GSTM1 and cancer: Polymorphisms: GSTO2*N142D (A424G; rs156697) and polymorphisms of other GSTs (GSTM1, GSTT1)Main findings: - no association between GSTO2*N142D variant and gastric cancer risk;- decreased risk of gastric cancer in subjects without history of cancer in their first-degree relatives and with homozygous GSTO2*N142D (D/D) genotype.