AASLD 2014: Sofosbuvir/Ledipasvir Cures Nearly All Genotype 1 HIV/HCV Coinfected Patients

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All but 1 participant treated with a coformulation of sofosbuvir and ledipasvir (Harvoni) achieved sustained virological response at 12 weeks post-treatment in a study looking at traditionally hard-to-treat HIV/HCV coinfected patients, researchers reported at the American Association for the Study of Liver Diseases (AASLD) Liver Meeting this week in Boston.

Sofosbuvir/ledipasvir -- a combination nucleotide HCV polymerase inhibitor and NS5A inhibitor produced by Gilead Sciences -- has performed very well in Phase 3 clinical trials, leading to its recent approval by the U.S. Food and Drug Administration. But such studies, usually sponsored by drug-makers, may not reflect the range of difficult-to-treat patients seen in real-world clinical practice.

The ERADICATE trial, an investigator-initiated study conducted by the National Institute of Allergy and Infectious Diseases, was designed to test a simple once-daily regimen for an urban population in Washington, DC.

This analysis included 50 HIV/HCV coinfected participants with HCV genotype 1, about 80% of whom had harder-to-treat subtype 1a. All participants were being treated for hepatitis C for the first time. A majority were men, more than 80% were African-American, and the median age was 58 years. Most had high HCV viral load. About one-quarter had advanced liver fibrosis (stage F3), but people with cirrhosis (stage F4) were excluded.

Participants had well-preserved immune function without signs of AIDS. 13 patients were not yet taking antiretroviral therapy (ART) and had either a stable CD4 T-cell count and HIV RNA below 500 copies/mL or a CD4 cell count greater than 500 cells/mm3 (median 687 cells/mm3). The other 37 were on ART with undetectable HIV RNA and a median CD4 count of 576 cells/mm3. Everyone on ART was taking tenofovir/emtricitabine (the drugs in Truvada), mostly with efavirenz (Sustiva; 41%), raltegravir (Isentress; 27%), or rilpivirine (Edurant; 21%) as their third antiretroviral.

Historically, people with HIV/HCV coinfection and people of African descent have not responded as well to interferon-based therapy for hepatitis C. Immune deficiency related to HIV may interfere with response to interferon, and black people are less likely to have the favourable IL28B CC genetic variant associated with good interferon responsiveness (about 85% in this study had unfavourable IL28B variants). But HIV infection and race/ethnicity do not seem to have much effect on interferon-free treatment.

All participants in this open-label study were treated with coformulated sofosbuvir/ledipasvir (400 mg/90 mg) for 12 weeks, and were followed for 24 weeks after the end of treatment.

Anu Osinusi from NIAID presented interim results from ERADICATE at the EASL International Liver Congress in April. At AASLD, Shyam Kottilil presented final results for the primary endpoint of stained virological response, or continued undetectable HCV RNA, at 12 weeks after completing treatment (SVR12), considered to be a cure.

Results

"Treatment of chronic hepatitis C in HCV/ HIV coinfected patients with sofosbuvir/ledipasvir was effective and well-tolerated, suggesting HIV infection may not be a major determinant of treatment outcome with sofosbuvir/ ledipasvir therapy," the researchers concluded.

11/9/14

Reference

KS Townsend, A Osinsi, AK Nelson, S Kottilil, et al. High Efficacy of Sofosbuvir/Ledipasvir for the Treatment of HCV Genotype 1 in Patients Coinfected With HIV on or off Antiretroviral therapy: Results from the NIAID ERADICATE Trial. American Association for the Study of Liver Diseases (AASLD) Liver Meeting. Boston, November 7-11, 2014. Abstract 84.