Similar differences were observed for the breast cancer risk gene ABCC11 (1.8 in East Asians compared to 0.5 in Africans), as well as the multi-drug resistance genes ABCB1 (1.4 in South Asians compared to 0.2 in Africans) and ABCG2 (1.3 in East Asians compared to 0.1 in Europeans). This evidence concerns the gene ABCB1 and breast cancer.