title: The association of CTLA-4 A49G polymorphism with colorectal cancer risk in a Chinese Han population.
abstract: Cytotoxic T-lymphocyte antigen-4 (CTLA-4) is expressed in T cells and plays an important role in the regulation of T cell. CTLA-4 has long been considered to be associated with various kinds of diseases. With the attempt to examine the association between CTLA-4 A49G polymorphism and colorectal cancer risk in a Chinese Han population, we employed TaqMan assay to genotype the CTLA-4 A49G polymorphism in 311 colorectal cancer cases and 389 cancer-free controls. We found evidence of the association between CTLA-4 A49G polymorphism and colorectal cancer risk (GG vs. AA: OR = 2.01, 95% CI = 1.29-3.07, P = 0.002; GA vs. AA: OR = 2.32, 95% CI = 1.53-3.57, P = 0.001; GA + GG vs. AA: OR = 2.16, 95% CI = 1.46-3.21, P = 0.001). Next, we performed a meta-analysis to comprehensively examine the association between CTLA-4 A49G polymorphism and colorectal cancer risk. We found a significant association between CTLA-4 A49G polymorphism and colorectal cancer risk among Asians, which is consistent with our result. However, we found no evidence for the association between CTLA-4 A49G polymorphism and colorectal cancer risk among Caucasians. In conclusion, we demonstrated that the CTLA-4 A49G polymorphism increased the susceptibility of colorectal cancer in Asian population.
authors.affiliation: Department of Hepatic Surgery, Fudan University Shanghai Cancer Center, Shanghai, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: X
authors.initials: X
authors.lastname: Wang
authors.forename: R
authors.initials: R
authors.lastname: Zhao
mesh_terms: D000328:Adult; D000368:Aged; D000483:Alleles; D060908:CTLA-4 Antigen / Q000235:genetics*; D016022:Case-Control Studies; D002681:China; D015179:Colorectal Neoplasms / Q000235:genetics* / Q000473:pathology; D005260:Female; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D016017:Odds Ratio; D011110:Polymorphism, Genetic; D020641:Polymorphism, Single Nucleotide; D012307:Risk Factors
chemical_list: D060908:CTLA-4 Antigen