In that study, administration of SSRI in MDD patients, confirming baseline high levels of cortisol, IL-4, IL-13 and IL-10 (Th2) compared with healthy volunteers, induced clinical remission at week 20 of treatment, concomitantly with an increase in IL-2 and IL-1β levels (Th1) without changes in cortisol level. Here, IL2 is linked to major depressive disorder.