Cohort A (closed to accrual as of 3/2/04)*: Patients receive escalating doses of gemcitabine hydrochloride intravenously (IV) over 30 minutes, tanespimycin IV over 1 hour, and cisplatin IV over 2 hours on days 1 and 8. NOTE: *The maximum tolerated dose (MTD) of this 3-drug combination has been determined as of 3/2/04.