BDNF and schizoaffective disorder: However, in spite of being a relevant psychiatric diagnosis and closely related to those previously described, no evidence was found in the search for the study of BDNF as a marker of response to treatment that separates this clinical group from patients with SCZ, since, in many of the studies found, although they spoke of both disorders, their sample was composed mainly of the first type of patient and their conclusions made few allusions to schizoaffective disorder [59,60].