AR and benign prostatic hyperplasia: We have developed a 2-step strategy that included: 1/ preselection, by microarrays, of androgen-regulated genes in an immortalized prostate cell line (RWPE-1) stably overexpressing AR, and 2/ distinction between those differentially expressed in PCa and androgen-regulated reference tissues infrequently prone to give rise to PCa (transition zone, BPH and seminal vesicle).