Beginning with the infusion level at which DLT is first encountered by a single patient, cohorts of 3-6 patients receive escalating doses of BMS-214662 until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which 2 of 3 or 2 of 6 patients experience DLT. An additional cohort of 10 patients is treated at the MTD.