However, in another study from Thailand including premenopausal and postmenopausal women [99], no association between GSTO1 and GSTO2 genotypes and the risk of breast cancer was found, although a higher prevalence of the homozygous wild-type GSTO1*A140 allele (A/A) was found in advanced-stage breast cancer. This evidence concerns the gene GSTO1 and breast cancer.