ABCG2 and breast cancer: Table 3 summarizes three different genetic models and the chi-squared value for each. The ABCG2 gene was excluded from the analysis because it expressed only two genotypes. For the ABCC1 SNP rs4148351, Het (CT) versus Common Hz (CC) was found to be associated with BC in Jordanian Arabs (χ2 = 5.33; p value <0.05). Similarly, for the ABCB1 SNP rs1128503, the Rare Hz (AA) versus Common Hz (GG) model was related to BC in Jordanian Arabs (χ2 =4.52; p value <0.05). No such association was found for any of the ABCC2 SNPs (Table 3).