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Objectives Oral lichen planus (OLP) is a chronic inflammatory mucocutaneous disease. Literature supports an association between OLP and Hepatitis C virus (HCV) infection. The current treatment for HCV infection with direct-acting antivirals (DAAs) is highly effective and safe. The aim of this study is to evaluate the clinical impact of viral eradication with DAAs in patients with HCV and OLP. Materials and methods For this cohort observational study, 18 patients with HCV and OLP were recruited; all patients received DAAs. Nineteen patients with OLP without HCV were recruited as controls. Both groups received an oral clinical examination, taking photographs of the oral mucosa, at three time points. Size and type of lesions, clinical and efficacy scores, were evaluated at each time point with ImageJ software. Changes were assessed by a general linear model repeated measures analysis. Kruskal–Wallis H and Mann–Whitney U tests were used to evaluate the differences between subgroups. Results All patients of the study group reached a sustained virological response. The study group showed a correlation between viral load and clinical status (p &lt; 0.05), higher clinical scores at baseline (p = 0.001) and higher efficacy index than controls (p &lt; 0.001), improving over time (p &lt; 0.001); controls did not show significant changes (p = 0.196). One patient of the experimental group developed oral squamous cell carcinoma (OSCC) of the tongue during the DAAs treatment. Conclusions In this study, patients with HCV and OLP showed a worst clinical oral status than controls at baseline. However, treatment for virus eradication can improve the oral lichen planus clinical course. Clinical relevance HCV eradication can improve the clinical course of patients with HCV-related OLP.

The clinical impact of direct-acting antiviral treatment on patients affected by hepatitis C virus-related oral lichen planus: a cohort study