When the frequencies of GSTT1/GSTM1 genotypes were combined and their impact on ALL susceptibility was observed, GSTT1null in combination with GSTM1null (OR = 4.11, 95% CI = 1.16–7.62, p = 0.011) significantly associated with the increased risk of ALL. Here, GSTM1 is linked to acute lymphoblastic leukemia.