ARONEX PHARMACEUTICALS INC
10-Q, 1997-08-13
PHARMACEUTICAL PREPARATIONS
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                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                               ----------------
                                   FORM 10-Q
(Mark One)
    (X) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
        SECURITIES EXCHANGE ACT OF 1934
                  For the Quarterly Period Ended June 30, 1997
                                      OR
    ( ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
        EXCHANGE ACT OF 1934

                  For the transition period from _________ to _________
                          Commission File No. 0-20111
                         ARONEX PHARMACEUTICALS, INC.
            (Exact name of Registrant as specified in its charter)

               Delaware                               76-0196535
      (State or other jurisdiction        (I.R.S. Employer Identification No.)
   of incorporation or organization)
          3400 Research Forest Drive, The Woodlands, Texas 77381-4223
               (Address of principal executive office) (Zip Code)
      Registrant's telephone number, including area code: (281) 367-1666

      Indicate by check mark  whether the  Registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
Registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days.
                              Yes (X)       No ( )
      Indicate the number of shares  outstanding of each of the issuer's classes
of common stock as of the latest practicable date.
                  Class                         Outstanding at June 30, 1997
                  -----                         ----------------------------
     Common Stock, $.001 par value                    14,687,394 shares

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<PAGE>




                         ARONEX PHARMACEUTICALS, INC.
                        Quarterly Period June 30, 1997

                                     INDEX
                                                                          Page

FACTORS AFFECTING FORWARD LOOKING STATEMENTS..............................   3

PART I.     Financial Information

Item 1 Financial Statements...............................................   3

       Balance Sheets - December 31, 1996 and June 30, 1997 (unaudited)...   4

       Statements of Operations:
         Six Months Ended June 30, 1996 and June 30, 1997
         (unaudited) and for the Period from Inception (June 13, 1986)
         through June 30, 1997 (unaudited)................................   5

       Statements of Cash Flows:
         Six Months Ended June 30, 1996 and June 30, 1997
         (unaudited) and for the Period from Inception (June 13, 1986)
         through June 30, 1997 (unaudited)................................   6

       Notes to Financial Statements - June 30, 1997......................   7

Item 2 Management's Discussion and Analysis of Financial
         Condition and Results of Operations..............................   9


PART II.     Other Information

Item 4 Submission of Matters to Vote of Security Holders .................  12  

Item 6 Exhibits and Reports on Form 8-K...................................  13


SIGNATURES  ..............................................................  14






                               

                                      -2-

<PAGE>



                         

                  FACTORS AFFECTING FORWARD-LOOKING STATEMENTS

      This Quarterly Report on Form 10-Q includes  "forward-looking  statements"
within the meaning of Section 27A of the Securities Act of 1933, as amended, and
Section  21E of the  Securities  Exchange  Act of 1934,  as  amended.  The words
"anticipate," "believe," "expect," "estimate," "project" and similar expressions
are intended to identify forward-looking statements. Such statements are subject
to certain risks,  uncertainties  and  assumptions.  Should one or more of these
risks or  uncertainties  materialize,  or should  underlying  assumptions  prove
incorrect, actual results may vary materially from those anticipated,  believed,
expected,  estimated or  projected.  For  additional  discussion  of such risks,
uncertainties and assumptions,  see "Item 1. Business - Manufacturing," "- Sales
and  Marketing,"  "Patents,  Proprietary  Rights and  Licenses,"  "-  Government
Regulation," "- Competition"  and "- Additional  Business Risks" included in the
Company's  Annual Report on Form 10-K for the year ended  December 31, 1996, and
"Item 2. Management's Discussion and Analysis of Financial Condition and Results
of Operations"  and "- Liquidity and Capital  Resources"  included  elsewhere in
this report.

PART I.     FINANCIAL INFORMATION

Item 1     Financial Statements

   The following unaudited  financial  statements have been prepared pursuant to
the rules and  regulations of the Securities  and Exchange  Commission.  Certain
information  and  note  disclosures   normally   included  in  annual  financial
statements prepared in accordance with generally accepted accounting  principles
have been condensed or omitted pursuant to those rules and regulations, although
the Company  believes that the disclosures  made herein are adequate to make the
information presented not misleading.  These financial statements should be read
in  conjunction  with the financial  statements  for the year ended December 31,
1996  included in the  Company's  Annual  Report on Form 10-K for the year ended
December  31,  1996,  filed  pursuant  to Section 13 or 15(d) of the  Securities
Exchange Act of 1934.

   The  information  presented  in  the  accompanying  financial  statements  is
unaudited,  but in the opinion of management,  reflects all  adjustments  (which
include only normal  recurring  adjustments)  necessary  to present  fairly such
information.




                                   - 3-
     
<PAGE>

<TABLE>

                         ARONEX PHARMACEUTICALS, INC.
                         (A development stage company)

                                BALANCE SHEETS
                 (All amounts in thousands, except share data)


                                     ASSETS
<CAPTION>

                                                                     
                                                                     June 30,
                                                      December 31,    1997
                                                          1996     (Unaudited)   
                                                      -----------   ---------
<S>                                                   <C>           <C>
Current Assets:
  Cash and cash equivalents.......................    $     4,179   $   6,233
  Short-term investments..........................         30,414      25,468
  Accounts receivable - affiliates................             78          --
  Prepaid expenses and other assets...............            663         841
                                                      -----------   ---------
     Total current assets.........................         35,334      32,542

Long-term investments.............................          6,795       3,765
Furniture, equipment and leasehold improvements,
   net ...........................................          2,152       1,742
Other assets......................................             --         147
                                                      -----------   ---------
     Total assets.................................    $    44,281   $  38,196
                                                      ===========   =========

                      LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable and accrued expenses...........    $     1,191   $   1,153
  Accrued payroll.................................            126         101
  Advance payable to Genzyme......................          2,000       2,000
  Current portion of other notes payable..........            325         298
  Current portion of obligations under capital 
    leases .......................................             16          16
                                                      -----------   ---------
     Total current liabilities....................          3,658       3,568

Long-term obligations:
  Other notes payable, net of current portion.....            121          --
  Obligations under capital leases, net of 
   current portion ...............................             25          18
                                                      -----------   ---------
     Total long-term obligations..................            146          18

Commitments and contingencies

Stockholders' equity:
  Preferred stock $.001 par value, 5,000,000 
   shares authorized, none issued and 
   outstanding.... ...............................             --          --
  Common stock $.001 par value, 30,000,000 shares 
   authorized, 14,597,247 and 14,687,394 shares 
   issued and outstanding, respectively...........             15          15
  Additional paid-in capital......................         93,742      93,699
  Common stock warrants...........................            968         968
  Treasury stock..................................            (11)        (11)
  Deferred compensation...........................         (1,949)     (1,448)
  Unrealized loss on investments..................            (75)       (106)
  Deficit accumulated during development stage....        (52,213)    (58,507)
                                                      -----------   ---------
     Total stockholders' equity...................         40,477      34,610
                                                      -----------   ---------
  Total liabilities and stockholders' equity......    $    44,281   $  38,196
                                                      ===========   =========
</TABLE>

  The accompanying notes are an integral part of these financial statements.

                                   - 4-

<PAGE>
<TABLE>


                         ARONEX PHARMACEUTICALS, INC.
                         (A development stage company)


                           STATEMENTS OF OPERATIONS
            (All amounts in thousands, except loss per share data)
                                  (Unaudited)





<CAPTION>
                                                                      
                                                                        Period
                                                                         from
                                                                       Inception
                                                                       (June 13,
                               Six Months Ended    Three Months Ended    1986)
                                    June 30,            June 30,        through
                                                                        June 30,
                                 1996     1997       1996      1997       1997
                               -------   ------    -------    ------    -------
<S>                            <C>       <C>       <C>        <C>       <C>
Revenues:
  Interest income ............ $   470   $1,123    $   328    $  531   $  4,645
  Research and development
    grants and contracts .....   1,008      316        465        30      4,525
                               -------  -------   --------  --------   --------
Total revenues ...............   1,478    1,439        793       561      9,170
                               -------  -------   --------  --------   --------

Expenses:
  Research and development ...   4,845    6,652      2,523     3,167     45,794
  Purchase of in-process
    research and development .     191       --        191        --      8,625
  General and administrative .     771      931        376       475     12,094
  Interest expense and other .      71      150         30       120      1,164
                               -------  -------   --------  --------   --------
Total expenses ..............    5,878    7,733      3,120     3,762     67,677
                               -------  -------   --------  --------   --------
Net loss ....................  $(4,400) $(6,294)  $ (2,327) $ (3,201)  $(58,507)
                               =======  =======   ========  ========   ======== 
 
                       

Loss per share ..............  $ (0.38)  $(0.43)   $ (0.19)   $(0.22)
                                 =====    =====      =====     =====
Weighted average shares used
 in computing loss per share     11,527   14,646     12,404    14,671
</TABLE>













  The accompanying notes are an integral part of these financial statements.

                                   - 5-

<PAGE>
<TABLE>

                         ARONEX PHARMACEUTICALS, INC.
                         (A development stage company)

                           STATEMENTS OF CASH FLOWS
                          (All amounts in thousands)
                                  (Unaudited)
<CAPTION>
                                                                                                          Period from
                                                                                                            Inception
                                                                                                         (June 13, 1986)
                                                                                     Six Months Ended        through
                                                                                          June 30,           June 30,
                                                                                     1996         1997         1997
                                                                                  ----------- ------------   --------

Cash flows from operating activities:
<S>                                                                               <C>           <C>           <C>
  Net loss ..................................................................     $ (4,400)     $ (6,294)     $(58,507)
                                                                                                                      
  Adjustments to reconcile net loss to net cash provided by
   (used in) operating activities-
      Depreciation and amortization .........................................          486           475         3,362
      Loss on disposal of assets ............................................         --             107           107
      Compensation expense related to stock and stock options ...............          303           315         2,957
      Charge for purchase of in-process research and development                       191          --           8,547
              Unrealized gain (loss) on investment                                       8           (31)         (106)
      Acquisition costs, net of cash received ...............................          (26)         --            (270)
      Loss in affiliate .....................................................           50          --             500
      Changes in assets and liabilities:
        Increase in prepaid expenses and other assets .......................         (443)         (178)         (656)
        Decrease in accounts receivable - affiliates ........................          172            78          --
        Increase (decrease) in accounts payable and accrued
             expenses .......................................................         (413)          (63)        1,181
        Increase (decrease) in deferred revenue .............................           50          --            (353)
      Accrued interest payable converted to stock ...........................         --            --              97
                                                                                  --------      --------      --------
            Net cash used in operating activities ...........................       (4,022)       (5,591)      (43,141)

Cash flows from investing activities:
  Net sales (purchases) of investments ......................................      (35,523)        7,976       (23,498)
  Purchase of furniture, equipment and leasehold improvements ...............          (41)         (206)       (3,975)
  Proceeds from sale of assets ..............................................         --              34            34
  Increase in other assets ..................................................         --            (147)         (147)
  Investment in affiliate ...................................................         --            --            (500)
                                                                                  --------      --------      --------
            Net cash provided by (used in) investing activities .............      (35,564)        7,657       (28,086)

Cash flows from financing activities:
  Proceeds from notes payable and capital leases ............................         --            --           4,672
  Repayment of notes payable and principal payments under capital
   lease obligations ........................................................         (411)         (155)       (2,341)
  Purchase of treasury stock ................................................         --            --             (11)
  Proceeds from issuance of stock ...........................................       35,378           143        75,140
                                                                                  --------      --------      --------
            Net cash provided by (used in) financing activities .............       34,967           (12)       77,460
                                                                                  --------      --------      --------
Net increase (decrease) in cash and cash equivalents ........................       (4,619)        2,054         6,233
Cash and cash equivalents at beginning of period ............................        7,781         4,179          --
                                                                                  --------      --------      --------

Cash and cash equivalents at end of period ..................................     $  3,162       $ 6,233      $  6,233
                                                                                  ========       =======      ========


Supplemental disclosures of cash flow information:
  Cash paid during the period for interest ..................................     $    30        $    43      $    891
Supplemental schedule of noncash financing activities:
  Conversion of notes payable and accrued interest to common$stoc$ ..........     $   --         $   --       $  3,043
</TABLE>
  The accompanying notes are an integral part of these financial statements.


                                   - 6-

<PAGE>
                         ARONEX PHARMACEUTICALS, INC.
                         (A development stage company)

                         NOTES TO FINANCIAL STATEMENTS
                                 June 30, 1997
                                  (Unaudited)

1. Organization and Basis of Presentation

   Aronex Pharmaceuticals,  Inc. ("Aronex" or the "Company") was incorporated in
Delaware  on June 13, 1986 and merged with  Triplex  Pharmaceutical  Corporation
("Triplex")  and Oncologix,  Inc.  ("Oncologix")  effective  September 11, 1995.
Aronex is a development stage company which has devoted substantially all of its
efforts to  research  and  product  development  and has not yet  generated  any
significant revenues, nor is there any assurance of significant future revenues.
In addition, the Company expects to continue to incur losses for the foreseeable
future  and  there  can be no  assurance  that the  Company  will  complete  the
transition  from a  development  stage  company to  successful  operations.  The
research and  development  activities  engaged in by the Company  involve a high
degree of risk and  uncertainty.  The  ability of the  Company  to  successfully
develop,  manufacture and market its proprietary products is dependent upon many
factors.  These factors include, but are not limited to, the need for additional
financing,   attracting  and  retaining  key  personnel  and  consultants,   and
successfully  developing  manufacturing,  sales and  marketing  operations.  The
Company's  ability to develop these  operations may be impacted by uncertainties
related  to  patents  and  proprietary  technologies,  technological  change and
obsolescence,  product  development,  competition,  government  regulations  and
approvals, health care reform and product liability exposure.  Additionally, the
Company is reliant upon  collaborative  arrangements  for research,  contractual
agreements with corporate  partners,  and its exclusive license  agreements with
M.D.  Anderson  Cancer Center ("MD Anderson") and an affiliate of Baylor College
of Medicine  ("Baylor").  Further,  during the period  required to develop these
products,  the Company will require  additional funds which may not be available
to it. The Company  expects that its existing cash  resources will be sufficient
to fund its cash  requirements  through mid-1999.  Accordingly,  there can be no
assurance of the Company's future success.

   The balance  sheet at June 30, 1997 and the related  statements of operations
and cash flows for the six month  period  ending  June 30, 1997 and 1996 and the
period from inception (June 13, 1986) through June 30, 1997 are unaudited. These
interim financial statements should be read in conjunction with the December 31,
1996 financial  statements and related notes.  The unaudited  interim  financial
statements  reflect all  adjustments  which are,  in the opinion of  management,
necessary for a fair statement of results for the interim periods  presented and
all such adjustments are of a normal recurring  nature.  Interim results are not
necessarily indicative of results for a full year.

2. Accounting Policies

   In January 1997, the Financial Accounting Standards Board issued Statement of
Financial  Accounting  Standards  No. 128,  "Earnings  per share"  ("SFAS 128").
Management  believes  that this  statement  will have no material  effect on its
financial statements.

3. Cash, Cash Equivalents and Investments

   Cash and cash equivalents  include money market accounts and investments with
an original maturity of less than three months. At June 30, 1997, all short-term
investments are held to maturity securities  consisting of high-grade commercial
paper  and  U.  S.  Government  backed  securities  with  a  carrying  value  of
$25,468,000,   which   approximates  fair  market  value  and  cost.   Long-term
investments  include (i) held to maturity  securities  consisting  of high-grade
commercial  paper that  mature  over one to two years  with a carrying  value of
$2,000,000,  which  approximates  fair market value and cost, and (ii) available
for sale  securities  which are U.S.  mortgage  backed  securities  with various
maturity  dates  over the next  several  years  that have an  amortized  cost of
$1,871,000,  a fair market value of $1,765,000  and a gross  unrealized  loss of
$106,000 at June 30, 1997. The Company currently has no trading securities.



                              

                                      -7-
<PAGE>


                         ARONEX PHARMACEUTICALS, INC.
                         (A development stage company)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

4. Federal Income Taxes

   At  December  31,  1996,   the  Company  had  net   operating   loss  ("NOL")
carryforwards  for federal income tax purposes of  approximately  $66.9 million.
The Tax  Reform  Act of 1986  provided  a  limitation  on the use of NOL and tax
credit  carryforwards  following  certain ownership changes that could limit the
Company's  ability  to  utilize  these NOLs and tax  credits.  Accordingly,  the
Company's  ability to utilize  its NOLs and tax credit  carryforwards  to reduce
future taxable  income and tax  liabilities  may be limited.  As a result of the
1995  mergers  with  Triplex  and  Oncologix  a change in  control as defined by
federal income tax law occurred,  causing the use of these  carryforwards  to be
limited and possibly  eliminated.  Additionally  because U.S. tax laws limit the
time during which NOLs and the tax credit  carryforwards  may be applied against
future taxable income and tax  liabilities,  the Company may not be able to take
full advantage of its NOLs and tax credit  carryforwards  for federal income tax
purposes.  The carryforwards will begin to expire in 2001 if not otherwise used.
A valuation  allowance has been established to offset the Company's deferred tax
assets as the Company has had losses since  inception.  The Company has not made
any income tax payments since inception.

5. Reverse Stock Split

   At a special Meeting of Stockholders held on May 24,1996, the stockholders of
the  Company  approved a  one-for-two  reverse  split of the  Common  Stock (the
"Reverse  Split").  The Reverse  Split  became  effective  with the filing of an
amendment to the Company's  Certificate  of  Incorporation  on July 1, 1996. The
accompanying  financial  statements  have been  restated  to give  effect to the
Reverse Split.

6. Building Lease

   In April 1997, the Company signed a lease for a new building with its current
landlord, under which, the Company has committed to lease 30,000 square feet for
ten years at  approximately  $2.00 per square  foot per month and to pay certain
construction  costs. The Company expects to occupy this lease space late in 1997
or early in 1998.

7. Contingent Stock Rights

   In  connection  with  the  Triplex  merger  agreement,   the  Company  issued
contingent rights (the "Triplex  Contingent Stock Rights") to the former holders
of Triplex  stock and options  entitling  them to receive  additional  shares of
Common Stock upon the occurrence of certain events. The Triplex Contingent Stock
Rights  entitle the former Triplex stock and option holders to receive shares of
Common Stock with an aggregate fair market value at the time of issuance of $5.0
million  (subject to certain  adjustments) if the Company either (i) enters into
an agreement on or before  September  11, 1997 with  respect to the licensing of
ZintevirTM  whereby  the Company  receives  at least $5.0  million in cash or an
unconditional  binding commitment for at least $5.0 million or (ii) obtains data
from  clinical  trials of  ZintevirTM  on or before  September 11, 2000 that the
Company's  Board of Directors  determines  to be  sufficient  to file an NDA. In
addition,  the Triplex  Contingent Stock Rights entitle the former Triplex stock
and option  holders to receive  shares of Common  Stock with an  aggregate  fair
market  value at the time of  issuance of $3.0  million if the Company  does not
receive a minimum of $5.0 million in equity  milestone  payments from Genzyme on
or before September 11, 1997 with respect to the development of AtragenTM. In no
event,  however,  shall more than  3,500,097  shares of Common Stock (subject to
adjustments in the event of stock splits, stock dividends or reclassification of
the Common Stock) be issued pursuant to the Triplex Contingent Stock Rights. The
Company has not  received the minimum  equity  milestone  payments  from Genzyme
contemplated  by the  Triplex  Contingent  Stock  Rights.  The  Company  will be
required to issue  shares of Common Stock under such  contingent  rights with an
aggregate  fair  market  value at the time of issuance  of  $3,000,000  and will
record a corresponding  non-cash research and development  expense of $3,000,000
in the third quarter of 1997 if equity milestone  payments of $5,000,000 are not
received from Genzyme relating to AtragenTM on or before September 11, 1997.


                                      -8-
<PAGE>
 
     Item 2  Management's  Discussion  and Analysis of Financial  Condition  and
Results of Operations

Results of Operations

   Overview

   Since its inception in 1986, Aronex  Pharmaceuticals,  Inc.  ("Aronex" or the
"Company") has primarily devoted its resources to fund research,  drug discovery
and development.  The Company has been unprofitable to date and expects to incur
substantial  operating  losses  for the next  several  years as it  expends  its
resources for product research and development, preclinical and clinical testing
and regulatory  compliance.  The Company has sustained  losses of  approximately
$58.5 million  through June 30, 1997.  The Company has financed its research and
development  activities  and  operations  primarily  through  public and private
offerings  of  securities.  The  Company's  operating  results  have  fluctuated
significantly  during  each  quarter,  and the  Company  anticipates  that  such
fluctuations,  largely  attributable to varying commitments and expenditures for
clinical trials and research and development, will continue for the next several
years.

   Three and Six Month Periods Ended June 30, 1996 and 1997

   Revenues from research and development  grants and contracts were $30,000 and
$465,000  for the three  months  ended June 30, 1997 and 1996,  respectively,  a
decrease  of  $435,000.  Research  and  development  grants and  contracts  were
$316,000  and  $1,008,000  for the six  months  ended  June 30,  1997 and  1996,
respectively, a decrease of $692,000. These decreases were due to the following:
(i) no revenues from Hoechst Marion Roussel,  Inc.  ("Hoechst") in 1997 compared
to $600,000 for the six months ended June 30, 1996, as the agreement  terminated
at the end of 1996; (ii) no Small Business  Innovative  Research  ("SBIR") grant
revenue in 1997  compared to $73,000 for the six months ended June 30, 1996,  as
there  are  currently  no SBIR  grants  in 1997  and  (iii)  a  decrease  in the
development revenue from Targeted Genetics Incorporated ("Targeted") to $150,000
for the six  months  ended June 30,  1997 from  $335,000  for the  corresponding
period in 1996.  This three year  agreement  with  Targeted  ended in the second
quarter of 1997.  The  decreases  in  research  and  development  revenues  were
partially  offset by $150,000 in revenue  received in the first  quarter of 1997
from the Company's license agreement with Boehringer Mannheim GmbH.

   Interest income was $531,000 and $328,000 for the three months ended June 30,
1997 and 1996,  respectively,  an  increase  of  $203,000.  Interest  income was
$1,123,000  and  $470,000  for the six  months  ended  June 30,  1997 and  1996,
respectively,  an increase of $653,000. These increases were primarily due to an
increase of funds available for investment resulting from cash received from the
completion of a stock offering in May 1996.

   Research and  development  expenses were  $3,167,000  and  $2,523,000 for the
three  months  ended  June 30,  1997 and  1996,  respectively,  an  increase  of
$644,000.  Research and development  expenses were $6,652,000 and $4,845,000 for
the six months  ended  June 30,  1997 and 1996,  respectively,  an  increase  of
$1,807,000.  These  increases  were  primarily due to an increase of $756,000 in
medical  affairs and  pharmaceutical  development  salaries  and payroll  costs,
including  costs  relating to the hiring of a Vice  President of  Pharmaceutical
Development  and Operations  and a Senior Vice President of Medical  Affairs and
Chief  Medical  Officer,  an increase of  $789,000 in drug  manufacturing  costs
relating  mainly to  NyotranTM  and  ZintevirTM  and an  increase of $406,000 in
outside  pharmacology  studies  relating mainly to NyotranTM and AtragenTM.  The
increases were partially  offset by a decrease of $287,000 in research  expenses
in the second quarter of 1997 as the majority of the Company's internal research
efforts were eliminated in the second quarter of 1997. The Company's decision to
eliminate  such  research  efforts  was  related in part to the  termination  of
research funding from Hoechst.


                                      -9-
<PAGE>


   In-process research and development  represents costs incurred during the six
month  period  ended  June 30,  1996  related  to the 1995  mergers  of  Triplex
Pharmaceutical  Corporation  ("Triplex") and Oncologix,  Inc.("Oncologix")  with
subsidiaries  of the Company,  and consists of the  settlement of a lawsuit that
had been filed by certain common  stockholders of Oncologix.  In connection with
the Triplex merger,  the Company issued  contingent rights to the former holders
of Triplex  stock and options  entitling  them to receive  additional  shares of
Common Stock upon the occurrence of certain events. The Company will be required
to issue shares of Common Stock under such  contingent  rights with an aggregate
fair  market  value at the time of  issuance  of  $3,000,000  and will  record a
corresponding  non-cash  research and  development  expense of $3,000,000 in the
third  quarter  of 1997 if  equity  milestone  payments  of  $5,000,000  are not
received from Genzyme relating to AtragenTM on or before September 11, 1997. See
Note 7 of Notes to Finanacial Statements.

   General and administrative  expenses were $475,000 and $376,000 for the three
months  ended June 30,  1997 and 1996,  respectively,  an  increase  of $99,000.
General and  administrative  expenses  were  $931,000  and  $771,000 for the six
months  ended June 30, 1997 and 1996,  respectively,  an  increase of  $160,000.
These  increases  were  primarily due to an increase of $106,000 in salaries and
payroll costs,  which includes  several new positions and a related  increase in
operating costs.

   Interest  expense and other was  $120,000  and  $30,000 for the three  months
ended June 30, 1997 and 1996,  respectively,  an  increase of $90,000.  Interest
expense and other was  $150,000  and  $71,000 for the six months  ended June 30,
1997 and 1996, respectively, an increase of $71,000. These increases in interest
expense  and  other  resulted  primarily  from a loss on  disposal  of assets of
$107,000 in the quarter ended June 30, 1997 that relates to the  disposition  of
equipment and leasehold  improvements that had been used in research  activities
that have been  eliminated.  These increases were partially offset by a decrease
in  interest  expense as the amount of  outstanding  debt  which  resulted  from
obtaining  laboratory  equipment through leases and promissory notes payable has
decreased.

   Net loss was  $3,201,000  and  $2,327,000 for the three months ended June 30,
1997 and 1996,  respectively,  an  increase  of  $874,000.  Net loss for the six
months  ended  June  30,  1997  and  1996,  respectively,   was  $6,294,000  and
$4,400,000, an increase of $1,894,000. These increases were primarily due to the
increase in research and development expenses.

Liquidity and Capital Resources

   Since  its  inception,  the  Company's  primary  source of cash has been from
financing  activities,  which  have  consisted  primarily  of  sales  of  equity
securities.  The Company has raised an  aggregate of  approximately  $75 million
from the sale of equity  securities from its inception through June 30, 1997. In
July 1992, the Company raised net proceeds of approximately $10.7 million in the
initial  public  offering of its Common Stock.  In September  1993,  the Company
entered into a collaborative  agreement with Genzyme relating to the development
and  commercialization  of  AtrogenTM,  in  connection  with  which the  Company
received  net  proceeds of  approximately  $4.5  million from the sale of Common
Stock to Genzyme. In November 1993 and May 1996, the Company raised net proceeds
of approximately $11.5 and $32.1 million,  respectively,  in public offerings of
Common  Stock.  From October 1995  through June 30, 1997,  the Company  received
aggregate  net  proceeds of  approximately  $6.5  million  from the  exercise of
certain  warrants  issued  in its 1995  merger  with  Oncologix,  Inc.  From its
inception  until June 30, 1997,  the Company also  received an aggregate of $4.5
million cash from collaborative arrangements and SBIR grants. In September 1995,
the Company's cash and securities  held to maturity  increased by  approximately
$6.7  million  as a  result  of its  1995  merger  with  Triplex  Pharmaceutical
Corporation.


                                      -10-
<PAGE>

   The Company's primary use of cash to date has been in operating activities to
fund  research  and  development,  including  preclinical  studies and  clinical
trials, and general and administrative  expenses.  Cash of $5.6 million and $4.0
million was used in operating activities during the first six months of 1997 and
1996,  respectively.  The Company had cash,  cash-equivalents and short-term and
long-term investments of $35.5 million as of June 30, 1997, consisting primarily
of cash and money market accounts,  and United States government  securities and
investment grade commercial paper.

     The Company has experienced  negative cash flows from operations  since its
inception  and  has  funded  its   activities  to  date  primarily  from  equity
financings. The Company has expended, and will continue to require,  substantial
funds to continue research and development,  including  preclinical  studies and
clinical trials of its products,  and to commence sales and marketing efforts if
FDA and other  regulatory  approvals are obtained.  The Company expects that its
existing capital  resources will be sufficient to fund its capital  requirements
through  mid-1999.  Thereafter,  the  Company  will  need to  raise  substantial
additional  capital to fund its operations.  The Company's capital  requirements
will depend on many  factors,  including  the  problems,  delays,  expenses  and
complications   frequently  encountered  by  development  stage  companies;  the
progress of the Company's research, development and clinical trial programs; the
extent and terms of any future collaborative research, manufacturing,  marketing
or other  funding  arrangements;  the costs and  timing  of  seeking  regulatory
approvals of the Company's products;  the Company's ability to obtain regulatory
approvals;  the success of the Company's sales and marketing programs;  costs of
filing,  prosecuting  and  defending  and  enforcing any patent claims and other
intellectual property rights; and changes in economic, regulatory or competitive
conditions of the Company's  planned  business.  Estimates about the adequacy of
funding for the Company's activities are based on certain assumptions, including
the assumption that testing and regulatory  procedures relating to the Company's
products can be conducted at  projected  costs.  There can be no assurance  that
changes in the Company's research and development plans, acquisitions,  or other
events will not result in accelerated or unexpected expenditures. To satisfy its
capital  requirements,  the  Company may seek to raise  additional  funds in the
public or private capital  markets.  The Company's  ability to raise  additional
funds in the public or private markets will be adversely affected if the results
of its current or future clinical trials are not favorable. The Company may seek
additional   funding  through  corporate   collaborations  and  other  financing
vehicles.  There can be no assurance  that any such funding will be available to
the Company on favorable  terms or at all. If adequate  funds are not available,
the Company may be required to curtail significantly one or more of its research
or  development  programs,  or it  may  be  required  to  obtain  funds  through
arrangements with future  collaborative  partners or others that may require the
Company to relinquish rights to some or all of its technologies or products.  If
the Company is successful in obtaining additional  financing,  the terms of such
financing may have the effect of diluting or adversely affecting the holdings or
the rights of the holders of the Company's Common Stock.


                                      -11-
<PAGE>


PART II.    OTHER INFORMATION

Item 4.  Submission of Matters to a Vote of Security Holders

     The Annual Meeting of the Stockholders of Aronex Pharmaceuticals,  Inc. was
held on May 14, 1997 to consider and vote upon the following proposals:

     (i)  Election  of  Class  II  Directors.  The  following  individuals  were
          nominated  and  elected  as Class  II  directors,  with the  following
          numbers  of  shares  voted  for and  against  and  withheld  for  each
          director:

                                                For              Withheld
              Geoffrey F. Cox, Ph.D.          12,357,339         1,006,593
              Gabriel Lopez-Berestein, M.D.   13,166,801           197,131


                                                 For       Against    Abstain
 
     (ii) Amendment  and  restatement  of 
          Amended and  Restated  1989 Stock
          Option Plan                         7,696,414   2,492,730    38,669

     (iii)Amendment and restatement of  
          Amended and Restated 1993
          Non-Employee Director Stock 
          Option Plan                        10,236,639     513,595    31,494

     (iv) Approval of 1997 Employee Stock 
          Purchase Plan                      10,385,171     368,163    28,394
               
      (v) Amendment of Restated Certificate 
          of Incorporation                   10,086,176      46,788    24,052 

     (vi) Ratification and Selection of 
          Arthur Andersen LLP as Independent 
          Public Accountants                 13,331,146     14,141    18,645





                                      -12-
<PAGE>


Item 6 Exhibits and Reports on Form 8-K

(a)Exhibits

     3.1  Restated Certificate of Incorporation, as amended.

     10.1 Amended and Restated 1989 Stock Option Plan.

     10.2 Amended and Restated 1993 Non-Employee Director Stock Option Plan.

     10.3 Lease  Agreement  dated  April 4, 1997  between  the  Company  and The
          Woodlands Corporation.

     11.1 Statement regarding computation of per share earnings.

     27.1 Financial data schedule.

 (b)Reports on Form 8-K

     None


                                   
                                      -13-
<PAGE>


                                  SIGNATURES

   Pursuant to the  requirements  of the  Securities  Exchange Act of 1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized.



                                      ARONEX PHARMACEUTICALS, INC.




Dated:  August 12, 1997               By:/S/JAMES M. CHUBB
                                         -----------------
                                      James M. Chubb, Ph.D.
                                      President and Chief Executive Officer







Dated:  August 12, 1997               By:/S/TERANCE A. MURNANE
                                         ---------------------
                                      Terance A. Murnane
                                      Controller


     
                                 -14-


                                                                   Exhibit 3.1
                     RESTATED CERTIFICATE OF INCORPORATION

                                      OF

                          ARGUS PHARMACEUTICALS, INC.


      ARGUS PHARMACEUTICALS,  INC. (the "Corporation"),  a corporation organized
and existing under the General  Corporation  Law of the State of Delaware,  does
hereby  certify  that it was  incorporated  on June 13,  1986 as THE  MACROPHAGE
COMPANY.

                                  ARTICLE ONE

      This  Restated  Certificate  of  Incorporation  has been duly  adopted  in
accordance with the applicable provisions of Sections 242 and 245 of the General
Corporation  Law of the State of Delaware (the "DGCL") by the Board of Directors
of the Corporation.

                                  ARTICLE TWO

      This Restated Certificate of Incorporation was approved by written consent
of the stockholders pursuant to Section 228 of the DGCL.

                                 ARTICLE THREE

      The outstanding shares of the Corporation's  common stock, par value $.001
per share ("Old Common  Stock"),  are hereby  reclassified  and  converted  into
shares of the  Corporation's  Common Stock,  par value $.001 per share  ("Common
Stock"),  on the basis of one share of Common  Stock for each 3.3  shares of Old
Common Stock.  The Corporation  shall not issue any fractional  shares of Common
Stock in connection with any of the foregoing reclassification and conversion of
Old Common Stock;  instead,  any fractional  interest in Common Stock  resulting
from application of the specified  reclassification  and conversion ratios shall
be rounded up or down to the  nearest  whole share of Common  Stock,  and in the
event that any fractional  interest is rounded down, there shall be no cash paid
by or to the Corporation in respect of any such fractional interest.

                                 ARTICLE FOUR

      The Certificate of  Incorporation  of this  Corporation and all amendments
thereto  are  hereby  superseded  by  the  following  Restated   Certificate  of
Incorporation  which accurately sets forth the entire text of the Certificate of
Incorporation:

                                   ARTICLE I

                                     NAME

      The name of the Corporation is Argus Pharmaceuticals, Inc.

                                  ARTICLE II

                            REGISTERED OFFICE/AGENT

      The  registered  office of the  Corporation  in the State of  Delaware  is
Corporation Trust Center, 1209 Orange Street, in the City of Wilmington,  County
of New Castle,  Delaware 19801. The name of its registered agent at such address
is The Corporation Trust Company.


                                     -1-

<PAGE>



                                  ARTICLE III

                                   PURPOSES

      The  purposes  of the  Corporation  are to  engage  in any  lawful  act or
activity for which  corporations may be organized under the General  Corporation
Law of the State of Delaware.

                                  ARTICLE IV

                                 CAPITAL STOCK

      A.    Classes of Stock

      The total  number  of shares of all  classes  of  capital  stock  that the
Corporation shall be authorized to issue is 35,000,000 shares,  divided into the
following:  (i) 10,000,000  shares of preferred stock, par value $.001 per share
("Preferred Stock"), and (ii) 25,000,000 shares of common stock, par value $.001
per share ("Common Stock").

      B.    Preferred Stock

      Shares of  Preferred  Stock may be issued from time to time in one or more
series.  The Board of  Directors is hereby  vested with the  authority to fix by
resolution the powers,  designations,  preferences and relative,  participating,
optional and other special rights of each series of Preferred Stock,  including,
without  limitation,  the  dividend  rate,  conversion  rights,  voting  rights,
redemption price and liquidation preference, and the qualifications, limitations
or  restrictions  on such  preferences  and/or  rights  and to fix the number of
shares   constituting  any  such  series.   Unless  otherwise  provided  by  the
resolution(s)  adopted by the Board of Directors  providing for the issue of any
series of Preferred  Stock,  the number of shares  comprising such series may be
increased  or  decreased  (but not below the number of shares then  outstanding)
from time to time by duly adopted resolution(s) of the Board of Directors.

      C.    Common Stock

      Except as otherwise provided in this Restated Certificate of Incorporation
or by law or by the  resolution(s)  of the Board of Directors  providing for the
issue of any series of the Preferred Stock, each holder of Common Stock shall be
entitled  to one vote for each share  held.  Subject to all of the rights of the
Preferred Stock or any series thereof,  the holders of the Common Stock shall be
entitled to receive,  when and as  declared  by the Board of  Directors,  out of
funds legally available therefor, dividends payable in cash, stock or otherwise.
Upon any  liquidation,  dissolution  or winding up of the  Corporation,  whether
voluntary or  involuntary,  and after the holders of the Preferred Stock of each
series shall have been paid in full the amounts to which they respectively shall
be entitled,  or a sum  sufficient for such payments in full shall have been set
aside, the remaining net assets of the Corporation shall he distributed pro rata
to the holders of the Common Stock in accordance  with their  respective  rights
and interest.

                                   ARTICLE V

                              BOARD OF DIRECTORS

      Except as  otherwise  provided  by law,  the  business  and affairs of the
Corporation  shall be  managed  by,  or under  the  direction  of,  its Board of
Directors.  The number of directors of the Corporation shall be fixed by, and in
the manner provided in, the  Corporation's  Bylaws,  but shall not be fewer than
three  nor more  than  15.  None of the  directors  need be a  stockholder  or a
resident of the State of Delaware. Elections of directors need not be by written
ballot unless the Corporation's Bylaws provide otherwise. In furtherance and not
in limitation of the rights,  powers,  privileges  and  discretionary  authority
conferred  by the DGCL or other  applicable  law,  the  Board  of  Directors  is
expressly authorized to adopt, amend or repeal the Bylaws of the Corporation.


                                     -2-

<PAGE>



                                  ARTICLE VI

                                 STOCKHOLDERS

      Stockholder  action may only be taken at an annual or special meeting with
prior notice and a vote. No stockholder  action may be taken by written consent.
Meetings of stockholders  may be held within or without the State of Delaware as
the Bylaws may provide.  In addition to such special meetings as are provided by
law or this  Restated  Certificate  of  Incorporation,  special  meetings of the
stockholders  may be called  only by (a) the Board of  Directors  pursuant  to a
resolution  adopted by a majority of the Board of Directors then in office,  (b)
the  Chairman of the Board,  (c) the  President  of the  Corporation  or (d) the
holders of not less than 30% of the total voting power of all shares of stock of
the Corporation entitled to vote in the election of directors.  The books of the
Corporation  may be kept  (subject to any  provision  contained in the statutes)
outside the State of Delaware at such place(s) as may be designated from time to
time by the Board of Directors or in the Bylaws of the Corporation.

                                  ARTICLE VII

                          LIMITED DIRECTOR LIABILITY

      A  director  of the  corporation  shall  not be  personally  liable to the
Corporation  or its  stockholders  for monetary  damages for breach of fiduciary
duty as a director,  except for liability  (i) for any breach of the  director's
duty of  loyalty  to the  Corporation  or its  stockholders,  (ii)  for  acts or
omissions  not in good  faith  or which  involved  intentional  misconduct  or a
knowing  violation  of law,  (iii) under  Section  174 of the DGCL for  unlawful
payment  of  dividends  or  improper  redemption  of  stock,  or  (iv)  for  any
transaction from which the director derived an improper personal benefit. If the
DGCL is hereafter amended to authorize the further  elimination or limitation of
the liability of directors, then the liability of a director of the Corporation,
in addition to the limitation on personal  liability  provided herein,  shall be
limited to the fullest extent  permitted by the DGCL, as amended.  Any repeal or
modification of this paragraph by the  stockholders of the Corporation  shall be
prospective  only, and shall not adversely affect any limitation on the personal
liability of a director of the  Corporation  existing at the time of such repeal
or modification.

                                 ARTICLE VIII

                                INDEMNIFICATION

      A.    Mandatory Indemnification

      Each person who at any time is or was a director of the  Corporation,  and
is threatened to be or is made a party to any  threatened,  pending or completed
action, suit or proceeding, whether civil, criminal, administrative, arbitrative
or investigative (a "Proceeding"),  by reason of the fact that such person is or
was a director  of the  Corporation,  or is or was serving at the request of the
Corporation  as a director,  officer,  partner,  venturer,  proprietor,  member,
employee,  trustee,  agent or similar functionary of another domestic or foreign
corporation,  partnership,  joint venture, sole proprietorship,  trust, employee
benefit plan or other for-profit or non-profit enterprise,  whether the basis of
a Proceeding is alleged action in such person's  official capacity or in another
capacity while holding such office,  shall be  indemnified  and held harmless by
the  Corporation  to the fullest  extent  authorized  by the DGCL,  or any other
applicable  law as may from time to time be in effect  (but,  in the case of any
such  amendment  or  enactment,  only to the extent that such  amendment  or law
permits the Corporation to provide broader  indemnification rights than such law
prior to such  amendment or enactment  permitted  the  Corporation  to provide),
against all expense,  liability and loss (including,  without limitation,  court
costs and attorneys'  fees,  judgments,  fines,  excise taxes or penalties,  and
amounts paid or to be paid in settlement)  actually and  reasonably  incurred or
suffered   by  such  person  in   connection   with  a   Proceeding,   and  such
indemnification shall continue as to a person who has ceased to be a director of
the Corporation or a director, officer, partner, venturer,  proprietor,  member,
employee,  trustee,  agent or similar functionary of another domestic or foreign
corporation,  partnership,  joint venture, sole proprietorship,  trust, employee
benefit plan or other  for-profit or non-profit  enterprise,  and shall inure to
the  benefit  of  such  person's  heirs,   executors  and  administrators.   The
Corporation's

                                     -3-

<PAGE>



obligations under this Section A include,  but are not limited to, the convening
of any meeting, and the consideration of any matter thereby, required by statute
in order to determine the eligibility of any person for indemnification.

      B.    Prepayment of Expenses

      Expenses  incurred  by a  director  of  the  Corporation  in  defending  a
Proceeding shall be paid by the Corporation in advance of the final  disposition
of such  Proceeding to the fullest  extent  permitted by, and only in compliance
with,  the DGCL or any  other  applicable  laws as may  from  time to time be in
effect, including, without limitation, any provision of the DGCL which requires,
as a  condition  precedent  to such  expense  advancement,  the  delivery to the
Corporation of an  undertaking,  by or on behalf of such director,  to repay all
amounts so advanced if it shall  ultimately be determined  that such director is
not  entitled  to be  indemnified  under  Section  A of  this  Article  VIII  or
otherwise.  Repayments  of all amounts so advanced  shall be upon such terms and
conditions, if any, as the Corporation's Board of Directors deems appropriate.

      C.    Vesting

      The  Corporation's  obligation to indemnify and to prepay  expenses  under
Sections A and B of this Article VIII shall arise, and all rights granted to the
Corporation's  directors  hereunder shall vest, at the time of the occurrence of
the transaction or event to which a Proceeding  relates, or at the time that the
action or conduct to which such Proceeding relates was first taken or engaged in
(or omitted to be taken or engaged in),  regardless  of when such  Proceeding is
first threatened, commenced or completed. Notwithstanding any other provision of
this Certificate of  Incorporation  or the Bylaws of the Corporation,  no action
taken  by  the   Corporation,   either  by  amendment  of  this  Certificate  of
Incorporation  or the Bylaws of the Corporation or otherwise,  shall diminish or
adversely affect any rights to indemnification or prepayment of expenses granted
under  Sections A and B of this Article  VIII which shall have become  vested as
aforesaid  prior to the date that such  amendment or other  corporate  action is
effective or taken, whichever is later.

      D.    Enforcement

      If a claim under  Section A or Section B or both  Sections A and B of this
Article  VIII is not  paid in full by the  Corporation  within  30 days  after a
written claim has been received by the Corporation, the claimant may at any time
thereafter  bring  suit  in  a  court  of  competent  jurisdiction  against  the
Corporation  to recover  the unpaid  amount of the claim and, if  successful  in
whole or in part,  the claimant shall also be entitled to be paid the expense of
prosecuting  such  claim.  It shall be a defense to any such suit  (other than a
suit  brought  to  enforce  a claim  for  expenses  incurred  in  defending  any
Proceeding in advance of its final disposition  where the required  undertaking,
if any is required,  has been tendered to the Corporation) that the claimant has
not met the  standards of conduct  which make it  permissible  under the DGCL or
other  applicable law to indemnify the claimant for the amount claimed,  but the
burden of proving such defense shall be on the  Corporation.  The failure of the
Corporation  (including its Board of Directors,  independent  legal counsel,  or
stockholders)  to have made a  determination  prior to the  commencement of such
suit as to whether indemnification is proper in the circumstances based upon the
applicable  standard  of conduct set forth in the DGCL or other  applicable  law
shall  neither be a defense to the  action  nor  create a  presumption  that the
claimant has not met the applicable standard of conduct.  The termination of any
Proceeding by judgment,  order, settlement,  conviction,  or upon a plea of nolo
contendere or its equivalent,  shall not, of itself,  create a presumption  that
the  person  did  not  act in good  faith  and in a  manner  which  such  person
reasonably  believed  to be in or not  opposed  to  the  best  interests  of the
Corporation,  and, with respect to any criminal Proceeding, had reasonable cause
to believe that his conduct was unlawful.

      E.    Nonexclusive

      The  indemnification  provided  by this  Article  VIII shall not be deemed
exclusive of any other rights to which a person seeking  indemnification  may be
entitled  under any statute,  bylaw,  other  provisions of this  Certificate  of
Incorporation,  agreement,  vote of stockholders or  disinterested  directors or
otherwise, both as to action in such person's official capacity and as to action
in another capacity while holding such office.

                                     -4-

<PAGE>



      F.    Permissive Indemnification

      The  rights  to  indemnification  and  prepayment  of  expenses  which are
conferred  to the  Corporation's  directors  by Sections A and B of this Article
VIII may be conferred upon any officer, employee or agent of the Corporation if,
and to the extent, authorized by the Board of Directors.

      G.    Insurance

      The Corporation  shall have power to purchase and maintain  insurance,  at
its expense, on behalf of any person who is or was a director, officer, employee
or  agent  of the  Corporation,  or is or was  serving  at  the  request  of the
Corporation  as a director,  officer,  partner,  venturer,  proprietor,  member,
employee,  trustee,  agent or similar functionary of another domestic or foreign
corporation,  partnership,  joint venture, sole proprietorship,  trust, employee
benefit plan or other for-profit or non-profit  enterprise  against any expense,
liability  or loss  asserted  against such person and incurred by such person in
any such capacity,  or arising out of such person's  status as such,  whether or
not the  Corporation  would have the power to indemnify such person against such
expense,  liability or loss under the  Corporation's  Bylaws,  the provisions of
this Article VIII, the DGCL or other applicable law.

                                  ARTICLE IX

                                  COMPROMISE

      Whenever a compromise or arrangement is proposed  between this Corporation
and its creditors or any class of them and/or between this  Corporation  and its
stockholders  or any class of them, any court of equitable  jurisdiction  within
the  State  of  Delaware  may,  on the  application  in a  summary  way of  this
Corporation or of any creditor or stockholder  thereof or on the  application of
any receiver or receivers appointed for this Corporation under the provisions of
section 291 of Title 8 of the Delaware Code or on the application of trustees in
dissolution or of any receiver or receivers appointed for this Corporation under
the provisions of section 279 of Title 8 of the Delaware Code order a meeting of
the  creditors or class of  creditors,  and/or of the  stockholders  or class of
stockholders  of this  Corporation,  as the case may be, to be  summoned in such
manner  as  the  said  court  directs.  If a  majority  in  number  representing
three-fourths  in value of the  creditors or class of  creditors,  and/or of the
stockholders or class of stockholders of this  Corporation,  as the case may be,
agree  to any  compromise  or  arrangement  and to any  reorganization  of  this
Corporation  as  consequence  of  such  compromise  or  arrangement,   the  said
compromise or arrangement  and the said  reorganization  shall, if sanctioned by
the court to which the said  application  has been  made,  be binding on all the
creditors  or  class  of  creditors,  and/or  on all  stockholders  or  class of
stockholders,  of  this  Corporation,  as the  case  may  be,  and  also on this
Corporation.


                                     -5-

<PAGE>



      IN WITNESS WHEREOF, Argus  Pharmaceuticals,  Inc. has caused this Restated
Certificate of  Incorporation to be signed by its Vice President and attested to
by its Secretary and Controller this 24th day of June, 1992.



                                          /s/ Kenneth M. Cohen
                                              ----------------
                                          Kenneth M. Cohen,

                                          Vice President


Acknowledged this 24th day of June, 1992.


/s/ Terance A. Murnane
Terance A. Murnane,
Secretary and Controller



STATE OF TEXAS          ss.
                        ss.
COUNTY OF HARRIS        ss.

      I, Rosa L. Williams, a notary public, in and for Harris County,  Texas, do
hereby  certify  that on this the 24th day of June,  1992,  personally  appeared
before me, Kenneth M. Cohen, who being by me duly sworn, declared that he is the
person who signed the foregoing  Restated  Certificate of Incorporation of Argus
Pharmaceuticals,  Inc. as Vice President of Argus Pharmaceuticals,  Inc., as the
act and deed of such corporation,  and that the statements contained therein are
true.

      GIVEN UNDER MY HAND AND SEAL OF OFFICE, this the 24th day of June, 1992.



                                          /s/ Rosa L. Williams
                                              ----------------
                                          Notary Public in and for the
                                          State of Texas

                                     -6-

<PAGE>



                           CERTIFICATE OF AMENDMENT
                                      TO
               AMENDED AND RESTATED CERTIFICATE OF INCORPORATION
                                      OF
                          ARGUS PHARMACEUTICALS, INC.


      Argus  Pharmaceuticals,  Inc., a corporation  organized and existing under
and by virtue of the  General  Corporation  Law of the  State of  Delaware  (the
"Corporation"),

DOES HEREBY CERTIFY:

      FIRST:  That a  meeting  of the  Board of  Directors  of the  Corporation,
resolutions were duly adopted setting forth a proposed  amendment of the Amended
and Restated  Certificate of Incorporation  of the  Corporation,  declaring said
amendment  to be  advisable  and  calling a meeting of the  stockholders  of the
Corporation for consideration thereof.
The resolution setting forth the proposed amendment is as follows:

      RESOLVED,  that the Amended and Restated  Certificate of  Incorporation of
      the  Corporation  be amended to change  each of Article I,  Article IV and
      Article V thereto, so that as amended,

      Article I shall be and read as follows:

                                   ARTICLE I
                                     NAME

      The name of the Corporation is Aronex Pharmaceuticals, Inc.

      Article IV shall be and read as follows:

                                  ARTICLE IV
                                 CAPITAL STOCK

      A.    Classes of Stock

            The total number of shares of all classes of capital  stock that the
      Corporation  shall be authorized to issue is  85,000,000  shares,  divided
      into the following:  (i) 10,000,000  shares of preferred  stock, par value
      $.001 per share ("Preferred  Stock"), and (ii) 75,000,000 shares of common
      stock, par value $.001 per share ("Common Stock").

      B.    Preferred Stock

            Shares of Preferred  Stock may be issued from time to time in one or
      more series. The Board of Directors is hereby vested with the authority to
      fix by  resolution  the powers,  designations,  preferences  and relative,
      participating,  optional  and  other  special  rights  of each  series  of
      Preferred  Stock,  including,   without  limitation,  the  dividend  rate,
      conversion  rights,  voting  rights,   redemption  price  and  liquidation
      preference,  and the  qualifications,  limitations or restrictions on such
      preferences and/or rights and to fix the number of shares constituting any
      such series. Unless otherwise provided by the resolution(s) adopted by the
      Board of  Directors  providing  for the issue of any  series of  Preferred
      Stock,  the number of shares  comprising  such series may be  increased or
      decreased (but not below the number of shares then  outstanding) from time
      to time by duly adopted resolution(s) of the Board of Directors.


                                     -1-

<PAGE>



      C.    Common Stock

            Except  as   otherwise   provided  in  this   Amended  and  Restated
      Certificate  of  Incorporation  or by law or by the  resolution(s)  of the
      Board of Directors  providing for the issue of any series of the Preferred
      Stock,  each holder of Common Stock shall be entitled to one vote for each
      share  held.  Subject to all of the rights of the  Preferred  Stock or any
      series  thereof,  the  holders of the Common  Stock  shall be  entitled to
      receive,  when and as  declared  by the Board of  Directors,  out of funds
      legally available therefor, dividends payable in cash, stock or otherwise.
      Upon  any  liquidation,  dissolution  or  winding  up of the  Corporation,
      whether  voluntary or involuntary,  and after the holders of the Preferred
      Stock of each  series  shall  have been paid in full the  amounts to which
      they respectively shall be entitled, or a sum sufficient for such payments
      in full  shall  have  been set  aside,  the  remaining  net  assets of the
      Corporation  shall be  distributed  pro rata to the  holders of the Common
      Stock in accordance with their respective rights and interest.

      Article V shall be and read as follows:

                                   ARTICLE V
                              BOARD OF DIRECTORS

      A.    Classification

            Except as otherwise provided by law, the business and affairs of the
      Corporation  shall be managed by, or under the  direction of, its Board of
      Directors.  The Board of Directors  shall be divided  into three  classes,
      Class I, Class II and Class III,  which shall be as nearly equal in number
      as possible.  At the annual meeting of stockholders to be held in 1995, or
      any special  meeting  held in lieu  thereof,  Class I  Directors  shall be
      elected for a term expiring at the annual  meeting of  stockholders  to be
      held in 1998,  Class II Directors  shall be elected for a term expiring at
      the  annual  meeting  of  stockholders  to be held in 1997,  and Class III
      Directors  shall be elected for a term  expiring at the annual  meeting of
      stockholders  to be held in 1996,  with each director to hold office until
      his or her successor is elected and  qualified.  At each annual meeting of
      stockholders  subsequent  to  1995,  the  successor(s)  of  the  class  of
      directors  whose term expires at that annual  meeting  shall be elected to
      hold office for a term expiring at the annual meeting of  stockholders  to
      be held in the third year following the year of such director's  election.
      None of the directors  need be a stockholder or a resident of the State of
      Delaware.  The election of directors  need not be by written ballot unless
      so  provided  in the  Corporation's  Bylaws.  No decrease in the number of
      directors  constituting  the Board of Directors  shall shorten the term of
      any  incumbent  director.  Any newly  created or  eliminated  directorship
      resulting from an increase or decrease in the Board of Directors  shall be
      appointed by the Board of Directors  among the three  classes of directors
      so as to maintain such classes as nearly equal as possible. In furtherance
      and not in limitation of the rights, powers,  privileges and discretionary
      authority  conferred by the DGCL,  or other  applicable  law, the Board of
      Directors is expressly  authorized to adopt, amend or repeal the Bylaws of
      the Corporation.

      B.    Vacancies

            Except  as  otherwise  provided  for in this  Amended  and  Restated
      Certificate  of  Incorporation,  vacancies  resulting  from  newly-created
      directorships,  death, resignation, removal or other cause shall be filled
      only by the affirmative vote of a majority of the remaining directors then
      in office, even though less than a quorum of the Board of Directors, or by
      a sole remaining  director.  Any director  elected in accordance  with the
      preceding  sentence of this Article V shall hold office for the  remainder
      of the full term of the class of directors  in which the new  directorship
      was created or the vacancy occurred until such director's  successor shall
      have been elected and qualified.


                                     -2-

<PAGE>



      C.    Removal

            Any  director  may be removed from office only for cause and only by
      either the  affirmative  vote of a majority  of the  continuing  directors
      other than such director, or by the affirmative vote of the holders of 80%
      of the then  outstanding  shares of each class of stock of the Corporation
      having voting power for the election of directors.

      SECOND: That thereafter, pursuant to resolution of its Board of Directors,
a special  meeting of the  stockholders  of the  Corporation was duly called and
held, upon notice in accordance with Section 222 of the General  Corporation law
of the State of Delaware  at which  meeting  the  necessary  number of shares as
required by statute were voted in favor of the amendment.

     THIRD:  That  said  amendment  was  duly  adopted  in  accordance  with the
provisions  of  Section  242 of the  General  Corporation  Law of the  State  of
Delaware.

      IN WITNESS  WHEREOF,  the  Corporation  has caused this  certificate to be
signed by David M. Leech, its President and Chief Executive  Officer and Terance
A. Murnane, its Controller and Secretary, this 11th day of September, 1995.


                                          /s/ David M. Leech
                                              --------------
                                          David M. Leech, President
                                            and Chief Executive Officer


ATTEST:/s/ Terance A. Murnane
           ------------------
         Terance A. Murnane,
         Controller and Secretary


                                     -3-

<PAGE>



                           CERTIFICATE OF AMENDMENT
                                      OF
              AMENDED AND RESTATED CERTIFICATE OF INCORPORATION
                                      OF
                         ARONEX PHARMACEUTICALS, INC.


     Aronex  Pharmaceuticals,  Inc. (the "Corporation"),  organized and existing
under and by virtue of the General Corporation Law of the State of Delaware (the
"DGCL") does hereby certify:

      FIRST:  That the  Board  of  Directors  of the  Corporation  duly  adopted
resolutions  setting forth the  following  amendment to the Amended and Restated
Certificate of Incorporation of the Corporation (the "Amendment"), declaring the
Amendment  to be  advisable  and  calling  for the  submission  of the  proposed
Amendment to the stockholders of the Corporation for consideration  thereof. The
resolution setting forth the proposed Amendment is as follows:

      ARTICLE IV of the Amended and Restated  Certificate  of  Incorporation  of
Aronex  Pharmaceuticals,  Inc.,  a Delaware  corporation,  is hereby  amended by
adding thereto new Section D to read as follows:

      D. Reverse Split

      (i)Effective  immediately upon the filing of this Amendment to the Amended
and Restated  Certificate  of  Incorporation  in the office of the  Secretary of
State of the State of Delaware,  each outstanding  share of previously  existing
Common Stock shall be and hereby is converted into and  reclassified as one-half
of a share of Common Stock; provided,  however, that fractional shares of Common
Stock will not be issued and each holder of a  fractional  share of Common Stock
shall receive in lieu thereof a cash payment from the Corporation  determined by
multiplying  such  fractional  share of Common  Stock by two  times the  average
closing  price of a share of  previously  existing  Common  Stock on the  Nasdaq
National  Market for the five trading days  immediately  preceding the effective
date,  and upon such other terms as the  officers of the  Corporation,  in their
sole  discretion,  deem  to be  advisable  and  in  the  best  interests  of the
Corporation.

      (ii) Certificates representing reclassified shares are hereby canceled and
upon presentation of the canceled  certificates to the Corporation,  the holders
thereof shall be entitled to receive certificate(s)  representing the new shares
into which such canceled shares have been converted.

      SECOND:  That  thereafter  pursuant  to  a  resolution  of  the  Board  of
Directors,  a special  meeting of the  stockholders  of the Corporation was duly
called and held, upon notice in accordance with Section 222 of the DGCL at which
meeting the  necessary  number of shares as  required  by statute  were voted in
favor of the Amendment.

     THIRD:  That  the  Amendment  was  duly  adopted  in  accordance  with  the
provisions of Section 242 of the DGCL.

     FOURTH:  That the Amendment shall be effective on the date this Certificate
of  Amendment  is filed and  accepted by the  Secretary of State of the State of
Delaware.



                                     -1-

<PAGE>



      IN WITNESS  WHEREOF,  the  Corporation  has caused this  certificate to be
signed by James M. Chubb, its President, and attested by Terance A. Murnane, its
Secretary, this 28th day of June, 1996.


                                    ARONEX PHARMACEUTICALS, INC.



                                    By:   /s/ James M. Chubb
                                              --------------
                                          James M. Chubb
                                          President


Attest:/s/ Terance A. Murnane
           ------------------
      Terance A. Murnane
      Secretary

                                     -2-

<PAGE>




                           CERTIFICATE OF AMENDMENT
                                      OF
              AMENDED AND RESTATED CERTIFICATE OF INCORPORATION
                                      OF
                         ARONEX PHARMACEUTICALS, INC.


     Aronex  Pharmaceuticals,  Inc. (the "Corporation"),  organized and existing
under and by virtue of the General Corporation Law of the State of Delaware (the
"DGCL") does hereby certify:

      FIRST:  That the  Board  of  Directors  of the  Corporation  duly  adopted
resolutions  setting forth the  following  amendment to the Amended and Restated
Certificate of Incorporation of the Corporation (the "Amendment"), declaring the
Amendment  to be  advisable  and  calling  for the  submission  of the  proposed
Amendment to the stockholders of the Corporation for consideration  thereof. The
resolution setting forth the proposed Amendment is as follows:

      ARTICLE IV of the Amended and Restated  Certificate  of  Incorporation  of
Aronex  Pharmaceuticals,  Inc.,  a Delaware  corporation,  is hereby  amended by
deleting Section A, and inserting the following as Section A:

      A. Classes of Stock

         The  number  of  shares  of all  classes  of  capital  stock  that  the
Corporation shall be authorized to issue is 35,000,000 shares,  divided into the
following:  (i) 5,000,000  shares of preferred  stock, par value $.001 per share
("Preferred Stock"), and (ii) 30,000,000 shares of common stock, par value $.001
per share ("Common Stock")

      SECOND:  That  thereafter  pursuant  to  a  resolution  of  the  Board  of
Directors,  a special  meeting of the  stockholders  of the Corporation was duly
called and held, upon notice in accordance with Section 222 of the DGCL at which
meeting the  necessary  number of shares as  required  by statute  were voted in
favor of the Amendment.

     THIRD:  That  the  Amendment  was  duly  adopted  in  accordance  with  the
provisions of Section 242 of the DGCL.

     FOURTH:  That the Amendment shall be effective on the date this Certificate
of  Amendment  is filed and  accepted by the  Secretary of State of the State of
Delaware.

      IN WITNESS  WHEREOF,  the  Corporation  has caused this  certificate to be
signed by James M. Chubb, its President, and attested by Terance A. Murnane, its
Secretary, this 14th day of May, 1997.


                              ARONEX PHARMACEUTICALS, INC.



                              By:   /s/ James M. Chubb
                                        --------------
                                    James M. Chubb
                                    President

ATTEST:/s/ Terance A. Murnane
           ------------------
          Terance A. Murnane
          Secretary





                                                                  Exhibit 10.1
                         ARONEX PHARMACEUTICALS, INC.
                  AMENDED AND RESTATED 1989 STOCK OPTION PLAN


      1. Purpose of the Plan

      This Aronex  Pharmaceuticals,  Inc. Amended and Restated 1989 Stock Option
Plan is intended  to promote  the  interests  of the  Company by  providing  the
employees and  consultants of the Company,  who are largely  responsible for the
management,  growth  and  protection  of the  business  of the  Company,  with a
proprietary interest in the Company.

      2. Definitions

      As  used  in the  Plan,  the  following  definitions  apply  to the  terms
indicated below:

          (a)"Board  of  Directors"  shall mean the Board of Directors of Aronex
     Pharmaceuticals, Inc.

          (b)"Cause,"  when  used  in  connection  with  the  termination  of  a
     Participant's  employment  with the Company,  shall mean the termination of
     the Participant's employment by the Company by reason of (i) the conviction
     of the  Participant  of a crime  involving  moral  turpitude  by a court of
     competent jurisdiction as to which no further appeal can be taken; (ii) the
     proven  commission by the  Participant of an act of fraud upon the Company;
     (iii) the willful and proven  misappropriation  of any funds or property of
     the  Company  by  the   Participant;   (iv)  the  willful,   continued  and
     unreasonable  failure by the  Participant to perform duties assigned to him
     and agreed to by him; (v) the knowing  engagement by the Participant in any
     direct,  material conflict of interest with the Company without  compliance
     with the  Company's  conflict of interest  policy,  if any, then in effect;
     (vi)  the  knowing  engagement  by the  Participant,  without  the  written
     approval of the Board of Directors of the  Company,  in any activity  which
     competes  with the  business  of the  Company  or which  would  result in a
     material  injury to the  Company;  or (vii) the knowing  engagement  in any
     activity which would  constitute a material  violation of the provisions of
     the Company's  Insider  Trading Policy or Business  Ethics Policy,  if any,
     then in effect.

          (c)"Change  in  Control"  shall  mean  the  occurrence  of  any of the
     following events:

            (i) any Person  becomes,  after the effective date of this Plan, the
         "beneficial  owner" (as  defined in Rule  13d-3  promulgated  under the
         Exchange  Act),  directly or  indirectly,  of securities of the Company
         representing  30% or more of the combined voting power of the Company's
         then outstanding securities;

            (ii)  Individuals who constitute the Incumbent Board cease,  for any
         reason,  to  constitute  at least a majority of the Board of Directors;
         provided,  however,  that any person becoming a director  subsequent to
         the Effective  Date who was nominated for election by at least 66 2/3 %
         of the  Incumbent  Board (other than the  nomination  of an  individual
         whose initial  assumption of office is in connection  with an actual or
         threatened  election  contest  relating to the election of the Board of
         Directors,  as such  terms are used in Rule  14a-11 of  Regulation  14A
         promulgated  under the  Exchange  Act) shall be, for  purposes  of this
         Plan, considered a member of the Incumbent Board;

            (iii) the Board of  Directors  determines  in its sole and  absolute
         discretion that there has been a change in control of the Company.

          (d)"Code"  shall mean the Internal  Revenue  Code of 1986,  as amended
     from time to time.

          (e)"Committee"  shall mean the Compensation  Committee of the Board of
     Directors or such other  committee as the Board of Directors  shall appoint
     from time to time to administer the Plan.

                                     -1-

<PAGE>




          (f)"Common  Stock" shall mean the Company's  common  stock,  $.001 par
     value per share.

          (g)"Company"  shall  mean  Aronex  Pharmaceuticals,  Inc.,  a Delaware
     corporation, and each of its Subsidiaries, and its successors.

          (h)"Consultant" shall mean any person who is engaged by the Company or
     any Parent or Subsidiary to render  consulting  services and is compensated
     for such consulting services.

          (i)"Disability"  shall mean the physical or mental  disability  of the
     Participant to such an extent that the Participant is unable  substantially
     to  perform  his or her  usual  duties  at the  Company  for a period of 60
     consecutive days, or a written certification by two doctors selected by the
     Participant   and  acceptable  to  the  Company  that  the  Participant  is
     substantially unable to perform such duties.

          (j)"Effective  Date"  shall  mean  the  date  upon  which  the Plan is
     approved by the affirmative  vote of the holders of the requisite  majority
     of the outstanding shares of the Company's capital stock.

          (k)"Employee"  shall mean any person  employed  by the  Company or any
     Parent or Subsidiary of the Company. The payment of a director's fee by the
     Company shall not be sufficient to constitute "employment" by the Company.

          (l)"Exchange  Act" shall mean the Securities  Exchange Act of 1934, as
     amended from time to time.

          (m)the  "Fair  Market  Value" of a share of  Common  Stock on any date
     shall be (i) the closing sales price on the immediately  preceding business
     day of a share of Common  Stock as  reported  on the  principal  securities
     exchange  on which  shares of Common  Stock are then  listed or admitted to
     trading or (ii) if not so  reported,  the  average of the  closing  bid and
     asked  prices  for a share of  Common  Stock on the  immediately  preceding
     business day as quoted on the National  Association  of Securities  Dealers
     Automated Quotation System ("NASDAQ") or (iii) if not quoted on NASDAQ, the
     average of the closing bid and asked  prices for a share of Common Stock as
     quoted by the National  Quotation  Bureau's  "Pink  Sheets" or the National
     Association of Securities  Dealers' OTC Bulletin Board System. If the price
     of a share of Common Stock shall not be so reported,  the Fair Market Value
     of a share of Common  Stock shall be  determined  by the  Committee  in its
     absolute discretion.

          (n)"Incentive Award" shall mean an Option, a grant of Restricted Stock
     or a Stock Bonus granted pursuant to the terms of the Plan.

          (o)"Incentive   Stock  Option"  shall  mean  an  Option  which  is  an
     "incentive  stock option" within the meaning of Section 422 of the Code and
     which is identified as an Incentive  Stock Option in the agreement by which
     it is evidenced.

          (p)"Incumbent  Board" shall mean the Board of Directors as constituted
     on the Effective Date.

          (q)"Issue  Date" shall mean the date  established  by the Committee on
     which certificates  representing shares of Restricted Stock shall be issued
     by the Company pursuant to the terms of Section 7(d) hereof.

          (r)"Non-Qualified  Stock  Option" shall mean an Option which is not an
     Incentive  Stock Option and which is  identified as a  Non-Qualified  Stock
     Option in the agreement by which it is evidenced.

          (s)"Option" shall mean an option to purchase shares of Common Stock of
     the  Company  granted  pursuant to Section 6 hereof.  Each Option  shall be
     identified  either as an Incentive  Stock Option or a  Non-Qualified  Stock
     Option in the agreement by which it is evidenced.

                                     -2-

<PAGE>




          (t)"Parent"  shall  mean  a  "parent   corporation,"  whether  now  or
     hereafter existing, as defined in Section 425(e) of the Code.

          (u)"Participant"  shall mean an employee or  consultant of the Company
     who is eligible to participate  in the Plan and to whom an Incentive  Award
     is granted  pursuant to the Plan and his successors,  heirs,  executors and
     administrators, as the case may be, to the extent permitted hereby.

          (v)"Person"  shall mean a  "person,"  as such term is used in Sections
     13(d) and 14(d) of the  Exchange  Act,  and the  rules and  regulations  in
     effect from time to time thereunder.

          (w)"Plan" shall mean this Amended and Restated 1989 Stock Option Plan,
     as it may be amended from time to time.

          (x)"Qualified   Domestic  Relations  Order"  shall  mean  a  qualified
     domestic relations order as defined in the Code, in Title I of the Employee
     Retirement  Income  Security Act, or in the rules and regulations as may be
     in effect from time to time thereunder.

          (y)"Regulations"  shall mean all regulations  promulgated  pursuant to
     the Code.

          (z)"Restricted  Stock"  shall  mean a share of Common  Stock  which is
     granted  pursuant to the terms and subject to the restrictions set forth in
     Section 7 hereof.

          (aa)"Securities Act" shall mean the Securities Act of 1933, as amended
     from time to time.

          (ab)"Stock  Bonus" shall mean a grant of a bonus  payable in shares of
     Common Stock pursuant to Section 8 hereof.

          (ac)"Subsidiary" or "Subsidiaries" shall mean any and all corporations
     in which at the pertinent  time the Company owns,  directly or  indirectly,
     stock  vested  with more than fifty  percent of the total  combined  voting
     power of all classes of stock of such corporation.

          (ad)"Vesting Date" shall mean the date established by the Committee on
     which a share of Restricted Stock may vest.

      3. Stock Subject to the Plan

      Under the Plan, the Committee may grant to Participants (i) Options,  (ii)
Restricted Stock, and/or (iii) Stock Bonuses.

      The Committee  may grant  Options,  shares of  Restricted  Stock and Stock
Bonuses  under the Plan with  respect to a number of shares of Common Stock that
in the aggregate  does not exceed the greater of (i)  2,490,000  shares and (ii)
ten percent of the issued and outstanding  shares of Common Stock  determined as
of the close of business on the last day of the preceding  fiscal quarter of the
Company.  The  Company  will,  during  the term of this Plan,  reserve  and keep
available for issuance a sufficient  number of shares of Common Stock to satisfy
the requirements of the Plan.

      The total number of shares of Common Stock with respect to which Incentive
Stock Options may be granted under the Plan shall be 2,490,000  shares,  subject
to adjustment on the same basis as outstanding  Options are adjusted pursuant to
Section 9(b).


                                     -3-

<PAGE>



      The maximum  number of shares of Common Stock subject to Options which may
be issued to any  Participant  during any period of three  consecutive  years is
500,000 shares,  subject to adjustment on the same basis as outstanding  Options
are adjusted pursuant to Section 9(b).

      If any  outstanding  Option  expires,  terminates  or is canceled  for any
reason,  the shares of Common Stock subject to the  unexercised  portion of such
Option  shall  again be  available  for grant  under the Plan.  If any shares of
Restricted  Stock or any shares of Common  Stock  granted  in a Stock  Bonus are
forfeited or canceled for any reason,  such shares shall again be available  for
grant under the Plan.

      Shares of Common Stock issued under the Plan may be either newly issued or
treasury shares, at the discretion of the Committee.

      4. Administration of the Plan

      The Plan shall be  administered  by the Committee,  which shall consist of
two or more persons each of whom shall be a "non-employee  director"  within the
meaning of Rule l6b-3(b)(3)(i)  promulgated under Section 16 of the Exchange Act
and an "outside  director" within the meaning of Section 162(m) of the Code. The
Committee  shall  from  time to time  designate  the  Participants  who shall be
granted Incentive Awards and the amount and type of such Incentive Awards.

      The Committee shall have full authority to administer the Plan,  including
authority to interpret  and construe any  provision of the Plan and the terms of
any Incentive  Award issued under it and to adopt such rules and regulations for
administering  the Plan as it may deem  necessary.  Decisions  of the  Committee
shall be final and binding on all parties.

      The Committee  may, in its absolute  discretion (i) accelerate the date on
which any Option  granted  under the Plan becomes  exercisable,  (ii) extend the
date on which any Option  granted  under the Plan  ceases to be  exercisable  or
(iii) accelerate the Vesting Date or Issue Date, or waive any condition  imposed
pursuant to Section 7(b) hereof,  with respect to any share of Restricted  Stock
granted under the Plan.

      In  addition,  the  Committee  may,  in  its  absolute  discretion,  grant
Incentive  Awards  to  Participants  on the  condition  that  such  Participants
surrender  to  the  Committee  for  cancellation  such  other  Incentive  Awards
(including, without limitation, Incentive Awards with higher exercise prices) as
the Committee  specifies.  Notwithstanding  Section 3 hereof,  Incentive  Awards
granted on the condition of surrender of outstanding  Incentive Awards shall not
count  against  the limits  set forth in such  Section 3 until such time as such
Incentive Awards are surrendered.

      Whether  an  authorized  leave  of  absence  or  absence  in  military  or
government   service  shall  constitute   termination  of  employment  shall  be
determined by the Committee in its absolute discretion.

      No member of the Committee  shall be liable for any action,  omission,  or
determination  relating to the Plan,  and the Company  shall  indemnify and hold
harmless each member of the Committee and each other director or employee of the
Company  to  whom  any  duty  or  power  relating  to  the   administration   or
interpretation  of the Plan  has been  delegated  from and  against  any cost or
expense  (including  attorneys'  fees) or liability  (including  any sum paid in
settlement  of a claim with the  approval of the  Committee)  arising out of any
action,  omission or determination relating to the Plan, unless, in either case,
such  action,  omission  or  determination  was  taken  or made by such  member,
director or employee in bad faith and without  reasonable  belief that it was in
the best interests of the Company.

      5. Eligibility

      All Employees and  Consultants of the Company shall be eligible to receive
Incentive Awards pursuant to the Plan; however, Incentive Stock Options may only
be granted to Employees of the Company.


                                     -4-

<PAGE>



      6. Options

      The Committee may grant Options  pursuant to the Plan, which Options shall
be evidenced by agreements in such form as the Committee shall from time to time
approve.  Options  shall comply with and be subject to the  following  terms and
conditions:

         (a)Identification of Options

         All Options  granted under the Plan shall be clearly  identified in the
      agreement  evidencing such Options as either Incentive Stock Options or as
      Non-Qualified Stock Options.

         (b)Exercise Price

         The exercise price of any Non-Qualified  Stock Option granted under the
      Plan shall be such price as the Committee  shall  determine on the date on
      which such  Non-Qualified  Stock  Option is granted;  provided,  that such
      price may not be less than the minimum  price  required by law.  Except as
      provided in Section 6(d) hereof, the exercise price of any Incentive Stock
      Option  granted  under  the Plan  shall be not less  than 100% of the Fair
      Market  Value  of a share  of  Common  Stock  on the  date on  which  such
      Incentive Stock Option is granted.

         (c)Term and Exercise of Options

            (1) Each Option shall be exercisable  on such date or dates,  during
         such period and for such  number of shares of Common  Stock as shall be
         determined  by the Committee on the day on which such Option is granted
         and  set  forth  in the  agreement  evidencing  the  Option;  provided,
         however,  that (A) no Incentive Stock Option shall be exercisable after
         the expiration of seven years from the date such Incentive Stock Option
         was granted, and (B) no Non-Qualified Stock Option shall be exercisable
         after  the  expiration  of seven  years  and one day from the date such
         Non-Qualified Stock Option was granted;  and, provided,  further,  that
         each  Option  shall be subject to earlier  termination,  expiration  or
         cancellation as provided in the Plan.

            (2) Each  Option  shall  be  exercisable  in  whole or in part  with
         respect to whole  shares of Common  Stock.  The partial  exercise of an
         Option shall not cause the  expiration,  termination or cancellation of
         the remaining portion thereof.  Upon the partial exercise of an Option,
         the  agreement   evidencing  such  Option  shall  be  returned  to  the
         Participant  exercising  such Option  together with the delivery of the
         certificates described in Section 6(c)(5) hereof.

            (3) An  Option  shall  be  exercised  by  delivering  notice  to the
         Company's principal office, to the attention of its Secretary, no fewer
         than  five  business  days  in  advance  of the  effective  date of the
         proposed  exercise.  Such notice shall be  accompanied by the agreement
         evidencing  the  Option,  shall  specify the number of shares of Common
         Stock  with  respect  to which the  Option is being  exercised  and the
         effective  date of the  proposed  exercise,  and shall be signed by the
         Participant. The Participant may withdraw such notice at any time prior
         to the close of business on the business day immediately  preceding the
         effective date of the proposed  exercise,  in which case such agreement
         shall be  returned  to the  Participant.  Payment  for shares of Common
         Stock  purchased  upon the  exercise of an Option  shall be made on the
         effective date of such exercise either (i) in cash, by certified check,
         bank  cashier's  check or wire transfer or (ii) subject to the approval
         of the  Committee,  in shares of Common Stock owned by the  Participant
         and valued at their Fair  Market  Value on the  effective  date of such
         exercise, or partly in shares of Common Stock with the balance in cash,
         by certified check, bank cashier's check or wire transfer.  Any payment
         in shares of Common  Stock shall be  effected  by the  delivery of such
         shares to the  Secretary  of the  Company,  duly  endorsed  in blank or
         accompanied  by stock powers duly executed in blank,  together with any
         other  documents  and  evidences as the  Secretary of the Company shall
         require from time to time.


                                     -5-

<PAGE>



            (4)  Any  Option  granted  under  the  Plan  may be  exercised  by a
         broker-dealer   acting  on  behalf   of  a   Participant   if  (i)  the
         broker-dealer  has received from the  Participant or the Company a duly
         endorsed  agreement  evidencing such Option and instructions  signed by
         the Participant  requesting the Company to deliver the shares of Common
         Stock  subject  to such  Option to the  broker-dealer  on behalf of the
         Participant and specifying the account into which such shares should be
         deposited,  (ii)  adequate  provision has been made with respect to the
         payment of any  withholding  taxes due upon such exercise and (iii) the
         broker-dealer and the Participant have otherwise  complied with Section
         220.3(e)(4) of Regulation T, 12 CFR Part 220.

            (5)  Certificates  for  shares of Common  Stock  purchased  upon the
         exercise  of an Option  shall be issued in the name of the  Participant
         and delivered to the  Participant as soon as practicable  following the
         effective  date on which the Option is  exercised;  provided,  however,
         that such  delivery  shall be effected  for all  purposes  when a stock
         transfer agent of the Company shall have deposited such certificates in
         the United States mail, addressed to the Participant.

            (6) During the lifetime of a Participant  each Option granted to him
         shall be  exercisable  only by him. No Option  shall be  assignable  or
         transferable  otherwise  than  by will or by the  laws of  descent  and
         distribution or pursuant to a Qualified Domestic Relations Order.

         (d)Limitations on Grant of Incentive Stock Options

            (1) The  aggregate  Fair Market Value of shares of Common Stock with
         respect to which  Incentive Stock Options are exercisable for the first
         time by a  Participant  during any calendar year under the Plan and any
         other stock option plan of the Company or any Subsidiary of the Company
         shall not exceed  $100,000.  Such Fair Market Value shall be determined
         as of the date on which each such Incentive Stock Option is granted. If
         the  aggregate  Fair Market Value of shares of Common Stock  underlying
         such Incentive  Stock Options  exceeds  $100,000,  then Incentive Stock
         Options granted hereunder to such Participant  shall, to the extent and
         in the order required by Regulations promulgated under the Code (or any
         other  authority  having the force of  Regulations),  automatically  be
         deemed to be  Non-Qualified  Stock  Options,  but all  other  terms and
         provisions of such Incentive Stock Options shall remain  unchanged.  In
         the absence of such Regulations (and authority), or if such Regulations
         (or  authority)  require or permit a  designation  of the options which
         shall cease to constitute  Incentive  Stock  Options,  Incentive  Stock
         Options  shall,  to the extent of such excess and in the order in which
         they were granted,  automatically be deemed to be  Non-Qualified  Stock
         Options,  but all other terms and  provisions of such  Incentive  Stock
         Options shall remain unchanged.

            (2) No Incentive Stock Option may be granted to an individual if, at
         the time of the proposed grant,  such individual owns stock  possessing
         more than ten percent of the total combined voting power of all classes
         of stock  of the  Company  or any of its  Subsidiaries  unless  (i) the
         exercise price of such Incentive  Stock Option is at least 110 % of the
         Fair Market Value of a share of Common Stock at the time such Incentive
         Stock  Option is granted and (ii) such  Incentive  Stock  Option is not
         exercisable  after  the  expiration  of five  years  from the date such
         Incentive Stock Option is granted.

         (e)Effect of  Termination  of  Employment  Unless  otherwise  expressly
      provided for by the Committee in its approval of an Option:

            (1) If the  employment  of a  Participant  with  the  Company  shall
         terminate  for any reason other than Cause,  Disability,  the voluntary
         retirement  of  the   Participant  in  accordance  with  the  Company's
         retirement policy as then in effect or the death of the Participant (i)
         Options  granted  to such  Participant,  to the  extent  that they were
         exercisable at the time of such termination,  shall remain  exercisable
         until the expiration of one month after such termination, on which date
         they shall expire, and (ii) Options granted to such Participant, to the
         extent that they were not exercisable at the time of such  termination,
         shall expire at the close of business on the date of such  termination;
         provided, however, that the Committee may extend

                                     -6-

<PAGE>



         such period in its sole  discretion  (except that the  agreement of the
         holder of any  Incentive  Stock Option shall be required as a condition
         to such extension if the effect of such extension would be to make such
         option  ineligible for treatment as an Incentive Stock Option under the
         Code; and provided  further,  no Option shall be exercisable  after the
         expiration of its term.

            (2) If the  employment  of a  Participant  with  the  Company  shall
         terminate on account of the Disability, the voluntary retirement of the
         Participant in accordance with the Company's  retirement policy as then
         in effect or the death of the  Participant  (i) Options granted to such
         Participant,  to the extent that they were  exercisable  at the time of
         such termination,  shall remain exercisable until the expiration of one
         year after such termination,  on which date they shall expire, and (ii)
         Options granted to such  Participant,  to the extent that they were not
         exercisable at the time of such termination,  shall expire at the close
         of business on the date of such  termination;  provided,  however,  the
         Committee  may extend such period in its sole  discretion  (except that
         the  agreement  of the holder of any  Incentive  Stock  Option shall be
         required  as a  condition  to  such  extension  if the  effect  of such
         extension  would be to make such option  ineligible for treatment as an
         Incentive  Stock Option under the Code; and provided  further,  that no
         Option shall be exercisable after the expiration of its term.

            (3) In the event of the  termination of a  Participant's  employment
         for Cause, all outstanding  Options granted to such  Participant  shall
         expire at the commencement of business on the date of such termination.

         (f)Acceleration of Exercise Date Upon Change in Control

         Upon the  occurrence of a Change in Control,  each Option granted under
      the Plan and  outstanding at such time shall become fully and  immediately
      exercisable and shall remain exercisable until its expiration, termination
      or cancellation pursuant to the terms of the Plan.

      7. Restricted Stock

         The  Committee  may grant shares of  Restricted  Stock  pursuant to the
Plan.  Each  grant of  shares  of  Restricted  Stock  shall be  evidenced  by an
agreement in such form as the Committee  shall from time to time  approve.  Each
grant of shares of  Restricted  Stock  shall  comply  with and be subject to the
following terms and conditions:

         (a)Issue Date and Vesting Date

         At the time of the grant of shares of Restricted  Stock,  the Committee
      shall establish an Issue Date or Issue Dates and a Vesting Date or Vesting
      Dates with respect to such shares.  The  Committee  may divide such shares
      into  classes and assign a different  Issue Date and/or  Vesting  Date for
      each class.  Except as provided in Sections 7(c) and 7(f) hereof, upon the
      occurrence of the Issue Date with respect to a share of Restricted  Stock,
      a share  of  Restricted  Stock  shall be  issued  in  accordance  with the
      provisions  of Section 7(d) hereof.  Provided  that all  conditions to the
      vesting of a share of Restricted  Stock  imposed  pursuant to Section 7(b)
      hereof are  satisfied,  and except as provided  in Sections  7(c) and 7(f)
      hereof, upon the occurrence of the Vesting Date with respect to a share of
      Restricted  Stock,  such share shall vest and the  restrictions of Section
      7(c) hereof shall cease to apply to such share.

         (b)Conditions to Vesting

         At the time of the grant of shares of Restricted  Stock,  the Committee
      may impose such  restrictions  or conditions,  not  inconsistent  with the
      provisions  hereof,  to the vesting of such  shares as it in its  absolute
      discretion  deems  appropriate.  By  way  of  example  and  not  by way of
      limitation,  the Committee  may require,  as a condition to the vesting of
      any class or classes of shares of Restricted  Stock,  that the Participant
      or the

                                     -7-

<PAGE>



      Company  achieve  certain  performance  criteria,   such  criteria  to  be
      specified by the Committee at the time of the grant of such shares.

         (c)Restrictions on Transfer Prior to Vesting

         Prior to the vesting of a share of Restricted  Stock,  no transfer of a
      Participant's  rights with  respect to such share,  whether  voluntary  or
      involuntary,  by operation of law or otherwise,  shall vest the transferee
      with  any  interest  or  right  in or  with  respect  to such  share,  but
      immediately upon any attempt to transfer such rights,  such share, and all
      of the rights related  thereto,  shall be forfeited by the Participant and
      the transfer shall be of no force or effect.

         (d)Issuance of Certificates

            (1) Except as provided in Sections  7(c) or 7(f) hereof,  reasonably
         promptly  after the Issue  Date with  respect  to shares of  Restricted
         Stock,  the  Company  shall  cause to be  issued  a stock  certificate,
         registered  in the name of the  Participant  to whom such  shares  were
         granted,  evidencing such shares;  provided, that the Company shall not
         cause to be issued such a stock  certificates  unless it has received a
         stock power duly  endorsed in blank with respect to such  shares.  Each
         such stock certificate shall bear the following legend:

            The  transferability  of this  certificate  and the  shares of stock
            represented  hereby  are  subject  to the  restrictions,  terms  and
            conditions  (including forfeiture and restrictions against transfer)
            contained in the Aronex Pharmaceuticals, Inc. 1989 Stock Option Plan
            and an Agreement  entered into between the registered  owner of such
            shares and Aronex  Pharmaceuticals,  Inc. A copy of the Plan and the
            Agreement  is on file  in the  office  of the  Secretary  of  Aronex
            Pharmaceuticals,  Inc., 3400 Research  Forest Drive,  The Woodlands,
            Texas 77381-4223

         Such legend shall not be removed from the  certificate  evidencing such
      shares until such shares vest pursuant to the terms hereof.

            (2) Each  certificate  issued pursuant to Paragraph  7(d)(1) hereof,
         together  with the stock  powers  relating to the shares of  Restricted
         Stock evidenced by such certificate,  shall be held by the Company. The
         Company  shall  issue  to the  Participant  a  receipt  evidencing  the
         certificates  held  by it  which  are  registered  in the  name  of the
         Participant.

         (e)Consequences Upon Vesting

         Upon the vesting of a share of Restricted  Stock  pursuant to the terms
      hereof,  the  restrictions  of Section 7(c) hereof shall cease to apply to
      such share.  Reasonably  promptly after a share of Restricted  Stock vests
      pursuant to the terms  hereof,  the  Company  shall cause to be issued and
      delivered  to  the  Participant  to  whom  such  shares  were  granted,  a
      certificate  evidencing  such  share,  free of the  legend  set  forth  in
      Paragraph  7(d)(1)  hereof,  together  with  any  other  property  of  the
      Participant  held by Company  pursuant to Section 7(d)  hereof;  provided,
      however,  that such  delivery  shall be effected for all purposes when the
      Company shall have  deposited such  certificate  and other property in the
      United States mail, addressed to the Participant.

         (f)Effect of Termination of Employment

            (1) If the  employment  of a  Participant  with  the  Company  shall
         terminate  for any  reason  other than  Cause  prior to the  vesting of
         shares of Restricted  Stock granted to such  Participant,  a portion of
         such  shares,  to the extent not  forfeited  or canceled on or prior to
         such termination  pursuant to any provision  hereof,  shall vest on the
         date of such  termination.  The portion  referred  to in the  preceding
         sentence shall

                                     -8-

<PAGE>



         be  determined by the Committee at the time of the grant of such shares
         of  Restricted  Stock  and  may  be  based  on the  achievement  of any
         conditions  imposed  by the  Committee  with  respect  to  such  shares
         pursuant to Section 10(b). Such portion may equal zero.

            (2) In the event of the  termination of a  Participant's  employment
         for Cause,  all shares of Restricted  Stock granted to such Participant
         which  have  not  vested  as of the  date  of  such  termination  shall
         immediately be forfeited.

         (g)Effect of Change in Control

         Upon the  occurrence  of a Change in Control,  all shares of Restricted
      Stock which have not theretofore  vested  (including those with respect to
      which the Issue Date has not yet occurred) shall immediately vest.

      8. Stock Bonuses

      The Committee may, in its absolute discretion, grant Stock Bonuses in such
amounts as it shall  determine from time to time. A Stock Bonus shall be paid at
such time and subject to such conditions as the Committee shall determine at the
time of the grant of such Stock Bonus.  Certificates  for shares of Common Stock
granted as a Stock Bonus shall be issued in the name of the  Participant to whom
such grant was made and  delivered to such  Participant  as soon as  practicable
after the date on which such Stock Bonus is required to be paid.

      9. Adjustment Upon Changes in Common Stock

         (a)Outstanding Restricted Stock

         Unless the Committee in its absolute discretion  otherwise  determines,
      if a  Participant  receives any  securities or other  property  (including
      dividends paid in cash) with respect to a share of Restricted  Stock,  the
      Issue Date with respect to which occurs prior to such event, but which has
      not  vested as of the date of such  event,  as a result  of any  dividend,
      stock split recapitalization, merger, consolidation, combination, exchange
      of shares or otherwise,  such  securities or other  property will not vest
      until  such  share of  Restricted  Stock  vests,  and shall be held by the
      Company pursuant to Paragraph 7(d)(2) hereof.

         The  Committee  may, in its  absolute  discretion,  adjust any grant of
      shares of Restricted  Stock,  the Issue Date with respect to which has not
      occurred as of the date of the occurrence of any of the following  events,
      to  reflect  any   dividend,   stock  split,   recapitalization,   merger,
      consolidation, combination, exchange of shares or similar corporate change
      as the  Committee  may deem  appropriate  to prevent  the  enlargement  or
      dilution of rights of Participants under the grant.

     (b)Outstanding  Options,  Increase  or Decrease  in Issued  Shares  Without
Consideration

         Subject to any required action by the  stockholders of the Company,  in
      the event of any  increase or  decrease in the number of issued  shares of
      Common Stock  resulting from a subdivision or  consolidation  of shares of
      Common Stock or the payment of a stock dividend (but only on the shares of
      Common  Stock),  or any other  increase  or decrease in the number of such
      shares  effected  without  receipt of  consideration  by the Company,  the
      Committee  shall  proportionally  adjust  the  number  of  shares  and the
      exercise  price per  share of Common  Stock  subject  to each  outstanding
      Option.  Conversion of any of the Company's  convertible  securities shall
      not be deemed to have been "effected  without receipt of  consideration by
      the Company."

         (c)Outstanding Options, Certain Mergers

         Subject to any required action by the  stockholders of the Company,  if
      the  Company  shall  be  the  surviving   corporation  in  any  merger  or
      consolidation  (except a merger or  consolidation as a result of which the
      holders

                                     -9-

<PAGE>



      of shares of Common Stock receive securities of another corporation), each
      Option  outstanding  on the date of such  merger  or  consolidation  shall
      entitle the  Participant to acquire upon exercise the  securities  which a
      holder of the  number of shares of Common  Stock  subject  to such  Option
      would have received in such merger or consolidation.

         (d)Outstanding Options, Certain Other Transactions

         In the event of a dissolution or liquidation of the Company,  a sale of
      all  or   substantially   all  of  the  Company's   assets,  a  merger  or
      consolidation  involving  the  Company  in which  the  Company  is not the
      surviving  corporation or a merger or consolidation  involving the Company
      in which the  Company  is the  surviving  corporation  but the  holders of
      shares of Common Stock receive  securities of another  corporation  and/or
      other  property,  including  cash,  the Committee  shall,  in its absolute
      discretion, have the power to:

            (i) cancel,  effective  immediately  prior to the occurrence of such
         event, each Option outstanding immediately prior to such event (whether
         or  not  then   exercisable),   and,  in  full  consideration  of  such
         cancellation, pay to the Participant to whom such Option was granted an
         amount in cash,  for each share of Common Stock  subject to such Option
         equal to the excess of (A) the value, as determined by the Committee in
         its absolute  discretion,  of the property (including cash) received by
         the  holder of a share of Common  Stock as a result of such  event over
         (B) the exercise price of such Option; or

            (ii) provide for the exchange of each Option outstanding immediately
         prior to such event (whether or not then  exercisable) for an option on
         some or all of the  property  for which such Option is  exchanged  and,
         incident  thereto,  make an equitable  adjustment  as determined by the
         Committee  in its  absolute  discretion  in the  exercise  price of the
         option,  or the number of shares or amount of  property  subject to the
         option  or,  if  appropriate,   provide  for  a  cash  payment  to  the
         Participant  to whom such Option was  granted in partial  consideration
         for the exchange of the Option.

         (e)Outstanding Options, Other Changes

         In the event of any  change in the  capitalization  of the  Company  or
      corporate  change  other than those  specifically  referred to in Sections
      9(b), (c) or (d) hereof,  the Committee  may, in its absolute  discretion,
      make such adjustments in the number and class of shares subject to Options
      outstanding  on the date on which such change  occurs and in the per share
      exercise  price  of  each  such  Option  as  the  Committee  may  consider
      appropriate to prevent dilution or enlargement of rights.

         (f)No Other Rights

         Except as expressly provided in the Plan, no Participant shall have any
      rights by reason of any subdivision or consolidation of shares of stock of
      any class,  the payment of any  dividend,  any increase or decrease in the
      number of shares  of stock of any class or any  dissolution,  liquidation,
      merger or consolidation of the Company or any other corporation. Except as
      expressly  provided  in the Plan,  no issuance by the Company of shares of
      stock of any class, or securities  convertible into shares of stock of any
      class,  shall affect,  and no  adjustment by reason  thereof shall be made
      with  respect  to,  the  number of shares of Common  Stock  subject  to an
      Incentive Award or the exercise price of any Option.

      10.   Rights as a Stockholder

      No person  shall  have any  rights as a  stockholder  with  respect to any
shares of Common Stock  covered by or relating to any  Incentive  Award  granted
pursuant to this Plan until the date of the issuance of a stock certificate with
respect to such  shares.  Except as  otherwise  expressly  provided in Section 9
hereof,  no  adjustment  to any  Incentive  Award shall be made for dividends or
other  rights  for which the  record  date  occurs  prior to the date such stock
certificate is issued.

                                     -10-

<PAGE>



      11.   No Special Employment Rights; No Right to Incentive Award

      Nothing contained in the Plan or any Incentive Award shall confer upon any
Participant any right with respect to the  continuation of his employment by the
Company or interfere  in any way with the right of the  Company,  subject to the
terms of any  separate  employment  agreement  to the  contrary,  at any time to
terminate  such  employment or to increase or decrease the  compensation  of the
Participant  from the rate in existence at the time of the grant of an Incentive
Award.

      No person  shall  have any claim or right to receive  an  Incentive  Award
hereunder.  The  Committee's  granting of an Incentive Award to a Participant at
any time shall neither require the Committee to grant an Incentive Award to such
Participant  or any other  Participant  or other person at any time nor preclude
the Committee  from making  subsequent  grants to such  Participant or any other
Participant or other person.

      12.   Securities Matters

         (a)The Company shall be under no obligation to effect the  registration
      pursuant to the  Securities Act of any shares of Common Stock to be issued
      hereunder  or  to  effect  similar   compliance   under  any  state  laws.
      Notwithstanding  anything herein to the contrary, the Company shall not be
      obligated to cause to be issued or delivered any  certificates  evidencing
      shares of Common  Stock  pursuant to the Plan unless and until the Company
      is  advised  by its  counsel  that  the  issuance  and  delivery  of  such
      certificates  is in compliance  with all applicable  laws,  regulations of
      governmental  authority and the requirements of any securities exchange on
      which shares of Common Stock are traded.  The Committee may require,  as a
      condition of the issuance and delivery of certificates  evidencing  shares
      of Common Stock  pursuant to the terms hereof,  that the recipient of such
      shares make such covenants, agreements and representations,  and that such
      certificates bear such legends, as the Committee,  in its sole discretion,
      deems necessary or desirable.

         (b)The exercise of any Option granted hereunder shall only be effective
      at such time as counsel to the  Company  shall  have  determined  that the
      issuance and delivery of shares of Common Stock  pursuant to such exercise
      is in compliance  with all applicable  laws,  regulations of  governmental
      authorities  and the  requirements  of any  securities  exchange  on which
      shares  of  Common  Stock  are  traded.  The  Company  may,  in  its  sole
      discretion,  defer the  effectiveness of any exercise of an Option granted
      hereunder  in order to allow  the  issuance  of  shares  of  Common  Stock
      pursuant  thereto to be made pursuant to registration or an exemption from
      registration  or other methods for compliance  available  under federal or
      state securities laws. The Company shall inform the Participant in writing
      of its  decision to defer the  effectiveness  of the exercise of an Option
      granted  hereunder.  During  the  period  that  the  effectiveness  of the
      exercise of an Option has been deferred,  the Participant  may, by written
      notice,  withdraw  such  exercise and obtain the refund of any amount paid
      with respect thereto.

      13.   Withholding Taxes

      Whenever  shares of Common  Stock are to be issued upon the exercise of an
Option, the occurrence of the Issue Date or Vesting Date with respect to a share
of Restricted  Stock or the payment of a Stock Bonus, the Company shall have the
right to  require  the  Participant  to remit to the  Company  in cash an amount
sufficient to satisfy federal, state and local withholding tax requirements,  if
any, attributable to such exercise,  occurrence or payment prior to the delivery
of any certificate or certificates for such shares.

      14.   Amendment of the Plan

      The Board of Directors may at any time suspend or discontinue  the Plan or
revise or amend it in any respect whatsoever,  provided,  however,  that without
approval of the holders of a majority of the outstanding  shares of Common Stock
present in person or by proxy at an annual or special  meeting of  stockholders,
no revision or amendment shall (i) increase the number of shares of Common Stock
that may be issued under the Plan, except as provided in Section

                                     -11-

<PAGE>



9 hereof,  (ii) materially increase the benefits accruing to individuals holding
Incentive  Awards granted  pursuant to the Plan or (iii)  materially  modify the
requirements as to eligibility for participation in the Plan.

      15.   No Obligation to Exercise

      The grant to a Participant  of an Option shall impose no  obligation  upon
such Participant to exercise such Option.

      16.   Transfers Upon Death

      Upon the death of a Participant,  outstanding  Incentive Awards granted to
such Participant may be exercised only by the executors or administrators of the
Participant's  estate or by any person or persons who shall have  acquired  such
right  to  exercise  by will or by the  laws of  descent  and  distribution.  No
transfer by will or the laws of descent and distribution of any Incentive Award,
or the right to exercise  any  Incentive  Award,  shall be effective to bind the
Company  unless the Committee  shall have been furnished with (a) written notice
thereof and with a copy of the will and/or such  evidence as the  Committee  may
deem necessary to establish the validity of the transfer and (b) an agreement by
the  transferee  to comply with all the terms and  conditions  of the  Incentive
Award that are or would have been  applicable to the Participant and to be bound
by the  acknowledgments  made by the Participant in connection with the grant of
the Incentive Award.

      17.   Expenses and Receipts

      The  expenses  of the Plan  shall  be paid by the  Company.  Any  proceeds
received by the Company in connection  with any Incentive Award will be used for
general corporate purposes.

      18.   Failure to Comply

      In addition to the remedies of the Company elsewhere  provided for herein,
failure by a Participant  to comply with any of the terms and  conditions of the
Plan or the  agreement  executed by such  Participant  evidencing  an  Incentive
Award, unless such failure is remedied by such Participant within ten days after
having been notified of such failure by the Committee,  shall be grounds for the
cancellation  and forfeiture of such Incentive Award, in whole or in part as the
Committee, in its absolute discretion, may determine.

      19.   Effective Date and Term of Plan

      The amendment and restatement of this Plan shall become effective, subject
to stockholder approval, on April 1, 1997. The amendment and restatement of this
Plan, and all Incentive Awards granted pursuant to the amendment and restatement
of this Plan  prior to  stockholder  approval,  shall be void and of no  further
force and effect unless the amendment  and  restatement  of this Plan shall have
been approved by the requisite  vote of the  stockholders  entitled to vote at a
meeting of the stockholders of the Company called for such purpose prior to July
30, 1997.  In the event such  stockholder  approval is not  obtained,  this Plan
shall continue in existence with the terms and conditions in effect prior to the
effective  date  of the  amendment  and  restatement  provided  for  hereby.  No
Incentive Award shall be granted  pursuant to this Plan on or after December 31,
1999.

                                     -12-




                                                                  Exhibit 10.2
                         ARONEX PHARMACEUTICALS, INC.
                    AMENDED AND RESTATED 1993 NON-EMPLOYEE
                          DIRECTOR STOCK OPTION PLAN


      Aronex  Pharmaceuticals,  Inc.,  a Delaware  Corporation  (the  "Company")
hereby amends and restates its Amended and Restated 1993  Non-Employee  Director
Stock Option Plan (this  "Plan"),  effective  as of March 12,  1997,  subject to
stockholder approval.

      1. Purpose.

      The purpose of this Plan is to promote and  advance the  interests  of the
Company by aiding the Company in attracting and retaining qualified directors of
the Company who, at the time of their service,  are not employees of the Company
or any of its subsidiaries ("Non-Employee Directors"),  and to further align the
interests of such  Non-Employee  Directors  with those of  stockholders  through
stock options. An additional purpose of this Plan is to recognize and reward the
contributions of Non-Employee  Directors who are actively involved in aspects of
the Company's business beyond their role as directors.

      2. Administration.

      This Plan shall be administered by the Compensation Committee of the Board
of Directors of the Company (the  "Committee"),  which shall consist of not less
than two members of the Board of Directors, each of whom will be a "non-employee
director"  within  the  meaning  of Rule 16b-3 of the  Securities  and  Exchange
Commission  (or any successor rule to the same effect) as in effect from time to
time and an  "outside  director"  within the  meaning  of Section  162(m) of the
Internal  Revenue  Code of 1986,  as amended.  For the  purposes of this Plan, a
majority  of the  members of the  Committee  shall  constitute  a quorum for the
transaction of business,  and the vote of a majority of those members present at
any meeting shall decide any question brought before that meeting.  No member of
the Committee shall be liable for any act or omission of any other member of the
Committee  or for  any  act or  omission  on his own  part,  including  (without
limitation)  the  exercise  of any power or  discretion  given to him under this
Plan,   except  those  resulting  from  his  own  gross  negligence  or  willful
misconduct.  All questions of interpretation and application of this Plan, or as
to  options  granted  hereunder  (the  "Options"),   shall  be  subject  to  the
determination,  which  shall be final and  binding,  of a majority  of the whole
Committee.

      3. Option Shares.

      The stock  subject to the Options and other  provisions of this Plan shall
be shares of the Company's  Common Stock, par value $.001 per share (the "Common
Stock").  The total amount of the Common Stock with respect to which Options may
be granted shall not exceed 600,000 shares in the aggregate;  provided, that the
class and aggregate number of shares which may be subject to the Options granted
hereunder  shall be subject to adjustment in accordance  with the  provisions of
Section 11 of this Plan.  Such shares may be treasury  shares or authorized  but
unissued shares.

      If any  outstanding  Option for any reason  shall  expire or  terminate by
reason of the death of the optionee or the fact that the optionee ceases to be a
director,  the surrender of any such Option,  or any other cause,  the shares of
Common Stock  allocable to the  unexercised  portion of such Option may again be
subject to an Option under this Plan.

                                     -1-

<PAGE>




4.    Grant of Options.

      (a)   Formula Grants.

            (i) Directors on the Effective Date of the Amendment and Restatement
         of this Plan.  Subject to the  provisions  of Section 15 hereof,  there
         shall be granted to each person who is a  Non-Employee  Director,  upon
         the effective  date of the amendment and  restatement  of this Plan, an
         Option to  purchase  16,250  shares of the Common  Stock at a per share
         Option Price equal to the fair market  value (as defined in  Subsection
         4(a)(iv) below) of a share of Common Stock on such date.

            (ii) Directors Elected after the Effective Date of the Amendment and
         Restatement  of this  Plan.  Subject  to the  provisions  of Section 15
         hereof,  for so long as this Plan is in effect and shares are available
         for the grant of Options hereunder, each person who is not otherwise an
         employee  of the  Company,  and who is first  elected  to the  Board of
         Directors  after the effective date of the amendment and restatement of
         this Plan, shall be granted, on the date of his election,  an Option to
         purchase  25,000  shares of Common  Stock (such  number of shares being
         subject to the  adjustments  provided  in Section 11 of this Plan) at a
         per share  Option  Price equal to the fair  market  value of a share of
         Common Stock on such date.

            (iii) Annual  Grants.  On December 31 of each year that this Plan is
         in effect  (commencing  with  December  31,  1997),  each  Non-Employee
         Director who is in office on that day (provided that such  Non-Employee
         Director has served as a director for at least six months prior to such
         date) shall automatically receive an Option to purchase 7,500 shares of
         Common Stock (such number of shares  being  subject to the  adjustments
         provided in Section 11 of this Plan) at a per share  Option Price equal
         to the fair market value of a share of Common Stock on such date.

            (iv) Fair Market  Value.  For  purposes of this Section 4, the "fair
         market  value" of a share of  Common  Stock as of any  particular  date
         shall mean (i) if the Common  Stock is listed or admitted to trading on
         any  securities  exchange or on the National  Association of Securities
         Dealers (the "NASD")  Automated  Quotation System  ("Nasdaq")  National
         Market,  the  closing  price  on such day on the  principal  securities
         exchange or on the Nasdaq  National Market on which the Common Stock is
         traded  or  quoted,  or if  such  day is not a  trading  day  for  such
         securities exchange or the Nasdaq National Market, the closing price on
         the first  preceding  day that was a trading  day,  (ii) if the  Common
         Stock is not then  listed or  admitted  to  trading  on any  securities
         exchange  or on the Nasdaq  National  Market,  the closing bid price on
         such day as  reported  by the NASD,  or if no such price is reported by
         the NASD for such day, the closing bid price as reported by the NASD on
         the first preceding day for which such price is available, and (iii) if
         the  Common  Stock is not then  listed or  admitted  to  trading on any
         securities  exchange  or on the  Nasdaq  National  Market  and no  such
         closing  bid  price is  reported  by the  NASD,  as  determined  by the
         Committee in good faith.

            (v) No Discretion with Respect to Formula  Grants.  The selection of
         Non-Employee  Directors to whom  Options are to be granted  pursuant to
         this Section 4(a), the number of shares subject to any such Option, the
         exercise price of any such Option and the term of any such Option shall
         be as provided  herein and the Committee shall have no discretion as to
         such matters.

         (b)Discretionary  Grants. The Committee may from time to time authorize
      grants to any  Non-Employee  Director  (provided that no such grant may be
      made to a Non-Employee Director who is a member of the Committee, and that
      no such grant may be made that would  prevent the members of the Committee
      from constituting "non-employee director" within the meaning of Rule 16b-3
      or "outside directors" within the meaning of Section 162(m)) of Options to
      purchase  shares of Common Stock upon such terms and  conditions as it may
      determine in accordance with the following provisions:


                                     -2-

<PAGE>



            (i) Each grant will  specify the number of shares of Common Stock to
         which the Option granted pertains.

            (ii) Each grant will specify the Option  Price of the Option,  which
         may be less than,  equal to or greater  than the fair market value of a
         share of Common Stock on the date of grant.

            (iii)  Each  grant may  specify  the  required  period or periods of
         continuous  service by the grantee  with the  Company  and/or the other
         conditions  of  vesting  (if any)  before  the  Option or  installments
         thereof will become exercisable.

         (c)Outstanding  Options.  The  amendment and  restatement  of this Plan
      shall not affect the terms and conditions of any Options  (including terms
      relating to the vesting and term thereof)  outstanding  under this Plan on
      the effective date of such amendment and restatement.

      5. Vesting and Term of Options.

      Each Option granted under Section 4(a) of this Plan shall vest in full and
be  exercisable  to purchase  all of the shares of Common  Stock  subject to the
Option on the date on which the  Option was  granted,  and each  Option  granted
under  Section 4(b) of this Plan shall vest and be  exercisable  to purchase the
number of shares subject to the Option at such times and upon such conditions as
may be established  by the Committee on the date of grant,  subject in each case
to earlier  termination  as  provided  in Section 8 of this  Plan.  Each  Option
granted  under this Plan shall  expire on the tenth  anniversary  of the date on
which the Option was granted.

      6. Exercise of Options.

      An optionee may exercise his Option by delivering to the Company a written
notice stating (a) that such optionee wishes to exercise such Option on the date
such  notice is so  delivered,  (b) the  number of shares of Common  Stock  with
respect to which such Option is to be exercised and (c) the address to which the
certificate representing such shares of stock should be mailed. To be effective,
such written  notice shall be accompanied by payment of the Option Price of each
of such  shares  of  Common  Stock.  Each  such  payment  shall be made by cash,
cashier's check or bank draft drawn on a national banking  association or postal
or express  money  order,  payable to the order of the Company in United  States
dollars.

      Any Option  granted  under the Plan may be  exercised  by a  broker-dealer
acting on behalf of an optionee if (i) the  broker-dealer  has received from the
optionee or the Company a duly  endorsed  agreement  evidencing  such Option and
instructions signed by the optionee requesting the Company to deliver the shares
of Common  Stock  subject to such Option to the  broker-dealer  on behalf of the
Participant  and  specifying  the  account  into  which  such  shares  should be
deposited,  (ii) adequate provision has been made with respect to the payment of
any withholding  taxes due on such exercise and (iii) the  broker-dealer and the
optionee have  otherwise  complied with Section  220.3(e)(4) of Regulation T, 12
CFR Part 220.

      As promptly as practicable  after the receipt by the Company,  in the form
required by the  foregoing  provisions  of this  Section 6, of (a) such  written
notice from the optionee  and (b) payment,  of the Option Price of the shares of
stock with respect to which such Option is to be  exercised,  the Company  shall
deliver to such  optionee  a  certificate  representing  the number of shares of
stock with respect to which such Option has been so exercised  registered in the
name of such  optionee,  provided that such delivery shall be considered to have
been made when such certificate shall have been mailed, postage prepaid, to such
optionee at the address  specified for such purpose in such written  notice from
the optionee to the Company.



                                     -3-

<PAGE>



      7. Transferability of Options.

      Options shall not be transferable  by the optionee  otherwise than by will
or under the laws of descent and distribution.

      8. Termination.

      Except as may be  otherwise  expressly  provided in this Plan or otherwise
determined by the Committee,  each Option,  to the extent it shall not have been
exercised previously, shall terminate on the earliest of the following:

         (a)On  the last day of the 24 month  period  commencing  on the date on
      which  the  optionee  ceases  to be a  member  of the  Company's  Board of
      Directors,  for any reason  other than the death of the  optionee,  during
      which period the  optionee  shall be entitled to exercise all Options held
      by the optionee on the date on which the optionee ceased to be a member of
      the Company's  Board of Directors  which could have been exercised on such
      date;

         (b)On the last day of the  six-month  period  commencing on the date of
      the optionee's  death while serving as a member of the Company's  Board of
      Directors,  during  which  period the  executor  or  administrator  of the
      optionee's  estate or the person or persons to whom the optionee's  Option
      shall  have  been   transferred   by  will  or  the  laws  of  descent  or
      distribution,  shall be entitled to exercise all Options in respect of the
      number of shares that the  optionee  would have been  entitled to purchase
      had the optionee exercised such Options on the date of his death; or

         (c)Ten years after the date of grant of such Option.

      9. Requirements of Law.

      The Company  shall not be  required to sell or issue any shares  under any
Option if the  issuance  of such shares  shall  constitute  a  violation  by the
optionee  or the  Company  of any  provisions  of any law or  regulation  of any
governmental authority.  Each Option granted under this Plan shall be subject to
the  requirement  that,  if at any time the Board of Directors of the Company or
the  Committee   shall   determine  that  (i)  the  listing,   registration   or
qualification  of the shares  subject  thereto upon any  securities  exchange or
under any state or federal law of the United  States or of any other  country or
governmental   subdivision  thereof,   (ii)  the  consent  or  approval  of  any
governmental  regulatory  body,  or (iii)  the  making  of  investment  or other
representations,  are  necessary or desirable  in  connection  with the issue or
purchase of shares subject thereto,  no such Option may be exercised in whole or
in part unless such listing, registration,  qualification,  consent, approval or
representation  shall have been effected or obtained free of any  conditions not
acceptable to the Board of Directors.  Any  determination  in this connection by
the Committee shall be final, binding and conclusive.  If the shares issuable on
exercise of an Option are not  registered  under the Securities Act of 1933, the
Company may imprint on the certificate  for such shares the following  legend or
any legend  which  counsel for the Company  considers  necessary or advisable to
comply with the Securities Act of 1933:

      THE  SHARES  OF  STOCK  REPRESENTED  BY THIS  CERTIFICATE  HAVE  NOT  BEEN
      REGISTERED  UNDER THE SECURITIES ACT OF 1933 OR UNDER THE SECURITIES  LAWS
      OF ANY  STATE  AND  MAY  NOT BE  SOLD  OR  TRANSFERRED  EXCEPT  UPON  SUCH
      REGISTRATION  OR UPON RECEIPT BY THE  CORPORATION OF AN OPINION OF COUNSEL
      SATISFACTORY TO THE CORPORATION, IN FORM AND SUBSTANCE SATISFACTORY TO THE
      CORPORATION, THAT REGISTRATION IS NOT REQUIRED FOR SUCH SALE OR TRANSFER.

The Company may, but shall in no event be obligated to,  register any securities
covered  hereby  pursuant to the  Securities Act of 1933 (as now in effect or as
hereinafter  amended)  and,  if any shares are so  registered,  the  Company may
remove any legend on certificates  representing  such shares.  The Company shall
not be obligated to take any other affirmative

                                     -4-

<PAGE>



action to cause the  exercise of an Option or the  issuance  of shares  pursuant
thereto to comply with any law or regulation or any governmental authority.

      10.   No Rights as Stockholder.

      No optionee  shall have  rights as a  stockholder  with  respect to shares
covered by his Option until the date of issuance of a stock certificate for such
shares;  and, except as otherwise  provided in Section 11 hereof,  no adjustment
for dividends, or otherwise,  shall be made if the record date therefor is prior
to the date of issuance of such certificate.

      11. Changes in the Company's Capital Structure.

      The existence of outstanding Options shall not affect in any way the right
or power of the  Company or its  stockholders  to make or  authorize  any of all
adjustments,   recapitalizations,   reorganizations  or  other  changes  in  the
Company's  capital  structure or its business or any merger or  consolidation of
the Company,  or any issue of bonds,  debentures,  preferred or prior preference
stock  ahead of or  affecting  the Common  Stock or the rights  thereof,  or the
dissolution or liquidation of the Company, or any sale or transfer of all or any
part of its  assets or  business,  or any  other  corporate  act or  proceeding,
whether of a similar character or otherwise.

      If the Company shall effect a subdivision  or  consolidation  of shares or
other capital readjustment, the payment of a stock dividend or other increase or
reduction  of the  number of shares of the  Common  Stock  outstanding,  without
receiving  consideration  therefor in money, services or property,  then (a) the
number,  class and per share  price of shares of stock  subject  to  outstanding
Options hereunder shall be appropriately adjusted in such a manner as to entitle
an optionee to receive upon exercise of an Option,  for the same  aggregate cash
consideration,  the same total number and class or classes of shares as he would
have received had he exercised his Option in full immediately prior to the event
requiring the  adjustment;  and (b) the number and class of shares then reserved
for  issuance  under  this Plan and the  number of shares to be  subject  to the
grants to be made  pursuant to Section  4(a)(ii)  and (iii) shall be adjusted by
substituting  for the total number and class of shares of stock then reserved or
subject  to grant the  number and class or classes or shares of stock that would
have been  received  by the owner of an equal  number of  outstanding  shares of
Common Stock as the result of the event requiring the  adjustment,  disregarding
any fractional shares.

      If the Company merges or consolidates with another corporation, whether or
not the Company is a surviving  corporation,  or if the Company is liquidated or
sells or otherwise disposes of substantially all of its assets while unexercised
Options remain  outstanding under this Plan, or if any "person" (as that term is
used in Section 13(d) and 14(d)(2) of the Securities Exchange Act of 1934) is or
becomes the  beneficial  owner,  directly or  indirectly,  of  securities of the
Company  representing  greater  than  50% of the  combined  voting  power of the
Company's then outstanding securities,  after the effective date of such merger,
consolidation,  liquidation, sale or other disposition, as the case may be, each
holder of an outstanding Option shall be entitled, upon exercise of such Option,
to receive,  in lieu of shares of Common Stock,  the number and class or classes
of shares of such stock or other  securities  or  property  to which such holder
would have been entitled if,  immediately  prior to such merger,  consolidation,
liquidation,  sale or other  disposition,  such  holder  had been the  holder of
record of a number of shares of Common Stock equal to the number of shares as to
which such Option may be exercised.

      Except as  otherwise  expressly  provided  in this Plan,  the issue by the
Company of shares of stock of any class, or securities  convertible  into shares
of stock of any class,  for cash or  property,  or for labor or services  either
upon  direct  sale or upon the  exercise  of rights  or  warrants  to  subscribe
therefor, or upon conversion of shares or obligations of the Company convertible
into such shares or other  securities,  shall not affect,  and no  adjustment by
reason  thereof  shall be made with respect to, the number or price of shares of
Common Stock then subject to outstanding Options.

      12. Amendment or Termination of Plan.

      The Board of Directors  may modify,  revise or terminate  this Plan at any
time and from time to time; provided, however, that without the further approval
of the holders of at least a majority of the outstanding shares of voting stock,

                                     -5-

<PAGE>


or if the provisions of the corporate  charter,  bylaws or applicable  state law
prescribes a greater degree of stockholder approval for this action, without the
degree of stockholder approval thus required, the Board of Directors may not (a)
materially  increase the benefits accruing to participants  under this Plan; (b)
materially  increase  the  number of shares of Common  Stock  that may be issued
under this Plan; or (c) materially modify the requirements as to eligibility for
participation in this Plan, unless, in each such case, the Board of Directors of
the Company  shall have  obtained an opinion of legal counsel to the effect that
stockholder  approval of the  amendment  is not  required (x) by law, (y) by the
rules and  regulations  of, or any agreement  with, the National  Association of
Securities  Dealers,  Inc. or (z) to make available to the optionee with respect
to any Option  granted  under  this Plan the  benefits  of Rule 16b-3  under the
Securities  Exchange Act of 1934 (the "1934  Act"),  or any similar or successor
rule. In addition,  this Plan may not be amended more than once every six months
with respect to the plan provisions referred to in Rule 16b-3(c)(2)(ii)(A) under
the 1934 Act other than to comport with changes in the Internal  Revenue Code of
1986,  as amended,  the Employee  Retirement  Income  Security  Act of 1974,  as
amended,  or the rules thereunder.  All Options granted under this Plan shall be
subject to the terms and provisions of this Plan and any amendment, modification
or revision of this Plan shall be deemed to amend,  modify or revise all Options
outstanding  under  this  Plan at the time of such  amendment,  modification  or
revision.  If this Plan is terminated  by action of the Board of Directors,  all
outstanding Options may be terminated.

      13.   Written Agreement.

      Each  Option  granted  hereunder  shall be  embodied  in a written  option
agreement,  which shall be subject to the terms and conditions prescribed above,
and  shall be signed  by the  optionee  and by the  appropriate  officer  of the
Company  for and in the  name  and on  behalf  of the  Company.  Such an  option
agreement shall contain such other provisions as the Committee in its discretion
shall deem advisable.

      14. Indemnification of Committee and Board of Directors.

      The Company  shall,  to the fullest  extent  permitted by law,  indemnify,
defend and hold  harmless any person who at any time is a party or is threatened
to be made a party to any  threatened,  pending  or  completed  action,  suit or
proceeding (whether civil, criminal, administrative or investigative) in any way
relating  to or  arising  out of this  Plan or any  Option  or  Options  granted
hereunder  by  reason  of the  fact  that  such  person  is or was at any time a
director of the Company or a member of the Committee against  judgments,  fines,
penalties,  settlements  and reasonable  expenses  (including  attorney's  fees)
actually  incurred  by such  person  in  connection  with such  action,  suit or
proceeding.  This right of  indemnification  shall  inure to the  benefit of the
heirs,  executors and  administrators  of each such person and is in addition to
all other rights to which such person may be entitled by virtue of the bylaws of
the Company or as a matter of law, contract or otherwise.

      15. Effective Date of Amended and Restated Plan.

      The amendment and restatement of this Plan shall become effective, subject
to stockholder  approval,  on March 12, 1997.  The amendment and  restatement of
this Plan, and all Options granted  pursuant to the amendment and restatement of
this Plan prior to stockholder  approval,  shall be void and of no further force
and effect  unless the amendment  and  restatement  of this Plan shall have been
approved by the requisite vote of the stockholders entitled to vote at a meeting
of the  stockholders  of the Company  called for such purpose  prior to July 30,
1997. In the event such  stockholder  approval is not obtained,  this Plan shall
continue  in  existence  with the terms and  conditions  in effect  prior to the
effective date of the amendment and restatement  provided for hereby.  No Option
shall be granted pursuant to this Plan on or after September 30, 2003.


                                     -6-



                                 LEASE AGREEMENT
                     VENTURE TECHNOLOGY CENTER VII BUILDING
                          8707 TECHNOLOGY FOREST PLACE
                     THE WOODLANDS, MONTGOMERY COUNTY, TEXAS

     THIS LEASE AGREEMENT ("Lease") is made and entered into on this the 4th day
of April,  1997,  between THE  WOODLANDS  CORPORATION,  a Delaware  corporation,
("Lessor"),   and  ARONEX   PHARMACEUTICALS,   INC.,  a  Delaware   corporation,
("Lessee").

         l.  Premises.  Upon the terms and  conditions  hereinafter  set  forth,
Lessor does hereby lease, demise and let to Lessee and Lessee does hereby lease,
and take from Lessor, the following described premises ("Premises"):

         All that  certain  tract or  parcel  of land  containing  approximately
         3.6147  acres  described  in  Exhibit  "A"  attached  hereto  ("Land"),
         together  with that  certain  structure  to be  constructed  thereon by
         Lessor  having  approximately  30,000  square feet of net rentable area
         ("Building") and a parking area;

known and referred to as Venture  Technology  Center VII Building  ("Building"),
located at 8707  Technology  Forest Place,  The  Woodlands,  Montgomery  County,
Texas.  The Premises is shown on the site  development  plan attached  hereto as
Exhibit "A-1" ("Site Plan").

         2. Parking.  Upon completion of the Building,  a parking area providing
for approximately 81 parking spaces and access drives will be provided by Lessor
on the Land at no charge for the  Initial  Term,  and any  renewal  thereof,  in
accordance with the terms of the Lease.
 "Initial  Term",  as used  herein,  shall  mean the first 120 month term of the
Lease  described  in 3 below Lessee  shall have the  exclusive  right to use the
parking  areas and  access  drives  during the Term for  ingress  and egress and
automobile  parking,  except  that Lessor and any future  owners  shall have the
right to construct  pathways in the forest  preserves  over the Land and utilize
the  parking  areas and access  drives  for  ingress  and egress and  automobile
parking in connection  with its rights and obligations  under the Lease.  During
the Term, Lessor shall keep the parking areas and access drives and the Building
exterior in a neat,  clean and orderly  condition,  lighted and  landscaped  and
shall repair any damage to same. The use of such parking areas and access drives
shall at all times be subject to such reasonable rules and regulations as Lessor
may promulgate.

         3. Term.  The term of this Lease  ("Term")  shall  commence on the date
("Commencement  Date") which is the earlier of (a) 10 days after Lessor  tenders
to Lessee  possession  of the  Premises  with all work to be performed by Lessor
pursuant  to the  tenant  improvement  letter  attached  hereto as  Exhibit  "B"
("Tenant Improvement Letter") substantially  completed or (b) the day upon which
Lessee takes occupancy of the Premises,  and shall expire on the last day of the
120th full calendar month following the  Commencement  Date,  subject to earlier
termination as hereinafter  provided.  Lessor shall not be liable or responsible
for any claims,  damages or liabilities  of any nature  whatsoever in connection
with or by reason of any delayed  occupancy.  Within 15 days following  Lessee's
receipt from Lessor of a memorandum of this Lease  specifying  the  Commencement
Date  and  date  of  expiration  of the  Term,  Lessee  agrees  to  execute  the
memorandum.


                                                         1

<PAGE>




         4. Use. Lessee shall use the entire Premises solely for general office,
research and development laboratory purposes , and for no other use.

         5.  Acceptance  of the Premises.  Upon taking  possession of all or any
portion of the  Premises,  Lessee shall be deemed to have accepted the Premises,
to have acknowledged that the same are in the condition called for hereunder and
to have  agreed  that the  obligations  of the Lessor  imposed  by  Exhibit  "B"
attached  hereto have been fully performed  except for punch list items.  Lessor
will use  reasonable  efforts to  complete  the punch list items  within 30 days
after the Commencement  Date (unless the failure to complete is due to events of
Lessee  Delay as  described  Exhibit  "B").  Lessee  hereby  waives any  implied
warranty of Lessor that the Premises are suitable for their intended  commercial
purpose and acknowledges and agrees that all of Lessee's  obligations  hereunder
(including  without  limitation,  the obligation to pay rent) are independent of
any such  implied  warranty and agrees to perform all such  obligations  and pay
rent  notwithstanding  any breach or  allegation of breach by Lessor of any such
implied  warranty  (which  implied  warranty as  aforesaid  is hereby  waived by
Lessee).


         6.       Security Deposit.  INTENTIONALLY DELETED.  


         7. Base  Rent.  The Base Rent,  which  Lessee  hereby  agrees to pay to
Lessor  monthly,  in advance,  at Lessor's  address  stated above,  shall be the
monthly  sum  calculated  as  described  in Article 7 of the Tenant  Improvement
Letter  attached  as  Exhibit  "B",  due and  payable  on the  first day of each
calendar month during the Term hereof,  without offset or deduction,  with a pro
rata portion being due and payable in advance for any partial month occurring at
the beginning of the Term.

                                                         2

<PAGE>




         8.  Additional  Rent.  Lessee agrees to pay all Operating  Expenses (as
defined  in Section 10 below) for the  Premises.  Within 90 days  following  the
completion  of each  Fiscal  Year,  Lessor  will  provide to Lessee a  statement
showing in  reasonable  detail the Operating  Expenses for the preceding  Fiscal
Year, the  Additional  Rent due, and Lessor's  reasonable  estimate of Operating
Expenses for the then current  Fiscal Year.  Lessee shall,  on or before 30 days
following receipt of said statement, pay to Lessor the amount of Additional Rent
due as provided  herein,  less the amount of Additional Rent paid in advance (if
any) during the  preceding  Fiscal  Year.  Any  overpayment  will be credited by
Lessor to the next rental  payment(s) due on or before 30 days after delivery of
the  statement  to  Lessee.  Lessee  agrees to pay  Additional  Rent each  month
thereafter,  in addition to Base Rent,  in an amount  necessary  to amortize the
estimated  Operating  Expenses  for the then  current  Fiscal Year over a period
equal to the lesser of (i) the number of months  remaining  in the Term on a pro
rata basis or (ii) the number of months  remaining  in the current  Fiscal Year.
Notwithstanding  that the Term has  expired  or been  terminated,  Lessee  shall
remain liable for and agrees to pay to Lessor within 30 days  following  receipt
of an invoice therefor,  Operating Expenses for the Fiscal Year during which the
Term expired or was terminated.  Lessee shall have the right, at its expense and
at a reasonable  time, to audit Lessor's  books relevant to the Additional  Rent
due  under  this  Section.  In the  event  Lessee  determines  that  Lessor  has
overstated  Lessee's Additional Rent in any Fiscal Year by greater than 3%, then
Lessor agrees to promptly  refund any overpayment to Lessee after written notice
from Lessee,  accompanied by evidence  substantiating  the  overpayment,  and to
reimburse  Lessee for  Lessee's  reasonable  costs of the  audit,  not to exceed
$1,000.00.  If Lessor and Lessee  are unable to agree upon the  accuracy  of any
such statement, either party may initiate a civil suit in any court of competent
jurisdiction  and the  amount of said  Additional  Rent  shall be paid to Lessor
pending the  rendering of a decision.  The term "Fiscal  Year",  as used herein,
shall mean Lessor's  fiscal year for accounting  purposes which currently is the
12-month  period  beginning  January 1 and ending December 31. Lessor shall have
the right to change the Fiscal  Year,  from time to time,  and,  in such  event,
Lessor shall notify Lessee in writing of such change.  Lessee also agrees to pay
to Lessor, as Additional Rent, a management fee ("Management  Fee") of 3% of the
annual  Base  Rent.  Lessee  agrees to pay the  Management  Fee each  month,  in
addition to other  Additional Rent and Base Rent,  during each Fiscal Year in an
amount  necessary to amortize the Management Fee and Additional Rent due for the
then current  Fiscal Year over a 12 month  period.  For the Fiscal Year in which
the Term begins or ends,  Lessee  shall only be  responsible  for the  amortized
Management Fee and  Additional  Rent due for the months of each such Fiscal Year
that the Lease is in force. This Section of the Lease is subject to the terms of
Section 6. of Rider 1 to the Lease.

         9.  Payment of Rentals.  Lessee  covenants  to promptly pay all rentals
when due and payable.  A late charge of 7% shall be added to any payment of Base
Rent or  Additional  Rent  which  is more  than 10 days  past  due in  order  to
compensate  Lessor for the extra  administrative  expenses  incurred.  If Lessor
shall pay any monies or incur any expenses in  correction  of  violations of the
covenants  herein set forth, the amounts so paid or incurred shall, on notice to
Lessee,  be  considered  additional  rent  payable  by  Lessee  with  the  first
installment  of Base Rent  thereafter  to  become  due and  payable,  and may be
collected or enforced as by law provided in respect of rentals.

         10.  Operating  Expenses.  The term  "Operating  Expenses" means all of
Lessor's  costs,  expenses and  disbursements  (but not  acquisition  of capital
investment items, except as hereinafter

                                                         3

<PAGE>



expressly  provided or specific costs billed to specific lessees) to operate and
maintain the Land, the Building,  and all  improvements on the Land from time to
time (to the extent and only to the extent same are Lessor's  obligation  to pay
or furnish under the other provisions of this Lease), including, but not limited
to,  Lessor's  costs of  providing  utilities,  including,  but not  limited  to
lighting;  porter  services and  supplies;  refuse  removal (if Lessor elects to
furnish  this  service);   courtesy  guard  services;   landscaping,   including
irrigation; and general maintenance and repairs,  including, but not limited to,
repairs to roof surface and  preventive  maintenance,  parking area  restriping,
exterior painting and other activities.  Operating Expenses shall also include a
reasonable amortization charge on account of any capital expenditure incurred to
effect  a  reduction  of  Operating   Expenses  and  a  reasonable   charge  for
amortization  of all  capital  items  Lessor  installs  (a) to reduce  Operating
Expenses,  so long as the  amortization  charge never exceeds the savings in any
future year, or (b) which Lessor is required to install on or for the benefit of
the Building by any governmental law, code or regulation passed or enacted on or
after the  Commencement  Date,  or (c) which is a  replacement  (as  opposed  to
additions or new  improvements) of items located in the common areas adjacent to
the Building,  the parking area and other facilities used in connection with the
Building, or involving the exterior of the Building,  including, but not limited
to, the roof and structural  elements.  Additionally,  Operating  Expenses shall
include  all ad valorem  taxes or  assessments,  and Annual  Assessments  of The
Woodlands Commercial Owners Association which accrue against the Building or the
Land during the Term,  together  with all  insurance  premiums  which  Lessor is
required to pay or deems  necessary  to pay with  respect to the Building or the
Land, including, but not limited to, casualty insurance and liability insurance.

         11.  Utilities.  Lessor  shall  make  available  to the  Building  gas,
electricity,  water and sewer facilities.  Lessee agrees to assume all costs and
expenses  for water and  sewer,  except as herein  provided,  gas,  electricity,
telephone,  and any other service needed for its use at the Premises,  including
any license or deposit required to establish or maintain such services,  and the
costs of  hook-up.  Lessor  agrees to pay all costs and  expenses  for water and
sewer  service.  The cost of these  services  shall be included  with  Operating
Expenses  as defined in Section 10 hereof.  Lessee  shall  promptly  pay for all
utility services furnished to the Premises during the term of this Lease. Lessor
shall under no  circumstances be liable to Lessee in damage or otherwise for any
interruption  in service of water,  electricity,  heating,  air  conditioning or
other  utilities or services  caused by govern mental  regulation,  emergencies,
Acts of God, by the making of any necessary  repairs or improve ments, or by any
cause beyond Lessor's reasonable control. Lessor shall endeavor in good faith to
give at least 24 hours  notice  to Lessee  when any  necessary  interruption  in
service will be made by Lessor. Notwithstanding the preceding sentence, if there
shall occur an  interruption  or  discontinuance  of utilities or services to be
provided  or made  available  by Lessor of such nature that (i) Lessee is unable
to, or does not,  make normal use of the  Premises,  (ii) such  interruption  or
discontinuance  has not been caused in whole or  substantial  part,  directly or
indirectly, by the gross negligence or willful misconduct of Lessee, or Lessee's
agents, employees, contractors,  subcontractors,  subtenants or assignees, (iii)
the interruption or continuance is within the control of Lessor, and (iv) Lessee
shall  have given  written  notice to Lessor  respecting  such  interruption  or
discontinuance  and  Lessor  shall  have  failed  to cure such  interruption  or
discontinuance  for 5  consecutive  business  days after  Lessor  receives  said
notice, then all Base Rent and Additional Rent

                                                         4

<PAGE>



payable  herein  shall  automatically  abate  from the  expiration  of the 5 day
period,  until such time as the  services or  utilities  are  restored or Lessee
begins normal use of the Premises  again,  whichever  occurs  first,  and Lessee
shall  have  the  right  to  terminate   the  Lease  if  the   interruption   or
discontinuance,  which meets the  requirements of (i) - (iv) above continues for
more than 30 days. For purposes of determining  whether there is an interruption
or  discontinuance  of  utilities  or  services,  an outage or series of outages
totalling 6 hours or more  between  7:00 a.m.  and 6:00 p.m. on any day,  Monday
through  Friday,   excluding  Holidays,  shall  constitute  an  interruption  or
discontinuance  of services or  utilities  for such day, but outages that are of
shorter duration shall not be considered. In the event of any such interruption,
however,  Lessor shall use  reasonable  diligence to restore such  service.  For
purposes of this Section,  all existing  improvements  in the Premises  shall be
deemed to be "building standard".

         12. Peaceful Enjoyment.  Lessee shall and may peacefully have, hold and
enjoy the Premises  for the Term,  subject to the terms and  conditions  of this
Lease,  provided that Lessee pays the rentals and other sums herein  recited and
performs all of its covenants and agreements herein contained.  It is understood
and  agreed  that  this  covenant  and any and all  other  covenants  of  Lessor
contained  in this Lease  shall be binding  upon Lessor and its  successors  and
assigns,  but only with  respect  to  breaches  occurring  during  its and their
respective ownership of Lessor's interest hereunder.

         13. Alterations,  Additions and Improvements.  Lessee shall not make or
allow to be made any  alterations  or physical  additions  in or to the Premises
without first obtaining the written  consent of Lessor,  which consent shall not
be unreasonably withheld or delayed, except that Lessee shall not be required to
obtain Lessor's consent for alterations or additions to the Premises the cost of
which do not exceed  $10,000.00 in the aggregate,  provided such  alterations or
additions  do  not  affect  the  structural  integrity  of the  Building  or the
mechanical  systems thereof.  Lessor shall not be liable as a result of any such
consent  for  completeness,  design  sufficiency,  or  compliance  with any law,
ordinance,  order,  rule, or regulation and Lessee shall  indemnify,  defend and
hold Lessor  harmless  from all claims,  demands,  damages,  causes of action or
litigation,  arising out of or resulting from such consent.  Prior to performing
any alterations or additions with the request for consent, Lessee must submit to
Lessor  detailed  plans  and  specifications  for the  proposed  alterations  or
physical additions.  Any and all alterations,  additions or improvements,  other
than that portion of the initial tenant improvements which are to be provided by
Lessor  pursuant to the terms of Exhibit  "B" hereto,  shall be made at Lessee's
sole  expense.  All such  alterations,  additions or  improvements  shall,  upon
completion,  become the  property of Lessor and shall be  surrendered  to Lessor
upon the  termination  of this  Lease by lapse of time or  otherwise;  provided,
however this clause shall not apply to removable equipment,  trade fixtures,  or
furniture  owned by  Lessee  and  which  can be  removed  without  damage to the
Building or the Premises,  or if there will be damage, said damages are repaired
by Lessee at Lessee's expense and Lessor approves the repairs, provided there is
no default by Lessee in any of the terms and conditions of the Lease.

         14.  Exterior  Repairs.  Lessor will keep the exterior of the Building,
including any doors,  windows,  or glass, in repair,  provided Lessee shall give
Lessor written  notice of the necessity for such repairs,  and provided that the
damage thereto shall not have been caused by the negligence of

                                                         5

<PAGE>



Lessee,  its agents,  employees,  licensees or  invitees,  in which event Lessee
shall be responsible therefor for the cost, except as may be provided for in the
Lease. Lessor shall be under no liability for repair, maintenance, alteration or
any other action with reference to any plumbing,  electrical or other mechanical
installation within or serving the Premises or any part thereof,  except for the
service lines  leading to the  Premises.  Lessor agrees that Lessee will receive
the  benefit  of all  warranties  received  by  Lessor on the  improvements  and
mechanical systems.

         15.  Operation by Lessee.  Lessee  agrees to (a) keep the inside of all
glass in the doors and  windows of the  Premises  clean;  (b) keep all  interior
surfaces of the  Premises  clean;  (c) replace  promptly,  at its  expense,  any
cracked or broken  window glass inside the Premises  with glass of like kind and
quality;  (d) maintain the Premises in a clean,  orderly and sanitary  condition
and free of insects,  rodents,  vermin and other  pests;  (e) keep any  garbage,
trash,  rubbish or refuse in  rat-proof  containers  within the  interior of the
Premises until removed from the area; (f) have such garbage,  trash, rubbish and
refuse  removed at its expense on a regular  basis from  location  points and at
such times as designated  by Lessor,  if said service is not provided by Lessor;
(g) keep all mechanical  apparatus free of vibration,  noise or pollution  which
may be transmitted  beyond the Premises;  (h) comply with all laws,  ordinances,
rules and regulations of the Fire Underwriters Rating Bureau now or hereafter in
affect;  (i) conduct its business in all respects in a manner in accordance with
normal customary industry practices and (j) the terms of this Section 15. Lessor
understands that Lessee intends to work with hazardous materials,  but that such
use will comply with all present and future federal,  state and local government
laws, ordinances, orders, rules and regulations.

         In addition,  Lessee shall not (a) place or maintain any merchandise or
other  articles in any  vestibule  or entry of the  Premises,  on the  footwalks
adjacent  thereto or  elsewhere  on the  exterior  of the  Premises  or Building
without the written  reasonable consent of Lessor; (b) permit undue accumulation
of garbage,  trash, rubbish or other refuse within or without the Premises;  (c)
cause  or  permit  objectionable  odors  to  emanate  or be  dispelled  from the
Premises;  (d) occupy,  use or permit the use or occupancy of any portion of the
Premises  for any  business  or purpose  which is  immoral,  disreputable  or in
violation of any legal  direction of any public officer;  or (e) occupy,  use or
permit the use or  occupancy  of any portion of the Premises for any business or
purpose which, in the opinion of Lessor, reasonably formed, constitutes a public
or private nuisance.

         Lessor  shall have the  right,  upon  written  approval  by Lessee,  to
provide for rubbish and refuse removal services as required of Lessee above, and
Lessee  agrees to  reimburse  Lessor for the cost  incurred  in  providing  such
service,  provided the cost of the service  provided by Lessor is  competitively
priced,  within 30 days after  receipt of a statement  setting forth the cost of
such service.

         Lessee  agrees to discharge  all waste  materials  from the Premises in
compliance  with the rules and  regulations as set forth in The Woodlands  Metro
Center Municipal  Utility District Policy Manual - Industrial Waste Discharges -
Permits and Charges - No. R&S-50,  issued July 12, 1979,  with an effective date
of July 12, 1979, as it may be amended from time to time. Lessee shall haul away
for disposal at its own expense,  any waste  material not meeting the  standards
for discharge set forth in the above-referenced manual.

                                                         6

<PAGE>



         Lessee shall  comply,  at Lessee's  cost and expense,  with all private
restrictions  encumbering the Land and all present and future laws,  ordinances,
orders, rules, regulations and requirements of all federal, state, and municipal
governments,  including all  municipal and road utility  districts and municipal
utility  districts,  and  all  departments,  commissions,  boards  and  officers
thereof, and any other body exercising similar functions, which now or hereafter
may be applicable to the Premises,  the improvements in the Premises,  or to the
use or manner of use of the  Premises  or the  improvements,  including  but not
limited to, all  environmental  laws and the Americans With Disabilities Act. In
the event of a  violation  of any  environmental  law by Lessee  and  cleanup of
contamination  is  required,  in addition to all other  remedies of Lessor under
this Lease or at law or in equity,  Lessee shall conduct a Standard 1 cleanup so
that  there  is a total  and  complete  removal  of all  contaminates  from  the
Premises.  Lessee  agrees  that no  such  cleanup  shall  be  subject  to a risk
reduction  standard and no deed recordation notice shall be recorded against the
Premises.

         Lessee  also  agrees to comply  with the Rules and  Regulations  of the
Building,  a copy of which is  attached  as Exhibit  "C".  Lessor may amend said
Rules  and  Regulations,  from time to time,  if  reasonably  necessary  for the
safety,  care, or cleanliness of the Building,  provided that no amendment shall
alter any covenant or provision contained in this Lease. Lessee agrees to comply
with any  amendment  which is made to said rules and  Regulations  in compliance
with the terms of this subsection  after Lessee  receives  written notice of the
amendment.

         16.  Interior  Repairs and  Maintenance.  Except as provided for in the
Lease,  Lessee  will,  at Lessee's  cost and  expense,  keep the interior of the
Premises,   together  with  all  electrical,   plumbing  and  other   mechanical
installations  therein,  all heating  and air  conditioning  equipment,  and all
interior  windows or doors serving the Premises,  in good order and repair,  and
will make all  replacements  thereto as its expense.  Lessee will  surrender the
Premises at the  expiration  or earlier  termination  of this Lease,  in as good
condition as when received,  excepting  depreciation caused by ordinary wear and
tear or casualty  covered by insurance.  Lessee will not overload the electrical
wiring  serving the  Premises or within the  Premises,  and will  install at its
expense,  but only after obtaining  Lessor's  reasonable  written approval,  any
additional  electrical service which may be required in connection with Lessee's
use or occupancy.  Notwithstanding anything herein to the contrary,  Lessor, and
not Lessee,  shall be liable for any and all interior  repairs  which may result
from any  structural  failure of the  Building,  unless  caused by  Lessee,  its
agents, employees or invitees.  Lessee will repair promptly, at its expense, any
damage to the  Premises  caused by bringing  into the  Premises any property for
Lessee's use, or by the installation or removal of such property,  regardless of
fault or by whom such damage was caused,  unless  caused by Lessor,  its agents,
employees or contracts.  Upon execution of this Lease,  Lessee,  at its own cost
and   expense,   shall   enter   into   a   regularly   scheduled   preventative
maintenance/service  contract with Lessor, or a maintenance  contractor approved
by Lessor, for servicing all hot water,  heating, and  air-conditioning  systems
and equipment  within the Premises.  If Lessee fails to make such repairs and/or
to perform  the  maintenance  and  repairs to the  Premises  which are  Lessee's
obligation under this Lease,  Lessor may make same, and Lessee agrees to pay, as
additional  rent, the cost thereof,  plus 10% overhead,  to Lessor promptly upon
Lessor's demand therefor.


                                                         7

<PAGE>



         17. Roof and Walls.  Lessor or its  designee  shall have the  exclusive
right  (a) to  erect  in  connection  with the  construction  thereof  temporary
scaffolds  and other  aids to  construction  on the  exterior  of the  Premises,
provided  that access to the Premises  shall not be denied;  and (b) to install,
maintain,  use, repair and replace within the Premises,  pipes, ducts, conduits,
wires and all other  mechanical  equipment  serving other parts of the Building,
the same to be in locations within the Premises as will not materially interfere
with  Lessee's  use  thereof.  Lessee  shall have no right to penetrate or erect
improvements  on the roof  without the prior  written  consent of Lessor,  which
consent  shall not be  unreasonably  withheld  or delayed,  and any  approval by
Lessor will require Lessee executing Lessor's license agreement. Lessee shall be
liable in damages to Lessor for any breach of this provision,  including damages
for loss of any and all warranties.

         18. Signs and Advertising. Lessee will not place or suffer to be placed
or  maintained  on or  displaced  to the  exterior  of the  Premises,  any sign,
advertising  matter or other  thing of any kind,  and will not place or maintain
any  decoration,  lettering or advertising  matter on the glass of any window or
door of the Premises  without first  obtaining  the written  approval of Lessor,
which  consent  shall not be  unreasonably  withheld  or  delayed.  Lessee  will
maintain any approved sign, decoration,  lettering,  advertising matter or other
thing in good condition and repair at all times.

         19. Entry by Lessor.  Lessee shall  permit  Lessor or Lessor's  agents,
representatives,  or employees to enter upon the Premises at  reasonable  times,
and upon having  given  Lessee  reasonable  advance  notice,  (a) to inspect the
Premises,  to determine  whether Lessee is in compliance  with the terms of this
Lease; (b) to show the Premises to prospective purchasers,  lessees, mortgagees,
bene ficiaries  under trust deeds,  or insurers (but as to  prospective  lessees
only  during  the  last 6  months  of  the  Term),  and  (c)  to  make  repairs,
improvements,  additions and alterations thereto, as Lessor is permitted to make
according to the terms of the Lease. Any inspections of the Premises pursuant to
this subsection shall be at Lessor's cost and expense; provided, however, in the
event it is determined by Lessor that an environmental study should be conducted
on the  Premises and said  environmental  study  determines  that Lessee has not
complied  with all then  existing  environmental  laws,  Lessee shall  reimburse
Lessor  for the cost of the study  within 15 days  after  receipt  of an invoice
setting forth the cost, and Lessee shall promptly take all action necessary,  at
Lessee's sole expense,  to remedy any noncompliance by Lessee discovered by such
study in accordance with Section 15 above.

         20. Liens.  In the event that any mechanic's,  materialmen's,  or other
lien shall at any time be filed against the  Premises,  the Building or the Land
purporting  to be for  work,  labor,  services  or  materials  performed  for or
furnished to Lessee or anyone holding the Premises  through or under Lessee,  or
arising out of any alleged act or  omission of Lessee,  Lessee  shall  forthwith
cause the same to be properly bonded or released.  If Lessee shall fail to cause
such lien to be bonded or released  within 15 days after  being  notified of the
filing thereof, then, in addition to any other right or remedy of Lessor, Lessor
may,  but shall not be  obligated  to,  discharge  the same by posting a bond or
paying the amount  claimed to be due, and the amount so paid by Lessor,  and all
costs and expenses  incurred by Lessor in procuring  the discharge of such lien,
including  reasonable  attorney's  fees,  shall be due and  payable by Lessee to
Lessor as additional rent on the first day of the next succeeding month.

                                                         8

<PAGE>



Lessor shall not be liable for any labor or  materials  furnished to Lessee upon
credit, and that no mechanics',  materialmen's or other liens for any such labor
or  materials  shall attach to or affect the estate or interest of Lessor in and
to the Land or Building.

         21.  Subordination.  Lessee  agrees  that  this  Lease is and  shall be
subordinate to any mortgage or deed of trust which may now or hereafter encumber
the Building or the Land,  and to all renewals,  modifications,  consolidations,
replacements and extensions thereof,  provided,  however, that the holder of any
such mortgage or deed of trust shall agree that Lessee shall not be disturbed in
its possession of the Premises or its rights hereunder  terminated or amended by
the mortgagee, any purchaser at or in lieu of foreclosure or other party so long
as Lessee is not in default under this Lease.  Lessor  agrees to use  reasonable
efforts to obtain a nondisturbance  agreement in a commercially  reasonable form
from its  lender  at the time a  mortgage  or deed of trust is  placed  upon the
Building  or  Land.  In  confirmation  of such  subordination,  Lessee  shall at
Lessor's request execute promptly any appropriate certificate or instrument that
Lessor may reasonably request. In the event of the enforcement by the trustee or
the beneficiary  under a mortgage or deed of trust of the remedies  provided for
by law or by such  mortgage or deed of trust,  Lessee will,  upon request of any
person  or party  succeeding  to the  interest  of  Lessor  as a result  of such
enforcement,  automatically  become the  lessee of such  successor  in  interest
without  change  in the  terms  or other  provisions  of this  Lease;  provided,
however,  that such  successor in interest shall not be bound by (i) any payment
of Base  Rent or  Additional  Rent for more  than one  month in  advance  except
prepayments  in the  nature of  security  for the  performance  by Lessee of its
obligations  under this Lease;  (ii) any amendment or  modifications  under this
Lease  made  without  the  written  consent  of such  trustee,  beneficiary,  or
successor in  interest;  (iii) any default by the prior owner or landlord in the
observance or performance  of any of its covenants or obligations  hereunder any
right of offset  which  Lessee may have had against the prior owner or landlord.
Upon request by any  successor in interest,  Lessee shall execute and deliver an
instrument or instruments confirming the attornment herein provided for.

         Within 15 days  after  Lessor's  request,  Lessee  agrees to execute an
estoppel  certificate  or  other  agreement  certifying  to  Lessor  and/or  any
mortgagee of the  Building  such facts and  agreeing to such  reasonable  notice
provisions as such mortgagee may request in connection with Lessor's  financing,
subject,  however, to the non-disturbance rights of Lessee  above-described.  If
Lessee fails or refuses to give a certificate  hereunder  within the time period
herein  specified,  then  the  information  contained  in  such  certificate  as
submitted by Lessor  shall be deemed  correct for all  purposes,  and all notice
provisions and other matters in the  certificate  shall be deemed agreed to, but
Lessor  shall  have the right to treat  such  failure  or  refusal as default by
Lessee.

         This Lease and all rights of Lessee  hereunder are further  subject and
subordinate  to the extent that the same relate to the Premises to all ground or
underlying  leases  covering  the  Land/or  any part  thereof  which  may now or
hereinafter  affect the Land or the Building,  and any renewals or modifications
thereof;  provided,  however that the holder of any ground  lease or  underlying
leases  covering the Land or the  Building  shall agree that Lessee shall not be
disturbed in its possession of

                                                         9

<PAGE>



the  Premises or its rights  hereunder  terminated  or amended by such holder as
long as Lessee is not in default under this Lease.

         22.  Condemnation.  If the whole or any part of the  Premises  shall be
taken under the power of eminent  domain,  this Lease shall  terminate as to the
part so taken on the date Lessee is required to yield possession  thereof to the
condemning authority. Lessor shall, with reasonable diligence, make such repairs
and  alterations as may be necessary in order to restore the part not taken to a
useful  condition,  and the Base Rent  shall be reduced  proportionately  to the
portion  of the  Premises  so  taken.  If the  amount of the  Premises  so taken
substantially  impairs the usefulness of the Premises for the purposes set forth
in Section 4 , either party may terminate this Lease within 30 days after Lessee
is  dispossessed,  effective  as of the date when  Lessee is  required  to yield
posses sion. All compensation  awarded for any taking shall belong to and be the
property of Lessor.

         23. Fire and Casualty.  In the event of a fire or other casualty in the
Premises,  Lessee  shall  immediately  give  notice  thereof to  Lessor.  If the
Premises,  through  no  fault or  neglect  of  Lessee,  its  agents,  employees,
invitees, licensees or visitors, shall be destroyed by fire or other casualty so
as to render  the  Premises  untenantable,  the rental  herein  shall be reduced
proportionally to the portion of the Premises rendered  untenantable  until such
time as the Premises are made tenantable by Lessor.  If from such cause the same
shall be so damaged that Lessor  shall decide not to rebuild,  then all rent and
other sums owed  hereunder up to the time of such  destruction or casualty shall
be paid by Lessee,  and  thenceforth  this Lease shall cease and come to an end.
Notwithstanding  anything contained herein to the contrary, if within 60 days of
the fire or  casualty  it is  determined  that the  Premises  cannot be restored
within 150 days from the date of the fire or casualty, Lessor shall give written
notice to Lessee.  Lessee  shall have the right  within 60 days from the date of
Lessor's  notice to  terminate  the  Lease.  Further,  notwithstanding  anything
contained  herein to the contrary,  in the event the Building shall be destroyed
or  damaged  prior to the final 2 years of the then  current  Lease Term to such
extent that  rebuilding or repairing  can be completed  within 150 days from the
date of the  damage,  Lessor  shall,  at its sole cost and  expense,  diligently
proceed  forthwith to rebuild and repair said Premises as closely as possible to
the Building to be  constructed  in  accordance  with  Exhibit "B",  except that
Lessor  shall  not be  obligated  for such  repair in an amount in excess of the
insurance proceeds recovered as a result of such damage or which could have been
recovered had Lessor maintained the insurance Lessor was required to maintain in
this Lease.  If the Premises  should be  substantially  damaged by fire or other
casualty  during  the  final 2 years of the  Lease  Term,  Lessor  shall  not be
required to rebuild or repair such damage and at Lessor or Lessee's  option,  by
written  notice to the other  within 60 days after the date of the damage,  this
Lease shall  terminate and all Base Rent and Additional  Rent shall be abated as
of the  date of the  damage.  However,  if  during  the last 2 years of the then
current Lease Term,  Lessor shall exercise said right of termination and at that
time  Lessee  shall  have the right to renew the Lease  Term,  Lessee may render
Lessor's  notice of termination  nugatory and reinstate  Lessor's  obligation to
rebuild,  provided that Lessee,  within 15 days of receipt of Lessor's notice of
termination, exercises its right to renew the Term of the Lease.


                                                        10

<PAGE>



         24.  Casualty  Insurance.  Lessor shall,  at all times during the Term,
maintain a policy or policies of insurance with the premiums  thereon fully paid
in advance, issued by and binding upon some solvent insurance company,  licensed
to do business in the State of Texas, insuring Lessor's interest in the Building
against loss or damage by fire and other hazards  within the coverage of a Texas
standard form of fire and extended  coverage  policy,  for the full  replacement
value thereof,  with payments for losses thereunder  payable solely to Lessor or
its designee.  Lessee shall  maintain in force a like policy  insuring  Lessee's
interest in any furniture,  equipment, machinery, goods or supplies which Lessee
may bring or obtain upon the Premises.

         25. Liability Insurance.  Lessee shall maintain, at its expense, at all
times  during the Term,  a policy or policies of  commercial  general  liability
insurance,  with the premiums  thereon  fully paid in advance,  issued by (i) an
insurance  company  or  companies  rated "A-" or higher  under the most  current
edition of A.M. Best's Key Rating Guide, (ii) a Lloyds of London underwriter, or
(iii) an insurance company agreed to by Lessor. All insurers must be licensed to
do business in the State of Texas. The insurance shall afford  protection of not
less than $1,000,000 combined single limit bodily injury and property damage per
occurrence.  The policy or policies shall name Lessor as an additional  insured.
As to any injury or damage occurring in or on the Premises,  Lessee's  insurance
shall be primary. Lessee's policy shall contain an agreement by the insurer that
such policy, or policies may not be cancelled or materially  modified without 30
days' prior notice to Lessor. Lessee shall provide Lessor a copy of the required
policy or policies,  or a certificate  evidencing the required coverage,  before
beginning  any work in the Premises or taking  occupancy of same.  Additionally,
Lessee shall provide  Lessor  evidence of the renewal of each policy at least 30
days before the expiration of the policy.

         26. Release of Claims; Waiver of Subrogation. Anything in this Lease to
the contrary notwithstanding,  Lessor and Lessee each waive any and all right of
recovery,  claim,  action or cause of action  against the other and its partners
(if any),  and the agents,  officers,  and  employees  of the other party or its
partners, for any loss or damage:

                  (i)      to the Premises,  the Building,  or any  improvements
                           thereto,  or any  personal  property  of  such  party
                           therein, by reason of fire, the elements or any other
                           cause which could have been insured  against  under a
                           Texas  standard  form of fire and  extended  coverage
                           insurance policy, or

                  (ii)     arising out of any business  interruption,  including
                           but not  limited  to loss of  profits,  by  reason of
                           fire, the elements or any other cause,

regardless of cause or origin,  including  the sole or concurrent  negligence of
the other party or its partners,  or the agents,  officers,  or employees of the
other party or its  partners.  Lessor and Lessee  covenant that no insurer shall
hold any right of  subrogation  against the other party for losses which must be
insured  against by the terms of this  Lease.  This  Section  shall  survive the
termination of this Lease.


                                                        11

<PAGE>



         27. Release and Indemnification by Lessee. Subject to Section 26 above,
Lessee  releases  and  agrees  to  defend,  indemnify  and hold  Lessor  and its
partners,  and the agents,  officers and  employees  of Lessor or its  partners,
harmless from and against all claims or causes of action for damage or injury or
death to persons or property occurring on or in the Premises, including, but not
limited to, any claims or causes of action  caused by or resulting  from (i) the
negligence,  but not the gross negligence or willful misconduct of Lessor or its
partners,  or the agents,  officers,  or employees of Lessor or its partners, or
(ii) strict liability or product liability.  Subject to Section 26 above, Lessor
releases and agrees to defend,  indemnify and hold Lessee and its partners,  and
the agents, officers and employees of Lessee or its partners,  harmless from and
against  all claims or causes of action for damage or injury or death to persons
or property occurring on or in the Premises,  including, but not limited to, any
claims or causes of action caused by or resulting from (i) the  negligence,  but
not the gross negligence or willful misconduct of Lessee or its partners, or the
agents,  officers,  or  employees  of Lessee  or its  partners,  or (ii)  strict
liability or product  liability.  This Section shall survive the  termination of
this Lease.

         28.  Holding  Over.  In the event of holding  over by Lessee  after the
expiration or termination of the Term and without the written consent of Lessor,
Lessee shall be a tenant at will and shall pay monthly rent equal to 150% of the
amount of all Base Rent, and  Additional  Rent pay able during the last month of
the Term.  Further,  Lessee shall indemnify Lessor against all actual damages by
any other lessee to whom Lessor may have leased all or any part of the Premises.
Lessor may terminate the tenancy by giving written notice to Lessee.  No holding
over by Lessee,  either with or without the consent and  acquiescence of Lessor,
shall operate to extend the Lease for a longer period than l month.  Any holding
over with the  consent of Lessor in writing  shall  thereafter  constitute  this
Lease a lease from month to month.

         29. Default by Lessee.  If (a) Lessee fails to timely pay any sum to be
paid by Lessee under this Lease and such default  continues  for 5 business days
after  Lessor  delivers  written  notice  of such  failure  to pay to  Lessee or
deposits  written  notice in the U. S. Mail  addressed  to Lessee's  address set
forth in  Section  35; (b) Lessee  fails to perform  any of its other  duties or
obligations under this Lease and such default continues for 20 days after Lessor
delivers  written notice to Lessee or deposits  written notice in the U. S. Mail
addressed to Lessee's address set forth in Section 35, provided such notice sets
forth the nature and extent of such  default.  The period of time to cure such a
default  described in this  subparagraph (b) shall be extended,  provided Lessee
commences to cure such default  within said 20 days and  continues to completion
with due diligence, speed and continuity, said period of extension, however, not
to exceed 40 days from the  expiration of the 20 days;  (c) any of the following
actions  occur and  Lessee  fails to  vigorously  contest  and cause  same to be
removed,  dismissed, or vacated within 30 days from the date of entry or filing:
(i)  Lessee's  interest  under this Lease is levied on under  execution or other
legal  process,  or (ii) any  petition is filed by or against  Lessee to declare
Lessee a bankrupt or to delay,  reduce or modify  Lessee's debts or obligations,
or (iii) any petition under the  Bankruptcy  Code is filed or other action taken
to reorganize or modify Lessee's capital  structure,  or (iv) Lessee is declared
insolvent  according to law, or (v) any general  assignment of Lessee's property
is made for the benefit of creditors, or (vi) a

                                                        12

<PAGE>



receiver or trustee is appointed for Lessee or its property;  (d) Lessee vacates
or abandons  the  Premises  and does not pay rent  provided  for herein;  (e) if
Lessee  is a  corporation,  Lessee  ceases  to  exist as a  corporation  in good
standing  in the State of Texas;  or (f) if  Lessee  is a  partnership  or other
entity, Lessee is dissolved or otherwise  liquidated,  then Lessor may treat the
occurrence of any one or more of the foregoing events as a breach of this Lease.
Upon the occurrence of any of the foregoing events,  at Lessor's option,  Lessor
shall have any one or more of the following described  remedies,  in addition to
all other rights and remedies provided at law or in equity:

                  A. Lessor may terminate this Lease and forthwith repossess the
Premises  and  recover  damages in a sum of money  equal to the total of (i) the
cost of recovering  the Premises,  including the cost of the removal and storage
of any of Lessee's  possessions  left within the Premises,  (ii) the unpaid Base
Rent and  Additional  Rent  earned  at the time of  termination,  plus  interest
thereon at the lesser of 18% or the then maximum  interest rate  permitted to be
charged by applicable law  ("Interest")  from the due date until paid, (iii) the
balance  of the Base Rent and  Additional  Rent for the  remainder  of the Term,
discounted  to its  present  value  at the rate of 6% per  annum,  less the fair
market rental value (allowing a reasonable period for reletting) of the Premises
for said period  (provided  said sum shall not be less than zero),  and (iv) any
other sum of money and damages owed by Lessee to Lessor.

                  B.  Without  terminating  this  Lease,  Lessor  may  terminate
Lessee's  right of possession  and  repossess the Premises by forcible  detainer
suit or  otherwise,  without  demand or notice of any kind to Lessee.  If Lessor
pursues  this  remedy,  Lessor may,  but shall not be  obligated  to,  relet the
Premises for Lessee's account,  for such rent and upon such terms and conditions
as Lessor  deems  satisfactory.  For the  purpose of such  reletting,  Lessor is
authorized  to  decorate  or  to  make  any  repairs,  changes,  alterations  or
modifications  in or to the  Premises  as it  deems  necessary  to  prepare  the
Premises to relet at Lessee's  expense.  If Lessor fails to relet the  Premises,
then Lessee shall pay to Lessor as damages a sum equal to the amount of the Base
Rent and Additional  Rent provided for in this Lease for such period or periods.
If Lessor  relets the Premises  and fails to realize a sufficient  sum from such
reletting after deducting (a) the due and unpaid Base Rent and Additional  Rent,
(b) the accrued Interest thereon, (c) the cost of recovering possession, (d) the
costs  and  expenses  of  all  decorations,  repairs,  changes,  alteration  and
modifications,  and (e) the expense of such  reletting and the collection of the
rent  accruing  therefrom,  then Lessee shall pay to Lessor any such  deficiency
upon demand from time to time.  Lessor may file one or more suits to recover any
sums falling due under this Section from time to time.  Any reletting  shall not
be an election by Lessor to terminate  this Lease unless  Lessor gives a written
notice of such intention to Lessee.  Notwithstanding  any such reletting without
termination, Lessor may at any time thereafter elect to terminate this Lease for
such previous default.

                  C.  Lessor may change  the locks on the  Premises.  The Lessor
will  not  have to give  the  Lessee  a new key  unless  the  Lessee  cures  the
default(s);  the new key will be provided only during Lessor's  regular business
hours.


                                                        13

<PAGE>



         30. Waiver.  Failure of Lessor to declare any default  immediately upon
occurrence thereof, or delay in taking any action in connection therewith, shall
not waive  such  default,  but Lessor  shall have the right to declare  any such
default  at any time and take  such  action  as might be  lawful  or  authorized
hereunder,  either in law or at equity.  Likewise,  failure of Lessee to declare
any default  immediately upon occurrence  thereof, or delay in taking any action
in connection therewith, shall not waive such default, but Lessee shall have the
right to declare  any such  default at any time and take such action as might be
lawful or authorized hereunder, either in law or at equity.

         31.  Lien  for  Rent.  Lessee  hereby  grants  to  Lessor a lien on all
property of Lessee now or hereafter  placed in or upon the Premises,  including,
but  not  limited  to,  all  goods,  wares,  fixtures,   machinery,   equipment,
furnishings, and other articles of personal property , and all proceeds from the
sale or lease  thereof  (except such part of any  property as may be  exchanged,
replaced or sold from time to time in the ordinary course of business, operation
or trade),  and such property shall be and remain subject to such lien of Lessor
for payment of all rent and other sums agreed to be paid by Lessee herein.  This
Lease shall constitute a security  agreement under the Texas Uniform  Commercial
Code  ("TUCC") so that Lessor shall have and may enforce a security  interest in
all property of Lessee now or hereafter placed in or on the Premises,  including
but not limited to all goods, wares, fixtures, machinery, equipment, furnishings
and other articles of personal  property now or hereafter  placed in or upon the
Premises by Lessee,  and all  proceeds  from the sale or lease  thereof.  Lessee
agrees to execute as debtor such financing statement or statements as Lessor may
now or  hereafter  reasonably  request in order that such  security  interest or
interests may be perfected  pursuant to said TUCC. Lessor may at its election at
any time file a copy of this Lease as a financing statement.  Lessor, as secured
party,  shall be entitled to all of the rights and  remedies  afforded a secured
party under said TUCC,  which  rights and  remedies  shall be in addition to and
cumulative of the  landlord's  liens and rights  provided by law or by the other
terms and provisions of this Lease.

         Notwithstanding  anything  contained  herein  to the  contrary,  Lessor
agrees  to  subordinate  its liens to bona  fide  liens to secure  loans for the
purchase  of  furniture,   equipment,  and  inventory  using  the  subordination
agreement substantially in the form attached hereto as Exhibit "D".

         32. Assignment by Lessor. Lessor shall have the right to sell, transfer
or assign, in whole or in part, all of its rights and obligations  hereunder and
in the  Building  and the Land.  In such event and upon the  assumption  by such
transferee of Lessor's obligations hereunder, no further liability or obligation
shall thereafter accrue against Lessor hereunder.

         33.  Assignment  by Lessee.  Lessee  shall not assign this Lease or any
interest  therein,  nor sublet the  Premises or any part thereof or any right or
privilege  appurtenant  thereto,  nor permit any other person, firm or entity to
occupy or use the Premises or any portion  thereof  without first  obtaining the
written consent of Lessor,  which consent shall not be unreasonably  withheld or
delayed.  Lessor shall have the right, at its option, to terminate this Lease as
to any portion of the Premises covered by a proposed assignment or sublease,  or
to approve any such  assignment or sublease only upon the condition that (a) 50%
of all rentals,  after all reasonable expenses associated with the assignment or
sublease are deducted, paid by the assignee or sublessee in excess of the

                                                        14

<PAGE>



rentals  due from  Lessee  hereunder,  shall be paid  directly  to  Lessor,  the
proposed  assignee or  sublessee  is  financially  capable of assuming  Lessee's
obligations  hereunder,  in the sole  judgment of Lessor,  and (b) the  proposed
assignee or sublessee  agrees to use the Premises only for the uses permitted by
Lessee  under  this  Lease,  and to  comply  with  all of the  other  terms  and
conditions  of this  Lease.  Notwithstanding  anything  contained  herein to the
contrary,  if Lessor elects to terminate the Lease  pursuant to this Section 33,
Lessee,  no more than once during the initial  Term,  may rescind its request to
assign the Lease or sublet the Premises  within 10 business days after  Lessor's
notice  of  termination.  Consent  by  Lessor  to  one  assignment,  subletting,
occupation  or use by another  person shall not be deemed to be a consent to any
subsequent  assignment,  subletting,  occupation  or use by the same or  another
person.  Consent to an  assignment  or sublease  shall not  release  Lessee from
liability for the continued  performance  of the terms and provisions to be kept
and performed by Lessee  hereunder,  unless Lessor  specifically  and in writing
releases Lessee from said liability. In addition, an amendment, modification, or
extension of the Lease after the assignment or sublease shall not release Lessee
from  liability for the continued  performance of the terms and provisions to be
performed by Lessee hereunder.  Any assignment or subletting by operation of law
or otherwise,  (including without limitation, a transfer of controlling interest
in  Lessee  to any other  person,  firm or  entity)  without  the prior  written
reasonable consent of Lessor,  shall be void and shall, at the option of Lessor,
terminate  this Lease.  Lessee  covenants and agrees that when the prior written
consent of Lessor is obtained,  and in the event the subletting or assignment is
to be arranged through public  advertisement or listing of any kind, Lessee will
treat all  applications  for sublease or assignment in a uniform manner and will
award leases  according to objective  standards.  No decision on any application
shall be made on the grounds of the  applicant's  race,  color,  religion,  sex,
handicap, familial status, or national origin.

         Notwithstanding  anything contained to the contrary,  it is agreed that
the  requirement  for prior written consent in this Section 33, an assignment or
subletting  by operation of the transfer of the  controlling  interest in Lessee
relates to the protection of Lessor's  economic  rights and interests under this
Lease. The requirement for receiving Lessor's prior written consent shall not be
necessary  if any such  transfer  does not have an  adverse  impact on  Lessor's
economic  rights and  interests.  "Transfer of the  controlling  interest",  for
purposes of this Section 33 is defined to mean the transfer or accumulation,  by
or in any one entity or person, of twenty percent (20%) or more of the corporate
shares or the voting rights that accompany ownership of corporate shares.

         34.  Notices.  Any notice required or permitted to be given pursuant to
the terms of this Lease shall be sent by certified or  registered  U.S.  mail to
Lessor at 2201 Timberloch  Place,  The Woodlands,  Texas 77380,  Attn:  Property
Management,  and to Lessee at 8707 Technology Forest Place, The Woodlands, Texas
77380.  The place to which such  notices  shall be sent may be changed by either
party giving notice of such change to the other party in the manner  hereinabove
provided.  A notice  shall be deemed  given and received on the 3rd business day
following deposit in the U. S.
Mail as provided above.

         35.  Severability.  If  any of  the  provisions  of  this  Lease  shall
contravene  or be invalid under the laws of the  particular  state,  county,  or
jurisdiction where applied, such contravention or

                                                        15

<PAGE>



invalidity  shall not invalidate the Lease or any other portions thereof and the
remainder  of  this  Lease  or the  application  thereof  to  other  persons  or
circumstances shall not be affected thereby.

         36. Corporate Authority. If Lessee signs as a corporation,  each of the
persons  executing  this Lease on behalf of Lessee  represents and warrants that
Lessee is a duly  organized  and  existing  corporation,  that Lessee has and is
qualified  to do  business  in Texas,  that the  corporation  has full right and
authority  to enter into this Lease,  and that all persons  signing on behalf of
the corporation were authorized to do so by appropriate corporate actions.

         37.  Title.  This Lease is subject to all matters of record in the Real
Property Records of Montgomery County, Texas. By execution of this Lease, Lessee
consents to all plats and replats of the Land,  if any, in  compliance  with all
applicable laws.

         38. Not an Offer.  The  submission of this Lease to Lessee shall not be
construed as an offer,  nor shall  Lessee have any rights with  respect  thereto
unless Lessor executes a copy of this Lease and delivers the same to Lessee.

         39.  Exhibits,  Riders  and  Addenda.  This  Lease  also  includes  and
incorporates herein for all purposes all attached Exhibits, Riders, and Addenda,
if any.

         40. Joint and Several  Tenancy.  If more than one person  executes this
Lease as Lessee, their obligations  hereunder are joint and several, and any act
or notice of or to, or refund to, or the  signature of, any one or more of them,
in  relation  to the  renewal or  termination  of this  Lease,  or under or with
respect to any of the terms hereof shall be fully binding on each and all of the
persons executing this Lease as a Lessee.

         41. Binding  Effect.  This Lease shall be binding upon and inure to the
benefit of the heirs, successors or assigns of Lessor and Lessee, subject to the
limitation on subleasing and assignment herein contained.

         42. Entire  Agreement.  This Lease shall  constitute  the sole and only
agreement  of Lessor and Lessee  with regard to the Lease of the  Premises,  and
shall supercede any prior or contemporaneous  oral or written  agreements.  This
Lease  may not be  altered,  changed  or  amended,  except by an  instrument  in
writing, signed by both parties hereto.

         43. Pronouns.  Pronouns which refer to either Lessor or Lessee shall be
construed to mean the appropriate number and gender intended.

         44. Force  Majeure.  If either party shall be delayed or prevented from
the performance of any act required hereunder by reason of acts of God, strikes,
lockouts,   labor  troubles,   inability  to  procure   materials,   restrictive
governmental  laws or  regulations  or other cause  without fault and beyond the
control of the party obligated (Lessee's financial inability,  such as inability
to obtain financing or lack of capital, excepted), performance of such act shall
be excused for the period of

                                                        16

<PAGE>


the delay,  and the period for the performance of any such act shall be extended
by a period  equal to the period of such delay;  provided,  however,  nothing in
this Section shall excuse Lessee from the prompt  payment of any rental or other
charge  required  of  Lessee  hereunder,  except  as may be  expressly  provided
elsewhere in this Lease.

         45.  General.  Time is of the  essence  of this  Lease.  All rights and
remedies  of Lessor and Lessee  under this Lease  shall be  cumulative  and none
shall  exclude any other rights or remedies  allowed by law. This Lease shall be
declared to be a Texas  lease,  and all of the terms  hereof  shall be construed
according  to the laws of the State of Texas.  Said Lease  shall be  performable
only in Montgomery  County,  Texas, and venue for any action hereunder shall lie
exclusively in Montgomery  County,  Texas or in the Southern  District of Texas,
Houston Division, as appropriate.

         IN TESTIMONY  WHEREOF,  the parties  hereto have executed this Lease in
multiple   counterparts,   each  of  which  shall  constitute  an  original  but
collectively shall constitute only one document,  such execution to be effective
on the date first above written.

                                     LESSOR

Date: April 4, 1997                  THE WOODLANDS CORPORATION



                                        By:         s/s: Michael H. Richmond
                                                         -------------------
                                      Name:         Michael H. Richmond
                                     Title:         Executive Vice President


Originator
Legal
Financial
- ------------ ---------



                                     LESSEE

Date:  April 4, 1997                 ARONEX PHARMACEUTICALS, INC.


                                        By:        s/s: James M. Chubb
                                                        --------------
                                      Name:        James M. Chubb
                                     Title:        President

                                                        17





<TABLE>
                            ARONEX PHARMACEUTICALS, INC.
                                                                    Exhibit 11.1
The following  reflects the information used in calculating the number of shares
 in the  computation  of net loss per share for each of the periods set forth in
 the Statements of Operations.

<CAPTION>
                                                                Average
                                    Days      Shares            Shares               Loss Per
                        Shares   Outstanding   X Days         Outstanding    Loss     Share
<S>                                 <C>     <C>           <C>  <C>        <C>          <C>
Six Months Ended June 30, 1996:
                       10,380,056    1       10,380,056
                       10,390,003    10     103,900,030
                       10,409,608    4       41,638,432
                       10,418,676    2       20,837,352
                       10,478,786    1       10,478,786
                       10,046,458    3       30,139,374
                       10,598,792    1       10,598,792
                       10,678,561    2       21,357,122
                       10,680,653    1       10,680,653
                       10,680,903    3       32,042,709
                       10,710,132    4       42,840,528
                       10,718,504    6       64,311,024
                       10,727,170    4       42,908,680
                       10,728,565    1       10,728,565
                       10,729,263    1       10,729,263
                       10,729,394    7       75,105,758
                       10,731,487    19     203,898,253
                       10,742,559    7       75,197,913
                       10,771,115    2       21,542,230
                       10,775,477    2       21,550,954
                       10,776,991    4       43,107,964
                       10,784,842    1       10,784,842
                       10,812,921    1       10,812,921
                       10,832,546    2       21,665,092
                       10,847,725    3       32,543,175
                       10,848,023    5       54,240,115
                       10,849,767    7       75,948,369
                       10,851,626    3       32,554,878
                       10,858,605    1       10,858,605
                       10,862,095    2       21,724,190
                       10,962,004    1       10,962,004
                       10,962,593    4       43,850,372
                       10,965,241    2       21,930,482
                       10,965,939    1       10,965,939
                       10,967,993    6       65,807,958
                       10,972,354    5       54,861,770
                       10,977,356    2       21,954,712
                       10,978,310    7       76,848,170
                       10,983,980    4       43,935,920
                       10,989,215    1       10,989,215
                       13,992,587    1       13,992,587
                       13,996,077    1       13,996,077
                       13,996,949    6       83,981,694
                       14,446,949    1       14,446,949
                       14,453,492    5       72,267,460
                       14,456,109    5       72,280,545
                       14,465,806    1       14,465,806
                       14,472,786    2       28,945,572
                       14,473,658    1       14,473,658
                       14,478,658    3       43,435,974
                       14,481,500    1       14,481,500
                       14,483,680    3       43,451,040
                       14,484,059    1       14,484,059
                       14,485,899    2       28,971,798
                       14,488,079    3       43,464,237
                       14,526,802    3       43,580,406
                                    182     2,097,932,529/182  11,527,102 (4,400,000)  (0.38)



<PAGE>


                            ARONEX PHARMACEUTICALS, INC.
                                                                        Exhibit 11.1
The following  reflects the information used in calculating the number of shares
 in the  computation  of net loss per share for each of the periods set forth in
 the Statements of Operations.


                                                                Average
                                    Days      Shares            Shares               Loss Per
                        Shares   Outstanding   X Days         Outstanding    Loss     Share
Six Months Ended June 30, 1997:

                       14,597,247    8      116,777,976
                       14,606,972    12     175,283,664
                       14,612,023    4       58,448,092
                       14,612,499    21     306,862,479
                       14,615,983    6       87,695,898
                       14,616,981    1       14,616,981
                       14,624,239    5       73,121,195
                       14,625,111    2       29,250,222
                       14,627,695    7      102,393,865
                       14,628,567    6       87,771,402
                       14,640,311    6       87,841,866
                       14,643,658    6       87,861,948
                       14,644,672    1       14,644,672
                       14,644,816    7      102,513,712
                       14,644,982    2       29,289,964
                       14,645,277    4       58,581,108
                       14,665,277    22     322,636,094
                       14,665,665    9      131,990,985
                       14,674,453    19     278,814,607
                       14,678,042    6       88,068,252
                       14,680,055    7      102,760,385
                       14,680,344    19     278,926,536
                       14,687,394    1       14,687,394
                                    181   2,650,839,297/181  14,645,521 (6,294,000)  (0.43)


                                
<PAGE>


                            ARONEX PHARMACEUTICALS, INC.
                                                                        Exhibit 11.1
The following  reflects the information used in calculating the number of shares
 in the  computation  of net loss per share for each of the periods set forth in
 the Statements of Operations.


                                                                Average
                                    Days      Shares            Shares               Loss Per
                        Shares   Outstanding   X Days         Outstanding    Loss     Share
Quarter Ended June 30, 1996:
                       10,847,725    5       54,238,625
                       10,848,023    7       75,936,161
                       10,849,767    3       32,549,301
                       10,851,626    1       10,851,626
                       10,858,605    2       21,717,210
                       10,862,095    1       10,862,095
                       10,962,004    4       43,848,016
                       10,962,593    2       21,925,186
                       10,965,241    1       10,965,241
                       10,965,939    6       65,795,634
                       10,967,993    5       54,839,965
                       10,972,354    2       21,944,708
                       10,977,356    7       76,841,492
                       10,978,310    4       43,913,240
                       10,983,980    1       10,983,980
                       10,989,215    1       10,989,215
                       13,992,587    1       13,992,587
                       13,996,077    6       83,976,462
                       13,996,949    1       13,996,949
                       14,446,949    5       72,234,745
                       14,453,492    5       72,267,460
                       14,456,109    1       14,456,109
                       14,456,806    2       28,913,612
                       14,472,786    1       14,472,786
                       14,473,658    3       43,420,974
                       14,478,658    1       14,478,658
                       14,481,500    3       43,444,500
                       14,483,680    1       14,483,680
                       14,484,059    2       28,968,118
                       14,485,899    3       43,457,697
                       14,488,079    3       43,464,237
                       14,526,802    1       14,526,802
                                     91   1,128,757,071 /91  12,404,122 (2,327,000)  (0.19)

Quarter Ended June 30, 1997:                          0
                       14,644,816    2       29,289,632
                       14,644,982    2       29,289,964
                       14,645,277    4       58,581,108
                       14,665,277    22     322,636,094
                       14,665,665    9      131,990,985
                       14,674,453    19     278,814,607
                       14,678,042    6       88,068,252
                       14,680,055    7      102,760,385
                       14,680,344    19     278,926,536
                       14,687,394    1       14,687,394
                                     91   1,335,044,957 /91  14,670,824 (3,201,000)  (0.22)

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                                                 5
               <LEGEND> THIS SCHEDULE  CONTAINS  SUMMARY  FINANCIAL  INFORMATION
          EXTRACTED  FROM THE FINANCIAL  STATEMENTS  OF ARONEX  PHARMACEUTICALS,
          INC.  SET FORTH IN THE  COMPANY'S  FORM 10-Q FOR THE SIX MONTHS  ENDED
          JUNE 30, 1997 AND IS  QUALIFIED  IN ITS  ENTIRETY BY REFERENCE TO SUCH
          FINANCIAL STATEMENTS.</LEGEND>
<MULTIPLIER>                                                              1
       
<S>                                                             <C>
<PERIOD-TYPE>                                                         6-MOS
<FISCAL-YEAR-END>                                               DEC-31-1997
<PERIOD-END>                                                    JUN-30-1997
<CASH>                                                            6,233,000
<SECURITIES>                                                     29,233,000
<RECEIVABLES>                                                             0
<ALLOWANCES>                                                              0
<INVENTORY>                                                               0
<CURRENT-ASSETS>                                                 32,542,000
<PP&E>                                                            4,772,000
<DEPRECIATION>                                                    3,030,000
<TOTAL-ASSETS>                                                   38,196,000
<CURRENT-LIABILITIES>                                             3,568,000
<BONDS>                                                                   0
<COMMON>                                                             15,000
                                                     0
                                                               0
<OTHER-SE>                                                       34,595,000
<TOTAL-LIABILITY-AND-EQUITY>                                     34,610,000
<SALES>                                                                   0
<TOTAL-REVENUES>                                                  1,439,000
<CGS>                                                                     0
<TOTAL-COSTS>                                                             0
<OTHER-EXPENSES>                                                  7,690,000
<LOSS-PROVISION>                                                          0
<INTEREST-EXPENSE>                                                   43,000
<INCOME-PRETAX>                                                 (6,294,000)
<INCOME-TAX>                                                              0
<INCOME-CONTINUING>                                             (6,294,000)
<DISCONTINUED>                                                            0
<EXTRAORDINARY>                                                           0
<CHANGES>                                                                 0
<NET-INCOME>                                                    (6,294,000)
<EPS-PRIMARY>                                                         (.43)
<EPS-DILUTED>                                                         (.43)
        

</TABLE>


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