Retreatment of Hepatitis C Infection With Direct-Acting Antivirals
Background: Treatment of hepatitis C virus (HCV) infection with direct-acting antivirals (DAAs) results in sustained virologic response (SVR) in > 90% of patients. However, some patients required retreatment with newer DAA options. Treatment was selected after consultation with a clinical pharmacy specialist.
Methods: A retrospective chart review of patients at the West Palm Beach Veterans Affairs Medical Center (WPBVAMC) in Florida retreated from January 2015 to December 2019 was conducted. Data collected included HCV genotype, previous therapy, newly prescribed medications, and treatment outcomes.
Results: Since 2015, > 900 patients have been treated at WPBVAMC, including 22 patients who had previously failed interferon combined with DAA regimens and 46 patients who needed retreatment after failure with an all-oral therapy. This review documents the outcomes of retreatment with DAA after initial failure to achieve SVR Of 28 patients treated with a boceprevir-based regimen, 10 ended in failure. All 10 were retreated, and all achieved SVR with ledipasvir/sofosbuvir. Of 53 patients treated with a sofosbuvir-based interferon regimen, 12 failed treatment. All 12 were retreated and all achieved SVR. Thirty patients were retreated after failure with an all-oral DAA. Of 27 tested, 21 achieved SVR. All patients who failed therapy again had cirrhosis.
Conclusions: Veterans retreated with DAAs for HCV infection had a high success rate. Repeat failures of DAAs were rare, but cirrhosis seems to be common among these patients.
Patients who failed therapy primarily had GT1—the most prevalent GT treated. A higher prevalence of GT1 is expected since it is the most common GT in the US.6 However, disease progression occurs more rapidly in those with GT3 and is more difficult to treat.22 The overall response rate was lower with this GT (83%) in this report, with only 1 of 3 patients retreated achieving an SVR.
Similar results are documented in retreatment trials.23 In the POLARIS-1 trial, treatment with SOF/VEL/VOX resulted in an overall response rate of 96% but only 91% for patients with GT3, compared with 95 to 100% for GTs 1, 2, or 4.23 In the current report, only 1 patient (GT1) failed retreatment with SOF/VEL/VOX. At this time, there are no clear treatment options for this patient. However, patients who fail GLE/PIB (none so far in the current report) may be able to receive SOF/VEL/VOX.24 In a small study, 29 of 31 patients achieved SVR with SOF/VEL/VOX after GLE/PIB failure (12 of 13 GT1 and 17 of 18 GT3).24
Limitations
This review was an observational, nonrandomized design, and only 1 medical center was involved. These results may not be applicable to other patient populations without a clinic set up with routine follow-ups to encourage adherence and completion of therapy.
Conclusions
Treatment of HCV infection has improved significantly over the past 10 years. Use of DAAs results in SVR for > 90% of patients, especially if the disease had not progressed to cirrhosis. Failure after retreatment for HCV infection was rare as well. Given that cirrhosis seems to increase the chance of treatment failure, it is imperative to identify candidates for treatment before the infection has progressed to cirrhosis. Patients infected with GT3 in particular should be more aggressively identified and treated.
Acknowledgments
The authors thank Nick P. Becky, PharmD, for his contributions to the identification of patients needing treatment for their HCV infection and review of initial manuscript information.
