Microsatellite instability in precancerous lesions and adenocarcinomas of the stomach
Abstract
It is generally known that replication errors (RERs) at microsatellite loci detected in human malignancies reflect a genetic instability that is caused by abnormalities of DNA mismatch repair system and underlie human carcinogenesis. The authors analyzed RERs in precancerous lesions and adenocarcinomas of the stomach to learn when genetic instability occurs in stomach carcinogenesis. In addition, the authors examined genetic instability occurs in stomach carcinogenesis. In addition, the authors examined genetic alterations of the p53 and adenomatous polyposis coli (APC) genes to investigate the correlation between genetic instability and genetic alterations in these tumor suppressor genes. The authors examined microsatellite assay at 9 microsatellite loci in 24 sporadic gastric cancers, 12 gastric adenomas, and 9 intestinal metaplasia mucosae of the stomach from patients with gastric cancers using fresh frozen or formalin fixed and paraffin embedded samples paired with normal mucosae. They also screened loss of heterozygosity (LOH) of the p53 and APC genes by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis. In total, the RER(+) phenotypes were observed in 8 of 24 (33%) gastric cancers, 5 o...Continue Reading
References
Citations
Altered microsatellites in incomplete-type intestinal metaplasia adjacent to primary gastric cancers
Clinical significance of mutator phenotype and chromosome 17p and 18q allelic loss in gastric cancer
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