In addition, in the group of patients with schizophrenia, a significant moderate positive correlation was found between the percentage of dead cells and the SOD activity of the patients’ IgG samples (r = 0.439) as well as a significant weak correlation between the percentage of cells showing oxidative stress-induced death and the level of catalase activity (r = 0.355). The gene discussed is SOD1; the disease is schizophrenia.