<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 THREE MONTHS ENDED SEPTEMBER 30, 2000 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> SEP-30-2000
<CASH> 11,924,000
<SECURITIES> 0
<RECEIVABLES> 0
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 12,216,000
<PP&E> 5,871,000
<DEPRECIATION> 3,887,000
<TOTAL-ASSETS> 15,071,000
<CURRENT-LIABILITIES> 3,405,000
<BONDS> 0
0
0
<COMMON> 26,000
<OTHER-SE> 3,378,000
<TOTAL-LIABILITY-AND-EQUITY> 15,071,000
<SALES> 0
<TOTAL-REVENUES> 296,000
<CGS> 0
<TOTAL-COSTS> 0
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 131,000
<INCOME-PRETAX> (4,131,000)
<INCOME-TAX> 0
<INCOME-CONTINUING> (4,131,000)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (4,131,000)
<EPS-BASIC> (0.16)
<EPS-DILUTED> (0.16)
</TABLE>