Growth factors such as GM-CSF (granulocyte macrophage colony-stimulating factor), NRG1-β1 (neuregulin-1 beta 1), NGF-β (nerve growth factor beta), and GDNF (glial cell line-derived neurotrophic factor) are actively involved in inflammation processes and schizophrenia pathogenesis [15,16,17,18]. Here, NGF is linked to schizophrenia.