SOD1 and central nervous system cancer: The determined changes in the enzymatic system of the antioxidant defense in rat glioma C6 cells treated with 4-thiazolidinone derivatives were the following: activity of SOD was decreased under the action of the doxorubicin and the compound ID 3833, but not by other compounds – ID 3288 and ID 3882, and the GPO activity was reduced at the action of all used compounds and doxorubicin.