No significant association was observed between PPARgamma Pro12Ala polymorphism and either incident breast cancer (odds ratio = 1.08, 95% confidence interval = 0.85-1.38 for Ala allele carriers compared to non-carriers), plasma hormones, plasma cholesterol, BMI, weight gain since age 18 years or waist-to-hip ratio.
Two SNPs, rs3856806 and rs1801282, had been previously analyzed, thus enabling us to perform pooled analyses on their associations with breast cancer susceptibility.
We investigated associations between TNF-α <sup>-308</sup>G > A (rs1800629); PPARγ Pro<sup>12</sup>Ala (rs1801282); and IRS-1 Gly<sup>972</sup>Arg (rs1801278) polymorphisms and anthropometric variables, circulating levels of previously measured biomarkers, and tumor characteristics in 553 women enrolled in the Health, Eating, Activity, and Lifestyle Study, a multiethnic, prospective cohort study of women diagnosed with stage I-IIIA breast cancer between 1995 and 1999 (median follow-up 14.7 years).