Clinical and genetic features of International Collaborative Group-hereditary nonpolyposis colorectal cancer families and suspected hereditary nonpolyposis colorectal cancer families.
BACKGROUND
Hereditary nonpolyposis colorectal cancer (HNPPC) is one of the most common genetic syndrome related with mutation of human mismatch repair genes. This study was to evaluate the clinical significance of suspected hereditary nonpolyposis colorectal cancer (sHNPCC) criteria I and the clinical and genetic features of International Collaborative Group-HNPCC (ICG-HNPCC) and sHNPCC families.


METHODS
Twenty-nine ICG-HNPCC families fulfilling the Amsterdam criteria and 34 sHNPCC families fulfilling the sHNPCC criteria I were collected. PCR-SSCP and DNA sequencing analysis were employed to screen the germline mutations of the hMLH1 and hMSH2 genes in these families.


RESULTS
The ICG group had more colorectal cancer (CRC) patients per family than did the suspected group (P < 0.05). No statistical difference was observed in Lynch classification and familial tumor spectrum. In both groups of families, colorectal cancer was the most frequent malignancy, and carcinomas of the stomach, pancreas and uterus were the three most common extracolonic malignancies. Mutation screening showed that ICG-HNPCC and sHNPCC families had a similar mutation rate (31.0% vs 29.4%, P > 0.05), mutation type, and mutation distribution. Comparison of the families with and without mutation showed no significant difference in CRC patients per family, Lynch classification, and tumor spectrum.


CONCLUSIONS
ICG-HNPCC and sHNPCC families that have similar clinical manifestations and genetic basis indicate a similar nature for cancer development. The application of sHNPCC criteria I will facilitate clinical diagnosis and treatment of small families.
Yuan
Ying
Y
Cancer Research Institute, Zhejiang University, Hangzhou 310009, China.
Ye
Jun
J
Zheng
Shu
S
D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D003123:Colorectal Neoplasms, Hereditary Nonpolyposis / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics; D006801:Humans; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein; D009154:Mutation; D009363:Neoplasm Proteins / Q000235:genetics; D009687:Nuclear Proteins; D016133:Polymerase Chain Reaction; D018807:Polymorphism, Single-Stranded Conformational; D011518:Proto-Oncogene Proteins / Q000235:genetics
D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; C501486:MLH1 protein, human; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins; C497172:MSH2 protein, human; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein