33 patients were treated with a combination of tamoxifen and fluoxymesterone (10 mg t.i.d. each) after progression on prior hormonotherapy (HT). 6 of 22 patients (27%) exhibiting a partial response (PR) or stable disease (NC) on previous HT responded to the combination (median time to relapse 7 months, range 3.5 to 17+ months). 11 (50%) maintained NC (median duration 5 months, range 2% to 9.5 months). No response has been seen in 11 patients who experienced progressive disease during prior hormonal manipulation or who were not evaluable for response to prior HT. The overall response rate was 18% for the patient population as a whole (responders and nonresponders to previous HT), which most probably would be similar to the response rate if these patients received only fluoxymesterone.