1Department of Pathology, Osaka University Medical School, Kita-Ku, Osaka, 530, Japan
2Department of Urology, Osaka University Medical School, Kita-ku, Osaka 530 Japan
3Shionogi Research Laboratory, Fukushima-ku, Osaka 553, Japan
4Department of Internal Medicine, Osaka University Medical School, Kita-ku, Osaka 530 Japan