In an additional intent-to-treat (ITT) analysis, SVR₁₂ was achieved in 98 percent (n=104/106) of the GT1b HCV infected patients without cirrhosis (Arm B) who were randomized to initially receive double-blind placebo for 12 weeks, followed by open-label treatment with ombitasvir/paritaprevir/ritonavir.¹ The ITT population included every patient that was randomized to placebo and received at least one dose of active, open-label study drug.

"It is critical to address the burden of hepatitis C in Japan, with GT1b being the most prevalent sub-type of the disease in the country," said Kazuaki Chayama, M.D., Ph.D, professor and head of the Department of Gastroenterology and Metabolism, Graduate School of Biomedical and Health Sciences, Hiroshima University. "GIFT-I shows the potential of this treatment to achieve high SVR rates for Japanese patients with GT1b hepatitis C, including those with compensated cirrhosis."

Across all study arms, three patients (n=3/363) discontinued treatment due to adverse events.¹ The most commonly reported adverse events (>5 percent in any arm) were nasopharyngitis, headache, peripheral edema, nausea, pyrexia and decreased platelet count.¹

"We are pleased to present full results from GIFT-I, which provide further insight into our hepatitis C treatment currently under priority review by the Japanese health authorities," said Scott Brun, M.D., vice president, pharmaceutical development, AbbVie. "We know physicians weigh the risks and benefits of HCV treatments for their patients as they look for an option that offers a potential cure. These data will help guide clinicians in their decision making and support AbbVie's goal of bringing an interferon- and ribavirin-free treatment to people living with genotype 1 hepatitis C in Japan."

In Japan, approximately 1.5 to 2 million people are living with HCV.² Genotype 1 is the most common HCV genotype inJapan with 60 to 70 percent of patients infected and, of those, about 95 percent are infected with the GT1b sub-type.³AbbVie studied its two direct-acting antiviral treatment regimen without RBV in Japan due to patient and viral characteristics specific to the Japanese population, including high prevalence of GT1b.

AbbVie's investigational, two direct-acting antiviral treatment consists of ombitasvir/paritaprevir/ritonavir and is currently under priority review by the Japanese Ministry of Health, Labour and Welfare.

About GIFT-I Study 
GIFT-I comprises 363 patients in two sub-studies. In sub-study 1, 321 genotype 1b (GT1b) patients without cirrhosis, both treatment-naïve and interferon (IFN) [with or without ribavirin (RBV)] treatment-experienced, were randomized to receive either ombitasvir/paritaprevir/ritonavir (Arm A) [OBV/PTV/r] or placebo (Arm B) [2:1 randomization ratio, stratified by treatment history, past response, viral load and IFN eligibility]. Patients initially randomized to placebo (Arm B) then received OBV/PTV/r for an additional 12 weeks of open-label treatment. Sustained virologic response was assessed 12 weeks post-treatment (SVR₁₂) as a primary efficacy endpoint in a sub-group of previously untreated, non-cirrhotic GT1b patients who were eligible for therapy with IFN and had a high viral load, defined as an HCV RNA level ≥ 100,000 IU/mL and received at least one dose of the double-blind, active study drug.¹

In sub-study 2, 42 GT1b treatment-naïve and IFN (with our without RBV) treatment-experienced patients with compensated cirrhosis received open-label treatment for 12 weeks (Arm C) with SVR₁₂ and assessed as a secondary efficacy endpoint.¹

One patient from each arm (n=3/363) experienced on-treatment virologic failure [Arm A, 0.5% (n=1/215); Arm B, 0.9% (n=1/106); Arm C, 2.4% (n=1/42)].¹ Across all arms, eight patients (n=8/354) experienced post-treatment relapse [Arm A, 2.4% (n=5/209); Arm B, 1.0% (n=1/105); Arm C, 5.0% (n=2/40)].¹  

About AbbVie's Investigational Two Direct-Acting Antiviral HCV Treatment
For the treatment of genotype 1 chronic hepatitis C virus (HCV) infection in Japan, AbbVie's investigational, two direct-acting antiviral treatment consists of the fixed-dosed combination of paritaprevir/ritonavir (150/100 mg) with ombitasvir (25 mg), dosed once daily.

AbbVie's chronic HCV treatment combines two direct-acting antivirals, each with a distinct mechanism of action that targets and inhibits specific HCV proteins of the viral replication process.

About AbbVie's HCV Clinical Development Program in Japan
AbbVie's HCV clinical development program in Japan focuses on our investigational, two direct-acting antiviral treatment and is designed with the goal of achieving high SVR rates in chronic HCV infected patients, including additional genotypes and patients with compensated cirrhosis.

Paritaprevir was discovered during the ongoing collaboration between AbbVie and Enanta Pharmaceuticals (NASDAQ: ENTA) for HCV protease inhibitors and regimens that include protease inhibitors. Paritaprevir has been developed by AbbVie for use in combination with AbbVie's other investigational medicines for the treatment of hepatitis C.

Ombitasvir/paritaprevir/ritonavir is an investigational product and its safety and efficacy have not been established inJapan.

Additional information about AbbVie's clinical development program in Japan can be found on www.clinicaltrials.gov.