WT1 and glomerular disorder: It should be noted that while WT1 is a proven histologic biomarker of podocytes [4, 118, 134], in a number of glomerulopathies WT1 protein is immunohistochemically expressed in glomerular parietal epithelium; therefore, WT1 as a biomarker of podocytes may not be exclusive and specific in diseased states [4, 135].