Frequency distributions for the GSTT1 and GSTM1 null genotypes were comparable in patients with gastric atrophy/intestinal metaplasia compared with patients without premalignant lesions (19.4% versus 22.0%, χ2(1) = 0.28, p = 0.653; 55.8% versus 45.4%, χ2(1) = 2.93, p = 0.090, resp). The gene discussed is GSTM1; the disease is chronic atrophic gastritis.