Table 1.

Potential biomarkers in peripheral blood for the diagnosis of MDD

Cytokine	Baseline serum level of cytokine in MDD vs controls	Reference(s)
IL6	Increased	6–13
IL10	Reduced	14
IL13	Reduced	15
IL1β	Increased	9
	No significant difference	10
TNF	Increased	8, 10, 12, 16

Abbreviation: MDD, major depressive disorder.