<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 JUNE 30, 2000 AND IS QUALIFIED IN ITS
ENTIRE BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> JUN-30-2000
<CASH> 14,613,000
<SECURITIES> 2,468,000
<RECEIVABLES> 0
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 16,489,000
<PP&E> 5,559,000
<DEPRECIATION> 3,758,000
<TOTAL-ASSETS> 19,201,000
<CURRENT-LIABILITIES> 3,463,000
<BONDS> 0
26,000
0
<COMMON> 0
<OTHER-SE> 12,347,000
<TOTAL-LIABILITY-AND-EQUITY> 19,201,000
<SALES> 0
<TOTAL-REVENUES> 286,000
<CGS> 0
<TOTAL-COSTS> 0
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 116,000
<INCOME-PRETAX> (4,466,000)
<INCOME-TAX> 0
<INCOME-CONTINUING> (4,466,000)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (4,466,000)
<EPS-BASIC> (0.18)
<EPS-DILUTED> (0.18)
</TABLE>