Twenty-one patients with stage T3 cancer of the prostate underwent complete androgen deprivation (LH-RH agonist and flutamide) for 3 months prior to radical prostatectomy. Two problems were to be dealt with: the decrease in the volume of the prostate, and the possibility of downstaging (= pT less than pT3 according to the UICC 1987 classification) of the prostatic cancer. A decrease in the volume was noted in each case. A downstaging effect (pT in comparison to T stage) was noted in 33% of the patients. The downstaging effect was noted in 75% of grade 1 tumor, in 31% of grade 2 tumors, but not in grade 3 tumors.