According to the work [111], in which the analysis of the results obtained was conducted by the multiple regression method, the level of proinflammatory cytokine IL-6 has negative correlation with the cognitive function parameters in outpatients with schizophrenia (r=–0.395), whereas the levels of IL-2, IL-4, IL-10, IL-17A, TNF-α, IFN-γ are not associated with cognitive functioning. Here, TNF is linked to schizophrenia.