Diffuse proliferative glomerulonephritis?how many types?

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Abstract
Fifty-four biopsies of diffuse proliferative glomerulonephritis were subdivided into two groups, diffuse endocapillary proliferative glomerulonephritis (DEPGN) and mesangial proliferative glomerulonephritis (MPGN) according to current morphological criteria. The two groups were then compared by light microscopy, cell counting techniques, electron microscopy, immunofluorescence or immunoperoxidase techniques, and a clinical survey. The results show that DEPGN differs from MPGN in only three points: (1) the former has a greater degree of mesangial proliferation, (2) the former has a less favourable short-term prognosis and (3) large subepithelial deposits (humps) are much more common in DEPGN than in MGPN (in this series no MPGN cases showed such deposits), while small dark deposits are present in or on the glomerular capillary basement membrane in more cases of MPGN than of DEPGN. It is proposed that biopsies showing diffuse proliferation of mesangial cells should be classified as diffuse proliferative glomerulonephritis of a mild, moderate or severe degree, as the current classification has been interpreted as implying separate aetiologies and suggests that these are two distinct disease entities.