Twelve HBsAg-negative patients with histologically documented cirrhosis of the liver of either alcoholic (8 of 12) or cryptogenic (4 of 12) origin underwent renal biopsy to investigate proteinuria, hematuria and/or renal failure. Immunofluorescence was positive for IgA in 2 patients with mesangiocapillary glomerulonephritis (MCGN) and could not be performed in 2 additional patients with the same diagnosis. However, in the remaining 8 patients, immunofluorescence was negative for IgA and frequently positive for C3, IgG, IgM and/or fibrinogen. These 8 patients without IgA were classified as follows: MCGN with subendothelial electron-dense deposits (2 cases), IgM-IgG cryoglobulinemia with diffuse endocapillary glomerulonephritis (1 case), membranous nephropathy (1 case), diffuse endocapillary proliferative glomerulonephritis (1 case), vasculitis with focal segmental necrotizing glomerulitis and crescentic glomerulonephritis (2 cases). These results show that cirrhosis of the liver can be associated with a wide variety of glomerular disorders. Contrary to previous belief, IgA is absent in two thirds of patients with cirrhosis and glomerulopathy. Therefore, the pathogenetic importance of IgA in the development of glomerular disease in such patients is doubtful.