Short-term versus long-term addition of cyproterone acetate to buserelin therapy in comparison with orchidectomy in the treatment of metastatic prostate cancer. European Organization for Research and Treatment of Cancer--Genitourinary Group.

In an open, multicenter, three-armed, randomized study, we compared the effects of short-term (2 weeks) and continuous addition of the antiandrogen cyproterone acetate to the luteinizing hormone-releasing hormone agonist buserelin to those of orchidectomy in patients with advanced prostate cancer. No significant differences among the three treatment arms with respect to response rate, subjective response, time-to-progression, overall survival, and cancer deaths were observed. It was concluded that the short-term or continuous addition of cyproterone acetate to buserelin administered intranasally did not improve treatment results compared to orchidectomy only.