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Five patients with progressive primary IgA nephropathy (PIgAGN) were treated by plasma-exchange (PE) combined with immunosuppressive drugs. Circulating IgA-containing immune complexes (IgAIC), detected by a specific conglutinin solid phase assay, were monitored. Two patients with acute nephritic syndrome and rapidly progressing course, crescent formations and high levels of IgAIC had substantial lasting clinical improvement after several PE, with a fall in IgAIC levels. Another rapidly progressive case with marked sclerotic changes and a longer history of nephritic syndrome, but with normal levels of IgAIC, did not show any clinical improvement after PE. Two patients with a PIgAGN diagnosed several years before and presenting slowly evolutive course had no substantial clinical benefit from PE treatment. IgAIC levels, very high before PE temporarily decreased, but returned to the previous values after the end of the treatment. We conclude that PE combined with immunosuppressive treatment may be of clinical benefit for cases with acute nephritic syndrome of recent onset who still have high levels of IgAIC, even when important crescent formations are present.
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