MMP9 has previously been shown to be produced by podocytes 16, 33 and altered in a number of glomerular diseases, including lupus nephritis with active, fibrocellular crescents 40, DN 33, 41; viral‐associated glomerulonephritis 42, membranous 43 and hypertensive 44 nephropathy. This evidence concerns the gene MMP9 and glomerular disorder.