GSTP1 and gastritis: As shown, carriers of the H3 haplotype, comprising GSTP1*G and GSTP1*T variant alleles, presented a more than 3-fold higher risk of HP-positive gastritis development (OR = 3.12, 95%CI = 1.29–7.67, p = 0.012), while the GSTO haplotype did not exert significant influence.