Cohorts of 3-6 patients receive escalating doses of flavopiridol until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which at least 2 of 6 patients experience dose-limiting toxicity. Separate MTDs of flavopiridol are determined when flavopiridol is combined with 2 different doses of docetaxel. A total of 10 patients are treated at each flavopiridol MTD.