[Clinicopathological study of latent carcinoma--with special reference to prostatic cancer]

At routine examination, latent carcinoma was found in 147 (11.4%) of 1291 autopsy cases and 142 (14.5%) of 981 patients with malignant neoplasms. The incidence of latent carcinoma with multiple malignant neoplasma was extremely high. Latent prostatic cancer was found in 24 (4.3%) of 560 autopsy cases aged more than 45 and in 22 (5.3%) of 425 surgical specimens of prostatic hypertrophy. Malignant and nonmalignant tissue of the prostate was stained by the immunoperoxidase method of PSA and PAcP. We can distinguish between cancer and normal or benign tissue by observing the positive portion and stained manner in detail.