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DAAs resulted in high rates of SVR in patients with cryoglobulinemia. Safety and tolerability were excellent; however, most patients did not have a complete clinical or immunological response, suggesting a delay to clinical response particularly in those with severe/life-threatening vasculitis. Further follow-up will be required to determine if clinical improvement continues after viral clearance.

Mixed cryoglobulins are detected in 50% of patients with hepatitis C; fortunately, few have vasculitis affecting skin, peripheral nerves, kidneys, and synovia. This study was designed to identify the natural history of symptomatic cryoglobulinemia and evaluate the response to antiviral therapy. Patients with hepatitis C complicated by symptomatic cryoglobulinemia were assessed for their disease manifestations and response to antiviral therapy. Of 83 patients identified, 56 patients with a minimum of 12 months follow-up were reviewed. Manifestations included dermatologic (75%), rheumatologic (57%), neurologic (34%), and renal (proteinuria 25%). Antiviral therapy was given to 38, of whom 9 were retreated for symptomatic and/or virological nonresponse. Antiviral therapy included interferon monotherapy (n = 8), pegylated-interferon monotherapy (n = 5), consensusinterferon (n = 2), interferon + ribavirin (n = 18), and pegylated-interferon + ribavirin (n = 14). Treatment provided sustained symptomatic response in 31 (82%) and virological response in 16 (42%) patients. Symptomatic cryoglobulinemia responds well to antiviral therapy, even when virological response is not achieved.

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