IL6 and diabetes mellitus: On the other hand, compared with the T2DM group, the duration of diabetes, FPG, HbA1c, TG, CRP, IL-6 levels in peripheral blood (P-IL-6), WBC, and ESR levels appeared to increase significantly in the DFU group (P < 0.05), while the mean sunshine duration per day in the recent 3 months, eGFR, serum albumin, hemoglobin, serum 25(OH)VD, TcPO2, ABI levels significantly decreased (P < 0.05).