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ヒト前立腺肥大症の組織を上皮と間質に分離する方法を改良し, 上皮細胞は組織1 gあたり平均2千万個得, 95%以上の細胞に酸性フォスファテース活性のあることを組織化学的に証明した.間質は, 酸性フォスファテース活性が上皮に比べ, 単位蛋白あたり約1/10以下であった.また5α-リダクテースはほとんどが間質に存在し, 男性ホルモン受容体は, むしろ間質に多いとの結果を得た, An average of 20 X 10(6) nucleated cells were obtained from 1 g tissue of human benign prostatic hyperplasia by mechanical separation technique. Of these cells, 96.2% showed acid phosphatase activity and this was 10 times higher than the remaining stromal fraction on a protein base. The total activity of 5 alpha-reductase was 81 times higher in stroma than epithelium and the total activity of 3(beta)-oxidoreductase was 29 times higher in stroma. Androgen receptor amount measured in total tissue, epithelium and stroma were 100, 29 and 62 fmol R1881/mg DNA, respectively. These results suggest that androgen metabolism takes place mainly in the stroma of human BPH tissue, and that BPH is probably the disease of prostatic stroma.