title: HER2 Ile655Val polymorphism contributes to breast cancer risk: evidence from 27 case-control studies.
abstract: Proto-oncogene HER2 (also known as erbB-2 or neu) plays an important role in the carcinogenesis and the prognosis of breast cancer. Many epidemiological studies have been conducted to explore the association between the HER2 Ile655Val polymorphism and breast cancer risk. However, inconsistency existed in the results. Therefore, we performed a meta-analysis of 27 published case-control studies including 11,504 cases and 12,538 controls. We assessed the strength of the association by crude odds ratios (ORs) with 95% confidence intervals (CIs) and reached a result that HER2 Ile655Val polymorphism was associated with an increased breast cancer risk in overall populations (for Ile/Val vs. Ile/Ile: OR = 1.05, 95% CI = 1.00-1.12, P = 0.07 for heterogeneity; for the dominant model Ile/Val + Val/Val vs. Ile/Ile: OR = 1.10, 95% CI = 1.01-1.20, P = 0.01 for heterogeneity). In subgroup analysis by ethnicity, we found a significant association among Africans (for Val/Val vs. Ile/Ile: OR = .78, 95% CI = 1.94-39.72, P = 0.35 for heterogeneity; for the recessive model Val/Val vs. Ile/Val +Ile/Ile: OR = 8.60, 95% CI = 1.92-38.48, P = 0.31 for heterogeneity) and Asians (for Ile/Val vs. Ile/Ile: OR = 1.18, 95% CI = 1.01-1.39, P = 0.41 for heterogeneity; for the dominant model Val/Val + Ile/Val vs. Ile/Ile: OR = 1.18, 95% CI = 1.01-1.38, P = 0.27 for heterogeneity). In conclusion, our meta-analysis suggests that HER2 Ile 655Val polymorphism may contribute to breast cancer risk.
authors.affiliation: Key Laboratory of Breast Cancer Prevention and Therapy, Tianjin Medical University, Ministry of Education, 30006, Tianjin, China.
authors.forename: Su
authors.initials: S
authors.lastname: Lu
authors.forename: Zhanwei
authors.initials: Z
authors.lastname: Wang
authors.forename: Hong
authors.initials: H
authors.lastname: Liu
authors.forename: Xishan
authors.initials: X
authors.lastname: Hao
mesh_terms: D044466:Asian People / Q000235:genetics; D044383:Black People / Q000235:genetics; D001943:Breast Neoplasms / Q000208:ethnology / Q000235:genetics*; D016022:Case-Control Studies; D019317:Evidence-Based Medicine; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D016017:Odds Ratio; D010641:Phenotype; D020641:Polymorphism, Single Nucleotide; D000090063:Proto-Oncogene Mas; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000235:genetics*; D018570:Risk Assessment; D012307:Risk Factors
chemical_list: D000090063:Proto-Oncogene Mas; D018719:Erb-b2 Receptor Tyrosine Kinases; C000715470:MAS1 protein, human; C508053:ERBB2 protein, human