title: The p21 Ser31Arg polymorphism and breast cancer risk: a meta-analysis involving 51,236 subjects.
abstract: Published data on the association between p21 Ser31Arg polymorphism and breast cancer risk are inconclusive. To derive a more precise estimation of the relationship, a meta-analysis was performed. Crude ORs with 95% CIs were used to assess the strength of association between the p21 Ser31Arg polymorphism and breast cancer risk. The pooled ORs were performed for co-dominant model (Ser/Arg vs. Ser/Ser, Arg/Arg vs. Ser/Ser), dominant model (Arg/Arg + Ser/Arg vs. Ser/Ser), and recessive model (Arg/Arg vs. Ser/Arg + Ser/Ser). A total of 21 studies including 22,109 cases and 29,127 controls were involved in this meta-analysis. Overall, no significant associations were found between p21 Ser31Arg polymorphism and breast cancer risk when all studies pooled into the meta-analysis. In the subgroup analysis by ethnicity, significantly increased risk was found for Caucasians (Arg/Arg vs. Ser/Ser: OR 1.496, 95% CI 1.164-1.924; and recessive model: OR 1.492, 95% CI 1.161-1.919). When stratified by study design, statistically significantly elevated risk was found for population-based studies (Ser/Arg vs. Ser/Ser: OR 1.085, 95% CI 1.019-1.156). In conclusion, this meta-analysis suggests that the p21 Ser31Arg polymorphism may be associated with breast cancer development in Caucasian. However, large sample and representative population-based studies with homogeneous breast cancer patients and well-matched controls are warranted to confirm this finding.
authors.affiliation: Department of Medical Oncology, Cancer Hospital, Fudan University, Shanghai, China. mdqiulixin@hotmail.com
authors.forename: Li-Xin
authors.initials: LX
authors.lastname: Qiu
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Zhu
authors.forename: Chun-Lei
authors.initials: CL
authors.lastname: Zheng
authors.forename: Si
authors.initials: S
authors.lastname: Sun
authors.forename: Zhong-Hua
authors.initials: ZH
authors.lastname: Wang
authors.forename: Xin-Min
authors.initials: XM
authors.lastname: Zhao
authors.forename: Jia-Lei
authors.initials: JL
authors.lastname: Wang
authors.forename: Lei-Ping
authors.initials: LP
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Yu
authors.forename: Kai
authors.initials: K
authors.lastname: Xue
authors.forename: Xi-Chun
authors.initials: XC
authors.lastname: Hu
mesh_terms: D001943:Breast Neoplasms / Q000208:ethnology / Q000235:genetics*; D016022:Case-Control Studies; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D016017:Odds Ratio; D011110:Polymorphism, Genetic; D018570:Risk Assessment; D012307:Risk Factors; D044465:White People / Q000235:genetics
chemical_list: C493956:CDKN1A protein, human; D050759:Cyclin-Dependent Kinase Inhibitor p21