细胞毒T淋巴细胞相关抗原4基因多态性与乳腺癌易感性的关联研究

目的: 探讨CTLA-4基因多态性位点-1722T/C和CT60G/A与中国北方汉族妇女乳腺癌易感性的关系.方法: 采用聚合酶链反应(PCR)和限制性片段长度多态性方法, 对328例中国北方汉族乳腺癌患者和327例正常对照者进行CTLA-4基因-1722位点和CT60位点多态性检测. 结果: 乳腺癌患者CTLA-4基因CT60位点G等位基因频率在乳腺癌患者组中明显高于正常对照组(28.7% 比23.5%; P=0.0352, OR=1.30, 95% CI=1.02～1.67); -1722C-CT60A单体型在对照组中的频率大于病例组中的频率, 有明显差异(P=0.0283, OR=0.77, 95% CI=0.97～0.61), 而在-1722位点基因型频率、等位基因频率与对照组比较差异无统计学意义(P＞0.05).结论: CTLA-4基因多态性-1722和CT60两个位点与我国北方汉族妇女乳腺癌发病存在一定的相关性.

Association of cytotoxic T lymphocyte antigen-4 gene polymorphisms with susceptibility to breast cancer

AIM: To investigate the association between the CTLA-4 promoter-1722(T/C) and 3' untranslated region CT60(G/A) polymorphisms and the risk of breast cancer in Han women of northeast China. METHODS: 328 patients with breast cancer and 327 healthy people as control were genotyped for -1722 and CT60 polymorphism using polymerase chain reaction and restriction fragment length polymorphism. RESULTS: The frequency of the G allele at the CT60 site in breast cancer patients was statistically higher than that in control(28.7% vs 23.5%, P=0.0352, OR=1.30, 95% CI=1.02-1.67). The frequency of -1722C-CT60A haplotype in control was significantly higher than that in breast cancer patients(P=0.0283, OR=0.77, 95% CI=0.97-0.61). However, the distribution of genotypes at -1722 site was not significantly different between breast cancer patients and control. CONCLUSION: The polymorphism of -1722T/C and CT60G/A may be related to the development of breast cancer in Han women of northern China.