Angptl4 staining was absent (as in control) in glomeruli from 4 MCD patients in relapse, 1 patient with membranoproliferative glomerulonephritis (MPGN) in relapse, and 1 of 6 with FSGS and heavy proteinuria (Fig 3). Here, ANGPTL4 is linked to primary membranoproliferative glomerulonephritis.