GSTO1 and chronic atrophic gastritis: HP-positive carriers of the GSTO1*A variant allele showed increased risk of developing gastric atrophy and precancerous gastric lesions compared with the reference one (OR = 2.49, 95%CI:1.04–5.96, p = 0.04 and OR = 2.98, 95%CI = 1.21–7.34, p = 0.018, respectively).