OUTLINE: This is a dose escalation study of green tea extract. Patients receive green tea extract by mouth daily after meals for 4 weeks. One patient is entered at each dose level. If grade II toxicities are experienced, then 2 more patients are entered at the same dose level. One patient must complete 4 weeks of therapy and 2 others must complete 2 weeks of therapy with no greater than grade I toxicity before dose escalation proceeds. If at least 2 patients experience dose limiting toxicity at any dose level, the immediately preceding dose level is considered the maximum tolerated dose (MTD). At least 6 patients are studied at the MTD. Patients may continue therapy for up to 6 months in the absence of toxicity and disease progression. Patients are followed every 4 weeks for the duration of treatment and at least one month after completing treatment.