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  • Title: Interferon-alpha in combination with ribavirin as initial treatment for hepatitis C virus-associated cryoglobulinemic membranoproliferative glomerulonephritis.
    Author: Garini G, Allegri L, Carnevali L, Catellani W, Manganelli P, Buzio C.
    Journal: Am J Kidney Dis; 2001 Dec; 38(6):E35. PubMed ID: 11728995.
    Abstract:
    Mixed cryoglobulinemia (MC) and glomerulonephritis are the most important extrahepatic manifestations of chronic hepatitis C virus (HCV) infection. In HCV-infected patients with MC, renal involvement worsens the overall prognosis because of a high incidence of infection or cardiovascular disease. The relationship between MC and HCV infection has prompted the use of antiviral therapy. Two patients with chronic HCV infection, type-II MC and membranoproliferative glomerulonephritis (MPGN), presenting as nephrotic syndrome were treated with interferon (IFN)-alpha (3 MU 3 times per week) and ribavirin (15 mg/kg daily) for 6 months. Laboratory tests included measurement of anti-HCV antibodies, HCV RNA, and HCV genotyping, and characterization of circulating cryoglobulins. A pretreatment renal biopsy was performed, and the histopathologic lesions were scored according to the index of disease activity. Viremia and cryoglobulinemia were suppressed in both patients. However, a complete remission of proteinuria was observed in 1 patient only. The evaluation of the renal biopsy specimens revealed a mild MPGN (activity score: 5/24) in the patient with remission of proteinuria and a severe MPGN (activity score: 15/24) in the patient who maintained a nephrotic-range proteinuria. Although a fully satisfactory treatment is not yet available, we feel that a reasonable therapeutic strategy for HCV-infected patients with MC nephritis could be as follows: (1) antiviral treatment alone for patients with a low-grade kidney involvement, and (2) a short-term course of steroids and cytotoxic drugs followed by antiviral therapy for acute exacerbations and/or rapidly progressive GN.
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