CCL2 and Schnyder corneal dystrophy: However, strong positive correlations were observed between plasma IL-6, IL-8, and MCP-1 in the NC group (p < 0.01), and also found a strong positive correlation between MCP-1 and IL-8 in the plasma of patients with SCD (R = 0.53, p = 0.00025); the detailed results are presented in the Supplementary Figure 8.