Impact of Direct-Acting Antivirals on Extrahepatic Manifestations in Chronic Hepatitis C: A Narrative Review with a Hermeneutic Approach.

Background/Objectives: Chronic hepatitis C virus (HCV) infection is associated with a wide spectrum of extrahepatic manifestations, involving the immune, dermatologic, endocrine, vascular, and neuropsychiatric systems. Among these, mixed cryoglobulinemic vasculitis (CryoVas) remains one of the most clinically relevant complications. This work aims to provide a structured overview of HCV-related extrahepatic conditions and to analyze the clinical and virological outcomes of direct-acting antivirals (DAAs) in CryoVas patients. Methods: We first categorized and reviewed extrahepatic manifestations of HCV across five major domains: immune, inflammatory/metabolic/vascular, dermatological, thyroid, and neuropsychiatric. Subsequently, we conducted a comparative analysis of five clinical studies evaluating the impact of DAA therapy in patients with CryoVas. Data on demographics, clinical symptoms, treatment regimens, sustained virological response, and clinical response were extracted and summarized. Results: HCV was found to be associated with numerous extrahepatic conditions, including mixed cryoglobulinemia, non-Hodgkin lymphoma, autoimmune thyroiditis, insulin resistance, and neurocognitive symptoms. In the CryoVas subgroup analysis, virological response rates were uniformly high (88.9-100%), but clinical remission varied significantly. Complete response ranged from 39% to 90%, highlighting a discrepancy between viral eradication and extrahepatic symptom resolution. These findings underscore the need for individualized follow-up and further investigation into persistent immunological dysfunction post-sustained virological response (SVR). However, clinical outcomes were more variable: complete response (CR) varied between 39% and 90%, partial response (PR) ranged from 4% to 42%, and no response (NR) was reported in 0% to 40% of cases. Although significant improvement in key manifestations such as purpura, arthralgia, and neuropathy was frequently observed, a subset of patients continued to exhibit residual or refractory symptoms despite achieving SVR. Conclusions: HCV infection exerts multisystemic effects that extend beyond liver pathology. While DAAs offer near-universal virological clearance, the heterogeneous clinical response in CryoVas underscores the need for closer monitoring of extrahepatic outcomes. Future research should assess whether combining DAAs with immunomodulatory strategies can improve symptom control and long-term outcomes in patients with severe or refractory CryoVas.