Characteristics of hereditary nonpolyposis colorectal cancer among Chinese patients / 中华消化杂志

ABSTRACT

Objective To study the clinical characteristics of hereditary nonpolyposis colorectal cancer (HNPCC) in Chinese patients. Methods A series of 101 patients with colorectal cancers (CRC) and HNPCC associated tumors from 22 families fulfilling Amsterdam criteria were analyzed. Results Eighty-four patients were found to have CRC. Mean age at diagnosis of first CRC was 45.7 years. 58.3% and 23.8% of the first CRC were located proximal to the spleen flexure and in rectum respectively. 23.8% of patients had synchronous and metachronous CRC. Twenty patients had extracolonic tumors, among which gastric cancer was the most common tumor type in our series. Conclusions The frequency of HNPCC was 2.6% in this series of patients. It is characterized by early onset with a propensity to involve the proximal colon, and high frequency of multiplicity. Gastric cancer seems more frequent in Chinese patients, which is different from American and European reports. So it is necessary to set up criteria for diagnosis of HNPCC in Chinese.