A2M and major depressive disorder: Alterations were also observed in other proteins, such as HDLC, APOA1, SAA1, fibrinogen, GM-CSF, NPY, hypocretin, AAT, α2M, MIF, VEGF, VEGF-C, VEGFR1, FGF basic, ICAM-1, PIGF, FVII, and TF, as well as in factors, such as PIC, QUIN, PIC/QUIN ratio, arachidonic acid, DHA, EPA, TC, HDL, LDL, TG, MPO, TRAP, APC, TLR-1, Tie-2, AOPP, MDA, ERS, FX, and more in MDD patients with suicide-related behaviors.