ARONEX PHARMACEUTICALS INC
10-Q, 1997-05-15
PHARMACEUTICAL PREPARATIONS
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<PAGE>
 
                                 UNITED STATES
                      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 March 31, 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 offices)        (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 MARCH 31, 1997
- -----------------------------                    -----------------------------
Common Stock, $.001 par value                         14,644,816 shares
<PAGE>
 
                         ARONEX PHARMACEUTICALS, INC.
                        QUARTERLY PERIOD MARCH 31, 1997

                                     INDEX

<TABLE> 
<CAPTION> 
                                                                                                            PAGE
<S>                                                                                                         <C>  
FACTORS AFFECTING FORWARD LOOKING STATEMENTS...............................................................   3

PART I.  FINANCIAL INFORMATION

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

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

         Statements of Operations:
           Three Months Ended March 31, 1996 and March 31, 1997
           (unaudited) and for the Period from Inception (June 13, 1986)
           through March 31, 1997 (unaudited)..............................................................   5

         Statements of Cash Flows:
           Three Months Ended March 31, 1996 and March 31, 1997
           (unaudited) and for the Period from Inception (June 13, 1986)
           through March 31, 1997 (unaudited)..............................................................   6

         Notes to Financial Statements - March 31, 1997....................................................   7

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

PART II. OTHER INFORMATION

Item 6   Exhibits and Reports on Form 8-K..................................................................  11

SIGNATURES.................................................................................................  12

EXHIBITS
</TABLE> 

                                      -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>
 
                                BALANCE SHEETS
                 (ALL AMOUNTS IN THOUSANDS, EXCEPT SHARE DATA)

                                    ASSETS
<TABLE>
<CAPTION>
                                                                                            MARCH 31,
                                                                         DECEMBER 31,         1997  
                                                                             1996         (UNAUDITED)
                                                                       -------------     ------------
<S>                                                                      <C>               <C>      
Current Assets:
  Cash and cash equivalents...........................................  $      4,179      $     3,047
  Short-term investments..............................................        30,414           27,068
  Accounts receivable - affiliates....................................            78               --
  Prepaid expenses and other assets...................................           663            1,250
                                                                       -------------     ------------
       Total current assets...........................................        35,334           31,365

Long-term investments.................................................         6,795            8,265
Furniture, equipment and leasehold improvements, net..................         2,152            1,986
                                                                       -------------     ------------
       Total assets................................................... $      44,281     $     41,616
                                                                       ==============    ============
</TABLE>

                     LIABILITIES AND STOCKHOLDERS' EQUITY
<TABLE>
<CAPTION>
<S>                                                                    <C>               <C> 
Current liabilities:
  Accounts payable and accrued expenses............................... $       1,191            1,440
  Accrued payroll.....................................................           126              126
  Advance payable to Genzyme..........................................         2,000            2,000
  Current portion of other notes payable..............................           325              325
  Current portion of obligations under capital leases.................            16               16
                                                                       -------------     ------------
       Total current liabilities......................................         3,658            3,907

Long-term obligations:
  Other notes payable, net of current portion......................... $         121     $         62
  Obligations under capital leases, net of current portion............            25               21
                                                                       -------------     ------------
       Total long-term obligations....................................           146               83

Commitments and contingencies
Stockholders' equity:
  Preferred stock $.001 par value, 10,000,000 shares authorized,
   none issued and outstanding........................................            --               --
  Common stock $.001 par value, 75,000,000 shares authorized,
   14,597,247 and 14,664,816 shares issued and outstanding, 
   respectively.......................................................            15               15
  Additional paid-in capital..........................................        93,742           93,858
  Common stock warrants...............................................           968              968
  Treasury stock......................................................           (11)             (11)
  Deferred compensation...............................................        (1,949)          (1,792)
  Unrealized loss on investments......................................           (75)            (106)
  Deficit accumulated during development stage........................       (52,213)         (55,306)
                                                                       -------------     ------------
       Total stockholders' equity.....................................        40,477           37,626
                                                                       -------------     ------------
       Total liabilities and stockholders' equity..................... $      44,281     $     41,616
                                                                       =============     ============
</TABLE>

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

                                      -4-
<PAGE>
 
                           STATEMENTS OF OPERATIONS
            (ALL AMOUNTS IN THOUSANDS, EXCEPT LOSS PER SHARE DATA)
                                  (UNAUDITED)


                                                                    
                                                                      
                                                                    PERIOD FROM
                                                                     INCEPTION 
                                                                     (JUNE 13, 
                                          THREE MONTHS ENDED           1986)   
                                               MARCH 31,              THROUGH  
                                         --------------------         MARCH 31,
                                            1996          1997          1997 
                                         -----------   -----------  -----------
Revenues:
  Interest income......................  $       142   $       592   $    4,114
  Research and development grants
    and contracts......................          543           286        4,495
                                         -----------   -----------  -----------
       Total revenues..................          685           878        8,609
                                         -----------   -----------  -----------
Expenses:
  Research and development.............        2,322         3,485       42,627
  Purchase of in-process research
    and development....................           --            --        8,625
  General and administrative...........          395           456       11,619
  Interest expense.....................           41            30        1,044
                                         -----------   -----------  -----------
       Total expenses..................        2,758         3,971       63,915
                                         -----------   -----------  -----------
Net loss...............................  $    (2,073)  $    (3,093) $   (55,306)
                                         ===========   ===========  ===========
Net loss per share.....................  $     (0.19)  $     (0.21)
                                         ===========   ===========

Weighted average shares used in
  computing net loss per share.........       10,647        14,620
 
 
  The accompanying notes are an integral part of these financial statements.

                                      -5-
<PAGE>
 
                           STATEMENTS OF CASH FLOWS
                          (ALL AMOUNTS IN THOUSANDS)
                                  (UNAUDITED)
<TABLE> 
<CAPTION> 
                                                                                                PERIOD FROM  
                                                                                                 INCEPTION   
                                                                                                 (JUNE 13,   
                                                                     THREE MONTHS ENDED            1986)     
                                                                          MARCH 31,               THROUGH    
                                                                    --------------------------    MARCH 31,  
                                                                        1996          1997          1997     
                                                                    ------------   -----------   -----------  
<S>                                                                 <C>            <C>           <C> 
Cash flows from operating activities:                                                                       
  Net loss........................................................  $     (2,073)  $    (3,093)  $   (55,306)
  Adjustments to reconcile net loss to net cash provided by                                                 
    (used in) operating activities-                                                                         
      Depreciation and amortization                                          244           259         3,146   
      Compensation expense related to stock and stock options                131           193         2,835  
      Charge for purchase of in-process research and development              --            --         8,547  
      Unrealized loss on investment                                          (50)          (31)         (106) 
      Acquisition costs, net of cash received                                 --            --          (270) 
      Loss in affiliate                                                       50            --           500  
      Changes in assets and liabilities:                                                                       
        Decrease (increase) in prepaid expenses and other assets             108          (587)       (1,065) 
        Decrease in accounts receivable - affiliates                         165            78            --  
        Increase (decrease) in accounts payable and accrued                                                  
          expenses                                                          (773)          249         1,493   
        Increase in deferred revenue                                          50            --          (353)
      Accrued interest payable converted to stock                             --            --            97
                                                                    ------------   -----------   ----------- 
          Net cash used in operating activities                           (2,148)       (2,932)      (40,482)
                                                                                                            
Cash flows from investing activities:                                                                       
  Net sales (purchases) of investments                                     2,530         1,876       (29,598)
  Purchase of furniture, equipment and leasehold improvements                (38)          (93)       (3,862)
  Investment in affiliate                                                     --            --          (500)
                                                                    ------------   -----------   ----------- 
          Net cash provided by (used in) investing activities              2,492         1,783       (33,960)
                                                                                                            
Cash flows from financing activities:                                                                       
  Proceeds from notes payable                                                 --            --         4,672
  Repayment of notes payable and principal payments under capital                                           
    lease obligations                                                        (77)          (63)       (2,249)
  Purchase of treasury stock                                                  --            --           (11)
  Proceeds from issuance of stock                                          2,122            80        75,077
                                                                    ------------   -----------   ----------- 
          Net cash provided by (used in) financing activities              2,045            17        77,489
                                                                    ------------   -----------   ----------- 
Net increase (decrease) in cash and cash equivalents                       2,389        (1,132)           --
Cash and cash equivalents at beginning of period                           7,781         4,179            --
                                                                    ------------   -----------   ----------- 
Cash and cash equivalents at end of period                          $     10,170   $     3,047   $     3,047
                                                                    ============   ===========   =========== 
Supplemental disclosures of cash flow information:
  Cash paid during the period for interest                          $         41   $        20   $       868
Supplemental schedule of noncash financing activities:
  Conversion of notes payable and accrued interest to 
    common stock                                                    $         --   $        --   $     3,043
</TABLE>


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

                                      -6-
<PAGE>
 
                         NOTES TO FINANCIAL STATEMENTS
                                MARCH 31, 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 1998.  Accordingly, there can be no
assurance of the Company's future success.

     The balance sheet at March 31, 1997 and the related statements of
operations and cash flows for the three month periods ending March 31, 1997 and
1996 and the period from inception (June 13, 1986) through March 31, 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 March 31, 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
$27,068,000, 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
$6,500,000, 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 March 31, 1997.  The Company currently has no trading securities.

                                      -7-
<PAGE>
 
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.   SUBSEQUENT EVENT

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

                                      -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
$55.3 million through March 31, 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 MONTH PERIODS ENDED MARCH 31, 1996 AND 1997

     Revenues from research and development grants and contracts were $286,000
and $543,000 for the three months ended March 31, 1997 and 1996, respectively.
The main reasons for the $257,000 decrease are as follows: a decrease of
$300,000 in revenues from Hoechst Marion Roussel, Inc. ("Hoechst") and a
decrease of $73,000 from Small Business Innovative Research ("SBIR") grants, as
the Hoechst agreement terminated at the end of 1996 and no SBIR grants have been
received for 1997.  These decreases were partially offset by $150,000 in revenue
from the Company's license agreement with Boehringer Mannheim GmbH.
 
     Interest income on cash, cash equivalents and investments was $592,000 and
$142,000 for the three months ended March 31, 1997 and 1996, respectively.  The
increase of $450,000 was primarily due to an increase of funds available for
investment in 1997 resulting from cash received from the completion of a stock
offering in May 1996.

     Research and development expenses were $3,485,000 in the first quarter of
1997 compared to $2,322,000 in the first quarter of 1996.  The increase of
$1,163,000 was primarily due to an increase of $204,000 in pharmaceutical
development salaries and payroll costs, including cost relating to the hiring of
a Vice President of Pharmaceutical Development and Operations, an increase of
$522,000 in drug manufacturing costs relating mainly to Nyotran/(TM)/ and
Zintevir/(TM)/ and an increase of $249,000 in outside pharmacology studies
relating to Nyotran/(TM)/ and Atrogen/(TM)/.

     General and administrative expenses were $456,000 in the first quarter of
1997 and $395,000 in the first quarter of 1996 due primarily to increased
salaries, including three new positions, and payroll costs.

     Interest expense was $30,000 and $41,000 for the three months ended 
March 31, 1997 and 1996, respectively. The $11,000 decrease in interest expense
resulted primarily from a decrease in the amount of laboratory equipment
obtained through leases and promissory notes payable.

     Net loss for the first quarter of 1997 increased by $1,020,000 to
$2,073,000 compared to $3,093,000 for the first quarter of 1996, due mainly 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 March 31, 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 Atrogen/(TM)/, 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 March 31, 1997, the
Company received aggregate net proceeds of approximately $6.5 million from the
exercise of certain warrants 

                                      -9-
<PAGE>
 
issued in its 1995 merger with Oncologix, Inc. From its inception until March
31, 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.

     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 $2.1 million and $2.9
million was used in operating activities during the first quarter of 1996 and
1997, respectively.  The Company had cash, cash-equivalents and short-term and
long-term investments of $38.4 million as of March 31, 1997, consisting
primarily of cash and money market accounts, and United States government
securities and investment grade corporate bonds.

     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 1998.  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
or 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.

                                      -10-
<PAGE>
 
PART II.  OTHER INFORMATION


ITEM 6.   EXHIBITS AND REPORTS ON FORM 8-K

          (a)  Exhibits

              +10.1  Amendment No. 3 to License and Development Agreement
                     between the Company and Genzyme Corporation.

               10.2  Amendment No. 3 to Stock Purchase Agreement between the
                     Company and Genzyme Corporation.

               10.3  Employment agreement dated December 5, 1996 between the
                     Company and Praveen Tyle, Ph.D.

               10.4  Employment agreement dated February 25, 1997 between the
                     Company and David S. Gordon, M.D.

               11.1  Statement regarding computation of per share earnings.

               27.1  Financial data schedule.

          (b)  Reports on Form 8-K

               None

 
+ Confidential treatment has been requested.  The copy filed as an exhibit
  omits the information subject to the confidentiality request.


                                     -11-
<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:    May 7, 1997                   By:  /s/  JAMES M. CHUBB
                                             ------------------------------
                                             James M. Chubb, Ph.D.
                                             President and Chief 
                                             Executive Officer



Dated:    May 7, 1997                   By:  /s/  TERANCE A. MURNANE
                                             ------------------------------
                                             Terance A. Murnane
                                             Controller

                                      -12-

<PAGE>
 
                                                                    EXHIBIT 10.1

                                AMENDMENT NO. 3
                                      TO
                       LICENSE AND DEVELOPMENT AGREEMENT

     This Amendment No. 3 to License and Development Agreement  (this
"Amendment") is made as of the 25th day of March, 1997 (the "Effective Date") by
and between Aronex Pharmaceuticals, Inc., a Delaware corporation ("Aronex"), and
Genzyme Corporation, a Massachusetts corporation ("Genzyme"). Capitalized terms
used without definition in this Amendment shall have the meanings given to such
terms in the Development Agreement (as defined below).

                                    RECITALS

     WHEREAS, Aronex (f/k/a Argus Pharmaceuticals, Inc.) and Genzyme entered
into a License and Development Agreement dated September 10, 1993 (as
subsequently amended by amendments dated September 8, 1995 and September 10,
1996, the "Development Agreement") relating to the development, license,
manufacture, marketing and sale of pharmaceutical compositions incorporating
"AR-623" (also known as "Atragen/(TM)/"); and

     WHEREAS, Aronex and Genzyme desire to amend the Development Agreement (i)
to release Genzyme from any obligation to perform further development work for
AR-623 and (ii) to convert the license granted to Genzyme in the Development
Agreement to an option to market and sell Products as provided herein; and

     WHEREAS, Aronex is willing to assume certain responsibility for further
development work for AR-623 and marketing and sales as provided herein;

     NOW, THEREFORE, in consideration of the foregoing and the mutual covenants
contained herein, Aronex and Genzyme agree as follows:

     1.   TERMINATION OF LICENSE; GRANT OF MARKETING RIGHTS OPTION TO GENZYME.
The license granted to Genzyme pursuant to Article 2 of the Development
Agreement is hereby terminated and shall be of no further force and effect.
Article 2 of the Development Agreement is hereby amended and restated to read in
its entirety as follows:

          2.   MARKETING RIGHTS.

          2.1  Genzyme Option.  Subject to the terms and conditions of this
     Agreement, Genzyme shall have the option (the "Option"), exercisable in its
     sole discretion, to obtain (i) the exclusive right (with the right to
     sublicense) to use, market, import, export and sell any Product in the
     Field throughout the world excluding the United States and its territories
     and possessions and (ii) the right to co-promote with Aronex pursuant to
     Section 5.3 any Product in the Field in the United States and its
     territories and possessions (the "Marketing Rights").

          2.2  Exercise of Option; Royalties.  Genzyme may exercise the Option
     at any time prior to the date that is six months after the filing of an NDA
     for a Product for any indication (the "Option 
<PAGE>
 
     Expiration Date") by (i) giving Aronex written notice of its exercise of
     the Option and (ii) paying Aronex Three Million Dollars ($3,000,000.00). If
     Genzyme exercises the Option, Genzyme shall pay Aronex a royalty equal to
     [*] of Net Sales by Genzyme, its Affiliates and its sublicensees throughout
     the world. If Genzyme does not exercise the Option within six months after
     the filing of an NDA for the Product for any indication, the Option shall
     expire and may not thereafter be exercised with respect to the Product for
     which the NDA is filed or any subsequent Product or indication.

          2.3 Aronex Right to Re-Acquire Marketing Rights. Notwithstanding the
     foregoing, Aronex shall have the right, exercisable at any time before the
     end of the twelve-month period following the filing of an NDA, to re-
     acquire the Marketing Rights and to terminate Genzyme's rights thereunder
     by (i) giving Genzyme written notice of its exercise of such right, (ii)
     paying Genzyme Two Million Dollars ($2,000,000.00) and (iii), if such right
     is exercised after Genzyme's exercise of the Option, additionally returning
     to Genzyme the Three Million Dollars ($3,000,000.00) received from Genzyme
     in connection with Genzyme's exercise of the Option. If Aronex terminates
     Genzyme's rights to use, market, import, export and sell Products pursuant
     to this Section 2.3, Aronex shall pay Genzyme a royalty equal to (i) [*] of
     Net Sales by Aronex and its Affiliates throughout the world and (ii) [*] of
     Sublicensee Royalties received by Aronex and its Affiliates; provided that
     Aronex shall pay a minimum of $500,000 of royalties within the first twelve
     months following the due date of the $2,000,000 payment provided for above
     (which amount shall be credited against the percentage royalties
     contemplated hereby). Aronex's obligation to pay such royalties shall
     terminate once Aronex has paid a total of Thirteen Million Dollars
     ($13,000,000.00) in royalties.

          2.4 Failure to Exercise or Termination by Genzyme. If Genzyme does not
     exercise the Option, or if Genzyme terminates the Option prior to the
     Option Expiration Date as provided below, Aronex shall pay Genzyme Two
     Million Dollars ($2,000,000.00) within thirty (30) days after the Option
     Expiration Date or such earlier termination. In addition, Aronex shall pay
     Genzyme a royalty equal to (i) [*] of Net Sales by Aronex and its
     Affiliates throughout the world and (ii) [*] of Sublicensee Royalties
     received by Aronex and its Affiliates; provided that Aronex shall pay a
     minimum of $500,000 of royalties within the first twelve months following
     the due date of the $2,000,000 payment provided for above (which amount
     shall be credited against the percentage royalties contemplated hereby).
     Aronex's obligations to pay such royalties shall terminate once Aronex has
     paid a total of Eight Million Dollars ($8,000,000.00) in royalties. Genzyme
     may terminate the Option and relinquish its rights thereunder at any time
     prior to the Option Expiration Date, but no earlier than the earlier of (i)
     March 24, 1999 and (ii), if applicable, Aronex's termination of all
     clinical development of AR-623, by giving Aronex written notice of such
     termination.

          2.5  Reports and Payments.  Any party obligated to pay royalties
     hereunder (the "Paying Party") shall keep, and shall require all Affiliates
     and sublicensees to keep, for a period of three years after a payment is
     due, accurate records in sufficient detail to enable the amounts due
     hereunder to be determined.  Within sixty (60) days after the end of each
     calendar quarter, the Paying Party shall deliver to the other party a
     written accounting, including quantities and monetary amounts of sales of
     each Product by the Paying Party and its Affiliates and any sublicensees,
     on a country-by-country basis, and the amount of royalty payments, if any,
     due for such quarter.  The Paying Party, upon delivery of such accounting,
     shall pay all royalties shown to be due thereunder.


* Confidential treatment requested

                                      -2-
<PAGE>
 
          2.6  Audit Rights.  A Paying Party shall permit the other party or its
     representatives to have access to the Paying Party's books and records for
     the sole purpose of verifying the royalties payable hereunder.  Such review
     may be conducted no more than once during each year royalties are due
     hereunder and twice during the three years following termination of this
     Agreement.  The review shall be conducted after reasonable notice and
     during reasonable business hours.  If such review reveals that royalties
     have been understated for any calendar year, such underpayment shall be
     immediately paid by the Paying Party; provided that if such examination was
     not conducted by an independent accountant, the Paying Party shall have the
     right to engage an independent accountant reasonably acceptable to the
     other party to verify the results of such review.  The fees and expenses of
     such accountant shall be paid by the party alleging an error unless the
     error is more than ten percent (10%) of the actual amount due, in which
     case the party who made the error shall pay all reasonable costs and
     expenses incurred by the investigating party in the course of making such
     determination.  Any sublicense granted by either party shall contain audit
     provisions as set forth in this subsection 2.6.

          2.7  Payment Currency.  All payments to be made under this Agreement
     shall be made in United States dollars.  In the case of sales in foreign
     currencies, the rate of exchange to be used in computing the amount of
     currency equivalent in United States dollars due hereunder shall be made at
     the rate of exchange prevailing on the last day of the calendar quarter
     published by the money center bank designated by the Paying Party which it
     uses for currency conversion in the preparation of its public financial
     reports.

          2.8  Payment Mechanics.  All payments under this Agreement shall be
     made by wire transfer of immediately available funds to such account as the
     receiving party shall specify or by other payment method acceptable to the
     parties.  If royalties are due for Net Sales in a country where, for
     reasons of currency, tax or other regulations, transfer of foreign currency
     out of such country is prohibited, the Paying Party may pay such royalties
     by placing them in a bank account in such country in the name of and under
     the sole control of the receiving party; provided, however, that the bank
     selected be reasonably acceptable to the receiving party and that the
     Paying Party inform the receiving party of the location, account number,
     amount and currency of money deposited therein.

          2.9  Acquisition of Third Party Rights.  Aronex shall use all
     commercially reasonable efforts to obtain any rights from any Third Party
     that are necessary for the manufacture, use or sale of the Product in
     accordance with this Agreement and upon such acquisition by Aronex, such
     rights shall be automatically included in the Option granted in Section 2.1
     without any further action of the parties.  The costs of obtaining such
     rights shall be borne as follows:

          (a) Aronex Costs.  Aronex shall bear all costs associated with (i)
     Third Party rights necessary for the manufacture or sale of both the
     Product and other products under development or being sold by Aronex or its
     Affiliates or sublicensees and (ii) Third Party rights with respect to
     Product sales by Aronex or its Affiliates or sublicensees (other than
     Genzyme).

          (b) Genzyme Costs.  Genzyme shall bear all costs associated with Third
     Party rights with respect to Product sales by Genzyme or its Affiliates or
     sublicensees.

                                      -3-
<PAGE>

          (c) Shared Costs.  In the event Aronex and Genzyme co-promote sales of
     the Product in the United States, Aronex and Genzyme shall share costs
     associated with third party rights in proportion to their relative shares
     of Net Profit.

     2.   DEVELOPMENT PROGRAM.  Aronex and Genzyme agree that the research and
development being conducted by Genzyme in accordance with the current Work Plan
shall be terminated as promptly as practicable, and that Genzyme shall have no
obligation to perform any further research or development under the Development
Agreement.  Notwithstanding the foregoing, Genzyme shall provide Aronex with an
NDA quality report with accompanying table summaries and case reports of the
phase II/III Kaposi's sarcoma clinical trial no later than August 1, 1997.
Aronex presently intends to continue certain research and development work for
AR-623, and to file an NDA and a PLA for the use of AR-623 for treatment of APL,
but shall have the right to discontinue all such research and development, in
its sole discretion, for any reason.  Except as expressly set forth in this
Amendment, Article 3 of the Development Agreement is hereby amended and restated
to read in its entirety as follows:

          3.1  Project Representatives.  The parties have each designated a
     Project Representative to facilitate as a liaison between it and the other
     party, and to oversee and review the progress of the Development Program
     and other relevant matters under this Agreement.

          3.2  Progress Reports.  Within 45 days following the end of each
     calendar year, the Aronex Project Representative shall deliver to the
     Genzyme Project Representative a reasonably detailed written report which
     shall describe the progress of the Development Program performed by it
     during the year.

          3.3  Records and Data.  Each party shall maintain records in
     sufficient detail and in good scientific manner appropriate for patent and
     FDA purposes and so as to properly reflect all work done and results
     achieved in the performance of the Development Program.  Such records shall
     include books, records, reports, research notes, charts, graphs, comments,
     computations, analyses, recordings, photographs, computer programs and
     documentation thereof, computer information storage means, samples of
     materials and other graphic or written data generated in connection with
     the Development Program, including any data required to be maintained
     pursuant to applicable governmental regulations.  Each party shall provide
     the other the right to inspect records, and shall provide copies of all
     requested records, to the extent, reasonably related to the performance of
     the other's obligations under this Agreement.

     3.   ALLOCATION OF COSTS; TERMINATION OF MILESTONE AND OTHER PAYMENTS.  All
expenses incurred by either party pursuant to the Development Agreement through
the Effective Date shall be determined within thirty (30) days of the Effective
Date and responsibility for such costs and any resulting reimbursements shall be
made according to the terms of the Development Agreement as in effect prior to
this Amendment.  Except for the foregoing allocation of costs, the Development
Agreement is hereby amended by deleting Article 4 thereof in its entirety.

                                      -4-
<PAGE>
 
     4.   COMMERCIALIZATION RIGHTS.  Article 5 of the Development Agreement is
hereby amended and restated to read in its entirety as follows:

          5.  COMMERCIALIZATION.  In the event the Option is exercised:

          5.1.  Manufacturing.  Aronex shall be responsible for manufacturing or
     subcontracting the manufacture of all of Genzyme's requirements for
     Product, subject to customary forecast and order procedures.  If Aronex or
     its subcontractor is manufacturing, Aronex's (or its subcontractor's)
     responsibilities shall include all aspects of the manufacturing process,
     including maintenance of manufacturing inventory, quality control and
     shipment of Product in accordance with orders placed by Genzyme.  As
     compensation for such manufacturing services, Aronex shall be entitled to
     receive payment of its fully burdened COGS.

          5.2  Sales.  Following regulatory approval in any country, Genzyme
     shall use commercially reasonable efforts to market and sell the Product in
     such country.  All terms of sale, including pricing policies, credit terms,
     cash discounts and returns and allowances, as well as the nature of
     marketing efforts, shall be set by Genzyme.  Genzyme shall be responsible
     for invoicing the customers for Product and collecting payment therefor.
     The Product shall be sold under the trademark "Atragen" (for which purpose
     Genzyme shall have a royalty-free license to use such trademark) or such
     other trademark as the parties may agree.

          5.3  Co-Promotion.  Aronex and Genzyme shall co-promote the Product in
     the United States, subject to the following principles of agreement and
     such other terms and conditions as the parties may agree upon at that time:

          (a) Sales and Marketing.  The parties shall select one party by
     agreement which shall retain management responsibility for sales and
     marketing of the Product (the "Marketing Manager"). All marketing decisions
     will be made by the Marketing Manager, including but not limited to pricing
     and other terms of sale, distribution channels, sales personnel,
     advertising, promotion and marketing programs.  All customer orders will be
     received, executed and invoiced by the Marketing Manager. If the other
     party receives any orders, it will refer the customer to the Marketing
     Manager or appropriate drug wholesalers as designated by the Marketing
     Manager.  The parties shall agree upon the responsibilities and scope of
     the party that is not selected to be the Marketing Manager, with the
     expectation that such other party shall substantively participate in the
     marketing and "technical detailing" of the Product.

          (b) Profit Sharing.  Aronex and Genzyme will each be entitled to [*]
     of Net Profit on sales by the Marketing Manager and its Affiliates of
     Products in the United States in any calendar year.  All royalties with
     respect to such sales shall be deducted from Net Sales before the foregoing
     allocation of Net Profit is made.

          (c) Trademark.  The Product shall be sold under the trademark
     "Atragen/(TM)/" or such other a trademark as the parties may agree.

          (d) Co-Promotion Rights Not Assignable.  Neither party's co-promotion
     rights under this Section 5.3 may be assigned or transferred to any Third
     Party, including an assignment as a result of a merger or consolidation of
     such party, without the prior written consent of the other party, which
     shall not be unreasonably withheld or delayed.


* Confidential treatment requested
                                      -5-
<PAGE>
 
     5.   TERM OF DEVELOPMENT AGREEMENT.  Section 10.1 of the Development
Agreement is hereby amended and restated to read in its entirety as follows:

          10.1  Term of Agreement.  This Agreement and any License granted
     hereunder shall remain in effect on a country-by-country basis until the
     later of (i) the expiration of the last-to-expire Patent relating to any
     Product in such country or (ii) the date that is 10 years after the First
     Commercial Sale in such country.  If Genzyme has exercised the Option (and
     Aronex has not reacquired the Marketing Rights), Genzyme shall thereafter
     have a fully paid-up license to use the Patents and the Subject Technology
     in such country.

Article 10 of the Development Agreement is further amended by deleting Section
10.3 thereof in its entirety.

     6.   DEFINITIONS.  Article 1 of the Development Agreement is hereby amended
by replacing Sections 1.19 and 1.20 in their entirety and adding new 
Section 1.30, as follows:

          1.19  "Net Profit" means the difference between (a) Net Sales and (b)
     the sum of (i) Cost of Goods Sold and (ii) 30% of Net Sales (for the
     Marketing Manager's and its Affiliates' sales and marketing expense
     relating to the Product regardless of the actual expenses incurred).

          1.20  "Net Sales" means the gross amount billed for Product sold
     pursuant to this Agreement to a Third Party, less discounts, rebates,
     returns, credits, contractual allowances, sales deemed uncollectible,
     shipping and insurance charges, sales taxes, duties, other governmental
     charges measured by the amount billed and any royalties payable to Third
     Parties; provided that, for purposes of the royalties payable under
     Sections 2.3 or 2.4, Net Sales shall not include sales by sublicensees, if
     any, of Aronex and its Affiliates.

          In the event a Product is sold in a combination product with other
     pharmacologically active components, Net Sales, for purposes of royalty
     payments on the combination product, shall be calculated by multiplying the
     Net Sales of that combination product by the fraction A/B, where A is the
     gross selling price of the Product sold separately and B is the gross
     selling price of the combination product.  In the event that no such
     separate sales are made by Aronex or Genzyme or their respective Affiliates
     or sublicensees, the parties shall negotiate in good faith the meaning of
     Net Sales for purposes of royalty payments on the combination product.

          1.30  "Sublicensee Royalties" means all royalties paid to Aronex and
     its Affiliates by sublicensees, if any, of Aronex and its Affiliates with
     respect to such sublicensees' rights to and sales of the Product.

     7.   ADDITIONAL AMENDMENTS.  Article 11 of the Development Agreement is
hereby terminated and shall be of no further force and effect.

     8. "ATRAGEN/(TM)/" TRADEMARK. Genzyme hereby assigns and transfers to
Aronex, all right, title and interest it may have in the trade name "Atragen"
and the associated trademark and all related goodwill.

     9.   NO OTHER AMENDMENTS.  Except as specifically amended hereby, the
Development Agreement shall continue in full force and effect.

                                      -6-
<PAGE>
 
     IN WITNESS WHEREOF the parties hereto have executed this Amendment in one
or more copies effective as of the Effective Date.

                                       ARONEX PHARMACEUTICALS, INC.


                                       By: /s/ James M. Chubb
                                           ------------------------------------
                                           James M. Chubb, Ph.D., President


                                       GENZYME CORPORATION


                                       By: /s/ Richard Douglas
                                           ------------------------------------
                                           Richard Douglas
                                           Vice President-Corporate Development

                                      -7-

<PAGE>
 
                                                                    EXHIBIT 10.2


                                AMENDMENT NO. 3
                                      TO
                        COMMON STOCK PURCHASE AGREEMENT

     This Amendment No. 3 to Common Stock Purchase Agreement  (this "Amendment")
is made as of the 25th day of March, 1997 (the "Effective Date") by and between
Aronex Pharmaceuticals, Inc., a Delaware corporation ("Aronex"), and Genzyme
Corporation, a Massachusetts corporation ("Genzyme"). Capitalized terms used
without definition in this Amendment shall have the meanings given to such terms
in the Purchase Agreement (as defined below).

                                    RECITALS

     WHEREAS, Aronex (f/k/a Argus Pharmaceuticals, Inc.) and Genzyme entered
into a Common Stock Purchase Agreement dated September 10, 1993 (as subsequently
amended by amendments dated September 8, 1995 and September 10, 1996, the
"Purchase Agreement") relating to the purchase by Genzyme of shares of the
common stock of Aronex, including the purchase by Genzyme of Additional Shares
upon the acceptance by the FDA of a protocol for a pivotal trial of AR-623 for a
non-hematologic cancer indication; and

     WHEREAS, pursuant to the amendment to the Purchase Agreement dated
September 10, 1996, Genzyme made an advance payment of $2,000,000 toward the
purchase price for a portion of the Additional Shares; and

     WHEREAS, Aronex agreed to repay such advance payment upon a decision by the
parties not to file a protocol for a pivotal trial of AR-623 for a non-
hematologic cancer indication (as evidenced by a Promissory Note dated 
September 13, 1996); and

     WHEREAS, in connection with amendment No. 3 to the License and Development
Agreement between the parties, Aronex and Genzyme desire to further amend the
Purchase Agreement (i) to release Genzyme from any obligation to purchase
Additional Shares and (ii) to cancel the Promissory Note and Aronex's repayment
obligations thereunder and convert the advance payment made by Genzyme to a
payment for research and development work performed by Aronex.

     NOW, THEREFORE, in consideration of the foregoing and the mutual covenants
contained herein, Aronex and Genzyme agree as follows:

     1.   CANCELLATION OF PROMISSORY NOTE AND RELATED OBLIGATIONS OF ARONEX.
The Promissory Note issued by Aronex to Genzyme pursuant to Section 1.3 of the
Purchase Agreement, and all obligations of Aronex thereunder, is hereby
terminated and shall be of no further force and effect. The advance payment
contemplated by Section 1.3 and evidenced by the Promissory Note shall be deemed
to have been converted to a payment for research and development work performed
by Aronex under the License and Development Agreement.  Genzyme shall return the
original promissory note to Aronex marked cancelled.  In furtherance of the
foregoing, the Purchase Agreement is hereby amended by deleting Section 1.3
thereof in its entirety.
<PAGE>
 
     2.   CANCELLATION OF OBLIGATIONS OF GENZYME AND ARONEX WITH RESPECT TO
          ADDITIONAL SHARES. 

The obligations of Genzyme to purchase Additional Shares from Aronex, and of
Aronex to issue and deliver Additional Shares to Genzyme, pursuant to Section
1.4 of the Agreement are hereby terminated and shall be of no further force and
effect. The Purchase Agreement is hereby amended by deleting Section 1.4 thereof
in its entirety.

     3.   NO OTHER AMENDMENTS.  Except as specifically amended hereby, the
Purchase Agreement shall continue in full force and effect.

     IN WITNESS WHEREOF the parties hereto have executed this Amendment in one
or more copies effective as of the Effective Date.

                              ARONEX PHARMACEUTICALS, INC.


                              By: /s/ James M. Chubb, Ph.D
                                  --------------------------------
                                  James M. Chubb, Ph.D., President


                              GENZYME CORPORATION


                              By: /s/ Richard Douglas
                                  --------------------------------
                                  Richard Douglas
                                  Vice President-Corporate Development



                                      -2-

<PAGE>
 
                                                                    EXHIBIT 10.3


December 5, 1996



Praveen Tyle, Ph.D.
14850 Gable Ridge Road
San Diego, CA  92128

Dear Praveen:

I am pleased to present for your consideration the following proposal to join
Aronex as Vice President, Pharmaceutical Development and Operations.  In this
position you will report directly to me.  Your responsibilities will include
directing Pharmaceutical Development, Chemistry, Quality Control, and
Manufacturing.  In addition, one individual for Document Control from Regulatory
Affairs will report to you.  You will be responsible for planning, budgeting and
developing the Company's Pharmaceutical Development and Operations activity, and
assure the Company's products are manufactured under G.M.P.  You will be a
member of the Company's Executive Committee.  A starting date of February 3,
1997 is anticipated, although I would prefer an earlier start date, if possible.

Compensation for the position would include the following:

     Base salary:     $168,000 annually

     Stock Grant:     Total 5,000 shares

     Stock Option:    100,000 options at fair market value, 30,000 to vest upon
                      joining Aronex. The balance will vest over four years at a
                      rate of 1/48 per month. Additional options will be granted
                      on a yearly basis dependent upon Board approval.

     Bonus:           A target annual bonus of 20% of base salary in cash, stock
                      grants, and/or stock options, dependent upon you meeting
                      Company goals and Board approval.

     Performance
     Evaluation:      July Performance evaluation with full consideration.

     Benefits:        Benefits would include medical, dental, and disability,
                      401K plan, stock purchase plan, medical benefits,
                      cafeteria plan, three weeks annual vacation, and all other
                      Company benefits defined in the Company's Benefits
                      Summary.

     Relocation:      Up to two trips to Houston for you and your wife to select
                      new housing. Moving costs of personal property. Costs
                      related to real estate commission and closing costs of
                      your current home, and closing costs associated with
                      purchase of a new home (including up to one percent loan
                      origination and two mortgage points). Up to six months of
                      temporary housing or the mortgage payments on your San
                      Diego house if it has not been sold by the time you have
                      moved and taken up residence in Houston. The goal is for
                      you to have to pay housing costs at only one location. The
                      Company will cover a loss on the sale of your current home
                      up to a maximum of $15,000, based on the difference
                      between your cost basis for your San Diego home of
                      $215,800 and the final sales price. The Company will also
                      cover gross-up costs related to your relocation expenses,
                      but not for the stock grants.
<PAGE>
 
Praveen Tyle, Ph.D.
December 5, 1996
Page 2



     Employment
     Agreement:       A one year severance package of base salary and benefits
                      if terminated by the Company for reasons other than cause.

I believe this  package is very reasonable and reflects the importance of the
position and the value we perceive you will bring to Aronex.

I hope you find this proposal acceptable.  I look forward to you joining Aronex
as early as possible

Best regards,

/s/ James M. Chubb

James M. Chubb, Ph.D.
President

JMC/cc

Enclosure


Accepted and Agreed upon this 18th day of December, 1996.



                                    /s/ Praveen Tyle, Ph.D.
                                    -----------------------
                                    Praveen Tyle, Ph.D.

<PAGE>
 
                                                                    EXHIBIT 10.4


March 12, 1997


FAX #:  609/683-8916

David S. Gordon, M.D.
22 Florence Lane
Princeton, NJ  08540

Dear David:

I am extremely pleased that you have agreed to join Aronex.  The Company is at a
very exciting period in its evolution and your involvement will surely add
significant value.

As agreed, I am pleased to offer you the position of Senior Vice President of
Medical Affairs and Chief Medical Officer. In this position, you will report
directly to me.  Your primary responsibility will be to develop and validate the
Company's clinical Development strategy, as well as assure that the strategic
plans and time lines are effectively executed.  You will be responsible for
assuring the clinical data are published in a timely manner and you will be
responsible for securing expert clinical advocates for the company's products.
You will also assist in identifying and will be responsible for evaluating and
recommending a clinical course of action for potential development candidates.
You will be the chief medical spokesman for the Company and be responsible for
presenting the Company's clinical strategy and direction to the pharmaceutical,
financial and regulatory communities.  The Company, its Board of Directors, and
its consultants will provide total support to you in fulfilling this role.  You
will be responsible for the departments and personnel in Regulatory, Clinical
Research, and Statistical Services/Data Management.  The organization and
necessary hiring to build a cohesive, competent team with capabilities of
progressing at least three products through clinical development simultaneously
will be your responsibility.

You will be an officer of the Company and a member of the Company's Executive
Committee consisting of the following department heads:  Preclinical Research,
Pharmaceutical Development, Clinical Research, Regulatory, Finance and Business
Development.  This Committee is responsible for developing the Company's short
and long term strategy, and defining the Company's budget.  An official starting
date of March 24 is acceptable.  However, since you will be out of the country
through the first three weeks of April, payment of your salary and benefits will
not commence until April 28, 1997.

Compensation for this position includes the following:

     Base Salary:  $213,000 annually.  Annual salary adjustments as determined
                   by the Compensation Committee based upon performance.

     Stock
     Options:      One hundred twenty-five (125,000) options at fair market
                   value. Twenty-five thousand (25,000) will vest upon joining
                   Aronex on April 28, 1997. The balance will vest over four
                   years at a rate of 1/48 per month. You will have a two year
                   period from the time you leave the Company to exercise vested
                   options.

     Bonus:        A target annual bonus of up to 20% set by the Compensation
                   Committee of the Board of Directors will be paid annually.
                   The bonus will be paid as a percentage of salary in cash,
                   stock grants/or stock options, dependent upon meeting Company
                   and department goals.

     Benefits:     Benefits include medical, dental, disability, 401K Plan,
                   Stock Purchase Plan, Medical Benefits Cafeteria Plan, term
                   life insurance equal to one times your annual salary, three
                   weeks vacation, and all the other Company benefits defined in
                   the Company's Benefit Manual. These documents have been sent
                   under separate cover.
<PAGE>
 
David S. Gordon, M.D.
March 12, 1997
Page 2


                   In addition, the Company will provide a full membership to
                   The Woodlands Country Club. You will be personally
                   responsible for the monthly Country Club fees and any charges
                   you incur.

     Relocation:   Up to a maximum of $1,750/month for 12 months from the date
                   of joining Aronex to cover rental cost for housing in Houston
                   or for mortgage payments on a house purchased in Houston.
                   Costs related to real estate commissions and closing costs of
                   your current house, closing costs on your new home, and
                   moving costs of personal property, including up to two
                   automobiles will be covered. Personal property may be moved
                   in partial shipments, if necessary, to furnish your Houston
                   home or provide transportation.

                   We recognize the issues you have concerning the relocation to
                   Houston. To ameliorate those issues to a major extent, we are
                   willing to pay, as indicated, above $1,750/month of your
                   rental or mortgage costs for the first 12 months after you
                   join Aronex. We would hope that within one year, you would
                   make Houston your primary residence. If circumstances are
                   such that this cannot be done in one year, Company bonuses
                   and annual increases should attenuate the housing expense
                   post 12 months. We are also willing for you to manage your
                   time so that you can be in New Jersey to conduct business as
                   is appropriate. At the same time, we expect you to devote
                   whatever time is required in Houston to manage the Clinical
                   Affairs program, provide strategic direction and represent
                   the Company as needed. The need to balance your requirements
                   with Aronex and your personal obligations will, undoubtedly,
                   be a challenge. I believe we should strive for this balance
                   to appear seamless by the Company and the team that will be
                   reporting to you.

                   We are also prepared for your continued Board involvement on
                   the Hycor Board and, if appropriate, joining one other Board.
                   We also would encourage you to obtain a clinical appointment
                   at M.D. Anderson Cancer Center. We believe the interaction
                   you will have in such an association will be valuable to
                   Aronex.

     Employment
     Agreement:    A one year severance package of base salary and benefits if
                   you are terminated not for cause.

We are delighted you will be joining us and look forward to an exciting and
rewarding venture.  For our administrative records, please sign and return the
attached copy by mail marked "Confidential."

Best regards,

/s/  James M. Chubb

James M. Chubb, Ph.D.
President

JMC/cc

Accepted and agreed upon this 28th day of March, 1997.



                                    /s/ David S. Gordon, M.D.
                                    -------------------------
                                    David S. Gordon, M.D.

<PAGE>
 
                                                                    EXHIBIT 11.1

                         ARONEX PHARMACEUTICALS, INC.
                                 EXHIBIT 11.1


             STATEMENT REGARDING COMPUTATION OF PER SHARE EARNINGS
 
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.

<TABLE> 
<CAPTION> 
 
                                                                                 AVERAGE                  LOSS    
                                                 DAYS                            SHARES                    PER    
                                 SHARES      OUTSTANDING    SHARES X  DAYS      OUTSTANDING     LOSS      SHARE   
<S>                             <C>         <C>            <C>                 <C>             <C>       <C>      
QUARTER ENDED MARCH 31, 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            20,837,351                                        
                               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            21,357,121                                        
                               10,680,653          1            10,680,653                                        
                               10,680,903          3            32,042,709                                        
                               10,710,132          4            42,840,526                                        
                               10,718,504          6            64,311,024                                        
                               10,727,170          4            42,908,678                                        
                               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            43,107,962                                        
                               10,784,842          1            10,784,842                                        
                               10,812,921          1            10,812,921      
                               10,832,546          2            21,665,092      
                               10,847,725          2            21,695,449      
                                                  91           968,932,732  /91 10,647,612   (2,073,000)  (0.19) 
 
QUARTER ENDED MARCH 31, 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           5           73,224,080               
                                                   90        1,315,794,340  /90 14,619,937   (3,093,000)  (0.21)
</TABLE>
 
 

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
ART.5 FDS FOR 1ST QUARTER 10-Q
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 THREE MONTHS ENDED MARCH 31, 1997 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                       3,074,000
<SECURITIES>                                35,333,000
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                            31,365,000
<PP&E>                                       5,114,000
<DEPRECIATION>                               3,128,000
<TOTAL-ASSETS>                              41,616,000
<CURRENT-LIABILITIES>                        3,907,000
<BONDS>                                              0
                           15,000
                                          0
<COMMON>                                             0
<OTHER-SE>                                  37,611,000
<TOTAL-LIABILITY-AND-EQUITY>                41,616,000
<SALES>                                              0
<TOTAL-REVENUES>                               878,000
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              30,000
<INCOME-PRETAX>                            (3,093,000)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (3,093,000)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (3,093,000)
<EPS-PRIMARY>                                    (.21)
<EPS-DILUTED>                                    (.21)
        

</TABLE>


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