The potential associations of six polymorphisms were investigated, including the association of rs7124442 with suicide in a Slavic population [48]; the role of BDNF SNPs (rs6265, rs16917204, rs7103411, and rs11030104) in the risk of alcohol use disorder [49]; the effect of NGF (rs6330) in patients with major depressive disorder [40]; and the association of NRG1 (rs3924999) with the risk of schizophrenia [50] and with response to therapy in patients with major depression who have received selective serotonin reuptake inhibitor treatment for a period of 6 weeks [51]. Here, BDNF is linked to major depressive disorder.