Our study showed positive association to lung cancer risk with genotype combination of GSTM1 (null) and GSTT1 (null) (OR=1.76; 95% CI=1.030-3.012), showed previously by Cajas-Salazar et al., 2003 (OR=2.32; CI=1.01-6.04). Here, GSTM1 is linked to lung carcinoma.