Abstract
One hundred twenty-three cases of advanced colorectal cancers were classified into PG-Ca(intramucosal polypoid growth)and NPG-Ca(nonpolypoid growth). PG-Ca was 61 (49.6%)and NPG-Ca was 62 cases(50.4%). The mean age was 68.1±11.1years in PG-Ca and 60.3±11.6years in NPG-Ca. The average diameter of tumors was 5.7±2.7cm in PG-Ca and 4.3±2.1cm in NPG-Ca. Tumors less than 2 crn in size were 26.3%(5/19)in PG-Ca, and 73.7%(14/19)in NPG-Ca Tum.rs ranged fr.m 2.1 to5cm were 40.7%(22/54)in PG-Ca and 59.3%(32/54)in NPG-Ca. Tumors more than 5 cm were 68.0%(34/50) in PG-Ca and 32.0%(16/50)in NPG-Ca. Frequency of cancer with adenoma was 5.7%(7/123)of all cancers and 11%of PG-Ca. In small advanced cancers less than 2 cm in diameter, nave of case with adenoma was found. We conclude that NPG-Ca may be derived from nonpolypoid early cancer(flat type cancar) since there are different clinicopathological features between PG and NPG color-eCtal Cancers.
