Abstract
The allele frequency of the multidrug resistance 1 (MDR1) gene C3435T polymorphism differs with different ethnic populations, such as Asian, African, and Caucasian. This polymorphism has been reported to be associated with the increase of gastric cancer. The objective of this study was to find out the association of gastric cancer incidence with MDR1 gene polymorphism in an ethnic Iranian population. In this study, 48 gastric cancer patients were diagnosed. Genomic DNA was extracted by a salting-out method. The MDR1 polymorphism was studied by a polymerase chain reaction (PCR)-restriction fragment length polymorphism method, using a standard method. The polymorphic homozygote (T/T) genotype showed significantly an association with the incidence of gastric cancer compared with controls (P < 0.05). This study suggests that C3435T polymorphism of the MDR1 gene may be associated with gastric cancer in an ethnic Iranian population.
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