TITAN PHARMACEUTICALS INC
424B4, 1998-01-16
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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PROSPECTUS

                           TITAN PHARMACEUTICALS, INC.

      This Prospectus relates to the offer and resale by Hoechst Marion Roussel,
Inc.  (the "Selling  Stockholder")  of 594,595  shares (the  "Shares") of common
stock, $.001 par value (the "Common Stock") of Titan Pharmaceuticals,  Inc. (the
"Company").

      The Company is obligated under certain circumstances,  upon the request of
the Selling Stockholder, to pay the Selling Stockholder, in cash, the difference
between  (i)  $5,500,000  and  (ii) the net  proceeds  received  by the  Selling
Stockholder from the sale of Shares. See "Selling Stockholder."

   
      The  Selling  Stockholder  is  obligated  to sell  the  Shares  through  a
broker-dealer  designated  by the  Company.  The Company has  designated  Everen
Securities,  Inc.  ("Everen"), which firm has advised that it intends to use its
best efforts to place the Shares primarily with institutional investors. Subject
to the foregoing,  the Shares may be offered by the Selling  Stockholder through
Everen  from time to time in  transactions  on the Nasdaq  SmallCap  Market,  in
privately negotiated transactions,  or a combination of such methods of sale, at
fixed prices that may be changed,  at market  prices  prevailing  at the time of
sale,  at prices  related  to such  prevailing  market  prices or at  negotiated
prices.  The  Selling  Stockholder  and Everen may effect such  transactions  by
selling the Shares to or through other broker-dealers, and Everen and such other
broker-dealers may receive compensation in the form of discounts, concessions or
commissions  from the Selling  Stockholder  or the  purchasers of the Shares for
whom  they  act as  agent  or to whom  they  sell as  principal  or both  (which
compensation  to a  particular  broker-dealer  might be in excess  of  customary
commissions). See "Selling Stockholder" and "Plan of Distribution."
    

      The  Company  will not receive  any of the  proceeds  from the sale of the
Shares by the  Selling  Stockholder.  The  Company  has  agreed to bear  certain
expenses (other than fees and expenses,  if any, of counsel or other advisors to
the Selling  Stockholder)  in connection with the  registration  and sale of the
Shares.  The Company has agreed to  indemnify  the Selling  Stockholder  against
certain  liabilities,  including certain liabilities under the Securities Act of
1933, as amended (the "Act").

   
      The Company's  Units,  Common Stock and Class A Warrants are traded on The
Nasdaq  SmallCap  Market  ("Nasdaq")  under the symbols TTNPU,  TTNP, and TTNPW,
respectively. On January 15, 1998, the closing prices of the Units, Common Stock
and Warrants were $5.50, $4.56 and $1.00, respectively.
    

                                   ----------

     THE SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK. SEE "RISK
                          FACTORS" BEGINNING ON PAGE 5.

                                   ----------

THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE  COMMISSION OR ANY STATE  SECURITIES  COMMISSION NOR HAS THE SECURITIES
AND  EXCHANGE  COMMISSION  OR ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

   
                 The date of this Prospectus is January 16, 1998
    

<PAGE>

                              AVAILABLE INFORMATION

      The Company has filed with the  Securities  and Exchange  Commission  (the
"Commission"),  Washington,  D.C. a Registration Statement on Form S-3 under the
Securities Act of 1993, as amended (the "Act")  covering the securities  offered
by this Prospectus.  This Prospectus does not contain all of the information set
forth  in the  Registration  Statement  and  the  exhibits  thereto.  Statements
contained  in this  Prospectus  as to the  contents  of any  contract  or  other
document  referred to are not  necessarily  complete and in each  instance  such
statement  is qualified  by  reference  to each such  contract or document.  The
Company is subject to the informational  requirements of the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), and in accordance  therewith files
reports and other  information with the Commission.  Copies of such material can
be obtained  from the Public  Reference  Section of the  Commission at 450 Fifth
Street,  N.W.,  Washington,  D.C. 20549 at prescribed  rates.  The Company is an
electronic filer, and the Commission maintains a web site that contains reports,
proxy and information  statements and other information regarding the Company at
www.sec.gov./edgar.html.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

      The  following  documents  filed with the  Commission  (File No.  0-27436)
pursuant to the Exchange Act are incorporated herein by reference:

1.    The  Company's  Annual  Report on Form  10-KSB for the  fiscal  year ended
      December  31,  1996,   including   any   documents  or  portions   thereof
      incorporated by reference therein;

2.    The  Company's  Current  Report on Form 8-K filed with the  Commission  on
      January 15, 1997;

3.    The Company's  Quarterly  Report on Form 10-QSB for the period ended March
      31, 1997;

4.    The Company's  Current Report on Form 8-K filed with the Commission on May
      30, 1997;

5.    The Company's Current Report on Form 8-K filed with the Commission on June
      10, 1997;

6.    The Company's definitive Proxy Statement dated June 25, 1997;

7.    The  Company's  Quarterly  Report on Form 10-QSB for the period ended June
      30, 1997;

8.    The Company's Current Report on Form 8-K filed with the Commission on July
      18, 1997;

9.    The  Company's  Quarterly  Report  on Form  10-QSB  for the  period  ended
      September 30, 1997;

10.   The  Company's  Current  Report on Form 8-K filed with the  Commission  on
      November 21, 1997;
  
11.   The  Company's  Registration  Statement on Form 8-A declared  effective on
      January 18, 1996,  registering the Common Stock and Class A Warrants under
      the Exchange Act; and

12.   All other  documents  filed by the Company  pursuant  to  Sections  13(a),
      13(c),  14 or 15(d) of the  Exchange  Act  subsequent  to the date of this
      Prospectus and prior to the termination of this offering.

      Any  statement  contained  in any  document  incorporated  or deemed to be
incorporated  by reference  herein shall be deemed to be modified or  superseded
for purposes of this Prospectus to the extent that a statement  contained herein
or in  any  subsequently  filed  document  which  also  is or  is  deemed  to be
incorporated by reference herein modifies or supersedes such statement. Any such
statement so modified or superseded  shall not be deemed,  except as modified or
superseded,  to constitute a part of this  Prospectus.  The Company will provide
without charge to each person to whom this Prospectus is delivered, upon written
or oral  request  of any  such  person,  a copy  of any or all of the  documents
incorporated  herein by reference  (other than exhibits to such documents  which
are not specifically  incorporated by reference into such  documents).  Requests
for  such  documents  should  be  directed  to the  Company,  400  Oyster  Point
Boulevard,  South San Francisco,  California 94080,  Attention:  Chief Financial
Officer, telephone (415) 244-4990.


                                       2
<PAGE>

                               PROSPECTUS SUMMARY

   
      This Prospectus contains forward-looking statements that involve risks and
uncertainties.  The Company's actual results may differ  significantly  from the
results discussed in the forward-looking statements due to, among other factors,
the results of ongoing  research and development  activities,  pre-clinical  and
clinical  testing,  financing and strategic  agreements and  relationships;  and
those factors discussed in the Section entitled "Risk Factors," as well as those
factors described elsewhere herein and in any documents actually or deemed to be
incorporated herein.
    

      Titan  Pharmaceuticals,  Inc.  ("Titan") is engaged in the  development of
therapeutic  products  for the  treatment  of cancer,  disorders  of the central
nervous system and other serious and life-threatening diseases. Titan's products
utilize core technologies,  including  molecular therapy,  cell therapy and gene
therapy.  Titan's strategy is to develop the products in its current  portfolio,
while  actively  seeking  to  acquire   additional   complementary   therapeutic
technologies and products.

      In January  1997,  Titan  obtained an  exclusive  worldwide  license  from
Hoechst  Marion  Roussel,   Inc.  ("Hoechst")  to  Iloperidone,   an  "atypical"
antipsychotic  agent in  development  for the  treatment  of  schizophrenia  and
related  disorders.  Iloperidone  has  been  evaluated  in  Phase I and II human
clinical trials and is set to enter Phase III clinical trials. In November 1997,
Titan  entered into an agreement  (the"  Sublicense  Agreement")  with  Novartis
Pharma AG  ("Novartis")  pursuant to which Novartis was granted a sublicense for
the  worldwide  (with the  exception of Japan)  development,  manufacturing  and
marketing of Iloperidone.  Pursuant to the Sublicense  Agreement,  Novartis paid
Titan $18 million in license fees and  reimbursement of research and development
expenses and made a $5 million  equity  investment in Titan,  and is required to
make additional milestone and royalty payments to Titan.

      Titan's  product   pipeline   includes  three  potential  cancer  vaccines
utilizing anti-idiotypic antibody technology which have demonstrated the ability
to  generate  an  immune  response   against   antigens   associated  with  most
adenocarcinomas  (such  as  colon,  gastrointestinal  and  non-small  cell  lung
cancer), breast cancer, small cell lung cancer, ovarian cancer and melanoma: Cea
Vac,  TriGem and TriAB  have all  completed  Phase I clinical  trials in various
cancer types and Phase II/III studies are planned for 1998.

      Two  additional  cancer  products in Titan's  portfolio are MDRx1,  a gene
therapy product which has completed Phase I testing in ovarian and breast cancer
patients at M.D.  Anderson Cancer Center in Houston,  and Pivanex  Injection,  a
product which has demonstrated  encouraging results in an ongoing Phase I study.
Titan's portfolio also includes  additional  potential cancer  therapeutics,  as
well as two platform  technologies  and two potential  products  relating to the
treatment  of central  nervous  system  ("CNS")  diseases,  which are all in the
preclinical development stage.

      A portion of Titan's  operations  are  currently  conducted  through three
entities (the  "Operating  Companies").  Ingenex,  Inc.  ("Ingenex"),  a company
engaged in the development of proprietary gene-based therapies;  ProNeura, Inc.,
("ProNeura"),  a company engaged in research and development activities relating
to a  polymeric  implantable  drug  delivery  technology;  and  Theracell,  Inc.
("Theracell"),  a company engaged in the development of cell-based  therapeutics
intended  for the  restorative  treatment of  neurological  diseases and central
nervous  system  disorders.  In  November  1997,  Ansan  Pharmaceuticals,   Inc.
("Ansan"),  a former  Operating  Company,  completed a merger which  resulted in
Titan  divesting  itself of its equity  interest  in Ansan in  exchange  for the
rights to Pivanex  Injection and the repayment of  outstanding  indebtedness  to
Titan.

      References  to the Company  include  the  Operating  Companies  unless the
context requires otherwise. Titan was incorporated in Delaware in February 1992.
Titan's  executive  offices are located at 400 Oyster  Point  Blvd.,  Suite 505,
South  San  Francisco,  California  94080,  and its  telephone  number  is (415)
244-4990.


                                       3
<PAGE>

                                  RISK FACTORS

   
      The Shares offered  hereby are  speculative in nature and an investment in
the Shares  offered  hereby  involves a high degree of risk.  In addition to the
other  information  contained in this Prospectus,  prospective  investors should
carefully  consider the following risk factors in evaluating whether to purchase
the Shares offered hereby.

      History of Operating Losses;  Need for Additional  Financing.  The Company
has experienced  substantial  operating losses since its inception in July 1991.
As of September 30, 1997, the Company's  accumulated  deficit was  approximately
$56.9 million. Such losses have been principally the result of the various costs
associated with research and development  activities and the Company's provision
of  financial,  administrative,   regulatory  and  management  services  to  the
Operating  Companies.  At December  15, 1997 the Company had working  capital of
approximately  $25.5 million and believes that available funds will enable it to
fund its operations  for at least 18-24 months.  The Company will be required to
seek substantial  additional financing to commercialize any products that it may
successfully  develop.  The Company has no bank lines of credit and there can be
no  assurance  that the  Company  will be able to obtain any  needed  additional
financing on commercially reasonable terms.
    

      Early Stage of Development of Proposed  Products.  The Company's  proposed
products  are at various  stages of  development  and will  require  significant
further  research,  development,  testing  and  regulatory  clearances  prior to
commercialization.  There can be no assurance that any proposed products will be
successfully  developed,  prove to be safe and  efficacious,  receive  requisite
regulatory  approvals,  demonstrate  substantial  therapeutic  benefits  in  the
treatment  of any  disease  or  condition,  be  capable  of  being  produced  in
commercial   quantities  at  reasonable  costs  or  be  successfully   marketed.
Accordingly,  the Company must be evaluated  in light of the  expenses,  delays,
uncertainties  and  complications  typically  encountered  by newly  established
biopharmaceutical businesses, many of which may be beyond the Company's control.
These  include,  but are not  limited  to,  unanticipated  problems  relating to
product development,  testing, regulatory compliance,  manufacturing,  marketing
and  competition,  and  additional  costs and expenses  that may exceed  current
estimates.  There can be no assurance that the Company will successfully develop
and commercialize any products or ever achieve profitable operations.

      Government Regulation.  The research,  preclinical  development,  clinical
trials,  product  manufacturing and marketing to be conducted by or on behalf of
the Company are subject to regulation by the FDA and similar health  authorities
in foreign  countries.  FDA approval of products,  as well as the  manufacturing
processes  and  facilities,  if any,  used to  produce  such  products,  will be
required before such products may be  commercialized  in the United States.  The
process of obtaining  approvals from the FDA is costly, time consuming and often
subject to unanticipated delays. There can be no assurance that approvals of any
of the proposed  products,  processes or facilities  will be granted on a timely
basis,  if at all.  Even if  regulatory  approval is granted,  such approval may
include  significant  limitations  on indicated uses for which any such products
could be marketed.  Further,  even if such regulatory  approvals are obtained, a
marketed drug and its  manufacturer are subject to continued  review,  and later
discovery of  previously  unknown  problems may result in  restrictions  on such
product or  manufacturer,  including  withdrawal of the product from the market.
New government regulations in the United States or foreign countries also may be
established  that could delay or prevent  regulatory  approval of products under
development.  Further,  because gene therapy is a relatively  new technology and
has not been extensively tested in humans, the regulatory requirements governing
gene therapy  products are uncertain and may be subject to  substantial  further
review by various regulatory  authorities in the United States and abroad.  This
uncertainty may result in extensive delays in initiating  clinical trials and in
the regulatory approval process for Ingenex.  Regulatory requirements ultimately
imposed could have a material  adverse  effect upon the business of Ingenex and,
ultimately, the Company. Failure by the Company to obtain regulatory approval of
its proposed  products,  processes or facilities  could have a material  adverse
effect on its  business,  financial  condition  and results of  operations.  The
proposed  products  under  development  may also be  subject  to  certain  other
federal, state and local government regulations,  including, but not limited to,
the Federal Food, Drug and Cosmetic Act, the  Environmental  Protection Act, the
Occupational Safety and Health Act, and state, local and foreign counterparts to
certain of such acts.

      Reliance on Patents and Other  Proprietary  Rights.  The Company's success
will depend, in part, on its ability, and the ability of the Operating Companies
and their licensor(s),  to obtain protection for their products and technologies
under United States and foreign  patent laws, to preserve  their trade  secrets,
and to operate without infringing the proprietary  rights of third parties.  The
Company has obtained rights to certain patents and patent  applications and may,
in the future,  seek rights from third parties to additional  patents and patent
applications. 


                                       4
<PAGE>

There  can be no  assurance  that  patent  applications  relating  to  potential
products or  technologies,  including  those  licensed from others,  or that the
Company may license in the future, will result in patents being issued, that any
issued   patents  will  afford   adequate   protection  or  not  be  challenged,
invalidated,  infringed, or circumvented,  or that any rights granted thereunder
will afford competitive advantages to the Company. Furthermore,  there can be no
assurance   that  others  have  not   independently   developed,   or  will  not
independently  develop,  similar products and/or technologies,  duplicate any of
the  Company's  products  or  technologies,  or, if  patents  are  issued to, or
licensed by, the Company, design around such patents.

      There can be no assurance that the validity of any of the patents licensed
to the Company would be upheld if challenged by others in litigation or that the
Company's  activities  would not infringe  patents owned by others.  The Company
could incur substantial costs in defending itself and/or the Operating Companies
in suits brought  against them or any of their  licensors,  or in suits in which
the Company may assert, against others, patents in which the Company has rights.
Should the  Company's  products or  technologies  be found to  infringe  patents
issued to third parties,  the manufacture,  use, and sale of such products could
be enjoined and the Company  could be required to pay  substantial  damages.  In
addition,  the Company  may be  required to obtain  licenses to patents or other
proprietary rights of third parties,  in connection with the development and use
of their products and technologies.  No assurance can be given that any licenses
required under any such patents or proprietary rights would be made available on
acceptable terms, if at all.

      Titan also relies on trade  secrets  and  proprietary  know-how,  which it
seeks to  protect,  in  part,  by  confidentiality  agreements  with  employees,
consultants,  advisors,  and  others.  There  can  be  no  assurance  that  such
employees,  consultants,  advisors, or others, will maintain the confidentiality
of such trade secrets or proprietary  information,  or that the trade secrets or
proprietary  know-how  of the  Company  will not  otherwise  become  known or be
independently  developed by  competitors  in such a manner that the Company will
have no practical recourse.

      Titan is aware of an issued United States patent (as well as corresponding
patents and patent  applications  in foreign  countries)  relating to  multidrug
resistance in mammalian cells. This patent claims substantially the same subject
matter as is claimed by certain  issued  United  States  patents  that have been
licensed  by  Ingenex.  The  Company  is also aware of an issued  United  States
patent,  relating to ex vivo gene therapy. The Company believes that this patent
claims subject matter that relates to any gene therapeutic  developed by Ingenex
to the extent  that the  introduction  of the gene into the  subject's  cells is
performed ex vivo.  Thus,  it may be  necessary  for Ingenex to obtain a license
under either or both of such patents to pursue commercialization of its proposed
gene  therapy  products  utilizing  the  MDR1  gene  or ex  vivo  therapies,  as
applicable.  There can be no assurance  that Ingenex will be able to obtain such
licenses  or  that  such  licenses,  if  available,  can be  obtained  on  terms
acceptable to Ingenex.  Failure of Ingenex to obtain such licenses  could have a
material  adverse  effect on the  business,  financial  condition and results of
operations  of Ingenex and the Company.  Ingenex has received  notice that three
companies are opposing the grant of a European  patent which has claims directed
to the human MDR1 gene and gene fragments.

      Competition and Technological  Change.  Competition in the  pharmaceutical
and biotechnology industries is intense and is expected to increase. The Company
will face  competition  from numerous  companies that currently  market,  or are
developing, products for the treatment of diseases and disorders targeted by the
Company.  Many  of  these  entities  have  significantly  greater  research  and
development  capabilities,  experience  in obtaining  regulatory  approvals  and
manufacturing,  marketing,  financial and managerial resources than the Company.
Acquisitions  of or  investments in competing  biotechnology  companies by large
pharmaceuticals  companies could enhance such competitors' financial,  marketing
and other  resources.  The Company also  competes  with  universities  and other
research   institutions  in  the  development  of  products,   technologies  and
processes.  There can be no assurance  that  competitors of the Company will not
succeed in developing  technologies or products that are more effective than the
Company  or  that  will   render  the   Company's   products   or   technologies
noncompetitive or obsolete. In addition, certain of such competitors may achieve
product commercialization or patent protection earlier than the Company.

      Dependence Upon Key Collaborative  Relationships and License and Sponsored
Research Agreements.  The Company relies significantly on the resources of third
parties to conduct research and development.  The Company's success will depend,
in part, on its ability and the ability of the  Operating  Companies to maintain
existing   collaborative   relationships   and  to  develop  new   collaborative
relationships  with third  parties.  There can be no assurance  that the Company
will be successful in maintaining  its existing  collaborative  arrangements  or
that   any   collaborative    arrangements   will   lead   to   the   successful
commercialization of products.


                                       5
<PAGE>

      The license  agreements  relating to the  in-licensing  of technology that
have been or may in the future be entered  into by the Company or the  Operating
Companies typically require the payment of an up-front license fee and royalties
based on sales of  licensed  products  and  processes  under the license and any
sublicense with minimum annual royalties, the use of due diligence in developing
and bringing products to market,  the achievement of funding  milestones and, in
some  cases,  the  grant  of  stock  to the  licensor.  The  sponsored  research
agreements  that have been or may in the  future be  entered  into by  generally
require periodic  payments on an annual or quarterly basis. Some agreements also
may require  funding or  production  facilities  relating to clinical  research.
Failure to meet financial or other obligations  under either license  agreements
or sponsored  research  agreements in a timely manner, the rights to proprietary
technology or the right to have the applicable university or institution conduct
research and development efforts could be lost.

      Dependence on Third Parties for Manufacturing and Marketing Activities. To
date, the Company has not introduced any products on the commercial  market.  To
conduct human  clinical  trials and  ultimately to gain market  acceptance,  the
products under  development  must be  manufactured in compliance with regulatory
requirements  and at acceptable  costs. It is not expected that the Company will
have the resources in the  foreseeable  future to allocate to the manufacture or
direct marketing of any proposed  products and,  therefore,  it is intended that
collaborative arrangements be pursued regarding the manufacture and marketing of
any products that may be successfully developed.  There can also be no assurance
that additional collaborative arrangements to manufacture or market any proposed
products  will be  entered  into or,  in lieu  thereof,  that any  manufacturing
operations  can be  successfully  established  or that any  sales  force  can be
successfully implemented.

      Dependence  on Key  Personnel.  The  Company  is highly  dependent  on the
services of Dr. Louis R. Bucalo,  President and Chief Executive Officer, as well
as the other principal members of management and scientific staff of the Company
and the Operating  Companies.  The loss of one or more of such individuals could
substantially impair ongoing research and development programs and the Company's
ability  to obtain  additional  financing.  The future  success  of the  Company
depends in large part upon its ability and that of the  Operating  Companies  to
attract and retain highly qualified personnel. This intense competition for such
highly  qualified   personnel  from  other   pharmaceutical   and  biotechnology
companies, as well as universities and nonprofit research organizations, and may
have to pay higher salaries to attract and retain such  personnel.  There can be
no assurance that sufficient  qualified personnel can be hired on a timely basis
or retained. The loss of such key personnel or failure to recruit additional key
personnel  could  have a  material  adverse  effect on the  Company's  business,
financial condition and results of operations.

      Shares  Eligible for Future Sale.  Future  sales of the  Company's  Common
Stock by existing  stockholders  pursuant to Rule 144 under the Securities  Act,
pursuant to an  effective  registration  statement or  otherwise,  could have an
adverse effect on the price of the Company's securities.

                                 USE OF PROCEEDS

      The Company will not receive any  proceeds  from the sale of the Shares by
the Selling Stockholder.

                                 DIVIDEND POLICY

      The Company has never paid cash dividends on its Common Stock and does not
anticipate  paying  cash  dividends  in  the  foreseeable  future.  The  Company
currently  intends to retain all  earnings,  if any, for use in the expansion of
the Company's business. The declaration and payment of future dividends, if any,
will be at the sole  discretion  of the Board of Directors  and will depend upon
the Company's  profitability,  financial  condition,  cash requirements,  future
prospects and other factors deemed relevant by the Board of Directors.


                                       6
<PAGE>

                               SELLING STOCKHOLDER

      In January 1997, the Company issued the Shares to the Selling  Stockholder
in connection with entering into a worldwide exclusive license agreement for the
antipsychotic  agent,  Iloperidone  (the "HMR  Agreement").  Pursuant to the HMR
Agreement,  the Company agreed,  at the request of the Selling  Stockholder,  to
register  the Shares  under the Act to permit  public  secondary  trading of the
Shares.The HMR Agreement obligates the Company,  upon the request of the Selling
Stockholder, to pay the Selling Stockholder, in cash, the difference between (i)
$5,500,000 and (ii) the net proceeds  received by the Selling  Stockholder  from
the sale of Shares within 10 days of receipt of written  notice from the Selling
Stockholder.  Notice  is  required  to be  provided  upon  the  earlier  of  (i)
completion of the sale of the Shares or (ii) 120 days after the  effective  date
of the  registration  statement on Form S-3 (the  "Registration  Statement")  of
which this  Prospectus  forms a part. The Selling  Stockholder  has notified the
Company  that it intends to make such a request for  payment at the  appropriate
time.  Any  Shares   remaining  unsold  pursuant  to  this  Prospectus  will  be
surrendered to the Company.
      The  Company  has agreed to bear  certain  expenses  (other  than fees and
expenses,  if any, of counsel to the Selling Stockholder) in connection with the
registration  and sale of the Shares being  offered by the Selling  Stockholder.
See "Plan of  Distribution."  The  Company  has agreed to prepare  and file such
amendments and supplements to the  Registration  Statement and Prospectus as may
be necessary to keep the Registration Statement effective as provided for in the
HMR Agreement.

      The  following  table  sets  forth  certain   information   regarding  the
beneficial  ownership of Common Stock by the Selling Stockholder and as adjusted
to give effect to the sale of the Shares offered hereby.

                                                       Percentage
                                   Number of Shares     Ownership     Number of
                                  Beneficially Owned    Prior to    Shares Being
Selling Stockholder(1)           Prior to Offering(2)    Offering    Offered(2)
- ----------------------           --------------------    --------    ----------
Hoechst Marion Roussel, Inc.            594,595            4 43%       594,595

(1)   The address of such stockholder is 10236 Marion Park Drive, Dock 6, Kansas
      City, Missouri 64137.

                              PLAN OF DISTRIBUTION

   
      Pursuant to the HMR  Agreement,  the Selling  Stockholder  is obligated to
sell the Shares through a broker-dealer  designated by the Company.  The Company
has designated Everen  Securities,  Inc. as the broker-dealer to effectuate such
sales.

      Everen has  advised  that it intends to use its best  efforts to place the
Shares primarily with  institutional  investors.  Subject to the foregoing,  the
Selling  Stockholder  may  sell  Shares  through  Everen  from  time  to time in
transactions   on  the  Nasdaq   SmallCap   Market,   in  privately   negotiated
transactions,  or a  combination  of such methods of sale, at fixed prices which
may be  changed,  at market  prices  prevailing  at the time of sale,  at prices
related to such prevailing  market prices or at negotiated  prices.  The Selling
Stockholder and Everen may effect such  transactions by selling the Shares to or
through  other  broker-dealers,  and Everen and such  other  broker-dealers  may
receive  compensation in the form of discounts,  concessions or commissions from
the Selling  Stockholder  or the  purchasers  of the Shares for whom they act as
agent or to whom  they  sell as  principal,  or both  (which  compensation  to a
particular broker-dealer might be in excess of customary commissions).

      The  Selling  Stockholder,  Everen  and  any  broker-dealers  who  act  in
connection with the sale of Shares hereunder may be deemed to be  "underwriters"
as that term is defined in the Act,  and any  commissions  received  by them and
profit  on any  resale  of  the  Shares  as  principal  might  be  deemed  to be
underwriting discounts and commissions under the Act.
    

      The  Company  has agreed to  indemnify  the  Selling  Stockholder  against
certain liabilities, including certain liabilities under the Act.

                                  LEGAL MATTERS

      The validity of the  securities  offered  hereby have been passed upon for
the Company by Bachner, Tally, Polevoy & Misher LLP, New York, New York.


                                       7
<PAGE>

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      No  dealer,  salesman  or other  person  has been  authorized  to give any
information or to make any  representations,  other than those contained in this
Prospectus,  and, if given or made, such information or representations must not
be relied upon as having been  authorized by the Company or by the  Underwriter.
This  Prospectus  does not constitute an offer to sell, or a solicitation  of an
offer to buy, any  securities  offered hereby by anyone in any  jurisdiction  in
which such offer or solicitation is not authorized or in which the person making
such offer or  solicitation is not qualified to do so or to anyone to whom it is
unlawful  to make such offer,  or  solicitation.  Neither  the  delivery of this
Prospectus nor any sale made hereunder shall,  under any  circumstances,  create
any implication that the information  herein contained is correct as of any time
subsequent to the date of this Prospectus.

                                   ----------

                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----
Available Information.......................................................  2
Incorporation of Certain Documents by Reference.............................  2
Prospectus Summary..........................................................  4
Risk Factors................................................................  5
Use of Proceeds.............................................................  9
Dividend Policy.............................................................  9
Selling Stockholder......................................................... 10
Plan of Distribution........................................................ 10
Legal Matters............................................................... 11

                                   ----------

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                           TITAN PHARMACEUTICALS, INC.


                                   PROSPECTUS


   
                                January 16, 1998
    

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