TGFA and major depressive disorder: A total of four inflammatory cytokines were associated with MDD, of which CCL19 (IVW: OR = 1.036, 95% CI: 1.001–1.072, p= 0.045; Figure S45), IFN‐γ (IVW: OR = 1.053, 95% CI: 1.001–1.108, p= 0.046; Figure S46), and TGF‐α (IVW: OR = 1.075, 95% CI: 1.015–1.138, p= 0.014; Figure S47) were risk factors for MDD, whereas TNFB (IVW: OR = 0.965, 95% CI: 0.934–0.996, p= 0.027; Figure S48) was protective against MDD.