Pro-inflammatory cytokines level in depressed patients with suicidal behaviour: a systematic review and meta-analysis

The review found no significant cytokine differences (including IFN-γ, IL-1β, IL-2, IL-4, IL-8, IL-10, TGF-β1, TNF-α) between depressed individuals with or without suicidal ideation and controls. Variations likely reflect methodological differences, highlighting the need for standardized, longitudinal research.