In this study, only 12 and 14 cases of type II glomerulonephritis with crescents and type III glomerulonephritis with crescents, respectively, fulfilled the strict definition of CreGN, whereas type II glomerulonephritis with crescents did not include postinfectious glomerulonephritis or RPGN-type IgA-N. The gene discussed is CD79A; the disease is rapidly progressive glomerulonephritis.