BECOME  EFFECTIVE  IN  ACCORDANCE  WITH  SECTION  8(a) OF THE
SECURITIES ACT OF 1933, AS AMENDED,  OR UNTIL THE  REGISTRATION  STATEMENT SHALL
BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION  ACTING PURSUANT TO SAID SECTION
8(a) MAY DETERMINE.






                                       2



The  information  in this  prospectus  is not complete  and may be changed.  The
securities  may not be sold  until the  registration  statement  filed  with the
Securities and Exchange Commission is effective. This prospectus is not an offer
to  sell  these  securities  and it is not  soliciting  an  offer  to buy  these
securities in any state where the offer or sale is not permitted.

PROSPECTUS
                    SUBJECT TO COMPLETION, DATED JUNE 6, 2005

                         CALLISTO PHARMACEUTICALS, INC.

                        1,985,791 Shares of Common Stock

The selling  stockholders  named in this  prospectus  are offering to sell up to
1,985,791  shares of common stock of Callisto  Pharmaceuticals,  Inc.  which are
currently issued and outstanding and were previously issued by us to the selling
stockholders in a private  placement.  We will not receive any proceeds from the
resale of shares of our common stock.

Our common stock  currently  trades on the  American  Stock  Exchange  under the
symbol "KAL." On June 3, 2005, the last reported sale price for our common stock
on the American Stock Exchange was $1.01 per share.

The  securities  offered in this  prospectus  involve a high degree of risk. See
"Risk Factors"  beginning on page 7 of this prospectus to read about factors you
should consider before buying shares of our common stock.

The selling  stockholders are offering these shares of common stock. The selling
stockholders  may sell all or a  portion  of these  shares  from time to time in
market transactions through any market on which our common stock is then traded,
in negotiated transactions or otherwise, and at prices and on terms that will be
determined by the then prevailing  market price or at negotiated prices directly
or through a broker or  brokers,  who may act as agent or as  principal  or by a
combination of such methods of sale. The selling  stockholders  will receive all
proceeds from the sale of the common stock.  For  additional  information on the
methods  of  sale,   you  should  refer  to  the  section   entitled   "Plan  of
Distribution."

Neither  the  Securities  and  Exchange  Commission  nor  any  state  securities
commission has approved or disapproved of these securities or determined whether
this prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

                   The date of this Prospectus is _____, 2005






                                       3




                                TABLE OF CONTENTS

                                                                            Page

Where You Can Find More Information.........................................   5

Incorporation of Documents By Reference.....................................   5

Summary.....................................................................   5

Risk Factors................................................................   7

Forward-Looking Statements..................................................  18

Use of Proceeds.............................................................  18

Selling Stockholders........................................................  19

Plan of Distribution........................................................  20

Legal Matters...............................................................  22

Experts.....................................................................  22


You may only rely on the  information  contained in this  prospectus  or that we
have  referred  you to.  We have  not  authorized  anyone  to  provide  you with
different information. This prospectus does not constitute an offer to sell or a
solicitation  of an offer to buy any  securities  other  than the  common  stock
offered by this prospectus. This prospectus does not constitute an offer to sell
or a solicitation  of an offer to buy any common stock in any  circumstances  in
which such offer or  solicitation  is  unlawful.  Neither  the  delivery of this
prospectus nor any sale made in connection with this prospectus shall, under any
circumstances,  create  any  implication  that  there  has been no change in our
affairs since the date of this prospectus or that the  information  contained by
reference to this prospectus is correct as of any time after its date.






                                       4


                       WHERE YOU CAN FIND MORE INFORMATION

This  prospectus is part of a  registration  statement that we filed on Form S-3
with the Securities  and Exchange  Commission or SEC. This  prospectus  does not
contain all of the  information in the  registration  statement and the exhibits
and schedules that were filed with the registration statement.  You should refer
to the registration statement for additional information about us and the common
stock  being  offered in this  prospectus.  Statements  made in this  prospectus
regarding  the contents of any  contract,  agreement or other  document  that is
filed as an exhibit to the registration  statement or any document  incorporated
by reference into the registration  statement are not necessarily complete,  and
you should review the referenced document itself for a complete understanding of
its terms.

We file  annual,  quarterly  and special  reports,  proxy  statements  and other
information with the SEC. You may read and copy any document that we file at the
SEC's public reference  facilities  located at 450 Fifth Street,  NW, Room 1024,
Washington,  DC 20549,  and at the SEC's  regional  offices at 500 West  Madison
Street, Suite 1400, Chicago, Illinois 60661 and Woolworth Building, 233 Broadway
New York, New York. Copies of all or any part of the registration  statement may
be  obtained  from the SEC  upon  payment  of the  prescribed  fee.  Information
regarding the operation of the public reference rooms may be obtained by calling
the SEC at  1-800-SEC-0330.  Our SEC filings are also  available  to you free of
charge at the SEC's web site at http://www.sec.gov.

                     INCORPORATION OF DOCUMENTS BY REFERENCE

The SEC  allows us to  'incorporate  by  reference'  the  information  into this
prospectus.  This means that we can  disclose  important  information  to you by
referring you to another document filed separately with the SEC. The information
that we  incorporate  by reference is considered to be part of this  prospectus.
Because we are  incorporating by reference our future filings with the SEC, this
prospectus  is  continually  updated  and those  future  filings  may  modify or
supersede  some  or all of the  information  included  or  incorporated  in this
prospectus.  This  means  that you must look at all of the SEC  filings  that we
incorporate  by  reference  to  determine  if  any  of the  statements  in  this
prospectus or in any document  previously  incorporated  by reference  have been
modified or superseded.  This prospectus incorporates by reference the documents
listed  below and any future  filings  we will make with the SEC under  Sections
13(a),  13(c),  14 or 15(d) of the  Securities  Exchange  Act of 1934  until the
selling  stockholders  sell  all of  our  common  stock  registered  under  this
prospectus.

          o    our  annual  report on Form  10-K/A  for the  fiscal  year  ended
               December 31, 2004;

          o    our quarterly report on Form 10-Q filed on May 16, 2005;

          o    our  current  reports  on Form 8-K  filed on  February  3,  2005,
               February 7, 2005,  February 14, 2005,  March 15, 2005,  March 30,
               2005 and April 8, 2005; and

          o    the  description  of our common stock  contained in Item 1 of our
               Registration Statement on Form 8-A, dated October 22, 2004;

The information  about us contained in this  prospectus  should be read together
with the information in the documents incorporated by reference. You may request
a copy of any or all of these filings,  at no cost, by writing or telephoning us
at Callisto  Pharmaceuticals,  Inc., 420 Lexington Avenue, Suite 1609, New York,
New York 10170, Telephone: (212) 297-0010

                                     SUMMARY

This summary highlights information contained elsewhere in this prospectus.  You
should read the entire  prospectus  carefully,  including,  the section entitled
"Risk  Factors"  before  deciding  to  invest  in  our  common  stock.  Callisto
Pharmaceuticals,  Inc. is referred to throughout  this prospectus as "Callisto,"
"we" or "us."

We are a biopharmaceutical  company focused on the development of drugs to treat
relapsed  (failure  of prior  therapy)  acute  leukemia,  multiple  myeloma  (an
incurable  blood cancer that invades and  proliferates  in bone  marrow),  other
cancers and osteolytic  bone disease (bone disease caused by white blood cells).
Our  lead  drug  candidate,  Annamycin,  a drug  from the  anthracycline  family
(chemotherapy drugs which are also antibiotics), earlier completed a Phase I/IIa
trial in leukemia patients who had residual leukemic cells (refractory) in their
bodies. Annamycin, originally developed by scientists at The University of Texas
M.D. Anderson Cancer Center to address the clinical limitations  associated with
anthracycline drugs such as Adriamycin (doxorubicin) to treat cancer, is planned
to begin a trial at The University of Texas M.D. Anderson Cancer Center in adult
relapsed  acute  lymphocytic  leukemia  (ALL)  patients in  mid-2005  which will
include an initial  evaluation of a small number of patients (2 cohorts totaling
approximately  6  patients)  in a Phase  I/IIa  trial that will be rolled into a
larger  Phase IIb trial.  We also expect to commence  two  additional  trials of
Annamycin in 2005,  a single agent trial in pediatric  relapsed ALL patients and
in  combination  with Ara-C  (cytosine  arabinoside)  in relapsed  acute myeloid
leukemia (AML) patients.

                                       5


Our  second  drug  candidate,  Atiprimod,  is  an  orally  available  drug  with
antiproliferative and antiangiogenic activity. Atiprimod commenced a Phase I/IIa
clinical trial in relapsed  multiple myeloma patients on May 26, 2004. These are
patients that no longer respond to  chemotherapy,  and are in advanced stages of
the disease.  The Phase I/IIa clinical trial is currently being enrolled at four
sites, The University of Texas M.D.  Anderson Cancer Center  (Houston,  TX), the
Dana-Farber  Cancer  Institute  (Boston,  MA), the St.  Vincent's  Comprehensive
Cancer  Center (New York,  NY) and the Roswell Park Cancer  Institute  (Buffalo,
NY).

On January 6, 2004, we announced that the Office of Orphan Products  Development
of the United  States Food and Drug  Administration  (FDA)  granted  orphan drug
designation to Atiprimod for the treatment of multiple myeloma.

RECENT DEVELOPMENTS

On  March  9,  2005 we sold and  issued  in a  private  placement  an  aggregate
1,985,791  shares of common stock at a per share price of $1.52,  for  aggregate
gross proceeds of  approximately  $3.02 million.  Because this  transaction  was
completed with certain existing  institutional  shareholders and certain members
of our  management  we paid no fees to selling  agents and have agreed to file a
registration  statement  covering  resale  of the  shares  within 30 days of the
closing.

On March 15, 2005 we announced a second Phase I/IIa  clinical trial of Atiprimod
in advanced cancer patients.  The new trial is entitled: "An Open Label Study of
the Safety and  Efficacy of  Atiprimod  Treatment  for  Patients  with  Advanced
Cancer".  The  trial  protocol  received  Institutional  Review  Board,  or IRB,
approval on February 22, 2005 at The  University of Texas M.D.  Anderson  Cancer
Center.  Site  initiation was completed on March 3, 2005, and patient  screening
and dosing began in April, 2005.

HISTORY

In March 2002, Callisto  Pharmaceuticals,  Inc. ("Old Callisto") purchased 99.7%
of the outstanding  common shares of Webtronics,  Inc.,  ("Webtronics") a public
company for $400,000. Webtronics was incorporated in Florida on February 2, 2001
and had limited operations at December 31, 2002.

On April 30, 2003,  pursuant to an Agreement  and Plan of Merger dated March 10,
2003,  as amended  April 4, 2003,  Synergy  Acquisition  Corp.,  a  wholly-owned
subsidiary of Webtronics merged into Synergy  Pharmaceuticals  Inc.  ("Synergy")
and Callisto  Acquisition Corp., a wholly-owned  subsidiary of Webtronics merged
into Old Callisto  (collectively,  the "Merger"). As a result of the Merger, Old
Callisto and Synergy became  wholly-owned  subsidiaries  of  Webtronics.  In the
Merger  Webtronics  issued 17,318,994 shares of its common stock in exchange for
outstanding  Old Callisto  common stock and an  additional  4,395,684  shares in
exchange for outstanding  Synergy common stock. Old Callisto changed its name to
Callisto  Research Labs, LLC  ("Callisto  Research") and Webtronics  changed its
name to Callisto  Pharmaceuticals,  Inc. and changed its state of  incorporation
from Florida to Delaware. Subsequently, 171,818 shares of common stock issued to
former  Synergy  shareholders  were  returned  to us under the terms of  certain
indemnification agreements.

Our principal  executive office is located at 420 Lexington Avenue,  Suite 1609,
New York, New York 10170

                                       6


                                  RISK FACTORS

AN  INVESTMENT  IN OUR SHARES  INVOLVES A HIGH DEGREE OF RISK.  BEFORE MAKING AN
INVESTMENT DECISION, YOU SHOULD CAREFULLY CONSIDER ALL OF THE RISKS DESCRIBED IN
THIS  PROSPECTUS.  IF ANY OF THE RISKS  DISCUSSED  IN THIS  PROSPECTUS  ACTUALLY
OCCUR,  OUR BUSINESS,  FINANCIAL  CONDITION  AND RESULTS OF OPERATIONS  COULD BE
MATERIALLY  AND  ADVERSELY  AFFECTED.  IF THIS WERE TO HAPPEN,  THE PRICE OF OUR
SHARES  COULD  DECLINE  SIGNIFICANTLY  AND  YOU MAY  LOSE  ALL OR A PART OF YOUR
INVESTMENT. OUR FORWARD-LOOKING STATEMENTS IN THIS PROSPECTUS ARE SUBJECT TO THE
FOLLOWING RISKS AND  UNCERTAINTIES.  OUR ACTUAL RESULTS COULD DIFFER  MATERIALLY
FROM THOSE ANTICIPATED BY OUR FORWARD-LOOKING STATEMENTS AS A RESULT OF THE RISK
FACTORS BELOW. SEE "FORWARD-LOOKING STATEMENTS."

RISKS RELATED TO OUR BUSINESS

WE ARE AT AN EARLY STAGE OF DEVELOPMENT  AS A COMPANY,  CURRENTLY HAVE NO SOURCE
OF REVENUE AND MAY NEVER BECOME PROFITABLE.

We are a development  stage  biopharmaceutical  company.  Currently,  we have no
products  approved for  commercial  sale and, to date, we have not generated any
revenue. Our ability to generate revenue depends heavily on:

          o    demonstration  in Phase I/IIa and Phase IIb clinical  trials that
               our  two  product  candidates,  Atiprimod  for the  treatment  of
               relapsed  multiple  myeloma and  Annamycin  for the  treatment of
               relapsed acute leukemia, respectively, are safe and effective;

          o    the successful development of our other product candidates; 

          o    our ability to seek and obtain  regulatory  approvals,  including
               with respect to the indications we are seeking;

          o    the successful commercialization of our product candidates; and

          o    market acceptance of our products.

All of  our  existing  product  candidates  will  require  extensive  additional
clinical  evaluation,  regulatory  review,  significant  marketing  efforts  and
substantial  investment  before  they  could  provide us with any  revenue.  For
example,  Atiprimod  for the treatment of multiple  myeloma  entered Phase I/IIa
clinical trials in May 2004 and Annamycin for the treatment of acute leukemia is
expected to enter clinical trials in mid-2005.  Our other product candidates are
in preclinical  development.  As a result, if we do not successfully develop and
commercialize  Atiprimod or Annamycin, we will be unable to generate any revenue
for many years,  if at all. We do not anticipate  that we will generate  revenue
for several years, at the earliest, or that we will achieve profitability for at
least  several years after  generating  material  revenue,  if at all. If we are
unable to generate revenue, we will not become profitable,  and we may be unable
to continue our operations.

WE HAVE INCURRED  SIGNIFICANT LOSSES SINCE INCEPTION AND ANTICIPATE THAT WE WILL
INCUR CONTINUED LOSSES FOR THE FORESEEABLE FUTURE.

As of March 31, 2005 and  December 31, 2004,  we had an  accumulated  deficit of
$35,955,328 and $33,361,197,  respectively. We have incurred losses in each year
since our inception in 1996. We incurred a net loss of $2,594,131  for the three
months ended March 31, 2005 and $7,543,467 and  $13,106,247  for the years ended
December 31, 2004 and 2003, respectively. These losses, among other things, have
had and will continue to have an adverse effect on our stockholders'  equity and
working capital. We expect to incur significant and increasing  operating losses
for the next several years as we expand our research and  development,  continue
our clinical trials of Atiprimod for the treatment of multiple myeloma, initiate
our clinical trials of Annamycin for the treatment of acute  leukemias,  acquire
or license  technologies,  advance our other  product  candidates  into clinical
development,   seek  regulatory  approval  and,  if  we  receive  FDA  approval,
commercialize  our  products.  Because of the numerous  risks and  uncertainties
associated with our product  development  efforts,  we are unable to predict the
extent of any future losses or when we will become profitable,  if at all. If we
are unable to achieve and then maintain  profitability,  the market value of our
common stock will likely decline.


                                       7




WE WILL NEED TO RAISE SUBSTANTIAL ADDITIONAL CAPITAL TO FUND OUR OPERATIONS, AND
OUR  FAILURE TO OBTAIN  FUNDING  WHEN  NEEDED  MAY FORCE US TO DELAY,  REDUCE OR
ELIMINATE OUR PRODUCT DEVELOPMENT PROGRAMS OR COLLABORATION EFFORTS.

Our operations have consumed  substantial  amounts of cash since  inception.  We
expect to continue to spend substantial amounts to:

          o    complete  the  clinical  development  of  our  two  lead  product
               candidates,  Atiprimod for the treatment of multiple  myeloma and
               Annamycin for the treatment of acute leukemias;

          o    continue the development of our other product candidates;

          o    finance our general and administrative expenses;

          o    prepare regulatory  approval  applications and seek approvals for
               Atiprimod and Annamycin and our other product candidates;

          o    license or acquire additional technologies;

          o    launch and  commercialize  our  product  candidates,  if any such
               product candidates receive regulatory approval; and

          o    develop  and  implement   sales,   marketing   and   distribution
               capabilities.

In 2004, our cash used in operations  increased  significantly  over 2003 and we
expect that our cash used in operations will increase significantly for the next
several years. Over the past 12 months, we have spent approximately $4.7 million
or  approximately  $400,000  per  month.  We expect  that our  existing  capital
resources  will be  sufficient to fund our  operations  for at least the next 12
months.  We will be  required  to  raise  additional  capital  to  complete  the
development and commercialization of our current product candidates.  Our future
funding requirements will depend on many factors, including, but not limited to:

          o    the rate of progress  and cost of our  clinical  trials and other
               development activities;

          o    any   future   decisions   we  may  make   about  the  scope  and
               prioritization of the programs we pursue;

          o    the costs of filing,  prosecuting,  defending  and  enforcing any
               patent claims and other intellectual property rights;

          o    the costs and timing of regulatory approval;

          o    the  costs of  establishing  sales,  marketing  and  distribution
               capabilities;

          o    the effect of competing technological and market developments;

          o    the terms and timing of any  collaborative,  licensing  and other
               arrangements that we may establish; and

          o    general market  conditions  for offerings from  biopharmaceutical
               companies.

To date,  our  sources  of cash have been  primarily  limited to the sale of our
equity  securities.  We  cannot  be  certain  that  additional  funding  will be
available on acceptable terms, or at all. To the extent that we raise additional
funds by issuing equity securities,  our stockholders may experience significant
dilution.  Any debt financing,  if available,  may involve restrictive covenants
that  impact  our  ability to conduct  our  business.  If we are unable to raise
additional  capital  when  required  or on  acceptable  terms,  we may  have  to
significantly   delay,   scale  back  or  discontinue  the  development   and/or
commercialization  of one or  more of our  product  candidates.  We also  may be
required to:

          o    seek collaborators for our product candidates at an earlier stage
               than  otherwise  would be  desirable  and on terms  that are less
               favorable than might otherwise be available; and

          o    relinquish,   license   or   otherwise   dispose   of  rights  to
               technologies,  product  candidates  or  products  that  we  would
               otherwise   seek  to  develop  or   commercialize   ourselves  on
               unfavorable terms.


                                       8




IF OUR  AGREEMENTS  WITH ANORMED INC. OR THE  UNIVERSITY OF TEXAS M.D.  ANDERSON
CANCER CENTER TERMINATE, OUR BUSINESS WOULD BE ADVERSELY AFFECTED.

Our business is dependent on rights we have  licensed  from AnorMED Inc. and The
University of Texas M.D. Anderson Cancer Center.  Under the terms of the AnorMED
license  agreement,  we are  obligated  to make a  maintenance  fee  payment  of
$200,000  on  January  1 of each  year  for the term of the  license  agreement.
Pursuant  to the  license  agreement,  failure to pay the  maintenance  fee is a
material  breach  of the  agreement.  We do not  anticipate  failing  to pay the
maintenance fee, however in the event we cannot pay the maintenance fee, AnorMED
may terminate the license  agreement and we would not be able to further develop
and commercialize  Atiprimod which would have an adverse effect on our business.
Under the terms of the The  University  of Texas  M.D.  Anderson  Cancer  Center
license  agreement,  we are  required to make  certain  good faith  expenditures
towards the clinical development of at least one licensed product within the two
year period after March 2005. In addition, at any time after 5 years from August
12, 2004, The University of Texas M.D.  Anderson  Cancer Center has the right to
terminate the license if we fail to provide  evidence  within 90 days of written
notice that we have commercialized or we are actively and effectively attempting
to  commercialize  Annamycin.  If we fail to fulfill these  obligations or other
material  obligations,  The  University  of Texas M.D.  Anderson  Cancer  Center
license  agreement  may be  terminated  and  our  business  would  be  adversely
affected.

CLINICAL  TRIALS  INVOLVE A LENGTHY  AND  EXPENSIVE  PROCESS  WITH AN  UNCERTAIN
OUTCOME,  AND  RESULTS OF EARLIER  STUDIES AND TRIALS MAY NOT BE  PREDICTIVE  OF
FUTURE TRIAL RESULTS.

In order to receive regulatory approval for the commercialization of our product
candidates,  we must conduct,  at our own expense,  extensive clinical trials to
demonstrate safety and efficacy of these product candidates. Clinical testing is
expensive, can take many years to complete and its outcome is uncertain. Failure
can occur at any time during the clinical trial process.

The  results of  preclinical  studies and early  clinical  trials of our product
candidates  do not  necessarily  predict  the  results of  later-stage  clinical
trials.  Product  candidates in later stages of clinical trials may fail to show
the desired safety and efficacy traits despite having progressed through initial
clinical  testing.  The data  collected  from  clinical  trials  of our  product
candidates  may not be  sufficient  to  support  the  submission  of a new  drug
application or to obtain regulatory  approval in the United States or elsewhere.
Because of the  uncertainties  associated  with drug  development and regulatory
approval,  we cannot  determine if or when we will have an approved  product for
commercialization or achieve sales or profits.

DELAYS IN CLINICAL  TESTING COULD RESULT IN INCREASED  COSTS TO US AND DELAY OUR
ABILITY TO GENERATE REVENUE.

While to date there have no delays in our  clinical  trials,  enrollment  in our
Atiprimod Phase I/IIa trial in multiple  myeloma was slower than anticipated due
to limited availability of relapsed multiple myeloma patients. In the future, we
may experience delays in clinical testing of our product  candidates.  We do not
know  whether  planned  clinical  trials  will  begin on time,  will  need to be
redesigned or will be completed on schedule,  if at all.  Clinical trials can be
delayed  for a variety of  reasons,  including  delays in  obtaining  regulatory
approval to commence a trial, in reaching agreement on acceptable clinical trial
terms with prospective sites, in obtaining  institutional  review board approval
to conduct a trial at a prospective site, in recruiting  patients to participate
in a trial or in obtaining sufficient supplies of clinical trial materials. Many
factors affect patient enrollment, including the size of the patient population,
the proximity of patients to clinical sites,  the  eligibility  criteria for the
trial,  competing  clinical  trials and new drugs approved for the conditions we
are  investigating.  Prescribing  physicians will also have to decide to use our
product candidates over existing drugs that have established safety and efficacy
profiles.  Any delays in completing our clinical trials will increase our costs,
slow down our product  development and approval process and delay our ability to
generate revenue.

WE MAY BE REQUIRED TO SUSPEND OR DISCONTINUE  CLINICAL  TRIALS DUE TO UNEXPECTED
SIDE EFFECTS OR OTHER SAFETY RISKS THAT COULD  PRECLUDE  APPROVAL OF OUR PRODUCT
CANDIDATES.

Our clinical  trials may be  suspended at any time for a number of reasons.  For
example,  we may voluntarily  suspend or terminate our clinical trials if at any
time we believe that they  present an  unacceptable  risk to the clinical  trial
patients. In addition,  regulatory agencies may order the temporary or permanent
discontinuation  of our  clinical  trials at any time if they  believe  that the
clinical trials are not being conducted in accordance with applicable regulatory
requirements  or that they present an  unacceptable  safety risk to the clinical
trial patients.

Administering  any product  candidates  to humans may produce  undesirable  side
effects.  These side effects could  interrupt,  delay or halt clinical trials of
our  product  candidates  and  could  result  in  the  FDA or  other  regulatory
authorities  denying further  development or approval of our product  candidates
for any or all  targeted  indications.  Ultimately,  some or all of our  product
candidates may prove to 

                                       9


be unsafe for human use. Moreover,  we could be subject to significant liability
if any  volunteer  or patient  suffers,  or appears  to suffer,  adverse  health
effects as a result of participating in our clinical trials.

IF WE ARE  UNABLE  TO  SATISFY  REGULATORY  REQUIREMENTS,  WE MAY NOT BE ABLE TO
COMMERCIALIZE OUR PRODUCT CANDIDATES.

We need FDA approval  prior to marketing  our product  candidates  in the United
States of America. We commenced in May 2004 a Phase I/IIa trial of Atiprimod for
the treatment of multiple myeloma.  We expect to commence a Phase I/IIa clinical
trial of Annamycin for the treatment of acute leukemias in mid-2005.  If we fail
to obtain FDA  approval to market our product  candidates,  we will be unable to
sell our  product  candidates  in the United  States of America  and we will not
generate any revenue.

This  regulatory  review and approval  process,  which  includes  evaluation  of
preclinical  studies and clinical  trials of a product  candidate as well as the
evaluation  of  our  manufacturing  process  and  our  contract   manufacturers'
facilities,  is lengthy,  expensive and uncertain. To receive approval, we must,
among other things,  demonstrate with substantial  evidence from well-controlled
clinical  trials that the product  candidate is both safe and effective for each
indication  where  approval  is  sought.   Satisfaction  of  these  requirements
typically  takes  several  years and the time  needed to  satisfy  them may vary
substantially,  based on the type,  complexity and novelty of the pharmaceutical
product.  We cannot predict if or when we might submit for regulatory review any
of our product  candidates  currently  under  development.  Any approvals we may
obtain may not cover all of the  clinical  indications  for which we are seeking
approval. Also, an approval might contain significant limitations in the form of
narrow indications, warnings, precautions, or contra-indications with respect to
conditions of use.

The FDA has substantial discretion in the approval process and may either refuse
to file our  application  for  substantive  review or may form the opinion after
review of our data that our application is insufficient to allow approval of our
product candidates. If the FDA does not file or approve our application,  it may
require  that we  conduct  additional  clinical,  preclinical  or  manufacturing
validation   studies  and  submit  that  data  before  it  will  reconsider  our
application.  Depending on the extent of these or any other studies, approval of
any applications  that we submit may be delayed by several years, or may require
us to expend more  resources  than we have  available.  It is also possible that
additional studies, if performed and completed, may not be considered sufficient
by the FDA to make our applications approvable.  If any of these outcomes occur,
we may be forced to abandon our applications for approval,  which might cause us
to cease operations.

We will also be subject to a wide variety of foreign  regulations  governing the
development,  manufacture  and  marketing  of our  products.  Whether or not FDA
approval has been obtained,  approval of a product by the comparable  regulatory
authorities of foreign  countries must still be obtained prior to  manufacturing
or marketing the product in those  countries.  The approval  process varies from
country  to  country  and the time  needed to secure  approval  may be longer or
shorter than that required for FDA approval.  We cannot assure you that clinical
trials  conducted  in one country  will be accepted by other  countries  or that
approval in one country will result in approval in any other country.

IF OUR PRODUCT CANDIDATES ARE UNABLE TO COMPETE EFFECTIVELY WITH MARKETED CANCER
DRUGS TARGETING SIMILAR  INDICATIONS AS OUR PRODUCT  CANDIDATES,  OUR COMMERCIAL
OPPORTUNITY WILL BE REDUCED OR ELIMINATED.

We face competition from established pharmaceutical and biotechnology companies,
as well as from  academic  institutions,  government  agencies  and  private and
public research institutions. Many of our competitors have significantly greater
financial  resources and expertise in research and  development,  manufacturing,
preclinical testing,  conducting clinical trials, obtaining regulatory approvals
and marketing approved products than we do. Smaller or early-stage companies may
also prove to be significant  competitors,  particularly  through  collaborative
arrangements with large,  established companies. Our commercial opportunity will
be reduced or eliminated if our  competitors  develop and  commercialize  cancer
drugs  that are safer,  more  effective,  have  fewer  side  effects or are less
expensive than our product  candidates.  These third parties  compete with us in
recruiting  and  retaining  qualified   scientific  and  management   personnel,
establishing  clinical trial sites and patient registration for clinical trials,
as well as in acquiring  technologies and technology  licenses  complementary to
our programs or advantageous to our business.

We expect that our ability to compete  effectively  will depend upon our ability
to:

          o    successfully and rapidly complete  clinical trials and submit for
               and obtain all requisite regulatory approvals in a cost-effective
               manner;

          o    maintain   a   proprietary   position   for  our   products   and
               manufacturing processes and other related product technology;

          o    attract and retain key personnel;


                                       10



          o    develop relationships with physicians prescribing these products;
               and

          o    build an  adequate  sales and  marketing  infrastructure  for our
               product candidates.

Because  we  will be  competing  against  significantly  larger  companies  with
established track records, we will have to demonstrate to physicians that, based
on  experience,  clinical  data,  side-effect  profiles and other  factors,  our
products are  preferable to existing  cancer drugs.  If we are unable to compete
effectively  in the cancer  drug  market and  differentiate  our  products  from
currently marketed cancer drugs, we may never generate meaningful revenue.

Numerous pharmaceutical and biotechnology companies have developed anthracycline
drugs used to treat acute leukemias  similar to our compound,  Annamycin.  These
compounds include  Adriamycin(R) and Ellence(R) which are marketed by Pfizer and
Cerubidine(R) which is marketed by Boehringer  Ingelheim.  These drugs have been
approved by the FDA and are  currently  being  marketed as opposed to  Annamycin
which is in clinical  development.  Atiprimod,  our drug  candidate for relapsed
multiple  myeloma,  works  through a different  mechanism of action than Velcade
which is  currently  marketed by  Millenium  Pharmaceuticals  and other drugs in
development, such as Celgene Corporation's Revlimid.

WE  CURRENTLY  HAVE NO SALES AND  MARKETING  ORGANIZATION.  IF WE ARE  UNABLE TO
ESTABLISH A DIRECT SALES FORCE IN THE UNITED STATES TO PROMOTE OUR PRODUCTS, THE
COMMERCIAL OPPORTUNITY FOR OUR PRODUCTS MAY BE DIMINISHED.

We currently  have no sales and  marketing  organization.  If any of our product
candidates are approved by the FDA, we intend to market that product directly to
hospitals in the United States of America  through our own sales force.  We will
incur  significant   additional  expenses  and  commit  significant   additional
management  resources  to  establish  this  sales  force.  We may not be able to
establish these capabilities despite these additional expenditures. We will also
have to  compete  with  other  pharmaceutical  and  biotechnology  companies  to
recruit,  hire and train sales and marketing  personnel.  If we elect to rely on
third  parties  to sell our  product  candidates  in the United  States,  we may
receive less revenue than if we sold our products directly.  In addition, we may
have little or no control over the sales efforts of those third parties.  In the
event we are unable to develop our own sales force or  collaborate  with a third
party to sell our product  candidates,  we may not be able to commercialize  our
product  candidates  which  would  negatively  impact our  ability  to  generate
revenue.

WE MAY NEED  OTHERS  TO MARKET  AND  COMMERCIALIZE  OUR  PRODUCT  CANDIDATES  IN
INTERNATIONAL MARKETS.

In the future, if appropriate  regulatory  approvals are obtained,  we intend to
commercialize our product candidates in international markets.  However, we have
not decided how to commercialize our product candidates in those markets. We may
decide to build our own sales force or sell our products  through third parties.
Currently, we do not have any plans to enter international markets. If we decide
to sell our product  candidates in international  markets through a third party,
we may not be able to enter into any marketing  arrangements  on favorable terms
or at all. In  addition,  these  arrangements  could  result in lower  levels of
income to us than if we marketed our product candidates  entirely on our own. If
we are unable to enter into a marketing  arrangement for our product  candidates
in  international   markets,  we  may  not  be  able  to  develop  an  effective
international  sales  force to  successfully  commercialize  those  products  in
international  markets. If we fail to enter into marketing  arrangements for our
products and are unable to develop an effective  international  sales force, our
ability to generate revenue would be limited.


IF OUR RELATIONSHIP WITH OUR CONTRACT MANUFACTURER FOR ANNAMYCIN TERMINATES,  OR
THEIR  FACILITIES  ARE  DAMAGED  OR  DESTROYED,  WE MAY BE UNABLE TO  DEVELOP OR
COMMERCIALIZE ANNAMYCIN.


Currently,  Antibioticos  S.p.A.  is our  sole  supplier  of  Annamycin  for our
clinical trials.  If our relationship  with this contract  manufacturer,  or any
other  contract  manufacturer  we  might  use,  terminates  or if any  of  their
facilities  are damaged for any reason,  including  fire,  flood,  earthquake or
other similar event,  we may be unable to obtain supply of Annamycin.  If any of
these events were to occur,  we may need to find  alternative  manufacturers  or
manufacturing  facilities.   The  number  of  contract  manufacturers  with  the
expertise, required regulatory approvals and facilities to manufacture Annamycin
on a commercial  scale is  extremely  limited,  and it would take a  significant
amount of time to arrange for alternative manufacturers. If we need to change to
other commercial  manufacturers,  the FDA and comparable foreign regulators must
approve these  manufacturers'  facilities and processes  prior to our use, which
would require new testing and compliance  inspections.  In addition,  we may not
have  the  intellectual  property  rights,  or may  have to  share  intellectual
property rights, to any improvements in the current  manufacturing  processes or
any new manufacturing processes for Annamycin.  Any of these factors could cause
us to  delay  or  suspend  clinical  trials,  regulatory  submissions,  required
approvals or  commercialization  of Annamycin,  entail  higher costs,  and could
result in our being unable to commercialize Annamycin 


                                       11


successfully.  Furthermore,  if our contract  manufacturers  fail to deliver the
required  commercial  quantities of bulk drug substance or finished product on a
timely basis and at commercially  reasonable  prices, and we were unable to find
one or more replacement  manufacturers  capable of production at a substantially
equivalent  cost,  in  substantially  equivalent  volumes and quality,  and on a
timely  basis,  we would  likely be unable to meet demand for  Annamycin  and we
would lose potential revenue.

IF THE FDA DOES NOT APPROVE OUR CONTRACT  MANUFACTURERS'  FACILITIES,  WE MAY BE
UNABLE TO DEVELOP OR COMMERCIALIZE OUR PRODUCT CANDIDATES.

We rely  on  third-party  contract  manufacturers  to  manufacture  our  product
candidates,  and  currently  have no  plans  to  develop  our own  manufacturing
facility.  The facilities used by our contract  manufacturers to manufacture our
product  candidates  must be  approved  by the FDA.  If the FDA does not approve
these  facilities  for  the  manufacture  of our  product,  we may  need to fund
additional  modifications  to  our  manufacturing  process,  conduct  additional
validation studies, or find alternative manufacturing  facilities,  any of which
would result in significant cost to us as well as a delay of up to several years
in  obtaining  approval  for and  manufacturing  of our product  candidates.  In
addition,  our  contract  manufacturers  will be  subject  to  ongoing  periodic
unannounced   inspection  by  the  FDA  and  corresponding  state  agencies  for
compliance with good manufacturing practices regulations,  or cGMPs, and similar
foreign  standards.  These regulations  cover all aspects of the  manufacturing,
testing,  quality control and record keeping relating to our product candidates.
We do not have control over our contract  manufacturers'  compliance  with these
regulations and standards.  Failure by our contract manufacturers to comply with
applicable  regulations could result in sanctions being imposed on us, including
fines, injunctions,  civil penalties,  failure of the government to grant market
approval of drugs,  delays,  suspension or withdrawals  of approvals,  operating
restrictions and criminal  prosecutions,  any of which could  significantly  and
adversely affect our business. In addition, we have no control over our contract
manufacturers'  ability to maintain adequate quality control,  quality assurance
and qualified personnel. Failure by our contract manufacturers to comply with or
maintain any of these standards  could  adversely  affect the development of our
product candidates and our business.

IF PRODUCT LIABILITY LAWSUITS ARE SUCCESSFULLY  BROUGHT AGAINST US, WE MAY INCUR
SUBSTANTIAL  LIABILITIES AND MAY BE REQUIRED TO LIMIT  COMMERCIALIZATION  OF OUR
PRODUCT CANDIDATES.

We face an inherent risk of product liability lawsuits related to the testing of
our  product  candidates,  and  will  face an even  greater  risk if we sell our
product candidates commercially.  Currently, we are not aware of any anticipated
product liability claims with respect to our product candidates.  In the future,
an  individual  may bring a  liability  claim  against us if one of our  product
candidates  causes,  or merely appears to have caused,  an injury.  If we cannot
successfully  defend ourselves against the product liability claim, we may incur
substantial  liabilities.  Regardless  of merit or eventual  outcome,  liability
claims may result in:

          o    decreased demand for our product candidates;

          o    injury to our reputation;

          o    withdrawal of clinical trial participants;

          o    costs of related litigation;

          o    substantial monetary awards to patients;

          o    product recalls;

          o    loss of revenue; and

          o    the inability to commercialize our product candidates.

We have "clinical trial" liability  insurance with a $2,000,000 annual aggregate
limit for up to 40  patients  participating  in our  Atiprimod  and  prospective
Annamycin clinical trials. We intend to expand our insurance coverage to include
the sale of  commercial  products if  marketing  approval  is  obtained  for our
product  candidates.  Our current insurance  coverage may prove  insufficient to
cover any  liability  claims  brought  against us. In  addition,  because of the
increasing costs of insurance coverage, we may not be able to maintain insurance
coverage at a reasonable cost or obtain insurance coverage that will be adequate
to satisfy any liability that may arise.

EVEN IF WE RECEIVE REGULATORY  APPROVAL FOR OUR PRODUCT  CANDIDATES,  WE WILL BE
SUBJECT TO ONGOING SIGNIFICANT REGULATORY OBLIGATIONS AND OVERSIGHT.


                                       12



If we receive regulatory  approval to sell our product  candidates,  the FDA and
foreign   regulatory   authorities   may,   nevertheless,   impose   significant
restrictions  on the  indicated  uses or marketing of such  products,  or impose
ongoing  requirements  for  post-approval  studies.   Following  any  regulatory
approval of our product candidates,  we will be subject to continuing regulatory
obligations,   such   as   safety   reporting   requirements,   and   additional
post-marketing obligations,  including regulatory oversight of the promotion and
marketing of our  products.  If we become aware of previously  unknown  problems
with  any  of  our  product   candidates   here  or  overseas  or  our  contract
manufacturers'  facilities,  a regulatory agency may impose  restrictions on our
products,  our  contract  manufacturers  or on  us,  including  requiring  us to
reformulate our products,  conduct additional  clinical trials,  make changes in
the labeling of our products, implement changes to or obtain re-approvals of our
contract  manufacturers'  facilities or withdraw the product from the market. In
addition,  we may  experience  a  significant  drop in the sales of the affected
products,  our  reputation in the  marketplace  may suffer and we may become the
target of lawsuits, including class action suits. Moreover, if we fail to comply
with applicable regulatory requirements,  we may be subject to fines, suspension
or withdrawal of regulatory  approvals,  product  recalls,  seizure of products,
operating restrictions and criminal prosecution.  Any of these events could harm
or prevent sales of the affected  products or could  substantially  increase the
costs and expenses of commercializing and marketing these products.

WE RELY ON THIRD PARTIES TO CONDUCT OUR CLINICAL TRIALS.  IF THESE THIRD PARTIES
DO NOT  SUCCESSFULLY  CARRY  OUT  THEIR  CONTRACTUAL  DUTIES  OR  MEET  EXPECTED
DEADLINES,  WE MAY NOT BE ABLE TO SEEK  OR  OBTAIN  REGULATORY  APPROVAL  FOR OR
COMMERCIALIZE OUR PRODUCT CANDIDATES.

We have agreements with third-party contract research organizations, or CROs, to
provide monitors and to manage data for our clinical  programs.  We and our CROs
are  required  to  comply  with  current  Good  Clinical  Practices,   or  GCPs,
regulations  and  guidelines  enforced  by the FDA for  all of our  products  in
clinical  development.  The FDA enforces GCPs through  periodic  inspections  of
trial sponsors, principal investigators and trial sites. In the future, if we or
our CROs fail to comply with applicable GCPs, the clinical data generated in our
clinical  trials may be deemed  unreliable and the FDA may require us to perform
additional  clinical  trials before  approving our  marketing  applications.  We
cannot assure you that, upon inspection,  the FDA will determine that any of our
clinical  trials for  products in  clinical  development  comply  with GCPs.  In
addition, our clinical trials must be conducted with product produced under cGMP
regulations,  and will require a large number of test  subjects.  Our failure to
comply with these  regulations may require us to repeat clinical  trials,  which
would delay the regulatory approval process.

If any of our relationships with these third-party CROs terminate, we may not be
able  to  enter  into  arrangements  with  alternative  CROs.  If  CROs  do  not
successfully  carry out their contractual duties or obligations or meet expected
deadlines,  if they need to be  replaced,  or if the  quality or accuracy of the
clinical  data they  obtain is  compromised  due to the failure to adhere to our
clinical protocols,  regulatory  requirements or for other reasons, our clinical
trials may be extended,  delayed or terminated, and we may not be able to obtain
regulatory approval for or successfully commercialize our product candidates. As
a result,  our financial  results and the  commercial  prospects for our product
candidates  would be  harmed,  our costs  could  increase,  and our  ability  to
generate revenue could be delayed.

IF WE FAIL TO ATTRACT AND KEEP SENIOR  MANAGEMENT AND KEY SCIENTIFIC  PERSONNEL,
WE MAY BE UNABLE TO  SUCCESSFULLY  DEVELOP OUR PRODUCT  CANDIDATES,  CONDUCT OUR
CLINICAL TRIALS AND COMMERCIALIZE OUR PRODUCT CANDIDATES.

Our success  depends in part on our  continued  ability to  attract,  retain and
motivate highly qualified  management,  clinical and scientific personnel and on
our  ability  to develop  and  maintain  important  relationships  with  leading
academic institutions,  clinicians and scientists.  We are highly dependent upon
our senior  management and scientific  staff,  particularly  Gary S. Jacob,  our
Chief Executive Officer,  and Donald Picker, our Executive Vice President,  R&D.
The loss of  services  of Dr.  Jacob,  Dr.  Picker  or one or more of our  other
members of senior management could delay or prevent the successful completion of
our planned clinical trials or the commercialization of our product candidates.

The competition for qualified personnel in the biotechnology and pharmaceuticals
field is intense.  We will need to hire  additional  personnel  as we expand our
clinical  development and commercial  activities.  We may not be able to attract
and retain quality  personnel on acceptable terms given the competition for such
personnel among  biotechnology,  pharmaceutical  and other companies.  We do not
carry "key person" insurance covering any members of our senior management.

IF WE FAIL TO ACQUIRE AND DEVELOP OTHER PRODUCTS OR PRODUCT  CANDIDATES,  WE MAY
BE UNABLE TO GROW OUR BUSINESS.

To date,  we have  in-licensed  or  acquired  the rights to each of our  product
candidates.  As part of our growth  strategy,  in  addition  to  developing  our
current product candidates,  we intend to license or acquire additional products
and product  candidates for development and  commercialization.  Because we have
limited internal research capabilities, we are dependent upon pharmaceutical and
biotechnology companies and other researchers to sell or license products to us.
The success of this  strategy  depends upon our 

                                       13


ability  to  identify,  select  and  acquire  the right  pharmaceutical  product
candidates  and  products.  We currently do not have any  intentions  to acquire
another company.

Any product candidate we license or acquire may require  additional  development
efforts prior to  commercial  sale,  including  extensive  clinical  testing and
approval by the FDA and applicable foreign regulatory  authorities.  All product
candidates are prone to the risks of failure inherent in pharmaceutical  product
development,  including the possibility  that the product  candidate will not be
shown  to  be  sufficiently  safe  and  effective  for  approval  by  regulatory
authorities. In addition, we cannot assure you that any products that we license
or acquire  that are approved  will be  manufactured  or produced  economically,
successfully commercialized or widely accepted in the marketplace.

Proposing,   negotiating  and   implementing  an  economically   viable  product
acquisition  or license  is a lengthy  and  complex  process.  Other  companies,
including  those  with  substantially  greater  financial,  marketing  and sales
resources,  may  compete  with us for the  acquisition  or  license  of  product
candidates and approved  products.  We may not be able to acquire or license the
rights to additional  product  candidates and approved products on terms that we
find acceptable, or at all.

WE  MAY  UNDERTAKE  ACQUISITIONS  IN  THE  FUTURE,  AND  ANY  DIFFICULTIES  FROM
INTEGRATING  THESE  ACQUISITIONS  COULD DAMAGE OUR ABILITY TO ATTAIN OR MAINTAIN
PROFITABILITY.

We may  acquire  additional  businesses,  products  or product  candidates  that
complement  or augment our existing  business.  Integrating  any newly  acquired
business or product could be expensive and time-consuming. We may not be able to
integrate any acquired business or product  successfully or operate any acquired
business  profitably.  Moreover,  we many need to raise additional funds through
public or  private  debt or equity  financing  to make  acquisitions,  which may
result in dilution to stockholders  and the incurrence of indebtedness  that may
include restrictive covenants.

WE WILL NEED TO INCREASE  THE SIZE OF OUR  ORGANIZATION,  AND WE MAY  EXPERIENCE
DIFFICULTIES IN MANAGING GROWTH.

We are a small company with 5 full-time and 2 part-time  employees as of June 1,
2005. To continue our clinical trials and commercialize our product  candidates,
we will need to expand our employee base for managerial,  operational, financial
and   other   resources.   Future   growth   will   impose   significant   added
responsibilities  on  members of  management,  including  the need to  identify,
recruit,  maintain and integrate additional  employees.  Over the next 12 months
depending  on the  progress  of our  planned  clinical  trials,  we  plan to add
approximately  four  employees  who we expect  to  assist  us with our  clinical
programs.  Our future financial performance and our ability to commercialize our
product  candidates  and to compete  effectively  will depend,  in part,  on our
ability to manage any future  growth  effectively.  To that end, we must be able
to:

          o    manage our development efforts effectively;

          o    manage our clinical trials effectively;

          o    integrate additional  management,  administrative,  manufacturing
               and sales and marketing personnel;

          o    maintain  sufficient  administrative,  accounting  and management
               information systems and controls; and

          o    hire and train additional qualified personnel.

We may not be able to accomplish  these tasks, and our failure to accomplish any
of them could harm our financial results.

REIMBURSEMENT  MAY NOT BE  AVAILABLE  FOR OUR  PRODUCT  CANDIDATES,  WHICH COULD
DIMINISH OUR SALES.

Market   acceptance   and  sales  of  our  product   candidates  may  depend  on
reimbursement  policies  and health  care reform  measures.  The levels at which
government  authorities and third-party  payors, such as private health insurers
and health maintenance organizations,  reimburse patients for the price they pay
for our  products  could  affect  whether  we are  able to  commercialize  these
products.  We cannot be sure that  reimbursement  will be  available  for any of
these  products.  Also,  we cannot be sure that  reimbursement  amounts will not
reduce the demand  for,  or the price of, our  products.  We have not  commenced
efforts to have our product  candidates  reimbursed by government or third party
payors.  If  reimbursement  is not  available  or is  available  only to limited
levels, we may not be able to commercialize our products.


                                       14


In recent years,  officials  have made  numerous  proposals to change the health
care system in the United States.  These proposals  include  measures that would
limit or prohibit payments for certain medical treatments or subject the pricing
of  drugs  to  government  control.  In  addition,  in many  foreign  countries,
particularly  the countries of the European  Union,  the pricing of prescription
drugs is subject to government control. If our products are or become subject to
government regulation that limits or prohibits payment for our products, or that
subject the price of our products to governmental control, we may not be able to
generate revenue, attain profitability or commercialize our products.

As a result of legislative  proposals and the trend towards  managed health care
in the United States,  third-party payers are increasingly attempting to contain
health care costs by limiting  both coverage and the level of  reimbursement  of
new drugs.  They may also  refuse to provide  any  coverage  of uses of approved
products for medical  indications other than those for which the FDA has granted
market approvals. As a result,  significant uncertainty exists as to whether and
how  much  third-party   payers  will  reimburse   patients  for  their  use  of
newly-approved drugs, which in turn will put pressure on the pricing of drugs.

LEGISLATIVE OR REGULATORY REFORM OF THE HEALTHCARE SYSTEM MAY AFFECT OUR ABILITY
TO SELL OUR PRODUCTS PROFITABLY.

In both the United States and certain foreign  jurisdictions,  there have been a
number of legislative and regulatory  proposals to change the healthcare  system
in ways that could impact upon our ability to sell our products  profitably.  In
recent  years,  new  legislation  has been  proposed in the United States at the
federal  and state  levels that would  effect  major  changes in the  healthcare
system, either nationally or at the state level.

These proposals have included  prescription  drug benefit proposals for Medicare
beneficiaries  introduced in Congress.  Legislation creating a prescription drug
benefit and making certain changes in Medicaid  reimbursement  has recently been
enacted by Congress and signed by the President. Given this legislation's recent
enactment,  it is still too early to determine its impact on the  pharmaceutical
industry and our business.  Further federal and state proposals are likely.  The
potential for adoption of these proposals  affects or will affect our ability to
raise  capital,  obtain  additional  collaborators  and market our products.  We
expect  to  experience  pricing  pressures  in  connection  with the sale of our
products due to the trend toward managed  health care, the increasing  influence
of health maintenance  organizations and additional legislative  proposals.  Our
results of operations could be adversely affected by future healthcare reforms.

RISKS RELATED TO OUR INTELLECTUAL PROPERTY

IT IS DIFFICULT AND COSTLY TO PROTECT OUR PROPRIETARY  RIGHTS, AND WE MAY NOT BE
ABLE TO ENSURE THEIR PROTECTION.

Our commercial  success will depend in part on obtaining and maintaining  patent
protection  and trade  secret  protection  of our  product  candidates,  and the
methods  used to  manufacture  them,  as well as  successfully  defending  these
patents  against  third-party  challenges.  We will only be able to protect  our
product candidates from unauthorized making, using, selling, offering to sell or
importation  by third  parties to the extent that we have rights under valid and
enforceable patents or trade secrets that cover these activities.

As of June 1, 2005,  we own 4 issued  United  States  patents and have  licensed
rights to 8 issued United States patents and 78 issued foreign patents, and to 3
pending  United  States  patent  applications  and  39  pending  foreign  patent
applications.  We do not and  have  not had  any  control  over  the  filing  or
prosecution  of these  patents or patent  applications.  We may file  additional
patent applications and extensions.  Our issued United States patents we own and
license  primarily are composition of matter and formulation  patents related to
Atiprimod  and  liposomal  Annamycin.  Our  composition  of matter  patents  for
liposomal  Annamycin and Atiprimod  expire in 2008 and 2009,  respectively.  Our
formulation  patents for liposomal  Annamycin  and Atiprimod  expire in 2019 and
2018, respectively.

The patent positions of pharmaceutical and biotechnology companies can be highly
uncertain and involve  complex legal and factual  questions for which  important
legal principles remain  unresolved.  No consistent policy regarding the breadth
of claims  allowed in  biotechnology  patents  has emerged to date in the United
States.  The  biotechnology  patent situation  outside the United States is even
more  uncertain.  Changes  in either the patent  laws or in  interpretations  of
patent laws in the United  States and other  countries may diminish the value of
our intellectual property.  Accordingly, we cannot predict the breadth of claims
that may be allowed  or  enforced  in our  licensed  patents  or in  third-party
patents.

The degree of future protection for our proprietary  rights is uncertain because
legal means afford only limited  protection and may not  adequately  protect our
rights or permit us to gain or keep our competitive advantage. For example:

          o    others may be able to make  compounds that are  competitive  with
               our product  candidates but that are not covered by the claims of
               our licensed patents,  or for which we are not licensed under our
               license agreements;



                                       15


          o    we or our  licensors  might  not have  been the first to make the
               inventions  covered  by our  pending  patent  application  or the
               pending patent applications and issued patents of our licensors;

          o    we or our licensors  might not have been the first to file patent
               applications for these inventions;

          o    others  may   independently   develop   similar  or   alternative
               technologies or duplicate any of our technologies;

          o    it is possible that our pending patent application or one or more
               of the pending  patent  applications  of our  licensors  will not
               result in issued patents;

          o    the issued  patents of our  licensors may not provide us with any
               competitive  advantages,  or may be held invalid or unenforceable
               as a result of legal challenges by third parties;

          o    we may not develop additional  proprietary  technologies that are
               patentable; or

          o    the patents of others may have an adverse effect on our business.

We also may rely on trade secrets to protect our technology, especially where we
do not believe patent  protection is appropriate or obtainable.  However,  trade
secrets are difficult to protect. While we use reasonable efforts to protect our
trade  secrets,  our employees,  consultants,  contractors,  outside  scientific
collaborators and other advisors may  unintentionally  or willfully disclose our
information  to  competitors.  Enforcing  a claim that a third  party  illegally
obtained and is using our trade secrets is expensive and time consuming, and the
outcome is  unpredictable.  In addition,  courts  outside the United  States are
sometimes less willing to protect trade secrets.  Moreover,  our competitors may
independently develop equivalent knowledge, methods and know-how.

WE MAY INCUR  SUBSTANTIAL  COSTS AS A RESULT OF LITIGATION OR OTHER  PROCEEDINGS
RELATING TO PATENT AND OTHER  INTELLECTUAL  PROPERTY RIGHTS AND WE MAY BE UNABLE
TO PROTECT OUR RIGHTS TO, OR USE, OUR TECHNOLOGY.

If we  choose to go to court to stop  someone  else  from  using the  inventions
claimed in our licensed patents, that individual or company has the right to ask
the court to rule that these  patents are invalid  and/or should not be enforced
against that third party.  These  lawsuits are  expensive and would consume time
and other resources even if we were  successful in stopping the  infringement of
these  patents.  In  addition,  there is a risk that the court will  decide that
these  patents are not valid and that we do not have the right to stop the other
party  from  using  the  inventions.  There is also the risk  that,  even if the
validity  of these  patents is upheld,  the court will  refuse to stop the other
party on the ground  that such other  party's  activities  do not  infringe  our
rights to these patents.

Furthermore, a third party may claim that we are using inventions covered by the
third party's  patent rights and may go to court to stop us from engaging in our
normal  operations  and  activities,  including  making or selling  our  product
candidates. These lawsuits are costly and could affect our results of operations
and divert the attention of managerial and technical personnel.  There is a risk
that a court would decide that we are infringing  the third party's  patents and
would order us to stop the activities covered by the patents. In addition, there
is a risk that a court will order us to pay the other  party  damages for having
violated the other party's patents.  The  biotechnology  industry has produced a
proliferation of patents,  and it is not always clear to industry  participants,
including  us, which  patents cover various types of products or methods of use.
The  coverage of patents is subject to  interpretation  by the  courts,  and the
interpretation is not always uniform. If we are sued for patent infringement, we
would  need to  demonstrate  that our  products  or methods of use either do not
infringe the patent claims of the relevant  patent and/or that the patent claims
are  invalid,  and we  may  not be  able  to do  this.  Proving  invalidity,  in
particular,  is  difficult  since it requires a showing of clear and  convincing
evidence to overcome the presumption of validity enjoyed by issued patents.

Because  some  patent  applications  in the  United  States  of  America  may be
maintained in secrecy until the patents are issued,  because patent applications
in the United States of America and many foreign jurisdictions are typically not
published  until eighteen months after filing,  and because  publications in the
scientific literature often lag behind actual discoveries,  we cannot be certain
that others have not filed patent  applications  for  technology  covered by our
licensors' issued patents or our pending  applications or our licensors' pending
applications  or  that  we or  our  licensors  were  the  first  to  invent  the
technology.  Our competitors may have filed, and may in the future file,  patent
applications  covering  technology  similar to ours. Any such patent application
may have  priority  over our or our  licensors'  patent  applications  and could
further   require  us  to  obtain  rights  to  issued   patents   covering  such
technologies.  If another party has filed a United States patent  application on
inventions  similar  to ours,  we may  have to  participate  in an  interference
proceeding  declared  by the  United  States  Patent  and  Trademark  Office  to
determine  priority  of  invention  in the  United  States.  The  costs of these
proceedings could be substantial,  and it is possible that such efforts would be
unsuccessful,  resulting in a loss of our United  States  patent  position  with
respect to such inventions.

                                       16


Some of our  competitors  may be able to  sustain  the costs of  complex  patent
litigation more effectively than we can because they have substantially  greater
resources.  In addition,  any  uncertainties  resulting  from the initiation and
continuation  of any  litigation  could  have a material  adverse  effect on our
ability to raise the funds necessary to continue our operations.

RISKS RELATED TO OUR COMMON STOCK

MARKET VOLATILITY MAY AFFECT OUR STOCK PRICE AND THE VALUE OF YOUR INVESTMENT.

The market prices for securities of biopharmaceutical  companies in general have
been highly volatile and may continue to be highly  volatile in the future.  The
following factors,  in addition to other risk factors described in this section,
may have a significant impact on the market price of our common stock:

          o    announcements of technological  innovations or new products by us
               or our competitors;

          o    announcement  of FDA  approval  or  non-approval  of our  product
               candidates or delays in the FDA review process;

          o    actions taken by regulatory  agencies with respect to our product
               candidates,  clinical trials,  manufacturing process or sales and
               marketing activities;

          o    regulatory  developments  in the  United  States of  America  and
               foreign countries;

          o    the success of our development efforts and clinical trials;

          o    the  success of our efforts to acquire or  in-license  additional
               products or product candidates;

          o    any  intellectual  property  infringement  action,  or any  other
               litigation, involving us;

          o    announcements concerning our competitors, or the biotechnology or
               biopharmaceutical industries in general;

          o    actual or anticipated fluctuations in our operating results;

          o    changes in financial  estimates or  recommendations by securities
               analysts;

          o    sales of large blocks of our common stock;

          o    sales of our common stock by our  executive  officers,  directors
               and significant stockholders; and

          o    the loss of any of our key scientific or management personnel.

The  occurrence  of one or more of these  factors  may cause our stock  price to
decline, and you may not be able to resell your shares at or above the price you
paid for your shares. In addition, the stock markets in general, and the markets
for biotechnology and biopharmaceutical  stocks in particular,  have experienced
extreme volatility that has often been unrelated to the operating performance of
particular  companies.  These broad market fluctuations may adversely affect the
trading price of our common stock.

WE ARE AT RISK OF SECURITIES CLASS ACTION LITIGATION.

In the past, securities class action litigation has often been brought against a
company following a decline in the market price of its securities.  This risk is
especially relevant for us because biotechnology and biopharmaceutical companies
have experienced significant stock price volatility in recent years. If we faced
such  litigation,  it could  result  in  substantial  costs and a  diversion  of
management's attention and resources, which could harm our business.

WE HAVE NOT PAID  CASH  DIVIDENDS  IN THE  PAST  AND DO NOT  EXPECT  TO PAY CASH
DIVIDENDS IN THE FUTURE. ANY RETURN ON INVESTMENT MAY BE LIMITED TO THE VALUE OF
OUR STOCK.

We have never paid cash dividends on our stock and do not anticipate paying cash
dividends on our stock in the foreseeable  future. The payment of cash dividends
on our stock will depend on our earnings, financial condition and other business
and economic  factors  affecting  us at such time as the board of directors  may
consider  relevant.  If we do not pay  cash  dividends,  our  stock  may be less
valuable  because a return on your investment will only occur if our stock price
appreciates.


                                       17


                           FORWARD-LOOKING STATEMENTS

The Private Securities Litigation Reform Act of 1995 (the "Act") provides a safe
harbor for  forward-looking  statements made by us or on our behalf.  We and our
representatives  may from time to time make written or oral  statements that are
"forward-looking,"  including  statements contained in this prospectus and other
filings with the Securities and Exchange Commission, reports to our stockholders
and  news  releases.  All  statements  that  express  expectations,   estimates,
forecasts or projections are  forward-looking  statements  within the meaning of
the  Act.  In  addition,  other  written  or oral  statements  which  constitute
forward-looking  statements  may be made by us or on our  behalf.  Words such as
"expects,"  "anticipates," "intends," "plans," "believes," "seeks," "estimates,"
"projects,"  "forecasts," "may," "should,"  variations of such words and similar
expressions  are intended to identify  such  forward-looking  statements.  These
statements  are  not  guarantees  of  future   performance  and  involve  risks,
uncertainties and assumptions which are difficult to predict.  Therefore, actual
outcomes and results may differ  materially from what is expressed or forecasted
in or suggested by such forward-looking  statements.  We undertake no obligation
to update publicly any  forward-looking  statements,  whether as a result of new
information,  future events or otherwise.  Among the important  factors on which
such  statements  are based are  assumptions  concerning our ability to complete
ongoing clinical trials,  results of our clinical trials, the timing of approval
of our products by the United States Food and Drug  Administration,  our ability
to obtain additional financing, our ability to attract and retain key employees,
our  ability  to  protect  intellectual  property,  and our  ability to adapt to
economic, political and regulatory conditions affecting the healthcare industry.

                                 USE OF PROCEEDS

We will not  receive  any of the  proceeds  from the resale of the  shares.  All
proceeds  from the sale of these  shares will be solely for the  accounts of the
selling stockholders.




                                       18



                              SELLING STOCKHOLDERS

On March 9,  2005,  we sold and  issued  1,985,791  shares of common  stock in a
private  placement.  This prospectus only covers the 1,985,791  shares of common
stock  issued in the  private  placement.  The  following  table  lists  certain
information  with  respect to the  selling  stockholders  as  follows:  (i) each
selling  stockholder's  name,  (ii) the number of  outstanding  shares of common
stock  beneficially  owned by the selling  stockholders  prior to this offering;
(iii) the number of shares being  offered in this  offering,  (iv) the number of
shares of common  stock to be  beneficially  owned by each  selling  stockholder
after the completion of this offering  assuming the sale of all of the shares of
the common stock offered by each selling stockholder;  and (v) if one percent or
more, the percentage of  outstanding  shares of common stock to be  beneficially
owned by each selling stockholder after the completion of this offering assuming
the  sale  of all of  the  shares  of  common  stock  offered  by  each  selling
stockholder.  Except as noted,  none of the  selling  stockholders  have had any
position,  office,  or  other  material  relationship  with  us or  any  of  our
predecessors or affiliates within the past three years.

The selling stockholders may sell all, or none of their shares in this offering.
See "Plan of Distribution."





                                                                                           After the Offering
                                                                                           ------------------

Selling Stockholder                        Number of Shares        Number of Shares  Number of Shares     Percent of Shares
-------------------                        Beneficially Owned      Being Offered     Beneficially Owned   Beneficially
                                           Prior to the Offering   ----------------  ------------------   Owned
                                           ---------------------                                          -----
                                                                                                  
The Pharmaceutical/Medical
Technology Fund, L.P.(1)                     694,444 (2)           250,000             444,444            1.4

Atlas Equity I, Ltd.(3)                      700,000               500,000             200,000            *

Orion Biomedical Fund, L..P (4)              905,572               540,461             365,111            1.2

Orion Biomedical Offshore Fund, L..P(4)      196,767               117,434              79,333            *

Alexandra Global Master Fund Ltd.(5)         750,000               500,000             250,000            *

Panetta Partners, Ltd. (6)                 2,101,237                25,000           2,076,237            6.6

Gary S. Jacob (7)                            274,745 (8)            16,448             258,297            *

Christoph Bruening (9)                       460,699 (10)           20,000             440,699            1.4

Daniel D'Agostino (11)                        16,448                16,448                  --            --



*   less than 1%.

(1) Dr.  Douglas  Murphy-Chutorian  may be deemed to have  dispositive  power or
investment  control  over  the  shares  of  common  stock  held  by the  selling
stockholder.

(2)  Includes  444,444  shares of common  stock owned by  Greenberg  Health Care
Partners LLC, a related entity.

(3) Dmitri Balyasny and Jacob Gottlieb may be deemed to share  dispositive power
or  investment  control  over the  shares of common  stock  held by the  selling
stockholder.

(4) Lindsay A. Rosenwald,  M.D. is the managing  member of Orion  Biomedical GP,
LLC,  the general  partner of Orion  Biomedical  Fund,  LP and Orion  Biomedical
Offshore  Fund,  LP, and may be deemed to have  dispositive  power or investment
control over the shares of common stock held by the selling stockholder.

(5) Mikhail A. Filimonov and Dimitri  Sogoloff are managing members of Alexandra
Investment  Management,  LLC, the investment advisor to the selling stockholder,
and may be deemed to share  dispositive  power or  investment  control  over the
shares of common stock held by the selling stockholder.

(6) Gabriele M. Cerrone,  our Chairman,  is the sole general  partner of Panetta
and in  such  capacity  only  exercises  voting  and  dispositive  control  over
securities  owned by Panetta.  As such,  Mr.  Cerrone may be deemed,  solely for
purposes of Section 13(d) of the Securities  Exchange Act of 1934 as amended, to
"beneficially"  own  securities  in which he has no  pecuniary  interest  and he
therefore disclaims such beneficial interest.

(7) Mr. Jacob is our Chief Executive Officer

(8) Includes  150,000  shares of common stock  issuable  upon  exercise of stock
options.

                                       19


(9) Mr. Bruening is a director of our company.

(10)  Includes  25,000  shares of common stock  issuable  upon exercise of stock
options.

(11) Mr. D'Agostino is a consultant to our company.

                              PLAN OF DISTRIBUTION

The selling  stockholders,  or their pledgees,  donees,  transferees,  or any of
their  successors  in interest  selling  shares  received  from a named  selling
stockholder  as a  gift,  partnership  distribution  or  other  non-sale-related
transfer  after  the  date  of this  prospectus  (all  of  whom  may be  selling
stockholders)  may sell the common stock offered by this prospectus from time to
time on any stock exchange or automated  interdealer  quotation  system on which
the   common   stock  is  listed  or  quoted  at  the  time  of  sale,   in  the
over-the-counter  market, in privately negotiated  transactions or otherwise, at
fixed prices that may be changed,  at market  prices  prevailing  at the time of
sale,  at prices  related to  prevailing  market  prices or at prices  otherwise
negotiated. The selling stockholders may sell the common stock by one or more of
the following methods, without limitation:

          o    Block  trades in which the  broker  or  dealer  so  engaged  will
               attempt to sell the common  stock as agent but may  position  and
               resell a portion  of the block as  principal  to  facilitate  the
               transaction;

          o    An  exchange  distribution  in  accordance  with the rules of any
               stock exchange on which the common stock is listed;

          o    Ordinary  brokerage  transactions  and  transactions in which the
               broker solicits purchases;

          o    Privately negotiated transactions;

          o    In connection with short sales of company shares;

          o    Through  the   distribution   of  common  stock  by  any  selling
               stockholder to its partners, members or stockholders;

          o    By pledge to secure debts of other obligations;

          o    In connection with the writing of non-traded and  exchange-traded
               call options,  in hedge  transactions  and in settlement of other
               transactions in standardized or over-the-counter options;

          o    Purchases  by a  broker-dealer  as  principal  and  resale by the
               broker-dealer for its account; or

          o    In a combination of any of the above.

These transactions may include crosses, which are transactions in which the same
broker acts as an agent on both sides of the trade. The selling stockholders may
also  transfer the common stock by gift. We do not know of any  arrangements  by
the selling stockholders for the sale of any of the common stock.

The selling  stockholders  may engage  brokers and  dealers,  and any brokers or
dealers may arrange for other  brokers or dealers to  participate  in  effecting
sales of the common stock. These brokers or dealers may act as principals, or as
an agent of a  selling  stockholder.  Broker-dealers  may  agree  with a selling
stockholder to sell a specified  number of the stocks at a stipulated  price per
share. If the broker-dealer is unable to sell common stock acting as agent for a
selling  stockholder,  it may  purchase as  principal  any unsold  shares at the
stipulated  price.  Broker-dealers  who acquire  common stock as principals  may
thereafter  resell the  shares  from time to time in  transactions  in any stock
exchange or automated  interdealer quotation system on which the common stock is
then  listed,  at prices and on terms then  prevailing  at the time of sale,  at
prices related to the then-current  market price or in negotiated  transactions.
Broker-dealers   may  use  block   transactions   and   sales  to  and   through
broker-dealers,  including  transactions  of the  nature  described  above.  The
selling  stockholders may also sell the common stock in accordance with Rule 144
or Rule 144A under the Securities Act, rather than pursuant to this  prospectus.
In order to comply with the securities laws of some states,  if applicable,  the
shares  of  common  stock  may be  sold  in  these  jurisdictions  only  through
registered or licensed brokers or dealers.

From  time  to  time,  one or  more  of the  selling  stockholders  may  pledge,
hypothecate  or grant a security  interest in some or all of the shares owned by
them.  The  pledgees,  secured  parties or person to whom the  shares  have been
hypothecated  will,  upon  foreclosure in

                                       20



the event of  default,  be deemed to be  selling  stockholders.  The number of a
selling  stockholder's shares offered under this prospectus will decrease as and
when  it  takes  such  actions.  The  plan  of  distribution  for  that  selling
stockholder's  shares will otherwise remain  unchanged.  In addition,  a selling
stockholder  may,  from  time to time,  sell the  shares  short,  and,  in those
instances,  this  prospectus may be delivered in connection with the short sales
and the shares offered under this prospectus may be used to cover short sales.

To the extent required under the Securities Act, the aggregate amount of selling
stockholders'  shares being offered and the terms of the offering,  the names of
any agents,  brokers,  dealers or  underwriters,  any applicable  commission and
other material facts with respect to a particular  offer will be set forth in an
accompanying  prospectus  supplement  or  a  post-effective   amendment  to  the
registration  statement of which this prospectus is a part, as appropriate.  Any
underwriters,  dealers,  brokers or agents  participating in the distribution of
the common stock may receive compensation in the form of underwriting discounts,
concessions, commissions or fees from a selling stockholder and/or purchasers of
selling  stockholders' shares, for whom they may act (which compensation as to a
particular   broker-dealer  might  be  less  than  or  in  excess  of  customary
commissions).  Neither we nor any selling stockholder can presently estimate the
amount of any such compensation.

The selling stockholders and any underwriters,  brokers,  dealers or agents that
participate  in the  distribution  of the  common  stock  may  be  deemed  to be
"underwriters"  within the meaning of the  Securities  Act,  and any  discounts,
concessions,  commissions  or fees received by them and any profit on the resale
of the securities  sold by them may be deemed to be  underwriting  discounts and
commissions.  If a  selling  stockholder  is deemed  to be an  underwriter,  the
selling stockholder may be subject to certain statutory  liabilities  including,
but not limited to Sections 11, 12 and 17 of the  Securities  Act and Rule 10b-5
under the Exchange Act. Selling  stockholders who are deemed underwriters within
the meaning of the  Securities  Act will be subject to the  prospectus  delivery
requirements  of the  Securities  Act.  The SEC staff is of a view that  selling
stockholders  who are  registered  broker-dealers  or  affiliates  of registered
broker-dealers may be underwriters under the Securities Act. We will not pay any
compensation  or  give  any  discounts  or  commissions  to any  underwriter  in
connection  with the  securities  being offered by this  prospectus.  Because of
their  affiliation  with a  broker-dealer,  Orion  Biomedical Fund, LP and Orion
Biomedical Offshore Fund, LP, each of which are selling stockholders,  is deemed
to be an  underwriter in connection  with the offering of its respective  shares
under this  prospectus.  Each of Orion  Biomedical Fund, LP and Orion Biomedical
Offshore Fund, LP has represented to us that it purchased its respective  shares
in the  ordinary  course of business  and at the time of such  purchase,  had no
agreements or understandings to distribute such shares.

A selling  stockholder may enter into hedging  transactions with  broker-dealers
and the  broker-dealers  may engage in short  sales of the  common  stock in the
course of hedging  the  positions  they assume  with that  selling  stockholder,
including,  without  limitation,  in connection with distributions of the common
stock by those  broker-dealers.  A selling  stockholder may enter into option or
other  transactions  with  broker-dealers,  who may  then  resell  or  otherwise
transfer those common stock. A selling  stockholder  may also loan or pledge the
common stock offered hereby to a broker-dealer  and the  broker-dealer  may sell
the common stock offered by this prospectus so loaned or upon a default may sell
or otherwise transfer the pledged common stock offered by this prospectus.

The  selling  stockholders  and  other  persons  participating  in the  sale  or
distribution of the common stock will be subject to applicable provisions of the
Exchange Act, and the rules and  regulations  under the Exchange Act,  including
Regulation M. This regulation may limit the timing of purchases and sales of any
of the  common  stock by the  selling  stockholders  and any other  person.  The
anti-manipulation  rules  under  the  Exchange  Act may apply to sales of common
stock in the market and to the activities of the selling  stockholders and their
affiliates.  Regulation M may restrict the ability of any person  engaged in the
distribution  of the common  stock to engage in  market-making  activities  with
respect to the particular  common stock being  distributed for a period of up to
five business days before the  distribution.  These  restrictions may affect the
marketability  of the  common  stock and the  ability of any person or entity to
engage in market-making activities with respect to the common stock.

We have agreed to indemnify the selling  stockholders  who  participated  in our
March 9, 2005 private placement (the "Private  Placement  Stockholders") and any
brokers, dealers and agents who may be deemed to be underwriters, if any, of the
common  stock  offered  by  this  prospectus,   against  specified  liabilities,
including   liabilities   under  the  Securities  Act.  The  Private   Placement
Stockholders have agreed to indemnify us against specified liabilities.

The common stock offered by this prospectus was originally issued to the Private
Placement   Stockholders   pursuant  to  an  exemption  from  the   registration
requirements of the Securities Act, as amended. We agreed to register the common
stock issued to the Private Placement Stockholders under the Securities Act, and
to keep the registration  statement of which this prospectus is a part effective
until three years after the effective  date of the  registration  statement.  We
have agreed to pay all expenses incident to the registration of the common stock
held by the Private Placement Stockholders in connection with this offering, but
all selling expenses related to the securities  registered shall be borne by the
individual  holders  of such  securities  pro rata on the basis of the number of
shares of securities so registered on their behalf.

We cannot assure you that the selling  stockholders will sell all or any portion
of the common stock offered by this  prospectus.  In addition,  we cannot assure
you that a selling  stockholder will not transfer the shares of our common stock
by other means not described in this prospectus.

                                       21




                                  LEGAL MATTERS

The validity of the common stock will be passed upon by Sichenzia  Ross Friedman
Ference LLP, New York,  New York.  Sichenzia  Ross Friedman  Ference LLP owns an
aggregate of 22,000 shares of Callisto's common stock.

                                     EXPERTS

The financial statements  incorporated by reference in this prospectus have been
audited by BDO Seidman,  LLP, an independent  registered public accounting firm,
to the extent and for the periods set forth in their report  incorporated herein
by  reference,  and are  incorporated  herein in reliance upon such report given
upon the authority of said firm as experts in auditing and accounting.





                                       22



                                     PART II

                   INFORMATION NOT REQUIRED IN THE PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

The following table sets forth an estimate of the costs and expenses  payable by
Callisto Pharmaceuticals, Inc. in connection with the offering described in this
registration  statement.  All of the  amounts  shown are  estimates  except  the
Securities and Exchange Commission ("SEC") registration fee:

               Securities and Exchange Commission Registration Fee          $332
               Printing and Engraving Expenses                             2,500
               Accounting Fees and Expenses                                7,000
               Legal Fees and Expenses                                    15,000
               Miscellaneous                                                 168
                                                                         -------
                         Total                                           $25,000
                                                                         =======

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS

Callisto  Pharmaceuticals,  Inc.'s Certificate of Incorporation provides that to
the fullest extent permitted by the Delaware General Corporation Law, a director
of the company shall not be personally liable to the company or its stockholders
for monetary  damages for breach of fiduciary duty as a director.  Under current
Delaware  law,  liability of a director may not be limited (i) for any breach of
the director's duty of loyalty to the company or its stockholders, (ii) for acts
or  omissions  not in good faith or that  involve  intentional  misconduct  or a
knowing  violation of law, and (iii) for any transaction from which the director
derives an improper personal benefit.

The effect of the provision of Callisto's  Certificate  of  Incorporation  is to
eliminate the rights of the company and its stockholders (through  stockholders'
derivative suits on behalf of the company) to recover monetary damages against a
director  for  breach of the  fiduciary  duty of care as a  director  (including
breaches  resulting from negligent or grossly negligent  behavior) except in the
situations described in clauses (i) through (iii) above. This provision does not
limit  or  eliminate  the  rights  of the  company  or any  stockholder  to seek
nonmonetary  relief such as an injunction or rescission in the event of a breach
of  a  director's  duty  of  care.  In  addition,   Callisto's   Certificate  of
Incorporation  provides that the company shall  indemnify to the fullest  extent
permitted by law its directors,  officers and employees and any other persons to
which  Delaware law permits a  corporation  to provide  indemnification  against
losses  incurred  by any such  person by reason of the fact that such person was
acting in such capacity.

Callisto has an insurance policy that insures its directors and officers, within
the limits  and  subject  to the  limitations  of the  policy,  against  certain
expenses in connection with the defense of actions,  suits or  proceedings,  and
certain liabilities that might be imposed as a result of such actions,  suits or
proceedings,  to which  they are  parties  by  reason  of being or  having  been
directors or officers.

ITEM 16. EXHIBITS

EXHIBIT
 NUMBER            DESCRIPTION
-------            -----------

    5.1            Opinion of Sichenzia Ross Friedman Ference LLP*
   23.1            Consent of BDO Seidman, LLP
   23.2            Consent of Sichenzia Ross Freidman Ference LLP
                   (included in Exhibit 5.1)*
     24            Power of Attorney (included on Page II-3)*

* Previously filed.

ITEM 17. UNDERTAKINGS

1. The undersigned  registrant  hereby  undertakes to file, during any period in
which  offers  or sales are  being  made,  a  post-effective  amendment  to this
registration statement:

            (i)   To include any prospectus  required by Section 10(a)(3) of the
                  Securities Act of 1933.

            (ii)  To reflect in the prospectus any facts or events arising after
                  the effective date of the registration


                                      II-1


                  statement  (or  the  most  recent   post-effective   amendment
                  thereof) which, individually or in the aggregate,  represent a
                  fundamental  change  in  the  information  set  forth  in  the
                  registration  statement.  Notwithstanding  the foregoing,  any
                  increase or decrease in volume of  securities  offered (if the
                  total dollar value of securities offered would not exceed that
                  which was  registered)  and any deviation from the low or high
                  end of the estimated  maximum  offering range may be reflected
                  in the form of prospectus  filed with the Commission  pursuant
                  to Rule 424(b) if, in the aggregate, the changes in volume and
                  price  represent no more than 20 percent change in the maximum
                  aggregate  offering  price  set forth in the  "Calculation  of
                  Registration   Fee"  table  in  the   effective   registration
                  statement.

            (iii) To include any material  information  with respect to the plan
                  of distribution  not previously  disclosed in the registration
                  statement or any material  change to such  information  in the
                  registration statement.

                  Provided, however, that paragraphs (B)(1)(i) and (B)(1)(ii) of
                  this section do not apply if the registration  statement is on
                  Form S-3, Form S-8 or Form F-3, and the  information  required
                  to  be  included  in  a  post-effective   amendment  by  those
                  paragraphs  is  contained  in periodic  reports  filed with or
                  furnished  to the  Commission  by the  Registrant  pursuant to
                  Section  13 or  Section  15(d)  of the  Exchange  Act that are
                  incorporated by reference in the registration statement.

2. The  undersigned  registrant  hereby  undertakes  that,  for the  purpose  of
determining  any liability  under the Securities  Act of 1933, as amended,  each
such post-effective amendment shall be deemed to be a new registration statement
relating to the securities offered therein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

3. The undersigned  registrant  hereby undertakes to remove from registration by
means of a post-effective  amendment any of the securities being registered that
remain unsold at the termination of the offering.

4.  The  undersigned   registrant   hereby  undertakes  that,  for  purposes  of
determining  any  liability  under  the  Securities  Act,  each  filing  of  the
registrant's  annual  report  pursuant to Section  13(a) or Section 15(d) of the
Exchange Act (and, where  applicable,  each filing of an employee benefit plan's
annual  report   pursuant  to  Section  15(d)  of  the  Exchange  Act)  that  is
incorporated by reference in the registration  statement shall be deemed to be a
new registration  statement relating to the securities offered therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

5. Insofar as indemnification  for liabilities  arising under the Securities Act
of 1933,  as amended,  may be permitted to directors,  officers and  controlling
persons of the undersigned  registrant  according the foregoing  provisions,  or
otherwise,  the  undersigned  registrant has been advised that in the opinion of
the Securities and Exchange  Commission such  indemnification  is against public
policy as expressed in the Act and is,  therefore,  unenforceable.  In the event
that a claim  for  indemnification  against  such  liabilities  (other  than the
payment by the Registrant of expenses incurred or paid by a director, officer or
controlling  person of the registrant in the  successful  defense of any action,
suit or proceeding) is asserted by such director,  officer or controlling person
in connection with the securities being registered,  the registrant will, unless
in the  opinion  of its  counsel  the matter  has been  settled  by  controlling
precedent,  submit to a court of appropriate  jurisdiction  the question whether
such  indemnification  by it is  against  public  policy  as  expressed  in  the
Securities  Act of  1933,  as  amended,  and  will  be  governed  by  the  final
adjudication of such issue.

6. The undersigned registrant hereby undertakes that:

            (i)   For purposes of determining any liability under the Securities
                  Act  of  1933,  the  information  omitted  from  the  form  of
                  prospectus  filed as part of this  registration  statement  in
                  reliance  upon Rule 430A and contained in a form of prospectus
                  filed by the registrant  pursuant to Rule  424(b)(1)or  (4) or
                  497(h) under the  Securities Act shall be deemed to be part of
                  this  registration  statement  as of the time it was  declared
                  effective.

            (ii)  For  the  purpose  of  determining  any  liability  under  the
                  Securities  Act of 1933,  each  post-effective  amendment that
                  contains  a form of  prospectus  shall be  deemed  to be a new
                  registration  statement  relating  to the  securities  offered
                  therein,  and the  offering  of such  securities  at that time
                  shall be deemed to be the initial bona fide offering thereof.





                                      II-2




                                   SIGNATURES

In accordance  with the  requirements of the Securities Act of 1933, as amended,
the registrant certifies that it has reasonable grounds to believe that it meets
all of the  requirements  for  filing  on  Form  S-3 and has  duly  caused  this
Amendment  No. 1 to Form S-3 to be  signed  on its  behalf  by the  undersigned,
thereunto duly  authorized,  in the City of New York, State of New York, on June
6, 2005.

                                   CALLISTO PHARMACEUTICALS, INC.

                                                     By: /s/ Gary S. Jacob
                                                         ----------------------
                                                         Gary S. Jacob,
                                                         CHIEF EXECUTIVE OFFICER

In accordance  with the  requirements of the Securities Act of 1933, as amended,
this Amendment No. 1 to Form S-3 has been signed below by the following  persons
in the capacities and on the dates indicated.

   SIGNATURE                        TITLE                              DATE
   ---------                        -----                              ----
 
/s/ Gary S. Jacob      Chief Executive Officer and Director         June 6, 2005
-------------------    (Principal Executive Officer)
    Gary S. Jacob

       *               Vice President, Finance                      June 6, 2005
-------------------    (Principal Financial and Accounting Officer)
Bernard Denoyer

       *               Chairman of the Board                        June 6, 2005
-------------------
Gabriele M. Cerrone

                       Director                                         __, 2005
-------------------
Edwin Snape

       *               Director                                     June 6, 2005
-------------------
Christoph Bruening


       *               Director                                     June 6, 2005
-------------------
John P. Brancaccio

       *               Director                                     June 6, 2005
-------------------
Stephen Carter

      *               Director                                      June 6, 2005
-------------------
Randall K. Johnson

*  By: /s/ Gary S. Jacob
       ---------------------
           Gary S. Jacob
           Attorney-in-Fact



                                      II-3