PRESENT STATE OF EARLY COLORECTAL CANCER

Abstract

422 cases of early colorectal cancers were analyzed clinicopathologically, and Japanese problems on this disease were discussed. We encountered a total of 104 cases of depressed type neoplastic lesions including 27 cases of early cancer and 77 cases of adenoma. According to our cases excised on endoscopy, depressed neoplastic lesion includes more adenoma than cancer. It is necessary for us to know that there are a lot of cancers in depressed neoplastic lesions and that there exist several times more adenomas in the large intestine. Cases of protruded type (Ip, Isp, Is) early cancer occupied 83.4% of all early cancers (352/422). When we think of the size of early colorectal cancer, the diameter of 6mm is regarded as a figure of prime importance. As for protruded type early cancers of 6 to 10mm in diameter, 25.9% of this lesion is sm cancer. Furthermore 35% of this sm cancer shows sm massive invasion. In view of our results, we think that a neoplastic lesion of 6 mm and over in diameter should be endoscopically resected irrespective of the types of lesions, protruded or depressed.