OPRM1 and lung cancer: Among patients who underwent radical resection of lung cancer, the consumption of PCEA sufentanil at T1, T2 and T3 in the patient groups carrying mutant-type homozygotes at rs1799971 and rs1323040 loci of OPRM1 as well as rs2032582 and rs1128503 loci of ABCB1 was significantly increased compared with that of the wild-type homozygote and mutant-type heterozygote groups.