CD79A and membranoproliferative glomerulonephritis: CGN, chronic glomerulonephritis; FSGN, focal segmental glomerulosclerosis; HD, hemodialysis; IgA, immunoglobulin A; MCD, minimal change disease; MGN, membranous glomerulonephritis; MPGN, membranoproliferative glomerulonephritis; PGN, paraneoplastic glomerulopathy