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Aberrant CpG island methylation in early-onset sporadic gastric carcinoma

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Abstract

Purpose: Gastric carcinoma more commonly affects older patients, and it is thought that cases of early-onset gastric carcinoma may develop with a different molecular profile different from that of carcinoma occurring at a later age. We assayed the methylation status and genetic changes in genes associated with the APC-β-catenin axis and the mismatch repair system in relatively early-onset gastric carcinoma samples to determine their association with gastric carcinogenesis. Methods: Tumor and normal tissue DNA samples were obtained from 40 patients with early-onset (< 50 y) gastric carcinomas and assayed for APC and CTNNB1 mutations, microsatellite instability, and methylation of the promoters of the hMLH1, TIMP3, THBS1, DAP- K, GSTP1 , APC, and MINT2. Results: Promoter methylation at these seven loci ranged from 12.5 to 62%, with 38/40 tumors (95%) showing promoter methylation at more than one locus. The CpG island methylation phenotype (CIMP) was classified as high in 16 tumors (40%), low in 22 tumors (55%), and negative in 2 tumors (5%). Two concurrent missense mutations (E1685G, R1763L) in the APC mutation cluster region were detected in two tumors, nine tumors showed loss of APC heterozygosity (LOH), and two showed both LOH and promoter methylation. Conclusions: Our results indicate that, unlike in colorectal carcinoma, APC and CTNNB1 mutations do not appear to be highly implicated in early-onset gastric carcinogenesis. In contrast, our data show that promoter methylation is a prevalent phenomenon in early-onset gastric carcinoma and may be related to gastric carcinogenesis.

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Acknowledgements

This work was supported by the Korea Research Foundation Grant (KRF-2002-003-E00089).

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Correspondence to Hee Cheol Kim.

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Kim, H.C., Kim, J.C., Roh, S.A. et al. Aberrant CpG island methylation in early-onset sporadic gastric carcinoma. J Cancer Res Clin Oncol 131, 733–740 (2005). https://doi.org/10.1007/s00432-005-0017-0

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Keywords

  • Stomach neoplasms
  • Carcinogenesis
  • Methylation
  • APC
  • Microsatellite instability