Number and percentage of patients reporting treatment-emergent adverse events were tabulated by Medical Dictionary for Regulatory Activities (MedDRA) System Organ Class and preferred term. Tabulations of treatment-emergent selleckchem adverse events were also provided by severity rating and relationship to study drug. All adverse events reported from the time of study drug administration until 30 days following discontinuation of study drug administration were collected. Serious adverse events were collected from the time the patients signed the informed consent through the 48-week

post-treatment period. The primary endpoint in this exploratory study was the percentage of patients with HCV RNA suppressed below LLOQ from week 4 through week 12. Secondary endpoints included percentage of patients with sustained virologic response (HCV RNA < LLOQ) at 12 weeks post-treatment (SVR12) and percentage of patients with sustained virologic response at 24 weeks post-treatment (SVR24). Demographic, safety, and efficacy analyses were performed on all patients who received at least one dose of study drug.

All statistical tests and confidence intervals were 2-sided with an Bleomycin in vitro α level of 0.05. SAS for the UNIX operating system was used for all analyses. For analysis of adverse events, Arms 1 and 2 were compared using Fisher’s exact test. This study is registered with ClinicalTrials.gov, Histone demethylase number NCT01458535. One hundred forty patients were screened and 61 patients were enrolled in the study. Commonly occurring reasons for exclusion included: (a) an abnormal laboratory result at screening, (b) an exclusionary FibroTest score or Aspartate Aminotransferase to Platelet Ratio, and (c) the appropriate cohort for the study patient was already fully enrolled. All enrolled patients received at least 1 dose of study drug (Fig. 1). Baseline

characteristics were generally well-balanced between cohorts of the same genotype (Table 1). Phylogenetic analysis indicated that the HCV subgenotype designation for all patients was accurate (Supplemental Fig. 1). On-treatment and post-treatment virology results for each individual patient are shown in Supplemental Fig. 2. Virologic response rates are presented in Table 2. Among patients in Arm 1 (ombitasvir and ABT-450/r with RBV) HCV RNA was suppressed below LLOQ from week 4 through 12 in 10 (100%; 95% CI, 69–100) HCV genotype 1-infected patients, 9 (90%; 95% CI, 56–100) HCV genotype 2-infected patients, and 7 (70%; 95% CI, 35–93) HCV genotype 3-infected patients. Among patients in Arm 2 (ombitasvir and ABT-450/r without RBV) HCV RNA was suppressed below LLOQ from week 4 through 12 in 9 (90%; 95% CI, 56–100) HCV genotype 1-infected patients, 8 (80%; 95% CI, 44–97) HCV genotype 2-infected patients, and 2 (18%; 95% CI, 2–52) HCV genotype 3-infected patients.