C3 and Atrophy: Regarding the correlation of complement or IgM deposits with clinicopathological parameters, C3 displayed significant correlation with a higher IFTA (interstitial fibrosis/tubular atrophy) (p = 0.027) score and GS (glomerulosclerosis) (p = 0.0048), as well as with more extensive areas of tubular atrophy (p = 0.008) and interstitial fibrosis (p = 0.024).