Correlation between the levels of hepcidin-25 and IL-6. The serum IL-6 concentrations were less than 30 pg/mL in all the patients receiving hemodialysis (•, n = 40), except one with systemic lupus erythematosus. In patients with inflammation (○, n = 16), a good correlation was observed between the levels of hepcidin-25 and IL-6 (r = 0.60).