title: [Clinical and pathological analysis of 8 hereditary nonpolyposis colorectal cancer pedigrees].
abstract: OBJECTIVE
  To analyze the clinical and pathological features of patients with hereditary nonpolyposis colorectal cancer (HNPCC).
  
  
  METHODS
  The data of 8 HNPCC pedigrees according with Amsterdam standard II were collected and their pedigree trees were generated.
  
  
  RESULTS
  The morbidity of HNPCC was 1.59%. Thirty-one patients were found in the 8 HNPCC pedigrees including 25 with colorectal cancer and 6 with extraintestinal tumors. The 8 probands consisted of 6 female and 2 male patients, among whom 4 were younger than 40 years old, 2 had lesions in the right colon, 3 in the left colon, and 3 in the rectum. The tumors were histologically identified mainly as highly to moderately differentiated adenocarcinoma; all the patients were free of lymph node or distant metastasis. Of the 8 probands, 5 had abnormal expression of MMR protein and only 1 had normal expression.
  
  
  CONCLUSIONS
  The HNPCC probands are characterized by early onset at a young age and high differentiation of the tumor. The members of the pedigrees show a high incidence of the malignancies, and regular examination and timely treatment can be effective in preventing the tumor occurrence and reducing the mortality. Detection of MMR gene mutation can be a crucial approach to raising the diagnostic rate of HNPCC.
authors.affiliation: Department of Pathology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China. doctorwylh@163.com
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Yang
authors.forename: Yan-qing
authors.initials: YQ
authors.lastname: Ding
authors.forename: Jing
authors.initials: J
authors.lastname: Tong
mesh_terms: D000328:Adult; D000368:Aged; D003123:Colorectal Neoplasms, Hereditary Nonpolyposis / Q000235:genetics* / Q000473:pathology*; D053843:DNA Mismatch Repair / Q000235:genetics*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010375:Pedigree