ABCG2 and breast carcinoma: 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).