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[Hereditary nonpolyposis colorectal cancer]
1Department of Molecular Oncology, Tokyo Medical and Dental University.
Nihon Rinsho. Japanese Journal of Clinical Medicine
|August 2, 2000
Summary
Hereditary nonpolyposis colorectal cancer (HNPCC) is linked to mismatch repair gene mutations. The study found hMSH2 mutations more frequently than hMLH1, with TGF-beta RII alterations associated with early adenoma formation in HNPCC.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- Hereditary nonpolyposis colorectal cancer (HNPCC) is a significant genetic predisposition syndrome.
- Key causative genes for HNPCC include mismatch repair genes like hMSH2 and hMLH1.
Purpose of the Study:
- To investigate the mutation rates of hMLH1 and hMSH2 in HNPCC patients.
- To assess the association of TGF-beta RII alterations with adenoma and cancer development in HNPCC.
Main Methods:
- Polymerase chain reaction-single-strand conformation polymorphism (PCR-SSCP) was used to screen for germline mutations in hMLH1 and hMSH2.
- Analysis of TGF-beta RII alterations in adenomas and cancers from HNPCC patients.
Main Results:
- Germline mutations were detected in 60% of HNPCC cases meeting Amsterdam criteria and 13.6% meeting Japanese clinical criteria.
- hMSH2 mutations were significantly more frequent (11/12) than hMLH1 mutations (1/12).
- TGF-beta RII alterations were found in 57% of adenomas and 85% of cancers, appearing early in adenoma development.
Conclusions:
- Germline mutations in mismatch repair genes are crucial in HNPCC pathogenesis.
- hMSH2 appears to be a more frequently mutated gene than hMLH1 in this HNPCC cohort.
- TGF-beta RII alterations are strongly associated with early adenoma formation in HNPCC, suggesting a role in tumorigenesis.