AbbVie releases Phase 3 results from all-oral OBV/PTV/r treatment for GT1b chronic HCV infection

AbbVie (NYSE: ABBV) released top-line Phase 3 results for its investigational, all-oral, ribavirin (RBV)-free, two direct-acting antiviral treatment with ombitasvir/paritaprevir/ritonavir (OBV/PTV/r) in patients with genotype 1b (GT1b) chronic hepatitis C virus (HCV) infection in Japan. The primary endpoint of the GIFT-I study was achieved, demonstrating a 95 percent (n=106/112) sustained virologic response rate at 12 weeks post treatment (SVR₁₂) in the sub-group of previously untreated, non-cirrhotic adult GT1b Japanese patients who were eligible for therapy with interferon (IFN) and had a high viral load.

"AbbVie is committed to advancing HCV care with the goal of evaluating our treatment in a broad range of patients around the world," said Scott Brun, M.D., vice president, pharmaceutical development, AbbVie. "The GIFT-I results are encouraging and support moving forward with our Japan development program, with a local regulatory submission anticipated in the first quarter of 2015."

In Japan, up to two million people are currently living with hepatitis C. Genotype 1b is the most common sub-genotype, affecting nearly half of the people infected with HCV.

In the GIFT-I study, the primary efficacy population comprised a sub-group of treatment-naive GT1b chronic HCV infected patient population. This sub-group consisted of treatment-naive patients without cirrhosis who were eligible for therapy with IFN with or without RBV, had a high viral load (> 100,000 IU/mL) and received at least one dose of the double-blind active study drug. The primary endpoint was assessed at 12 weeks post treatment (SVR₁₂).

In patients without cirrhosis, the most commonly reported adverse events in the treatment arm were nasopharyngitis (16.7 percent OBV/PTV/r vs. 13.2 percent placebo), headache (8.8 percent OBV/PTV/r vs. 9.4 percent placebo), and oedema peripheral (5.1 percent OBV/PTV/r vs. 0 percent placebo). Two patients without cirrhosis (0.9 percent) discontinued treatment due to adverse events.

Within the primary efficacy patient population, there were no on-treatment virologic failures and 2.8 percent of patients (n=3/109) experienced relapse.

AbbVie will disclose detailed GIFT-I study results at future scientific congresses and in publications.