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"hMLH1 and hMSH2 gene mutation in Brazilian families with suspected hereditary nonpolyposis colorectal cancer." |
Rossi BM, Lopes A, Oliveira Ferreira F, Nakagawa WT, Napoli Ferreira CC, Casali Da Rocha JC, Simpson CC, Simpson AJ |
Published July 1, 2002 in Ann Surg Oncol volume 9 .
Pubmed ID: 12095971
Abstract:
| BACKGROUND: The aim of this study was to search for mutations in the human mutS homolog 2 (hMSH2) and human mutL homolog 1 (hMLH1) genes in 25 unrelated Brazilian kindreds with suspected hereditary nonpolyposis colorectal cancer (HNPCC). METHODS: The families were grouped according to the following clinical criteria: Amsterdam I or II; familial colorectal cancer (CRC); an early age of onset of CRC in the proband only; or with at least one or two relatives who had HNPCC-related cancers; CRC in the proband only. All patients were studied with direct sequencing. RESULTS: Ten mutations were detected (10 of 25 [40%]); of nine different mutations, seven were novel. The hMLH1 gene had a higher mutation detection rate than hMSH2 (8 of 25 [32%] vs. 2 of 25 [8%]). Only 3 of these 10 families fulfilled the Amsterdam criteria. Two different polymorphisms were detected in the hMLH1 gene and four in the hMSH2 gene. CONCLUSIONS: The hMLH1 gene had a higher mutation detection rate than hMSH2. The physician who deals with CRC must take into consideration the heredity issue with patients who present with an early age of onset or a familial history of CRC- or HNPCC-related cancers, including gastric cancer, even if they do not fulfill the former Amsterdam criteria. |
This publication refers to following REPAIRtoire entries:
| Proteins |
Last modification of this entry: Oct. 6, 2010
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