CCL2 and type 2 diabetes mellitus: In the present study, significantly elevated plasma MCP-1 levels were observed in T2D patients with asthma (Group I) as compared with other groups i.e., individuals with T2D only (Group II, P = 0.03), asthma only (Group III, P = 0.05), and non-diabetic non-asthmatic controls (Group IV, P = 0.003).