Unconditional logistic regression analysis showed that the genotypes of rs3748067 AA (adjusted OR = 0.43, 95 % CI = 0.23-0.83) and rs8193036 TT (adjusted OR = 0.59, 95 % CI = 0.40-0.86) were associated with a decreased risk of CWP, particularly among subgroups of smokers (adjusted OR =0.34, 95 % CI = 0.13-0.86 for rs3748076; adjusted OR = 0.41, 95 % CI = 0.23-0.71 for 8193036) and CWP cases with stage I (adjusted OR = 0.45, 95 % CI = 0.21-0.98 for rs3748076; adjusted OR = 0.46, 95 % CI = 0.28-0.74 for 8193036).