3. Patients may have received an unlimited amount of prior therapy, including platinum-based therapy, but such therapies must be discontinued at least 3 weeks prior to entry on this study. At least two weeks must have elapsed from the completion of radiotherapy and the start of therapy and six weeks must have elapsed if the radiotherapy involved the whole pelvis or over 50% of the spine, provided the acute effects of radiation treatment have resolved. Hormonal therapy may be discontinued at any time prior to initiating the protocol.