CCL2 and fibrosis: The tubulointerstitial fibrosis grade was moderately correlated with TGF-β1 and MCP-1 expression in both disease groups (HSPN: Spearman correlation coefficient for TGF-β1=0.56, p<0.001; Spearman correlation coefficient for MCP-1=0.63, p<0.001; IgAN: Spearman correlation coefficient for TGF-β1=0.72, p<0.001; Spearman correlation coefficient for MCP-1=0.62, p<0.001) (Tables 5–8).