In particular, rs1128503 (ABCB1, C > T), rs12762549 (ABCC2, C > G), rs363717 (ABCA1, A > G) and rs11615 (ERCC1, T > C) were significantly associated with grade 3–4 anemia (p = 0.035, OR 1.58; p = 0.005, OR 0.55; p = 0.001, OR 1.31 and p = 0.024, OR = 1.58). The gene discussed is ABCB1; the disease is anemia.