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Large\u2010scale genetic association studies have identified variants robustly associated with BC risk in European women. We examine here the relevance of these variants to Colombian BC and possible interactions with genetic ancestry. Native American, European and African proportions were estimated for 1022 Colombian BC cases and 1023 controls. Logistic regression was applied to assess the association between 78 variants and BC risk and interactions between the variants and ancestry proportions. We constructed a multifactorial risk score combining established BC risk factors, associated risk variants and individual ancestry proportions. Each 1% increase in the Native American proportion translated into a 2.2% lower BC risk (95% CI: 1.4\u20132.9). Thirteen variants were associated with BC in Colombian women, with allele frequencies and risk effects partially different from European women. Ancestry proportions moderated the risk effects of two variants. The ability of Native American proportions to separate Colombian cases and controls (area\u2010under\u2010the\u2010curve (AUC) = 0.61) was similar to the discriminative ability of family history of BC in first\u2010degree female relatives (AUC = 0.58) or the combined effect of all 13 associated risk variants (AUC = 0.57). Our findings demonstrate ample potential for individualized BC prevention in Hispanic women taking advantage of individual Native American proportions, information on established susceptibility factors and recently identified common risk variants.<\/jats:p>","DOI":"10.1002\/ijc.32023","type":"journal-article","created":{"date-parts":[[2018,11,28]],"date-time":"2018-11-28T17:37:45Z","timestamp":1543426665000},"page":"2181-2191","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Interaction between genetic ancestry and common breast cancer susceptibility variants in Colombian women"],"prefix":"10.1002","volume":"144","author":[{"given":"Diana","family":"Torres","sequence":"first","affiliation":[{"name":"Molecular Genetics of Breast Cancer, German Cancer Research Center (DKFZ)  Heidelberg Germany"},{"name":"Institute of Human Genetics, Pontificia Universidad Javeriana  Bogota 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