SOD1 and amyotrophic lateral sclerosis: The evaluation of GPx activity, glutathione reductase (GR), SOD, total serum antioxidant status (TAS), MDA and 8-OHdG in ALS patients, found a significant decrease in TAS levels and an increase of 8-OHdG and MDA levels, together with significantly higher oxidized/reduced glutathione (GSSG/GSH) ratio and IL-6 and IL-8 (Blasco et al., 2017).