 Patients receive 17-N-allylamino-17-demethoxygeldanamycin 17-AAG IV over 1 hour on days 1, 4, 8, and 11. Treatment repeats every 21 days for up to 8 courses in the absence of disease progression or unacceptable toxicity. Patients experiencing disease regression after completion of 8 courses may receive 2 additional courses of treatment beyond their maximal response. 