GSTM1 and lung cancer: GSTM1 (null)/GSTP1 (Ile/Ile) (OR=1.174, 95%CI=0.704-1.957), GSTT1 (null)/GSTP1 (Ile/Val+Val/Val) (OR=1.354, 95%CI=0.778-2.356) (Table 5) correlated to lung cancer risk and statistically non- significant.