Management of bicalutamide induced gynaecomastia. A randomized study comparing therapy versus prophylaxis with tamoxifen.

Introduction and Objective: Gynaecomastia is a potentially treatment limiting adverse event of antiandrogen monotherapy for prostate cancer. Tamoxifen has shown to be effective in therapy and prophylaxis of gynecomastia and breast pain. However, tamoxifene dosage and treatment duration are not established and debate still exists if prophylaxis is more effective than therapy at the early onset. This randomized study compared the prophylactic activity of tamoxifene at the dose of 10 mg with its therapeutic activity when given at the dose of 20 mg at the early appearance of gynecomastia in patients receiving bicalutamide 150 mg/d for prostate cancer. Methods: Between June 2005 and June 2007, 1…