Resumen

CASTANO-MOLINA, Eduardo; SANTACOLOMA, Mario; ARANGO, Lázaro  y  CAMARGO, Mauricio. CYP1A1, CYP2E1 AND GASTRIC CANCER RISK IN A HIGH-INCIDENCE COLOMBIAN POPULATION. Acta biol.Colomb. [online]. 2009, vol.14, n.3, pp.205-211. ISSN 0120-548X.

The aim was to test the hypothesis that some cases and controls, in a Colombian population with a high incidence of gastric cancer, show significant differences among the frequencies of CYP1A1*2A, CYP2E1*5A gene polymorphisms and simultaneously to test the differences between the tobacco smoking habit and the socio-economic stratum as well as their possible interactions. For two consecutive years were diagnosed and confirmed eighty-seven patients affected by gastric cancer and an equal number of controls matched by age and the same population group, belonging to the “paisa” community in the Colombian Province of Caldas. Were genotyped by PCR-RFLP for CYP1A1*2A and CYP2E1*5A polymorphisms. Besides, socio-demographic variables and the lifestyle with reference to tobacco smoking and alcohol consumption were taken into account. The results suggest that carriers of the CYP2E1-c2 allele associated with higher metabolic activity, are more likely to develop gastric cancer (OR = 3.6 95% CI 1,6 - 8,1/p = 0.002). In contrast, the allele frequency of CYP1A1-m2, also associated with increased enzyme activity, showed similar frequency between the two groups. Tobacco smoking and the low socio-economic stratum also showed differences significant. In conclusion, we found a significant interaction gene-environment, particularly between smoking and bioactiavantes CYP2E1-c2 and CYP1A1-m2 alleles which can alter the susceptibility to gastric cancer in the Andean region of northwestern South America characterized by high incidence of this neoplasm.

Palabras clave : CYP1A1; CYP2E1; Colombia; gastric cancer; smoking; socioeconomic status.

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