Abstract
We compared 29 gastric carcinomas from patients with a variably strong family history for gastric cancer (group 1) with 36 gastric carcinomas from patients without a family history of this disease (group 2) for microsatellite instability (MSI) and loss of heterozygosity (LOH) with 12 microsatellite markers. Both study groups had similar proportions of histological types and tumor locations. Widespread MSI (alterations at > or = 6 loci) was seen in 5 of 29 (17%) of the tumors belonging to group 1 and in 4 of 36 (11%) group 2 tumors. MSI at a low level (alterations at 1 to 3 loci) was observed in 12 of 29 (41%) of tumors in group 1 and in 10 of 36 (28%) of tumors in group 2, differences that were not statistically significant. A significant difference with respect to low level MSI was observed between the two groups when considering the overall mutation rate of microsatellites. Seventeen of 281 (6%) analyzed microsatellite loci showed alterations in group 1 and 11 of 381 (2.9%) in group 2 (P = 0.046). Comparison of both types of MSI to the clinicopathological parameters in both groups revealed a significant association of low level MSI with advanced tumor stages (P = 0.046) in the group 2, whereas no such association was observed in group 1. In respect to LOH, a significant difference between the two groups was observed at chromosome 17p12, as 13 of 22 (59%) informative cases of group 1 showed LOH in comparison with 7 of 26 (27%) (P = 0.024) in group 2. No correlation of LOH at chromosome 17p12 to the pathological or clinical data was observed either in the two groups or in the study as a whole. Our data show that gastric carcinomas of patients with a positive family history of gastric cancer in group 1 are characterized by a higher mutation rate in respect to low level MSI, particularly at dinucleotide repeats, and by a higher frequency of LOH at chromosome 17p12, indicating that different genetic pathways are involved in the pathogenesis of gastric carcinomas arising in patients with and without a familial background of this disease.
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