- Patients with prostate cancer who have failed at least 1 course of an accepted hormonal therapy. Specifically prostate cancer patients must have castrate testosterone levels (< 50 ng/dl) and 2 PSA values higher than the previously documented baseline at least 3 weeks apart or evidence of increases in measurable disease. These patients may have received previous courses of cytotoxic chemotherapy although chemotherapy naïve patients who are deemed not good candidates or who have refused cytotoxic therapy will be eligible. These patients may remain on anti-androgen therapy during the trial. Patients with evidence of progressive bone or other metastases are acceptable.