GSTO2 and chronic obstructive pulmonary disease: Polymorphisms: Five GSTO1 polymorphisms (rs11191975, rs1147611, rs11509438, rs2164624, rs628480) and six GSTO2 polymorphisms (rs10491045, rs11191990, rs156699, rs157077, rs157080, rs568526) as a part of 470 SNPs in 52 genes involved in glutathione metabolism, DNA repair, and inflammatory response pathwaysMain findings:- significant association between GSTO2-2 gene and COPD with lung cancer.