ARONEX PHARMACEUTICALS INC
10-Q, 1999-11-15
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1

================================================================================

                       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 [NO FEE REQUIRED]

                For the Quarterly Period Ended September 30, 1999

                                       OR

    ( )  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934 [NO FEE REQUIRED]

              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)

     8707 Technology Forest Place, The Woodlands, Texas        77381-1191
        (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 SEPTEMBER 30, 1999
       -----------------------------     ---------------------------------
       Common Stock, $.001 par value              22,788,071 shares


================================================================================


<PAGE>   2


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                       QUARTERLY PERIOD SEPTEMBER 30, 1999

                                      INDEX

<TABLE>
<CAPTION>
                                                                                                PAGE
                                                                                                ----
<S>      <C>                                                                                    <C>
Factors Affecting Forward-Looking Statements...................................................   3

PART I.           FINANCIAL INFORMATION

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

         Consolidated Balance Sheets - December 31, 1998 and September 30, 1999 (unaudited)....   4

         Consolidated Statements of Operations:
           Nine Months Ended September 30, 1998 and September 30, 1999
           (unaudited) and three months ended September 30, 1998 and September
           30, 1999 (unaudited) and for the Period from Inception
           (June 13, 1986) through September 30, 1999 (unaudited)..............................   5

         Consolidated Statements of Comprehensive Income:
           Nine Months Ended September 30, 1998 and September 30, 1999
           (unaudited) and three months ended September 30, 1998 and
           September 30, 1999 (unaudited)......................................................   5

         Consolidated Statements of Cash Flows:
           Nine Months Ended September 30, 1998 and September 30, 1999
           (unaudited) and for the Period from Inception (June 13, 1986)
           through September 30, 1999 (unaudited)..............................................   6

         Notes to Consolidated Financial Statements -September 30, 1999........................   7

Item 2   Management's Discussion and Analysis of Financial
           Condition and Results of Operations.................................................  10

Item 3   Quantitative and Qualitative Disclosures about Market Risk............................  15

PART II.           OTHER INFORMATION

Item 6   Exhibits and Reports on Form 8-K......................................................  16


SIGNATURES ....................................................................................  17
</TABLE>


                                       -2-

<PAGE>   3
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
"Exchange Act"). 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 and
Proprietary Rights," "-- Government Regulation," "-- Competition" and "--
Additional Business Risks" included in the Company's Annual Report on Form 10-K
for the year ended December 31, 1998, (the "1998 Form 10-K") 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.       CONSOLIDATED FINANCIAL STATEMENTS

         The following unaudited consolidated 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 consolidated
financial statements should be read in conjunction with the audited financial
statements for the year ended December 31, 1998 included in the 1998 Form 10-K.

         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>   4


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)


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


                                     ASSETS

<TABLE>
<CAPTION>
                                                                                                         SEPTEMBER 30,
                                                                                      DECEMBER 31,            1999
                                                                                         1998             (UNAUDITED)
                                                                                    ---------------      -------------
<S>                                                                                 <C>                  <C>
Current assets:
   Cash and cash equivalents.................................................       $        11,338      $      15,884
   Short-term investments....................................................                 7,757              7,515
   Accounts receivable.......................................................                   132                857
   Prepaid expenses and other assets.........................................                   260                567
                                                                                    ---------------      -------------
        Total current assets.................................................                19,487             24,823

Long-term investments........................................................                 1,295                927
Furniture, equipment and leasehold improvements, net of accumulated
   depreciation of $2,839 and  $3,319, respectively..........................                 2,263              2,126
                                                                                    ---------------      -------------
        Total assets.........................................................       $        23,045      $      27,876
                                                                                    ===============      =============

                                 LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
   Accounts payable and accrued expenses.....................................       $         5,319      $       3,207
   Accrued payroll...........................................................                   885                830
   Advance from Genzyme......................................................                 2,000                 --
   Current portion of notes payable and obligations under capital leases.....                   219                317
                                                                                    ---------------      -------------
        Total current liabilities............................................                 8,423              4,354

Long-term liabilities:
   Notes payable.............................................................                 1,012              3,618
                                                                                    ---------------      -------------
        Total long-term liabilities..........................................                 1,012              7,972

Commitments and contingencies

Stockholders' equity:
   Preferred stock $.001 par value, 5,000,000 shares authorized,
        none issued and outstanding..........................................                    --                 --
   Common stock $.001 par value, 40,000,000 shares authorized,
        16,379,309 and 22,788,071 shares issued and outstanding,
        respectively.........................................................                    16                 23
   Additional paid-in capital................................................               100,654            112,983
   Common stock warrants.....................................................                    50                959
   Treasury stock............................................................                   (11)               (11)
   Deferred compensation.....................................................                  (380)              (127)
   Unrealized gain on investments............................................                   716                817
   Deficit accumulated during development stage..............................               (87,435)           (94,740)
                                                                                    ---------------      -------------
        Total stockholders' equity...........................................                13,610             19,904
                                                                                    ---------------      -------------
        Total liabilities and stockholders' equity...........................       $        23,045      $      27,876
                                                                                    ===============      =============
</TABLE>


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

                                       -4-

<PAGE>   5


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)


                      CONSOLIDATED STATEMENTS OF OPERATIONS
             (ALL AMOUNTS IN THOUSANDS, EXCEPT LOSS PER SHARE DATA)
                                   (UNAUDITED)



<TABLE>
<CAPTION>
                                                                                                                       PERIOD
                                                                                                                        FROM
                                                                                                                      INCEPTION
                                                             NINE MONTHS ENDED            THREE MONTHS ENDED          (JUNE 13,
                                                                SEPTEMBER 30,                 SEPTEMBER 30,             1986)
                                                          ------------------------      ------------------------       THROUGH
                                                                                                                      SEPT. 30,
                                                             1998           1999           1998           1999           1999
                                                          ---------      ---------      ---------      ---------      ---------
<S>                                                       <C>            <C>            <C>            <C>            <C>
Revenues:
     Interest income ...................................  $   1,013      $   1,030      $     265      $     339      $   7,876
     Research and development grants and contracts .....        329         10,727            136            854         22,514
                                                          ---------      ---------      ---------      ---------      ---------
              Total revenues ...........................      1,342         11,757            401          1,193         30,390

Expenses:
     Research and development ..........................     15,399         15,664          5,532          5,035         91,592
     Purchase of in-process research and development ...         --             --             --             --         11,625
     Selling, general and administrative ...............      2,448          3,141            901          1,414         20,299
     Interest expense and other ........................         41            257             27            143          1,614
                                                          ---------      ---------      ---------      ---------      ---------
              Total expenses ...........................     17,888         19,062          6,460          6,592        125,130
                                                          ---------      ---------      ---------      ---------      ---------

Net loss ...............................................  $ (16,546)     $  (7,305)     $  (6,059)     $  (5,399)     $ (94,740)
                                                          =========      =========      =========      =========      =========

Basic and diluted loss per share .......................  $   (1.07)     $   (0.34)     $   (0.39)     $   (0.24)
                                                          =========      =========      =========      =========

Weighted average shares used in computing basic and
diluted loss per share .................................     15,475         21,365         15,497         22,664
</TABLE>


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)


                 CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
             (ALL AMOUNTS IN THOUSANDS, EXCEPT LOSS PER SHARE DATA)
                                   (UNAUDITED)



<TABLE>
<S>                                                           <C>             <C>            <C>           <C>
Comprehensive income:
 Net loss................................................     $  (16,546)     $   (7,305)    $  (6,059)    $  (5,399)
     Unrealized gain on securities available for sale....             --             101            --            --
                                                              ----------      ----------     ---------     ---------
              Comprehensive income.......................     $  (16,546)     $   (7,204)    $  (6,059)    $  (5,399)
                                                              ==========      ==========     =========     =========
</TABLE>

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

                                       -5-

<PAGE>   6


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)


                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                           (ALL AMOUNTS IN THOUSANDS)
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                                              PERIOD FROM
                                                                                                               INCEPTION
                                                                                                               (JUNE 13,
                                                                                     NINE MONTHS ENDED           1986)
                                                                                       SEPTEMBER 30,            THROUGH
                                                                                 ------------------------    SEPTEMBER 30,
                                                                                   1998           1999           1999
                                                                                 ---------      ---------      ---------
<S>                                                                              <C>            <C>            <C>
Cash flows from operating activities:
   Net loss ................................................................     $ (16,546)     $  (7,305)     $ (94,740)
   Adjustments to reconcile net loss to net cash provided by
     (used in) operating activities:
        Depreciation and amortization ......................................           521            480          5,327
        Loss (gain) disposal of assets .....................................            (2)            --            200
        Compensation expense related to stock, stock options and stock
          warrants .........................................................           432            861          4,644
        Charge for purchase of in-process research and development .........            --             --         11,547
        Acquisition costs, net of cash received ............................            --             --           (270)
        Accrued interest payable converted to stock ........................            --             --             97
        Loss in affiliate ..................................................            --             --            500
   Changes in assets and liabilities:
        Decrease (increase) in accounts receivable .........................           100           (725)          (857)
        Decrease (increase) in prepaid expenses and other assets ...........            90           (307)          (382)
        Increase (decrease) in accounts payable and accrued expenses .......         1,361         (2,167)         3,964
        Decrease in deferred revenue .......................................            --             --           (353)
                                                                                 ---------      ---------      ---------
                  Net cash used in operating activities ....................       (14,044)        (9,163)       (70,323)

Cash flows from investing activities:
   Purchases of investments ................................................       (37,518)       (11,353)      (260,887)
   Sales of investments ....................................................        53,240         12,064        258,997
   Purchase of furniture, equipment and leasehold improvements .............        (1,545)          (343)        (6,422)
   Proceeds from sale of assets ............................................             9             --             63
   Deposits ................................................................           490             --             --
   Investment in affiliate .................................................            --             --           (500)
                                                                                 ---------      ---------      ---------
                  Net cash provided by (used in) investing activities ......        14,676            368         (8,749)

Cash flows from financing activities:
   Proceeds from and increase in notes payable .............................         1,369            923          6,964
   Repayment of notes payable and principal payments under capital
     lease obligations .....................................................          (307)          (219)        (3,030)
   Purchase of treasury stock ..............................................            --             --            (11)
   Proceeds from issuance of stock .........................................            68         12,637         91,033
                                                                                 ---------      ---------      ---------
                  Net cash provided by financing activities ................         1,130         13,341         94,956
                                                                                 ---------      ---------      ---------

Net increase in cash and cash equivalents ..................................         1,762          4,546         15,884
Cash and cash equivalents at beginning of period ...........................         2,029         11,338             --
                                                                                 ---------      ---------      ---------

Cash and cash equivalents at end of period .................................     $   3,791      $  15,884      $  15,884
                                                                                 =========      =========      =========
Supplemental disclosures of cash flow information:
   Cash paid during the period for interest ................................     $      41      $     222      $   1,088
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 consolidated financial statements.


                                       -6-

<PAGE>   7


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)


                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                               SEPTEMBER 30, 1999
                                   (UNAUDITED)

1.       ORGANIZATION

         Aronex Pharmaceuticals, Inc. (the "Company" or "Aronex
Pharmaceuticals") is a development-stage company that 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 future revenues. In
addition, Aronex Pharmaceuticals expects to continue to incur losses for the
foreseeable future, and there can be no assurance that Aronex Pharmaceuticals
will successfully complete the transition from a development-stage company to
successful operations. The Company's research and development activities involve
a high degree of risk and uncertainty. The Company's ability 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 immensely impacted by
uncertainties related to patents and proprietary technologies, technological
change and obsolescence, product development, competition, government
regulations and approvals, health care reform, third-party reimbursement 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 The University of Texas M.D.
Anderson Cancer Center. Further, during the period required to develop these
products, the Company will require additional funds which may not be available
to it. Accordingly, there can be no assurance of its future success. See
"Business -- Additional Business Risks" in the 1998 Form 10-K.

         The consolidated balance sheet at September 30, 1999 and the related
consolidated statements of operations and cash flows for the three and nine
month periods ending September 30, 1999 and 1998 and the period from inception
(June 13, 1986) through September 30, 1999 are unaudited. These interim
financial statements should be read in conjunction with the audited financial
statements and related notes included in the 1998 Form 10-K. The unaudited
interim consolidated 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

         Principles of Consolidation

         The consolidated financial statements include the accounts of Aronex
Pharmaceuticals and its wholly owned subsidiary, Aronex Europe Limited. All
material intercompany transactions have been eliminated in consolidation.

         Cash, Cash Equivalents and Short- and Long-Term Investments

         Cash and cash equivalents include money market accounts and investments
with an original maturity of less than three months. At September 30, 1999,
short-term investments include held to maturity securities and available for
sale securities. The held to maturity securities consist of high-grade
commercial paper with a carrying value of $6,698,000 which approximates fair
market value. Available for sale securities consist of Targeted Genetics
Corporation Common Stock with an amortized cost of zero, a fair market value of
$817,000 and an unrealized gain of $817,000. Long-term investments at September
30, 1999 are available for sale securities which are United States
mortgage-backed securities with maturity dates over the next twenty-four years
that have an amortized cost of $927,000, which approximates fair market value.
Aronex Pharmaceuticals currently has no trading securities.


                                       -7-

<PAGE>   8


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)


3.        STOCKHOLDERS' EQUITY

          In February 1999, Aronex Pharmaceuticals raised proceeds net of
offering costs of approximately $11.7 million in a public offering of 6,000,000
shares of Common Stock. In connection with this offering, the Company issued
warrants to purchase 600,000 shares of Common Stock at an exercise price of
$3.28 per share. These warrants are exercisable from February 16, 2000 through
February 16, 2004. The fair value of the warrants, $758,400, was recorded in the
accompanying financial statements when they were issued. This amount has been
estimated on the date of the grant using the Black Scholes options pricing model
with the following weighted-average assumptions: a risk-free interest rate of
5.2% with no expected dividends, an expected life of five years and expected
volatility of 113%.

4.        FEDERAL INCOME TAXES

          At December 31, 1998, the Company had net operating loss ("NOL")
carryforwards for federal income tax purposes of approximately $102.2 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 the above NOL and tax credit carryforwards to
reduce future taxable income and tax liabilities may be limited. As a result of
the merger with Triplex Pharmaceutical Corporation "Triplex" and API Acquisition
Company, Inc. "API", 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 United States 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.
Due to the possibility of not reaching a level of profitability that will allow
for the utilization of the Company's deferred tax assets, a valuation allowance
has been established to offset these tax assets. The Company has not made any
federal income tax payments since inception.

5.        LICENSE, RESEARCH AND DEVELOPMENT AGREEMENT

          In March 1999, Genzyme Corporation ("Genzyme") notified the Company
that they did not intend to exercise their option to acquire the right to market
and sell ATRAGEN(R) worldwide. As a result of the election, the Company has
regained full marketing rights to ATRAGEN(R) on a worldwide basis and the
Company was obligated to repay Genzyme the $2.0 million advance by May 21, 1999
and pay product royalties, including $500,000 in minimum royalties by April 24,
2000. In May 1999, the $2.0 million advance from Genzyme and the $500,000 in
minimum royalties were converted into a $2.5 million convertible note payable to
Genzyme. This note bears interest at 10% per annum with interest payable
semi-annually, and the principal is due May 21, 2002. This note can be converted
into Common Stock of the Company at $4.35 per share at Genzyme's option. In
connection with this financing, the Company issued Genzyme warrants to purchase
50,000 shares of Common Stock at an exercise price of $4.00 per share. These
warrants are exercisable until May 21, 2004. The fair value of the warrants,
$150,000, was recorded in the accompanying financial statements when they were
issued. This amount has been estimated on the date of grant using the Black
Scholes option pricing model with the following weighted-average assumptions: a
risk free interest rate of 5.2% with an expected life of five years and expected
volatility of 114%.

6.        RECENT EVENTS

          In July 1999, an officer of the Company left under a severance
agreement and release. Under the agreement, the Company is obligated to pay this
officer a monthly salary of $13,333 plus certain benefits for a period of 12
months after termination and to accelerate the vesting of certain stock options.
In July 1999, the Company recorded a non-cash compensation expense of $177,600
relating to the stock options.

          On August 4, 1999, the FDA informed the Company that its invitation to
us to discuss the Company's ATRAGEN(R) NDA filing at the Oncologic Drugs
Advisory Committee, or ODAC, on September 17, 1999 had been

                                       -8-

<PAGE>   9


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)


withdrawn. The FDA cited deficiencies in our ATRAGEN(R) filing but did not
specify at the time what those deficiencies are or how we might correct them. On
September 24, 1999, the FDA provided the Company with an action letter citing
the deficiencies in the Company's ATRAGEN(R) submission. While the FDA has cited
such deficiencies, the FDA has not notified us of any safety issues associated
with ATRAGEN(R). While no assurances can be given that the deficiencies can be
resolved, management believes that we can effectively address the FDA issues,
and we have already formally advised them of our intention to amend our filing.
Additionally, we will meet with the FDA to address the issues they have raised
and to ensure that these are effectively addressed in our amendment. Once we
have had this meeting, we believe that we will be able to more clearly assess
our revised timetable.

          On October 6, 1999, the Board of Directors of the Company adopted a
shareholder rights plan resulting in the declaration of a dividend distribution
of one preferred stock purchase right for each outstanding share of common stock
of the Company. The shareholder rights plan was designed to deter coercive
takeover tactics and to prevent a change of control from occurring without the
stockholders of the Company receiving fair value.


                                       -9-

<PAGE>   10


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)



ITEM 2.
          MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
          RESULTS OF OPERATIONS

RESULTS OF OPERATIONS

          OVERVIEW

          Since our inception in 1986, we have primarily devoted our resources
to fund research, drug identification and development. We have been unprofitable
to date and expect to incur operating losses for the next several years as we
expend resources for product research and development, preclinical and clinical
testing and regulatory compliance. We have sustained net losses of approximately
$94.7 million from inception through September 30, 1999. We have primarily
financed our research and development activities and operations through
offerings of securities and research and development collaborations. Our
operating results have fluctuated significantly during each quarter, and we
anticipate 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 Nine Month Periods Ended September 30, 1998 and 1999

          Revenues from research and development grants and contracts increased
528% to $854,000 for the three months ended September 30, 1999 from $136,000 for
the three months ended September 30, 1998. Revenues from research and
development grants and contracts increased 3,152% to $10.7 million for the nine
months ended September 30, 1999 from $329,000 for the nine months ended
September 30, 1998. These increases resulted from $843,000 and $10.7 million in
milestone and development revenue under our license agreement for NYOTRAN(R)
with Abbott Laboratories ("Abbott") for the quarter and nine month periods
ending September 30, 1999.

          Interest income increased by 28% to $339,000 for the three months
ended September 30, 1999 from $265,000 for the three months ended September 30,
1998. Interest income decreased by 2% to $1,030,000 for the nine months ended
September 30, 1999, from $1,013,000 for the nine months ended September 30,
1998. These changes resulted from an increase in the average amount of funds
available for investment for the three months ended September 30, 1999 and a
decrease in the average amount of funds available for the nine months ended
September 30, 1999.

          Research and development expenses decreased by 10% to $5.0 million for
the three months ended September 30, 1999 from $5.5 million for the three months
ended September 30, 1998. The decrease in research and development expenses for
the three months ended September 30, 1999 described above resulted primarily
from a decrease of $1.1 million in clinical trial costs for NYOTRAN(R) as the
trials for this product are in the process of being completed.

          The decrease listed above was offset by the following:

          o    an increase of $184,000 in consulting fees relating to regulatory
               matters concerning NYOTRAN(R) and ATRAGEN(R);
          o    an increase of $100,000 in salaries and payroll costs; and
          o    an increase of $242,000 in drug materials and manufacturing costs
               for ATRAGEN(R).


                                      -10-

<PAGE>   11


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)



          Research and development expenses increased by 2% to $15.7 million for
the nine-month period ending September 30, 1999 from $15.4 million for the
nine-month period ending September 30, 1998. The increase in research and
development expenses for the nine months ended September 30, 1999 described
above resulted primarily from:

          o    an increase of $1.1 million in salaries and payroll costs;
          o    an increase of $432,000 in consulting fees relating to regulatory
               matters concerning NYOTRAN(R) and ATRAGEN(R); and
          o    an increase of $187,000 in outside research consultants and
               contracts.

          The increases listed above were offset by a decrease of $972,000 in
drug materials and manufacturing costs for NYOTRAN(R) and Annamycin, and a
decrease of $231,000 in outside pharmacology and toxicology studies relating
mainly to NYOTRAN(R).

          Selling, general and administrative expenses increased 55% to $1.4
million for the three months ended September 30, 1999 from $901,000 for the
three months ended September 30, 1998. Selling, general and administrative
expenses increased 29% to $3.1 million for the nine months ended September 30,
1999 from $2.4 million for the nine months ended September 30, 1998. This
increase in selling, general and administrative expenses for the three and nine
months ended September 30, 1999 resulted primarily from:

          o   increases of $351,000 and $448,000, respectively, in marketing
              salaries and payroll costs, including deferred compensation. These
              increases were due mainly to expenses under a July 1999 severance
              and release agreement with an officer of the Company;
          o   increases of $302,000 and $353,000 respectively in business
              consultants; and
          o   an increase of $215,000 in marketing expenses relating mainly to
              ATRAGEN(R) for the nine months ended September 30, 1999.

          These increases were partially offset by decreases of $116,000 and
$366,000 in salaries and payroll costs, including deferred stock option
compensation, for general and administrative personnel. Salary and payroll costs
were less in 1999 due mainly to termination and severance payments to the
Company's former president recorded in the first quarter of 1998.

          Interest expense and other increased 430% to $143,000 for the three
months ended September 30, 1999 from $27,000 for the three months ended
September 30, 1998. Interest expense and other increased 527% to $257,000 for
the nine months ended September 30, 1999 from $41,000 for the nine months ended
September 30, 1998. The increase in interest expense was primarily due to the
following:

          o   an increase in the balance of notes payable obtained to finance
              furniture and equipment; and
          o   an increase of $2.5 million in notes payable relating to a
              promissory note issued to Genzyme in the second quarter of 1999.

          Net loss decreased by $660,000 resulting in a loss of $5.4 million for
the three months ended September 30, 1999. Net loss decreased by $9.2 million to
$7.3 million for the nine months ended September 30, 1999. These decreases were
due mainly to increased revenue of $792,000 and $10.4 million for the three- and
nine- month periods ending September 30, 1999, respectively.


                                      -11-

<PAGE>   12


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)


LIQUIDITY AND CAPITAL RESOURCES

          Since inception, our primary source of cash has been from financing
activities, which have consisted primarily of sales of equity securities. We
have raised an aggregate of approximately $90 million from the sale of equity
securities from our inception through September 30, 1999. In July 1992, we
raised net proceeds of approximately $10.7 million in our initial public
offering of Common Stock. In September 1993, we entered into a collaborative
agreement with Genzyme relating to the development and commercialization of
ATRAGEN(R), in which we received net proceeds of approximately $4.5 million from
the sale of Common Stock to Genzyme. We received the following net proceeds in
public offerings of our Common Stock on the following dates:

          o    November 1993     $11.5 million
          o    May 1996          $32.1 million
          o    February 1999     $11.7 million

          From October 1995 through December 31, 1997, we received aggregate net
proceeds of approximately $6.5 million from the exercise of certain warrants
issued in a 1995 merger. In November 1998, we entered into a license agreement
with Abbott relating to NYOTRAN(R), in which Abbott purchased 837,989 shares of
Common Stock for $3.0 million. Through September 30, 1999, we received an
additional $14.7 million in up-front and milestone payments from Abbott, all of
which are non-refundable.

          In September 1996, Genzyme advanced us $2.0 million relating to a $5.0
million equity milestone. Early in 1997, we amended the agreement through which
(1) we released Genzyme from any further obligation to perform development work
for ATRAGEN(R) and (2) the license granted to Genzyme under the agreement was
converted to an option to acquire the right to market and sell ATRAGEN(R)
worldwide. We retained co-promotion rights in the United States. If Genzyme had
exercised its option, Genzyme would have been required to pay us $3.0 million
and product royalties, and we would have been entitled to retain the $2.0
million advance. In March 1999, Genzyme notified us that they did not intend to
exercise their option. As a result of the election, we regained full marketing
rights to ATRAGEN(R) on a worldwide basis and we were obligated to repay Genzyme
the $2.0 million advance by May 21, 1999 and to pay product royalties, including
$500,000 in minimum royalties by April 24, 2000. In May 1999, the $2.0 million
advance and $500,000 in minimum royalties were converted into a $2.5 million
convertible promissory note payable which bears interest at 10% per annum.

          The majority of our development activities are committed on a
short-term, as-needed basis through contracts and purchase orders. These
arrangements can be changed based on our needs and development activities. We
have contracted with certain clinical research organizations to conduct our
clinical trials outside of the United States for NYOTRAN(R) in the following
indications: cryptococcal meningitis, presumed fungal infections and Aspergillus
salvage. The remaining amount projected to be expended to complete the clinical
research organizations' activities with respect to those indications is less
than $500,000. The agreements provide that we can terminate them at any time,
should either our financial situation or the results of the studies require it.
Nonetheless, we intend to continue to engage clinical research organizations in
the future to monitor our various clinical trials outside of the United States.

          Our primary use of cash to date has been in operating activities to
fund research and development, including preclinical studies and clinical trials
and selling, general and administrative expenses. We used cash of $9.2 million
and $14.0 million in operating activities during the first nine months of 1999
and 1998, respectively. We had cash, cash-equivalents and short-term and
long-term investments of $24.3 million as of September 30, 1999, consisting
primarily of cash and money market accounts, and United States government
securities, common stock and investment grade commercial paper.

                                      -12-

<PAGE>   13


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)



          We have experienced negative cash flows from operations since our
inception and we have funded our activities to date primarily from equity
financing and corporate collaborations. We have expended, and will continue to
require, substantial funds to continue research and development, including
preclinical studies and clinical trials of our products, and to commence sales
and marketing efforts if the U.S. Food and Drug Administration and other
regulatory approvals are obtained.

          We expect that our existing financial resources should be sufficient
to fund our capital requirements into the year 2001. During this period, we
anticipate receiving further payments from Abbott under the license agreement
for NYOTRAN(R); however, these payments are dependent upon performance and are
not guaranteed. In the future, we may need to raise substantial additional
capital to fund our operations.

          We have experienced significant increases in accounts payable and
accrued payroll since 1996, primarily as a result of the increased development
activities relating to our two late-stage products, NYOTRAN(R) and ATRAGEN(R).
We anticipate that the amounts expended for these items in the future will
continue to correspond with our development activities. If the volume of
development activities decreases, there will be a decrease in outstanding
payables and a decrease in our liquidity position. We expect that our expenses
relating to development activities will fluctuate from quarter to quarter over
the next few years as we have not yet generated revenues from product sales. We
have typically obtained debt financing when necessary for equipment, furniture
and leasehold improvement requirements. We expect that we will continue to incur
additional debt to meet our capital requirements from time to time in the
future, based on our financial resources and needs.

          Our capital requirements will depend on many factors, including those
factors more completely described under "Business -- Additional Business Risks"
in our 1998 Form 10K. These factors include:

          o   problems, delays, expenses and complications frequently
              encountered by development-stage companies;
          o   the progress of our research, development and clinical trial
              programs;
          o   the extent and terms of any future collaborative research,
              manufacturing, marketing or other funding arrangements;
          o   the costs and timing of seeking regulatory approvals of our
              products;
          o   our ability to obtain regulatory approvals;
          o   the success of our sales and marketing programs;
          o   the costs of filing, prosecuting and defending and enforcing any
              patent claims and other intellectual property rights; and
          o   changes in economic, regulatory or competitive conditions of our
              planned business.

          Estimates about the adequacy of funding for our activities are based
on certain assumptions, including the assumption that testing and regulatory
procedures relating to our products can be conducted at projected costs. We
cannot assure that changes in our research and development plans, acquisitions,
or other events will not result in accelerated or unexpected expenditures.

          To satisfy our capital requirements, we may seek to raise additional
funds in the public or private capital markets. Our ability to raise additional
funds in the public or private markets on terms favorable to the Company and its
stockholders may have been adversely affected by recent developments regarding
ATRAGEN(R). On August 4, 1999, the FDA informed us that its invitation to us to
discuss our ATRAGEN(R) NDA filing at the Oncologic Drugs Advisory Committee, or
ODAC, on September 17, 1999 had been withdrawn. The FDA cited deficiencies in
our ATRAGEN(R) filing but did not specify at the time what those deficiencies
are or how we might correct them. On September 24, 1999, the FDA provided us
with an action letter citing the deficiencies in our ATRAGEN(R) submission.
While the FDA has cited such deficiencies, the FDA has not notified us of any
safety issues associated with ATRAGEN(R). While no assurances can be given that
the deficiencies can be resolved, management believes that we can effectively
address the FDA issues, and we have already formally advised them of our
intention to amend our filing. Additionally, we will meet with the FDA to
address the issues they have raised and to ensure that these are

                                      -13-

<PAGE>   14


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)


effectively addressed in our amendment. Once we have had this meeting, we
believe that we will be able to more clearly assess our revised timetable.

          We may seek additional funding through corporate collaborations and
other financing vehicles. We cannot assure that any funding will be available to
us on favorable terms or at all. If adequate funds are not available, we may be
required to curtail significantly one or more of our programs, or we may be
required to obtain funds through arrangements with future collaborative partners
or other parties that may require us to relinquish rights to some or all of our
technologies or products. If we are 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 our Common
Stock.

YEAR 2000

          Year 2000 issues result from the inability of certain computer
programs or computerized equipment to accurately calculate, store or use a date
subsequent to December 31, 1999, typically occurring because such programs or
equipment erroneously interpret the year 2000 as the year 1900. System failure
or miscalculations could result causing disruptions of operations, including,
among other things, a temporary inability to process transactions, send invoices
or engage in similar normal business.

          We are in the process of assessing all of our financial and
operational systems and equipment to ensure year 2000 compliance. We have
completed our initial review of our financial and operational systems and
equipment, with the exception of certain personal computer and network hardware
which we are continuing to assess. Except for the personal computer and network
hardware that remains under assessment, we have either obtained certifications
as to year 2000 compliance from vendors or have tested the year 2000 compliance
of substantially all our systems and equipment, and have taken the steps we
believe will be necessary to remediate year 2000 problems associated with the
systems and equipment that we have determined not to be year 2000 compliant. We
have completed our assessment of our financial and operational systems and
equipment. We believe that the potential impact, if any, of our systems not
being year 2000 compliant could result in the loss of data, which is available
in hard-copy, that would have to be re-entered. We believe that any loss of
computer data will not materially affect our ability to continue our research
and development activities or have a material adverse effect on our business,
results of operations or financial condition. However, this potential loss of
data could result in a material delay in completing clinical studies of our
products which could have a material adverse effect on our business, results of
operations and financial condition.

          We are in the process of contacting our consultants and other
suppliers of goods and services, as well as our corporate partners, to assess
the possible impact of year 2000 compliance of their systems and equipment on
us. We plan to complete our assessment of these matters by November 30, 1999. We
believe that the potential impact, if any, of the systems of our consultants
(including clinical research organizations and hospitals), suppliers and
corporate partners not being year 2000 compliant could result in the loss of
data, which is available in hard-copy, that would have to be re-entered. Any
loss of computer data will not materially affect our ability to continue our
research and development activities. However, this potential loss of data could
result in a material delay in completing clinical studies of our products which
could have a material adverse effect on our business, results of operations and
financial condition.

          Based on our assessments and remediation efforts to date, we do not
anticipate incurring any significant costs relating to the assessment and
remediation of year 2000 issues. To date, we estimate that we have spent less
than $25,000 in reviewing and remediating year 2000 issues and that total
expenditures incurred in completing our review and remediation efforts will not
exceed $100,000. However, we cannot assure that planned expenditures for these
efforts will not exceed such amount should unforeseen complications arise during
such review and assessment or as a result of our remediation efforts or those of
our vendors, consultants or corporate partners. Such expenditures are budgeted
as part of our operating expenses. Also, there can be no assurance that we or
our consultants, suppliers and corporate partners will successfully be able to
identify and remedy all potential year 2000 problems or that a system failure
resulting from a failure to identify any problems would not have a material
adverse effect on us.


                                      -14-

<PAGE>   15


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)


          We have developed and are implementing a contingency plan of
maintaining in hard copy form all data that is generated or collected by us or
our collaborators, including clinical research organizations, hospitals,
physicians, consultants and others. Any loss of data due to year 2000 problems
could be re-entered manually. We also maintain all of our accounting records in
hard copy so that we can continue to manually pay vendors, employees,
consultants and collaborators in the event that our accounting software or other
computer programs or systems malfunction due to the year 2000 issue. We also
have keys to the doors of our facilities to enable us to gain access to our
laboratory and offices in the event that the building's security systems
malfunction. We are continuing to review these and related operational
requirements in order to complete our contingency plan for our non-critical
business functions.

ITEM 3.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

           Not applicable.


                                      -15-

<PAGE>   16


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)


PART II.        OTHER INFORMATION

ITEM 6.        EXHIBITS AND REPORTS ON FORM 8-K

    (a) Exhibits

    10.1      Severance Agreement and Release dated July 30, 1999 between the
              Company and Janet Walter.

    10.2      Consulting Agreement dated October 1, 1999 between the Company and
              James R. Butler.

    10.3      Consulting Agreement dated October 1, 1999 between the Company and
              David J. McLachlan.

    11.1      Statement Regarding Computation of Share Earnings.

    27.1      Financial Data Schedule.


    (b) Reports on Form 8-K

        None

                                      -16-

<PAGE>   17


                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)


                                   SIGNATURES

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



                          ARONEX PHARMACEUTICALS, INC.




Dated:   November 5, 1999           By: /s/ GEOFFREY F. COX
                                       -----------------------------------
                                    Geoffrey F. Cox, Ph.D.
                                    Chief Executive Officer







Dated:   November 5, 1999           By: /s/ TERANCE A. MURNANE
                                       -----------------------------------
                                    Terance A. Murnane
                                    Controller
                                    (Principal Financial and Accounting Officer)


                                      -17-

<PAGE>   18


                               INDEX TO EXHIBITS

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                   DESCRIPTION
- -------                  -----------
<S>           <C>
    10.1      Severance Agreement and Release dated July 30, 1999 between the
              Company and Janet Walter.

    10.2      Consulting Agreement dated October 1, 1999 between the Company and
              James R. Butler.

    10.3      Consulting Agreement dated October 1, 1999 between the Company and
              David J. McLachlan.

    11.1      Statement Regarding Computation of Share Earnings.

    27.1      Financial Data Schedule.
</TABLE>

<PAGE>   1
                                                                    EXHIBIT 10.1

                         SEVERANCE AGREEMENT AND RELEASE

         This Severance Agreement and Release ("Agreement") is being entered
into as of July 30, 1999, by and between Janet M. Walter ("Employee") and Aronex
Pharmaceuticals, Inc. ("Aronex") in order to further the mutually desired terms
and conditions set forth herein:

         WHEREAS, Employee has notified Aronex of her desire to voluntarily
resign as an employee and officer of Aronex and Aronex desires to accept such
resignation; and

         WHEREAS, the parties desire to execute and deliver this Agreement to
evidence the terms of the parties' agreement concerning the Employee's
resignation.

         NOW, THEREFORE, in consideration of the premises and the mutual
covenants contained herein, the receipt and sufficiency are hereby acknowledged,
the parties do hereby agree as follows:

         1.       RESIGNATION. Employee hereby voluntarily resigns as an
employee and officer of Aronex effective as of July 13, 1999 (the "Effective
Date of Resignation").

         2.       SEVERANCE.

                  (a)     For and in consideration of the execution of this
                          Agreement, Aronex will, subject to the terms set forth
                          herein, pay to Employee a total payment of $160,000.00
                          ("Severance Payment"), less standard deductions. The
                          Severance Payment shall be paid in twenty-four (24)
                          semimonthly payments of $6,666.66, subject to standard
                          deductions, for the period beginning as of July 16,
                          1999 and continuing through July 15, 2000, payable as
                          and when Employee would have otherwise received her
                          salary. The obligation of Aronex to pay, and the
                          Employee's right to receive, the Severance Payment
                          herein provided shall not terminate upon the
                          Employee's commencement of employment with another
                          employer.

                  (b)     In addition to the foregoing, and in further
                          consideration of the execution of this Agreement,
                          Aronex does hereby agree to amend the terms of those
                          three (3) certain stock options previously granted by
                          Aronex to Employee as follows:

                          (i)      That certain Non-Qualified Stock Option
                                   Agreement dated August 18, 1997, for 13,610
                                   shares of the Company's common stock, par
                                   value $.001 per share (the "Common Stock")
                                   and that certain Incentive Stock Option
                                   Agreement dated August 18, 1997, for 86,390
                                   shares of Common Stock are each hereby
                                   amended to allow, under Section 4 of each
                                   such agreement, the exercise of the vested
                                   portions of the options evidenced thereby for
                                   a period of up to ninety (90) days following
                                   the Effective Date of Resignation.



                                  1 of 7 pages

<PAGE>   2



                          (ii)     That certain Non-Qualified Stock Option
                                   Agreement dated December 10, 1998 for 50,000
                                   shares of the Company's Common Stock (the
                                   "'98 Option Agreement") is hereby amended as
                                   follows:

                                   (A) The option evidenced by the '98 Option
                                   Agreement shall, subject to the terms of this
                                   Agreement, be fully vested and exercisable as
                                   of the Effective Date of Resignation.

                                   (B) The '98 Option Agreement is amended to
                                   allow, under Section 4 thereof, the exercise
                                   of the option evidenced thereby for a period
                                   of up to ninety (90) days following the
                                   Effective Date of Resignation.

                          In all other respects, the terms and provisions of the
                          above described Stock Option Agreements shall remain
                          in full force and effect as originally written.


                  (c)     The Employee and Aronex hereby stipulate and agree
                          that as of the effective date of this Agreement and
                          after giving effect to the amendments in Paragraph
                          1(a) above, the number of shares of Common Stock
                          vested, and which may be acquired upon the exercise of
                          such options, shall be as follows:

                          (i)      Non-Qualified Stock Option Agreement dated
                                   August 18, 1997 -- 13,610 shares;

                          (ii)     Incentive Stock Option Agreement dated August
                                   18, 1997 -- 49,077 shares; and

                          (iii)    Non-Qualified Stock Option Agreement dated
                                   December 10, 1998 -- 50,000 shares.

                  (d)     Except as provided in Paragraph 3 below, the Severance
                          Payment and the amendments of the above described
                          Stock Option Agreements represent the exclusive
                          consideration given by Aronex in connection with or
                          arising out of the termination of Employee's
                          employment with Aronex, and no further amounts or
                          other consideration shall be required for any items,
                          including, but not limited to, attorneys' fees.

         3.       RELEASE.

                  (a)     Employee, on behalf of herself, her heirs,
                          beneficiaries and personal representatives hereby
                          releases, acquits and forever discharges Aronex, its
                          officers, employees, former employees, shareholders,
                          directors, partners, agents and assigns, and all other
                          persons, firms, partnerships, or corporations in
                          control of, under the direction of, or in any way
                          presently or formerly associated with Aronex, of and
                          from all claims, charges, complaints, liabilities,
                          obligations, promises, agreements, contracts, damages,
                          actions,


                                  2 of 7 pages

<PAGE>   3



                          causes of action, suits, accrued benefits or other
                          liabilities of any kind or character, whether known or
                          hereafter discovered, arising from or in any way
                          connected or related with employment with Aronex, her
                          resignation and termination of employment with Aronex,
                          including, but not limited to, allegations of wrongful
                          termination, breach of contract (other than in
                          connection with this Agreement), intentional
                          infliction of emotional distress, negligent infliction
                          of emotional distress, defamation, invasion of
                          privacy, any action in tort or contract, any violation
                          of any federal, state, or local law, (including, but
                          not limited to, and violation of Title VII of the
                          Civil Rights Act of 1964, as amended, 42 U.S.C.
                          Section 2000e et seq., the Civil Rights Act of 1866,
                          42 U.S.C. Section 1981 et seq., the Equal Pay Act, 29
                          U.S.C. Section 206; the Employee Retirement Income
                          Security Act of 1974, as amended ("ERISA") 29 U.S.C.
                          Section 1001 et seq., the Americans with Disabilities
                          Act, 42 U.S.C. Section 12101 et seq., the Age
                          Discrimination Employment Act of 1967, as amended
                          ("ADEA"), 29 U.S.C. Section 621 et seq., the Fair
                          Labor Standards Act, as amended, 29 U.S.C. Section 201
                          et seq., the National Labor Relations Act, 29 U.S.C.
                          Sections 151 et seq., the Family and Medical Leave Act
                          of 1993, 29 U.S.A. Section 2601 et seq., the Worker
                          Adjustment and Retraining Notification Act (WARN), 29
                          U.S.C., Section 2101 et seq., the Texas Commission on
                          Human Rights Act, Texas Labor Code Section 21.001 et
                          seq., the Texas Payday Act, Texas Labor Code, Section
                          61.01 et seq., the Texas Workers' Compensation
                          Statute, Texas Labor Code Section 451.0001 et seq.,
                          and any other employment or civil rights act and,
                          except as provided below, any and all claims for
                          severance pay or benefits under any compensation or
                          employee benefit plan, program, policy, contract,
                          agreement or other arrangement of Aronex.
                          Notwithstanding the foregoing, for so long as Employee
                          shall continue to be eligible to receive benefits
                          under the Consolidated Omnibus Budget Reconciliation
                          Act of 1985 ("COBRA"), the Employee shall be entitled
                          to receive benefits under the then existing medical,
                          dental and vision employee benefit plans maintained by
                          Aronex. Aronex shall pay all premiums for such
                          medical, dental and vision benefit plans while
                          Employee is entitled to receive such benefits under
                          COBRA. Employee acknowledges and agrees that Employee
                          shall not be permitted to participate in, and Aronex
                          shall have no obligation to provide, any coverage
                          under any disability or life insurance plans
                          maintained by Aronex for the benefits of its
                          employees.

                  (b)     Employee agrees not to commence any legal proceeding
                          or lawsuit against Aronex arising out of or based upon
                          employment with Aronex or the termination of
                          employment with Aronex.

                  (c)     The consideration cited above and the promises
                          contained herein are made for the purpose of
                          purchasing the peace of Aronex and Employee and are
                          not to be construed as an admission of liability or as
                          evidence or unlawful conduct by Aronex or any of its
                          affiliates, all liability being expressly denied.

                  (d)     Employee voluntarily accepts the consideration cited
                          herein as sufficient payment for the full, final and
                          complete release stated herein and agrees that


                                  3 of 7 pages

<PAGE>   4



                          no other promises or representations have been made by
                          Aronex or any other person purporting to act on behalf
                          of Aronex, except as expressly stated herein.

                  (e)     Employee understands that this is a full, complete,
                          and final release of Aronex. As evidenced by the
                          signature below, Employee expressly promises and
                          represents to Aronex that she has completely read this
                          Agreement and understand its terms, contents,
                          conditions, and effects.

                  (f)     Employee hereby waives all rights to recall,
                          reinstatement, reemployment and past or future wages
                          from Aronex and any affiliate thereof and further
                          acknowledges that Employee is not entitled to any
                          continued participation in, or benefits under, any
                          employee benefit plan or compensation program of
                          Aronex or any of affiliate thereof, including without
                          limitation, any profits, bonus or commission
                          arrangement, and any other employment agreement
                          (whether written or oral) with Aronex, except as may
                          otherwise may be required by ERISA, COBRA or otherwise
                          expressly set forth in Paragraph 3(a) above.

         4.       CONFIDENTIALITY.

                  (a)     For a period of three (3) years from the date of this
                          Agreement, Employee hereby agrees to hold and maintain
                          confidential and private in trust for the benefit of
                          Aronex and its affiliates all secret, confidential or
                          proprietary information of Aronex and/or its
                          affiliates including, without limitation, all
                          information pertaining to the research, design,
                          development, manufacture and sales of Aronex's
                          products including, without limitation, the findings,
                          reports, inventions, discoveries, developments,
                          improvements and confidential sales information,
                          pricing, terms and related data disclosed to Employee
                          by Aronex or any affiliate thereof or written,
                          invented or made or conceived by Employee in
                          connection with her employment by Aronex. Confidential
                          information shall not include any information which
                          (i) is, or lawfully becomes, generally available to
                          the public without fault of Employee, or (ii) is
                          independently developed, as shown by clear, convincing
                          written evidence, by Employee prior to the receipt of
                          any confidential information, (iii) is lawfully
                          obtained or acquired by Employee in good faith from a
                          third party other than a party furnishing the
                          information to Aronex, who has such information in
                          good faith and not under any confidentiality agreement
                          with any other party with respect to such information,
                          (iv) is in Employee's possession at the time of
                          disclosure other than as a result of Employee's breach
                          of any legal obligation, or (v) is required to be
                          disclosed by Employee to comply with the applicable
                          laws or governmental requirements, provided that
                          Employee provides prior written notice of such
                          disclosure to Aronex.

                  (b)     Employee agrees to hold and maintain confidential and
                          not disclose to any third party the terms and
                          conditions of this Agreement including, without


                                  4 of 7 pages

<PAGE>   5



                          limitation, the Severance Payment and other
                          consideration provided for by this Agreement;
                          provided, however, that the foregoing shall not apply
                          to any disclosure that may be required to the extent
                          compelled by legal process or necessary to enforce the
                          Employee's rights hereunder.

         5.       NON-DISPARAGEMENT. Employee agrees not to communicate or
                  disseminate to others, whether verbally, in writing or in any
                  other form, any derogatory, negative or intentionally damaging
                  statements regarding Aronex, its affiliates, its officers,
                  directors, employees, policies or practices. Aronex agrees not
                  to communicate or disseminate to others, whether verbally, in
                  writing or in any other form, any derogatory, negative or
                  intentionally damaging statements regarding Employee.

         6.       NO ASSIGNMENT OF CLAIMS. Employee hereby warrants that she has
                  not assigned, transferred or conveyed at any time to any
                  individual or entity any alleged right, claim or cause of
                  action against Aronex or any Aronex affiliate. Employee agrees
                  to and does hereby indemnify and hold Aronex and the Aronex
                  affiliates harmless from any claims, liabilities, damages,
                  demands, losses, costs, debts and causes of action whatsoever,
                  including without limitation attorney's fees, whether known or
                  unknown, which may be asserted by parties for breach of the
                  foregoing warranty.

         7.       REPRESENTATIONS AND WARRANTIES CONCERNING RELEASE. Employee
                  hereby warrants to Aronex that she has completely read this
                  Agreement prior to executing it, and has had a reasonable
                  period of time within which to consider this Agreement and to
                  understand its terms, contents, conditions and effects and has
                  entered into this Agreement knowingly and voluntarily.
                  Employee understands that she has the right to consult an
                  attorney of her choice and represents that she has consulted
                  with an attorney or she has knowingly decided not to do so.
                  Employee states that she is not presently affected by any
                  disability which would prevent him from knowingly and
                  voluntarily executing this Agreement, and further states that
                  the promises made herein are not made under duress, coercion
                  or undue influence.

         8.       DEFAULT. In the event of a breach by the Employee of the
                  provisions of Paragraphs 4 and 5 of this Agreement, Aronex
                  shall be entitled to an injunction restraining the Employee
                  from using or disclosing, for her benefit or for the benefit
                  of others, in whole or in part, any confidential information
                  or otherwise making any derogatory, negative or damaging
                  statements regarding Aronex or its affiliates. In addition,
                  upon any such breach of Paragraphs 4 or 5 of this Agreement,
                  (i) Aronex's obligations to make any Severance Payment as
                  called for by this Agreement shall cease and Aronex shall have
                  no further liability or obligation to make any Severance
                  Payment to Employee as otherwise required under the terms of
                  Paragraph 1 of this Agreement, and (ii) the accelerated
                  vesting of the options evidenced by the '98 Option Agreement
                  shall no longer be effective and the Employee shall only be
                  permitted to exercise such '98 Option Agreement to the extent
                  vested as of the Effective Date of Resignation. In addition to
                  the foregoing, upon any such breach Aronex shall be permitted
                  to pursue any and all other remedies otherwise available to
                  Aronex for such breach including, without limitation, the
                  recovery of damages from the Employee.


                                  5 of 7 pages

<PAGE>   6



         9.       AMENDMENT. This Agreement may not be amended or modified in
                  any respect except by an agreement in writing executed by the
                  parties in the same manner as this Agreement.

         10.      SUCCESSORS. This Agreement shall be binding upon and shall
                  inure to the benefit of and be enforceable by each of the
                  parties and their respective successors and assigns.

         11.      INVALID PROVISIONS. If any provision of this Agreement is held
                  to be illegal, invalid or unenforceable under present or
                  future law effective during the term hereof, such provision
                  shall be fully severable. This Agreement shall be construed
                  and enforced as if such illegal, invalid or unenforceable
                  provision had never comprised a part hereof and the remaining
                  portions hereof shall remain in full force and effect and
                  shall not be affected by the illegal, invalid or unenforceable
                  provision or by its severance herefrom. Furthermore, in lieu
                  of such illegal, invalid or unenforceable provision, there
                  shall be added automatically, as part of this Agreement, a
                  provision similar in terms to such illegal, invalid or
                  unenforceable provision as may be possible and be legal, valid
                  and enforceable.

         12.      DESCRIPTIVE HEADINGS. The descriptive headings of the several
                  sections of this Agreement are inserted for convenience only
                  and shall not control or affect the meaning or construction of
                  any of the provisions hereof.

         13.      GOVERNING LAW. This Agreement shall be governed by and
                  construed and enforced in accordance with the laws of the
                  State of Texas.

         14.      ENTIRE AGREEMENT. This Agreement constitutes the entire
                  agreement between the parties hereto with respect to the
                  subject matter of this Agreement and supersedes and is in full
                  substitution for any and all prior agreements and
                  understandings whether written or oral between said parties
                  relating to the subject matter of this Agreement.

         15.      MULTIPLE COUNTERPARTS. This Agreement may be executed in
                  multiple counterparts, each of which shall be deemed an
                  original and, when taken together, shall constitute one
                  agreement which shall be binding upon and effective as to all
                  parties.

                  IN WITNESS WHEREOF, the parties have duly executed this
Agreement effective as of the date first above written.

                                     EMPLOYEE:


                                     /s/ Janet M. Walter
                                     -----------------------------------------
                                     Janet M. Walter




                                  6 of 7 pages

<PAGE>   7


                                     ARONEX PHARMACEUTICALS, INC.



                                     By:    /s/ Geoffrey F. Cox
                                        --------------------------------------
                                     Name:  Geoffrey F. Cox
                                          ------------------------------------
                                     Title: Chairman and CEO
                                           -----------------------------------


                                  7 of 7 pages



<PAGE>   1
                                                                    EXHIBIT 10.2

                              CONSULTING AGREEMENT


         This CONSULTING AGREEMENT (this "Agreement") is entered into as of the
effective date specified below by and between ARONEX PHARMACEUTICALS, INC., a
Delaware corporation (the "Company"), and the undersigned consultant whose name
and address appear below ("Consultant"). The Company and Consultant hereby
agree as follows:

         1. CONSULTING SERVICES. Consultant is hereby engaged by the Company as
an independent contractor, and not as an employee, to carry out the project
specified in the Description of Work attached hereto as Exhibit A, on the terms
and conditions set forth in such Description of Work.

         2. TERM. This Agreement shall commence on October 1, 1999 and shall
automatically renew for successive one year periods. This Agreement may be
terminated by Consultant or Company, with or without "cause" (as defined below),
by giving 30 days' advance written notice thereof to the other party hereto. In
addition, this Agreement may be terminated by the Company immediately for
"cause". For purposes of this Agreement, "cause" shall be deemed to exist for
termination of this Agreement by the Company in the event (i) Consultant is not
performing in compliance with the Description of Work, (ii) Consultant has
engaged in personal conduct which (in the good faith determination of the
Company) would materially injure the goodwill or reputation of the Company or
otherwise materially adversely affect the interests of the Company or (iii) of
any breach by Consultant of the obligations contained in this Agreement or any
other agreement between the Company and Consultant.

         In the event of any termination of this Agreement prior to completion
of the term of this Agreement pursuant to the above provisions (whether with or
without "cause"), the Company's sole liability thereupon will be to pay
Consultant any unpaid balance due for work performed up to and including the
date of termination, if applicable.

         3. INDEPENDENT CONTRACTOR. It is agreed that Consultant's services are
made available to the Company on the basis that Consultant will retain
Consultant's individual professional status and that Consultant's relationship
with the Company is that of an independent contractor and not that of an
employee. Consultant will not be eligible for any employee benefits, nor will
the Company make deductions from its fees to Consultant for taxes, insurance,
bonds or any other subscription of any kind. Consultant will use Consultant's
own discretion in performing the tasks assigned, within the scope of work
specified by the Company. Consultant agrees to indemnify and hold the Company
harmless from and against any claim made by any third party against the Company
based in whole or in part upon any action by Consultant or any of Consultant's
employees, associates, consultants, agents, representatives, assignees or
successors in interest (collectively, "Consultant's Associates"), which occurs
pursuant to or in connection with this Agreement or the relationship or
relationships contemplated by this Agreement.

         4. CONFIDENTIAL INFORMATION. Consultant agrees that Consultant, and all
of Consultant's Associates, shall keep in strictest confidence all information
relating to the products, materials, programs, algorithms, designs, trade
secrets, secret processes, customers and markets of the Company and all other
confidential knowledge, data and information related to the business or affairs
of the Company (collectively, "Confidential Information") that may be acquired
pursuant to or in connection with this Agreement or the relationship or
relationships contemplated by this Agreement. During and after the term of this
Agreement, neither Consultant nor any of Consultant's Associates will, without
the prior written consent of an officer of the Company, publish, communicate,
disclose or use for any purpose any of such Confidential

                                        1

<PAGE>   2



Information. Upon termination of this Agreement, Consultant will return to the
Company all records, data, notes, reports, printouts, sketches, material,
equipment and other documents or property, and all reproductions of any of the
foregoing, furnished by the Company or developed or prepared pursuant to the
relationship hereunder.

         Notwithstanding the foregoing, it is agreed that Confidential
Information shall not include any (i) information which is or becomes through no
fault of Consultant or any of Consultant's Associates generally known to the
public, and (ii) Consultant's and Consultant's Associates' skill, knowledge,
know-how and experience.

         5. ASSIGNMENT OF INTELLECTUAL PROPERTY. Consultant agrees to transfer
and assign and hereby does transfer and assign to the Company the entire right,
title and interest for the entire world in and to all data, materials, software,
designs, models, algorithms, writings, drawings, notebooks, documents,
photographs, inventions and discoveries (collectively, "Inventions") made or
conceived or reduced to practice by Consultant or any of Consultant's Associates
(i) in the course of accomplishing the work described on the Description of Work
attached as Exhibit A hereto, (ii) in the course of accomplishing other work
performed pursuant to the relationship established by this Agreement, or (iii)
with the use of materials or facilities of the Company.

         Consultant agrees that Consultant and each of Consultant's Associates
will sign, execute and acknowledge, or cause to be signed, executed and
acknowledged, at the expense of the Company, any and all documents, and will
perform any and all acts, as may be necessary, useful or convenient for the
purpose of securing to the Company or its nominee patent, trademark or copyright
protection throughout the world upon all such Inventions. At the request of the
Company, Consultant will have each of Consultant's Associates with access to
Confidential Information of the Company or who performs work pursuant to this
Agreement to sign an agreement in form substantially identical to this
Agreement.

         6. LICENSE RIGHTS. In the event that Consultant recommends to the
Company that the Company make use of devices and/or processes covered by patents
and/or patent applications which Consultant may own or control, Consultant will
then so inform the Company, and in the event that the Company shall follow
Consultant's recommendation and Consultant has the right to grant a license
under such patents and/or patent applications, then Consultant will grant to the
Company a license on reasonable terms which are no less favorable than those
granted by Consultant to any other licensee.

         7. REPRESENTATIONS OF CONSULTANT AND THE COMPANY.

                  1. Consultant represents and warrants to the Company that (i)
this Agreement is a valid and binding obligation of Consultant, enforceable
against Consultant in accordance with its terms, and (ii) his execution and
delivery of, and performance of his services and other obligations under, this
Agreement will not result in the breach or violation of applicable law or any
agreement to which he is a party.

                  2. The Company represents and warrants to Consultant that (i)
this Agreement has been duly and validly authorized by the Company and is a
valid and binding obligation of the Company, enforceable against the Company in
accordance with its terms, and (ii) its execution and delivery of, and
performance of its obligations under, this Agreement will not result in the
breach or violation of applicable law or any agreement to which it is a party.


                                        2
<PAGE>   3



         1.       MISCELLANEOUS.

                  1. Effective Date. This Agreement shall be effective as of the
effective date specified below, and it is expressly agreed to by Consultant and
the Company that all the provisions hereof shall apply as if this Agreement had
been entered into on such date.

                  2. Survival of Terms. The provisions of paragraphs 4, 5 and 6
hereof shall survive termination of this Agreement.

                  3. Successors and Assigns. This Agreement may not be assigned
by Consultant without the written consent of the Company. This Agreement shall
be binding on all of Consultant's Associates, all of Consultant's heirs,
executors, administrators and legal representatives, and all of Consultant's
successors in interest and assigns, and shall be for the benefit of the Company,
its successors and its assigns.

                  4. Governing Law. This Agreement shall be governed by and
construed and enforced in accordance with the laws of the State of Texas as they
apply to contracts entered into and wholly to be performed in Texas.

                  5. Severability. If one or more of the provisions in this
Agreement are deemed void by law, then the remaining provisions will continue in
full force and effect.

                  6. Amendment. Neither this Agreement nor the Description of
Work may be amended except by a written agreement modifying the appropriate
document duly executed by Consultant and an officer of the Company.

                  7. Entire Agreement. This Agreement, together with the
Description of Work attached hereto and any other confidentiality agreement
previously or subsequently entered into by the Company and Consultant,
constitutes the sole and complete agreement of the parties with respect to the
matters included herein, and supersedes any previous oral or written agreement,
if any, relating to the subject matters included herein.

                  8. No Conflict. Consultant represents and warrants that this
Agreement does not conflict with any other agreement or term of employment
applicable to or binding upon the Consultant as of the date hereof and that
Consultant will promptly notify the Company in the event that any such conflict
does arise during the term hereof.

                  9. Construction. Each party to this Agreement has had the
opportunity to review this Agreement with legal counsel. This Agreement shall
not be construed or interpreted against any party on the basis that such party
drafted or authored a particular provision, parts of or the entirety of this
Agreement.

                                        3
<PAGE>   4
         IN WITNESS WHEREOF, this Agreement has been executed on the date set
forth below, and shall be effective as of the date specified.


CONSULTANT:                             COMPANY:

JAMES R. BUTLER                         ARONEX PHARMACEUTICALS, INC.


By:   /s/ JAMES R. BUTLER               By:    /s/ GEOFFREY F. COX, PH.D.
      ---------------------------            --------------------------------
Name: James R. Butler                   Name:  Geoffrey F. Cox, Ph.D.
      ---------------------------            --------------------------------
                                        Title: CEO
                                              -------------------------------
Date: SEPTEMBER 23, 1999                Date:  SEPTEMBER 21, 1999
      ---------------------------            --------------------------------

Effective Date: October 1, 1999


                                       4
<PAGE>   5


                                    EXHIBIT A

                          ARONEX PHARMACEUTICALS, INC.

                               DESCRIPTION OF WORK


                  (CONSULTING AGREEMENT DATED OCTOBER 1, 1999)

1.       DETAILED DESCRIPTION OF WORK:

         Consultant will perform work under this Agreement regarding sales and
marketing assistance, as may be mutually agreed, from time to time, between the
Company and Consultant. Consultant will provide at least 20 days of sales
consulting services per year. The specific terms of such projects, including the
detailed description of the work to be performed and the completion date of any
project, if any, shall be required to be set forth in writing, in which case
such terms shall constitute an addendum to this Agreement.

2.       START DATE: October 1, 1999

         COMPLETION DATE: Automatically renew upon anniversary date for
successive one year terms unless 30 days' advance written notice is given.

3.       PERSON(S) WHO ARE TO PERFORM THE WORK:

         James R. Butler

4.       AUTHORIZED REPRESENTATIVE OF THE COMPANY:

         The character of Consultant's services shall be subject to the
assignment and direction of Geoffrey Cox, Ph.D., who will be designated as the
"Director." Further, the character and scope of Consultant's services may be
revised by mutual agreement between Consultant and the Company and such revision
will be evidenced by a formal bilateral modification to the Consulting Agreement
or this Description of Work signed between Consultant and an authorized officer
of the Company. The Director and the Chief Executive Officer of the Company
shall be the only individuals authorized to designate any project to be covered
by this Agreement, sign any modification or addendum to this Agreement or the
Description of Work, and direct the activities of Consultant under this
Agreement.

5.       SCHEDULE PERFORMANCE:

         If at any time during the performance of this contract any phase of the
required tasks appear to be impossible of execution or if any phase cannot be
completed on schedule, it is agreed that Consultant will notify the Company
within one (1) day of such determination. At the time of such notification
Consultant shall explain to the Company why a particular task is impossible to
complete and propose alternative procedures for achieving the desired result.

6.       REPORT SCHEDULE:

         Reports, if any, to be as specified in an addendum to this Agreement.

7.       PAYMENT:


                                       5
<PAGE>   6


         As consideration for all services to be rendered and performed under
this Agreement and for assigning the rights to inventions, designs, patents,
trademarks, and copyrights as provided in the Consulting Agreement, Consultant
will be paid a consulting fee of $2,500.00 per month, 50% payable in Aronex
Pharmaceuticals, Inc. common stock and 50% in cash. The cash will be paid on a
monthly basis and the stock will be issued quarterly. The number of shares of
Common Stock to be granted shall be determined by reference to the fair market
value of the Common Stock as of the first day of each month.

8.       EXPENSES:

         The Company agrees to reimburse Consultant for the following expenses
incurred in connection with the performance of Consultant?s services under this
Agreement:


<TABLE>
<CAPTION>
                                                                 Yes       No
                                                                 ---       --
<S>                <C>                                           <C>       <C>
          -        Routine out-of-pocket expense                  X
          -        Local travel                                   X
          -        Long distance travel at the direction          X
                   of the Director or President
          -        Other - as approved in advance                 X
</TABLE>

CONSULTANT:                            COMPANY:

JAMES R. BUTLER                        ARONEX PHARMACEUTICALS, INC.


By: /s/ JAMES R. BUTLER                By: /s/ GEOFFREY F. COX
   -------------------------              ------------------------------
Name: James R. Butler                  Name:  Geoffrey F. Cox, Ph.D.
     -----------------------                ----------------------------
                                       Title:   CEO
                                             ---------------------------
Date: September 23, 1999               Date:    September 21, 1999
     -----------------------                ----------------------------



                                       6



<PAGE>   1
                                                                    EXHIBIT 10.3

                              CONSULTING AGREEMENT


         This CONSULTING AGREEMENT (this "Agreement") is entered into as of the
effective date specified below by and between ARONEX PHARMACEUTICALS, INC., a
Delaware corporation (the "Company"), and the undersigned consultant whose name
and address appear below ("Consultant"). The Company and Consultant hereby agree
as follows:

         1. CONSULTING SERVICES. Consultant is hereby engaged by the Company as
an independent contractor, and not as an employee, to carry out the project
specified in the Description of Work attached hereto as Exhibit A, on the terms
and conditions set forth in such Description of Work.

         2. TERM. This Agreement shall commence on October 1, 1999 and shall
automatically renew for successive one year periods. This Agreement may be
terminated by Consultant or Company, with or without "cause" (as defined below),
by giving 30 days' advance written notice thereof to the other party hereto. In
addition, this Agreement may be terminated by the Company immediately for
"cause." For purposes of this Agreement, "cause" shall be deemed to exist for
termination of this Agreement by the Company in the event (i) Consultant is not
performing in compliance with the Description of Work, (ii) Consultant has
engaged in personal conduct which (in the good faith determination of the
Company) would materially injure the goodwill or reputation of the Company or
otherwise materially adversely affect the interests of the Company or (iii) of
any breach by Consultant of the obligations contained in this Agreement or any
other agreement between the Company and Consultant.

         In the event of any termination of this Agreement prior to completion
of the term of this Agreement pursuant to the above provisions (whether with or
without "cause"), the Company's sole liability thereupon will be to pay
Consultant any unpaid balance due for work performed up to and including the
date of termination, if applicable.

         3. INDEPENDENT CONTRACTOR. It is agreed that Consultant's services are
made available to the Company on the basis that Consultant will retain
Consultant's individual professional status and that Consultant's relationship
with the Company is that of an independent contractor and not that of an
employee. Consultant will not be eligible for any employee benefits, nor will
the Company make deductions from its fees to Consultant for taxes, insurance,
bonds or any other subscription of any kind. Consultant will use Consultant's
own discretion in performing the tasks assigned, within the scope of work
specified by the Company. Consultant agrees to indemnify and hold the Company
harmless from and against any claim made by any third party against the Company
based in whole or in part upon any action by Consultant or any of Consultant's
employees, associates, consultants, agents, representatives, assignees or
successors in interest (collectively, "Consultant's Associates"), which occurs
pursuant to or in connection with this Agreement or the relationship or
relationships contemplated by this Agreement.

         4. CONFIDENTIAL INFORMATION. Consultant agrees that Consultant, and all
of Consultant's Associates, shall keep in strictest confidence all information
relating to the products, materials, programs, algorithms, designs, trade
secrets, secret processes, customers and markets of the Company and all other
confidential knowledge, data and information related to the business or affairs
of the Company (collectively, "Confidential Information") that may be acquired
pursuant to or in connection with this Agreement or the relationship or
relationships contemplated by this Agreement. During and after the term of this
Agreement, neither Consultant nor any of Consultant's Associates will, without
the prior written consent of an officer of the Company, publish, communicate,
disclose or use for any purpose any of such Confidential Information. Upon
termination of this Agreement, Consultant will return to the Company all
records, data, notes, reports, printouts, sketches, material, equipment and
other documents or property, and all


                                       1
<PAGE>   2


reproductions of any of the foregoing, furnished by the Company or developed or
prepared pursuant to the relationship hereunder.

         Notwithstanding the foregoing, it is agreed that Confidential
Information shall not include any (i) information which is or becomes through no
fault of Consultant or any of Consultant's Associates generally known to the
public, and (ii) Consultant's and Consultant's Associates' skill, knowledge,
know-how and experience.

         5. ASSIGNMENT OF INTELLECTUAL PROPERTY. Consultant agrees to transfer
and assign and hereby does transfer and assign to the Company the entire right,
title and interest for the entire world in and to all data, materials, software,
designs, models, algorithms, writings, drawings, notebooks, documents,
photographs, inventions and discoveries (collectively, "Inventions") made or
conceived or reduced to practice by Consultant or any of Consultant's Associates
(i) in the course of accomplishing the work described on the Description of Work
attached as Exhibit A hereto, (ii) in the course of accomplishing other work
performed pursuant to the relationship established by this Agreement, or (iii)
with the use of materials or facilities of the Company.

         Consultant agrees that Consultant and each of Consultant's Associates
will sign, execute and acknowledge, or cause to be signed, executed and
acknowledged, at the expense of the Company, any and all documents, and will
perform any and all acts, as may be necessary, useful or convenient for the
purpose of securing to the Company or its nominee patent, trademark or copyright
protection throughout the world upon all such Inventions. At the request of the
Company, Consultant will have each of Consultant's Associates with access to
Confidential Information of the Company or who performs work pursuant to this
Agreement to sign an agreement in form substantially identical to this
Agreement.

         6. LICENSE RIGHTS. In the event that Consultant recommends to the
Company that the Company make use of devices and/or processes covered by patents
and/or patent applications which Consultant may own or control, Consultant will
then so inform the Company, and in the event that the Company shall follow
Consultant's recommendation and Consultant has the right to grant a license
under such patents and/or patent applications, then Consultant will grant to the
Company a license on reasonable terms which are no less favorable than those
granted by Consultant to any other licensee.

         7. REPRESENTATIONS OF CONSULTANT AND THE COMPANY.

                  1. Consultant represents and warrants to the Company that (i)
this Agreement is a valid and binding obligation of Consultant, enforceable
against Consultant in accordance with its terms, and (ii) his execution and
delivery of, and performance of his services and other obligations under, this
Agreement will not result in the breach or violation of applicable law or any
agreement to which he is a party.

                  2. The Company represents and warrants to Consultant that (i)
this Agreement has been duly and validly authorized by the Company and is a
valid and binding obligation of the Company, enforceable against the Company in
accordance with its terms, and (ii) its execution and delivery of, and
performance of its obligations under, this Agreement will not result in the
breach or violation of applicable law or any agreement to which it is a party.


                                       2
<PAGE>   3


         8.       MISCELLANEOUS.

                  1. Effective Date. This Agreement shall be effective as of the
effective date specified below, and it is expressly agreed to by Consultant and
the Company that all the provisions hereof shall apply as if this Agreement had
been entered into on such date.

                  2. Survival of Terms. The provisions of paragraphs 4, 5 and 6
hereof shall survive termination of this Agreement.

                  3. Successors and Assigns. This Agreement may not be assigned
by Consultant without the written consent of the Company. This Agreement shall
be binding on all of Consultant's Associates, all of Consultant's heirs,
executors, administrators and legal representatives, and all of Consultant's
successors in interest and assigns, and shall be for the benefit of the Company,
its successors and its assigns.

                  4. Governing Law. This Agreement shall be governed by and
construed and enforced in accordance with the laws of the State of Texas as they
apply to contracts entered into and wholly to be performed in Texas.

                  5. Severability. If one or more of the provisions in this
Agreement are deemed void by law, then the remaining provisions will continue in
full force and effect.

                  6. Amendment. Neither this Agreement nor the Description of
Work may be amended except by a written agreement modifying the appropriate
document duly executed by Consultant and an officer of the Company.

                  7. Entire Agreement. This Agreement, together with the
Description of Work attached hereto and any other confidentiality agreement
previously or subsequently entered into by the Company and Consultant,
constitutes the sole and complete agreement of the parties with respect to the
matters included herein, and supersedes any previous oral or written agreement,
if any, relating to the subject matters included herein.

                  8. No Conflict. Consultant represents and warrants that this
Agreement does not conflict with any other agreement or term of employment
applicable to or binding upon the Consultant as of the date hereof and that
Consultant will promptly notify the Company in the event that any such conflict
does arise during the term hereof.

                  9. Construction. Each party to this Agreement has had the
opportunity to review this Agreement with legal counsel. This Agreement shall
not be construed or interpreted against any party on the basis that such party
drafted or authored a particular provision, parts of or the entirety of this
Agreement.



                                       3
<PAGE>   4





         IN WITNESS WHEREOF, this Agreement has been executed on the date set
forth below, and shall be effective as of the date specified.

CONSULTANT:                               COMPANY:

DAVID J. MCLACHLAN                        ARONEX PHARMACEUTICALS, INC.


By:   /s/ DAVID J. MCLACHLAN              By:    /s/ GEOFFREY F. COX, PH.D.
   ---------------------------------         --------------------------------
Name: David J. McLachlan                  Name:  Geoffrey F. Cox, Ph.D.
     -------------------------------           ------------------------------
                                          Title: CEO
                                                -----------------------------
Date: September 30, 1999                  Date:  September 28, 1999
     -------------------------------           ------------------------------

Effective Date: October 1, 1999






                                       4
<PAGE>   5
                                    EXHIBIT A

                          ARONEX PHARMACEUTICALS, INC.

                               DESCRIPTION OF WORK

                  (CONSULTING AGREEMENT DATED OCTOBER 1, 1999)


1.       DETAILED DESCRIPTION OF WORK:

         Consultant will perform work under this Agreement regarding accounting
and financial matters, as may be mutually agreed, from time to time, between the
Company and Consultant. Consultant will provide at least 20 days of consulting
services per year. The specific terms of such projects, including the detailed
description of the work to be performed and the completion date of any project,
if any, shall be required to be set forth in writing, in which case such terms
shall constitute an addendum to this Agreement.

2.       START DATE: October 1, 1999

         COMPLETION DATE: Automatically renew upon anniversary date for
successive one year terms unless 30 days' advance written notice is given.

3.       PERSON(S) WHO ARE TO PERFORM THE WORK:

         David J. McLachlan

4.       AUTHORIZED REPRESENTATIVE OF THE COMPANY:

         The character of Consultant's services shall be subject to the
assignment and direction of Geoffrey Cox, Ph.D., who will be designated as the
"Director." Further, the character and scope of Consultant's services may be
revised by mutual agreement between Consultant and the Company and such revision
will be evidenced by a formal bilateral modification to the Consulting Agreement
or this Description of Work signed between Consultant and an authorized officer
of the Company. The Director and the Chief Executive Officer of the Company
shall be the only individuals authorized to designate any project to be covered
by this Agreement, sign any modification or addendum to this Agreement or the
Description of Work, and direct the activities of Consultant under this
Agreement.

5.       SCHEDULE PERFORMANCE:

         If at any time during the performance of this contract any phase of the
required tasks appear to be impossible of execution or if any phase cannot be
completed on schedule, it is agreed that Consultant will notify the Company
within one (1) day of such determination. At the time of such notification
Consultant shall explain to the Company why a particular task is impossible to
complete and propose alternative procedures for achieving the desired result.

6.       REPORT SCHEDULE:

         Reports, if any, to be as specified in an addendum to this Agreement.

7.       PAYMENT:


                                       5
<PAGE>   6


         As consideration for all services to be rendered and performed under
this Agreement and for assigning the rights to inventions, designs, patents,
trademarks, and copyrights as provided in the Consulting Agreement, Consultant
will be paid a consulting fee of $2,500.00 per month, 50% payable in Aronex
Pharmaceuticals, Inc. common stock and 50% in cash. The cash will be paid on a
monthly basis and the stock will be issued quarterly. The number of shares of
Common Stock to be granted shall be determined by reference to the fair market
value of the Common Stock as of the first day of each month.

8.       EXPENSES:

         The Company agrees to reimburse Consultant for the following expenses
incurred in connection with the performance of Consultant's services under this
Agreement:


<TABLE>
<CAPTION>
                                                                 Yes       No
                                                                 ---       --
<S>                <C>                                           <C>       <C>
          -        Routine out-of-pocket expense                  X
          -        Local travel                                   X
          -        Long distance travel at the direction          X
                   of the Director or President
          -        Other - as approved in advance                 X
</TABLE>

CONSULTANT:                            COMPANY:

DAVID J. MCLACHLAN                     ARONEX PHARMACEUTICALS, INC.


By: /s/ David J. McLachlan             By: /s/ Geoffrey F. Cox
   -------------------------              ------------------------------
Name: David J. McLachlan               Name:  Geoffrey F. Cox, Ph.D.
     -----------------------                ----------------------------
                                       Title:   CEO
                                             ---------------------------
Date: September 30, 1999               Date: September 28, 1999
     -----------------------                ----------------------------


                                       6


<PAGE>   1
                                                                    EXHIBIT 11.1

                  ARONEX PHARMACEUTICALS, INC. AND SUBSIDIARIES


             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>
                                                                                                                            INCOME
                                                                                              AVERAGE                       (LOSS)
                                                             DAYS                              SHARES         INCOME         PER
                                            SHARES        OUTSTANDING  SHARES X  DAYS       OUTSTANDING       (LOSS)        SHARE
<S>                                         <C>           <C>          <C>                  <C>               <C>           <C>
NINE MONTHS ENDED SEPTEMBER 30, 1998:
                                            15,459,166        11          170,050,826
                                            15,460,684        71        1,097,708,564
                                            15,465,729         1           15,465,729
                                            15,467,281        98        1,515,793,538
                                            15,497,443        92        1,425,764,756
                                            15,503,745         1           15,503,745
                                                              274       4,240,287,158  /274  15,475,501      (16,546,000)    (1.07)


NINE MONTHS ENDED SEPTEMBER 30, 1999:       16,379,309         3           49,137,927
                                            16,415,664        50          820,783,200
                                            22,415,664        14          313,819,296
                                            22,463,211        21          471,727,431
                                            22,474,987         1           22,474,987
                                            22,494,671         1           22,494,671
                                            22,495,050        64        1,439,683,200
                                            22,496,505        26          584,909,130
                                            22,555,435         1           22,555,435
                                            22,555,977         8          180,447,816
                                            22,560,179        27          609,124,833
                                            22,697,866        20          453,957,320
                                            22,719,999         6          136,319,994
                                            22,723,765         3           68,171,295
                                            22,723,927        13          294,411,051
                                            22,773,927         5          113,869,635
                                            22,775,753         9          204,981,777
                                            22,788,071         1           22,788,071
                                                              273       5,832,657,069  /273  21,365,044       (7,305,000)    (0.34)



QUARTER ENDED SEPTEMBER 30, 1998:
                                            15,497,443        91        1,410,267,313
                                            15,503,745         1           15,503,745
                                                              92        1,425,771,058   /92  15,497,512       (6,059,000)    (0.39)




QUARTER ENDED SEPTEMBER 30, 1999:           22,555,977         8          180,447,816
                                            22,560,179        27          609,124,833
                                            22,697,866        20          453,957,320
                                            22,719,999         6          136,319,994
                                            22,723,765         3           68,171,295
                                            22,723,927        13          295,411,051
                                            22,723,927         5          113,869,635
                                            22,775,753         9          204,981,777
                                            22,788,071         1           22,788,071
                                                              92        2,085,071,792   /92  22,663,824       (5,399,000)    (0.24)
</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 NINE MONTHS ENDED SEPTEMBER 30, 1999 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>

<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               SEP-30-1999
<CASH>                                      15,884,000
<SECURITIES>                                 8,442,000
<RECEIVABLES>                                  857,000
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                            24,823,000
<PP&E>                                       5,445,000
<DEPRECIATION>                               3,319,000
<TOTAL-ASSETS>                              27,876,000
<CURRENT-LIABILITIES>                        4,354,000
<BONDS>                                              0
                                0
                                          0
<COMMON>                                        23,000
<OTHER-SE>                                  19,881,000
<TOTAL-LIABILITY-AND-EQUITY>                27,876,000
<SALES>                                              0
<TOTAL-REVENUES>                            11,757,000
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                            18,805,000
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             257,000
<INCOME-PRETAX>                            (7,305,000)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (7,305,000)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (7,305,000)
<EPS-BASIC>                                     (0.34)
<EPS-DILUTED>                                   (0.34)


</TABLE>


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