Abstract
A ratio of various epithelial tumors at the five segments of the large intestine (rectum, sigmoid c., descending c., transverse c. and ascending colon) war studied. At the rectum, the ratio of advanced cancer is the highest (36%) while that of adenoma is far lower. At the sigmoid colon the ratio of larger adenoma and early cancer is higher than that of smaller adenoma and advanced cancer. Early cancer is lower in ratio compared to the ratio of smaller adenoma and advanced cancer at the right colon. The reason of the segmental difference of each type of tumors were studied and the followings were hypoth-esized. (1) The growth pattern of tumor is not necessarily the same at segments of the large intestine. (2) Tumors of the rectum grow rapidly compared to those of other segments. (3) Some tumors of the right colon grow rapidly while most of them grow slowly.
