ABSTRACT
Objective To study the clinicopathological characteristics of hereditary nonpolyposis colorectal cancer (HNPCC) in Chinese population with different criteria and guidelines. Methods Twenty four families fulfilling Amsterdam Criteria (AC), 15 additional families fulfilling Japanese Criteria (JC) and the remaining 19 patients fitting Bethesda Guidelines (BG) were analyzed. Results In the 24 AC families there were 116 malignant tumor patients including 90 colorectal cancer (CRC) subjects and in the 15 JC families there were 54 malignant tumor patients including 33 CRC cases. The two groups displayed similar clinical features. Mean age of first CRC at diagnosis was 46.1 and 51.4 years old, respectively. The proximal colonic cancers accounted for 55.4% versus 44.8%. Synchronous and metachronous multiple CRCs occurred in 25.6% and 18.2% of patients respectively. Totally there were 55 extracolonic tumors in the two groups. Gastric and endometrial carcinomas were two most common extracolonic tumor types in our series. The tumors of the 34 probands showed more frequent exophytic growth pattern, higher occurance of poorly differentiated carcinoma, A / B Dukes stage and more Crohn's like lymphoid reaction ( P