Direct-acting antivirals for acute hepatitis C in HIV-infected MSM.

Abstract

An epidemic of acute hepatitis C (AHC) has been described amongst HIV-infected MSM [1–8]. Traditionally, treating AHC in this population has had clear advantages over waiting to treat in the chronic phase, with improved sustained virological response (SVR) rates and reduced length of therapy [9–12]. Treatment is offered to those who fail to demonstrate a 2 log decline at week 4 or still have detectable hepatitis C virus (HCV) RNA at week 12 and hence are unlikely to clear spontaneously [13]. The treatment of chronic HCV has been revolutionized by the advent of directly acting antivirals (DAAs) [14]. However, the role of these agents in AHC is unclear, particularly in light of the now-excellent efficacy in chronic infection. Guidelines still recommend therapy with pegylated interferon and ribavirin, and DAAs are not currently licensed for AHC [9,15]. Nonetheless, we have encountered several cases in which we have felt the use of DAAs warranted for AHC. The demographics and essentials of the HIV and AHC history of these patients are presented in Table 1.Table 1: Demographics, HIV, acute hepatitis C history and therapy for four patients treated with directly acting antivirals for acute hepatitis C.Patient 1 was monitored for 4 weeks, failed to reduce his viral load by 2 log and was thus considered for AHC therapy. He had a background of depression and was a healthcare professional in an important role. Two companies were therefore approached to access an all-oral, interferon-free DAA regimen, as DAAs were not licensed at this time, both of whom agreed to provide medication. Patient 2 presented with evidence of hepatic failure, with deranged clotting and low albumin, which failed to resolve after more than 10 days of supportive inpatient therapy. Similarly, although patient 4 had initially normal synthetic function, after a week he developed hepatic failure. Given the clinical severity and, in the case of patient 2, background of depression, we aimed to avoid interferon-based therapy and obtained access to DAAs. Patient 3 was concerned about transmission risk, keen to initiate therapy and had access to DAAs privately. All patients were commenced on Harvoni, a fixed dose combination of 90 mg of the NS5A inhibitor ledipasvir and 400 mg of the nucleotide analogue NS5B polymerase inhibitor sofosbuvir, once per day. Length of therapy and the addition (or otherwise) of ribavirin was based on current understanding of the length of therapy required for AHC at the time of treatment initiation, HCV RNA viral load and evidence of underlying liver disease; with patient 1 (low viral load, no underlying liver disease and prior to evidence for the possible efficacy of shorter courses [16]) receiving 12 weeks of Harvoni alone, patients 2 and 4 (high viral load and evidence of underlying liver disease on the basis of Fibroscan or liver biopsy) commencing 12 weeks of Harvoni and ribavirin and patient 3 (modest viral load, no underlying liver disease and after publication of evidence for the possible efficacy of shorter courses [16]) receiving only 8 weeks of Harvoni. Three patients (1, 2 and 4) were receiving protease inhibitor therapy for their HIV infection at the time of the AHC diagnosis. To minimize any potential drug–drug interactions and reduce any liver toxicity, patients 1 and 2 had their HIV therapy switched to integrase inhibitor based therapy (Truvada and Raltegravir in the case of patient 1 and Triumeq, after a 3-week pause to allow liver function test recovery, in the case of patient 4). Patient 2 had extensive previous antiretroviral exposure and current hepatic failure, and hence antiretrovirals were discontinued until complete normalization of liver function tests and completion of DAA therapy, at which point, the same antiretrovirals were recommenced. Patient 3 was receiving an non-nucleoside reverse-transcriptase inhibitor-based regimen and had only a modest alanine transaminase (ALT) rise and hence remained on the same antiretrovirals throughout. Aside from patient 2, who had to discontinue ribavirin after 2 weeks due to nausea, all patients had an uncomplicated follow-up, requiring only three to five short visits. Liver function tests and HCV RNA monitoring were variable and dictated by clinical need, all patients had no detectable HCV RNA and normal ALT by week 8, and those with lower baseline HCV RNA became undetectable sooner. Patients 1, 2 and 4 have achieved an SVR12, and patient 3 has achieved an SVR4. The optimum regimen and duration of therapy for AHC are unclear, particularly in the light of recent, poorer than expected results, for both 6- and 12-week regimens of sofosbuvir and ribavirin [17,18]. However, our experience offers proof of principle for well tolerated, all-oral DAA therapy with Harvoni (with and without ribavirin) across a range of clinical situations and with minimal follow-up.