It is also worth to consider the issue in the context of the first research concerning behavior of VSELs in first episode of psychosis (FEP) performed by Kucharska-Mazur [16], who published their findings on VSELs and HSCs in first-episode psychosis, demonstrating higher numbers of VSEL (Lin−/CD45−/CD34+) in patients with FEP both before and after antipsychotic treatment. This evidence concerns the gene CD34 and psychotic disorder.