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10.1245/s10434-006-9054-4
Annals of Surgical Oncology 14:2246-2249 (2007)
© 2007 Society of Surgical Oncology
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Original Article

Single Nucleotide Polymorphisms in the Promoter Region of the E-cadherin Gene in Gastric Cancer: Case-Control Study in a Young Mexican Population

Heriberto Medina-Franco, MD1, Antonio Ramos-De la Medina, MD2, Gloria Vizcaino, MD, MS3 and Jose Luis Medina-Franco, PhD4

1 Department of Surgery, Section of Surgical Oncology, National Institute of Medical Sciences and Nutrition "Salvador Zubirán", Vasco de Quiroga 15, Colonia Seccion XVI, Tlalpan, Mexico City, Mexico
2 Department of Nephrology and Mineral Metabolism, National Institute of Medical Sciences and Nutrition "Salvador Zubirán", Vasco de Quiroga 15, Colonia Seccion XVI, Tlalpan, Mexico City, Mexico
3 Department of Education and Surgical Research, Veracruz Regional Hospital, Veracruz, Mexico
4 BIO5 Institute, University of Arizona, Tucson, Arizona

Correspondence: Address correspondence and reprint requests to: Heriberto Medina-Franco, MD; E-mail: herimd{at}hotmail.com

Background: Gastric cancer has a tendency to present at early age in the Mexican population, and it is frequently associated with a family history. A polymorphism at position –160 at the CDH1 promoter region has been reported to lead to transcriptional downregulation of the gene in vitro, with possible increase in the risk of gastric cancer. We evaluated the role of the –160A allele in the risk of gastric cancer in a young Mexican population.

Methods: Peripheral blood sample of Mexican patients younger than 45 years old with diagnosis of diffuse gastric cancer were obtained. We performed DNA extraction and analyzed the frequencies of –160 promoter polymorphism of E-cadherin gene by polymerase chain reaction–single strand conformational polymorphism. These frequencies were compared with those of healthy controls. The {chi}2 test for association was used to test differences of the genotype frequencies between normal controls and patients with gastric cancer. Findings were considered significant at P < .05.

Results: The frequency of the –160 A allele was significantly higher (P = .002) in 39 patients with diffuse gastric cancer compared with 78 matched controls. The odds ratio associated with the A-allele was 1.98 for C/A heterozygotes (95% CI 1.01–3.98) and 6.5 for A/A homozygotes (95% CI 2.1–19.6). We found an increased risk of diffuse gastric cancer according to family history, independent of the expression of the polymorphism.

Conclusions: The –160 C/A polymorphism of the E-cadherin has a direct effect on the risk of diffuse gastric cancer at young age in Mexican population.

Key Words: Gastric cancer • Cadherin • Polymorphism • CDH1






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