Simultaneous administration of pure antiandrogens, a combination necessary for the use of luteinizing hormone-releasing hormone agonists in the treatment of prostate cancer.

Abstract
Although castration levels of serum androgens are consistently achieved after 2-3 wk of treatment with LHRH agonists [Buserelin] the administration of these peptides alone in adult men is always accompanied by a transient increase in plasma testosterone and dihydrotestosterone levels, which lasts for 5-15 days at the beginning of treatment and is accompanied by disease flare-up in some cases, thus seriously limiting the acceptability of this otherwise efficient and well tolerated treatment. The simultaneous administration of a pure antiandrogen [Anandron] neutralizes the influence of the transient increase in serum androgens on prostate cancer, as indicated by the 60% decrease in serum prostatic acid phosphatase observed within 5 days of combined treatment with a LHRH agonist and a pure antiandrogen. The addition of pure antiandrogen thus makes fully acceptable the use of LHRH agonists as an advantageous substitute for surgical castration and estrogens in the treatment of prostate cancer.