As determined by a chi‐squared test, the distributions of ERCC1 rs2298881 C>A (p < 0.001), ERCC1 rs11615 G>A (p < 0.001), and XPF rs2276466 C>G (p = 0.002) differed significantly between Uygur and Han patients with breast cancer. Here, ERCC4 is linked to breast cancer.