Precision Psychiatry for Depression: Immune Response and Affective Symptoms as Predictors of Response to Antidepressants

"Outpatients with a diagnosis of major depression in the Psychiatry Outpatient Clinics will be evaluated for recruitment.~* Recruitment visit: It will be carried out by one of the psychiatrists participating in the study. The patient will be informed about the study and written consent will be requested. Subsequently, the inclusion and exclusion criteria will be reviewed, and all demographic and clinical variables will be collected.~* Baseline visit: One of the psychiatrists will interview the patient and apply the semi-structured clinical interview and the psychopathological evaluation questionnaires. In addition, a blood draw will be performed for serum collection, spectral cytometric analysis of lymphocyte subpopulations and obtaining peripheral blood mononuclear cells (PBMCs).~* Follow-up visit after 3 months of treatment: Clinical variables will be collected and the same procedures will be performed as during the baseline visit. Not in the control group."