JOURNAL ARTICLE
Apolipoprotein B-100 XbaI gene polymorphism in gallbladder cancer.
Human Genetics 2004 Februrary
Genetic polymorphisms in the apolipoprotein B (apoB) gene have been reported to be associated with altered serum lipids and susceptibility to cholesterol gallstones (GS). Gallstones are among the well-known risk factors for carcinoma of the gallbladder (GBC). In the present study, the association between the XbaI polymorphism of the apo B gene was examined in patients with GBC and GS and in normal controls in a north Indian population. DNA samples from patients with GBC (n=153), GS (n=117) and healthy subjects (n=137) were analysed for the apoB- XbaI polymorphism by polymerase chain reaction followed by restriction fragment length polymorphism. The genotype X+/- was less frequent in patients with GBC (39.2%) than in those with GS (68.3%) and in normal subjects (66.4%; P<0.00001). In contrast, there was an increase in the homozygous X-/- genotype in patients with GBC (54.9%) as compared with those with GS (23.9%) and normal subjects (25.5%; P<0.00001). The frequency of the X- allele was found to be significantly increased in GBC patients with or without GS (odds ratio=2.3 and 1.7, respectively). We suggest that the apoB-XbaI gene polymorphism confers susceptibility to carcinoma of the gallbladder under specific environmental conditions.
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