Hahn et al. [12] showed that the perioperative administration of dutasteride had no effects on microvessel density (MVD) in prostatic tissue of BPH patients given pre-operative dutasteride for 2 or 4 weeks compared with placebo controls in a prospective, randomized, and multicenter study, where MVD was counted by the number of microvessels immunostained with anti-CD34 antibody within an area of 0.754 mm2 of a resected chip. The gene discussed is CD34; the disease is benign prostatic hyperplasia.