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. 1997 Jun;12(2):144-54.
doi: 10.3904/kjim.1997.12.2.144.

Microsatellite instability in Korean patients with gastric adenocarcinoma

M S Jee  1 , C Koo, M H Kim, C Choi, K M Lee, S K Choi, J S Rew, C M Yoon
Affiliations

Microsatellite instability in Korean patients with gastric adenocarcinoma

M S Jee et al. Korean J Intern Med. 1997 Jun.

Abstract

Objectives: Microsatellites are short repeated oligonucleotide sequences found throughout the human genome. High mutation rates in microsatellite sequences have been found in tumors from patients with hereditary non-polyposis colorectal carcinoma and some sporadic carcinomas. However, little information is available regarding RER-positive phenotype in gastric carcinomas, particularly in terms of age of onset and other pathologic features, such as histologic types, degree of differentiation, location or stage of the carcinoma.

Methods: To obtain a better understanding of the molecular mechanism of gastric carcinogenesis, microsatellite instability was examined at 6 gene loci (D2S71, D2S119, D3S1067, D6S87, D8S87, D11S905) in 77 gastric carcinomas (40 cases of young patients and 37 cases of elderly patients).

Results: RER-positive phenotypes were found in 17 (22.1%) of 77 cases. In young patients (under 40 years) RER-positive phenotype was found in 9 (22.5%) of 40 cases, and in elderly patients 8 (21.6%) of 37 cases. Moderately differentiated carcinoma revealed a significantly high frequency of RER-positive phenotype than well differentiated carcinoma(p < 0.001). Tumors arising from the middle third (p < 0.001) or lower third (p < 0.001) revealed higher frequency of RER-positive phenotype than the tumors arising from the upper third of the stomach. The RER-positive phenotype was not significantly affected by the sex, histologic type or stage of carcinoma.

Conclusion: RER-positive phenotype occurs frequently in gastric carcinoma, although the frequency of RER-positive phenotype between young and elderly patient was not significantly different. Thus, the acquisition of RER-positive phenotype might be an early event in gastric carcinogenesis.

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Figures

Fig. 1.
Fig. 1.
Analysis of genetic instability in paired normal (N) and tumor (T) DNA at loci D2S71 of J21 patient (A), and D8S87 of O29 and O28 patients (B). At tumor DNAs, abnormal patterns indicating expansion are shown at each microsatelite locus. Normal alleles appear as major bands with their ladders. Patient numbers are shown above the lanes. MI(+); microsatellite-positive, MI(−); microsatellite-negative
See this image and copyright information in PMC

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