In the only pilot study on Serbian patients, the association between GSTO1*A140D (C419A; rs4925), GSTO2*N142D (A424G; rs156697), and GSTO2 polymorphisms in the 5′UTR gene region (A183G; rs2297235) and the risk for GCT development was investigated [34]. Here, GSTO2 is linked to granular cell tumor.