The association between urinary TGFβ and the degree of kidney IF could not be confirmed in a small study of a heterogeneous group of nephropathies (fifteen cases of IgAN, nine of MGN, seven of rapid progressive glomerulonephritis (RPGN), eight of systemic lupus erythematodes (SLE), and nine of interstitial nephritis (IN)) [75]. This evidence concerns the gene TGFB1 and idiopathic membranous glomerulonephritis.