- Concurrent active malignancy other than non melanoma skin cancers or carcinoma in situ of the cervix. Patients with previous malignancies, but which have not required anti tumor treatment within the preceding 24 months will be allowed to enter the trial. Patients with a history of a T1a or b prostate cancer (detected incidentally at TURP and comprising less than 5% of resected tissue) may participate if the PSA has remained within normal limits since TURP.