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© Research
Publication : Antiviral therapy

Randomized study of asunaprevir plus pegylated interferon-α and ribavirin for previously untreated genotype 1 chronic hepatitis C

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Antiviral therapy - 26 Jun 2013

Bronowicki JP, Pol S, Thuluvath PJ, Larrey D, Martorell CT, Rustgi VK, Morris DW, Younes Z, Fried MW, Bourlière M, Hézode C, Reddy KR, Massoud O, Abrams GA, Ratziu V, He B, Eley T, Ahmad A, Cohen D, Hindes R, McPhee F, Reilly B, Mendez P, Hughes E

Link to Pubmed [PMID] – 23804631

Antivir. Ther. (Lond.) 2013;18(7):885-93

BACKGROUND: Asunaprevir is a selective NS3 protease inhibitor with in vitro activity against HCV genotypes 1 and 4.

METHODS: In this Phase IIa double-blind study, treatment-naive HCV genotype-1-infected patients in the United States and France were randomly assigned 1:1:1:1 to placebo or asunaprevir 200 mg twice daily, 600 mg twice daily or 600 mg once daily in combination with pegylated interferon (PEG-IFN)-α2a and ribavirin for 48 weeks. The primary efficacy end point was undetectable HCV RNA at weeks 4 and 12 (extended rapid virological response [eRVR]). Other end points included safety and undetectable HCV RNA at 24 weeks post-treatment (24-week sustained virological response [SVR24]).

RESULTS: A total of 47 patients were randomized and treated. eRVR was achieved by 75% (9/12), 75% (9/12) and 92% (11/12) of patients in the asunaprevir 200 mg twice-daily, 600 mg twice-daily and 600 mg once-daily groups, respectively, versus 0% (0/11) in the placebo group. Corresponding SVR24 rates were 83% (10/12), 83% (10/12) and 92% (11/12) in the asunaprevir groups and 46% (5/11) in the placebo group. There was no virological breakthrough in any asunaprevir group. Following the 12-week analysis, the 600 mg doses were reduced to 200 mg twice daily because of a greater frequency of transaminase elevations at the 600 mg dose. The most common grade 3-4 laboratory abnormalities were consistent with those reported for PEG-IFN and ribavirin.

CONCLUSIONS: Asunaprevir plus PEG-IFN and ribavirin achieved higher response rates than placebo plus PEG-IFN and ribavirin, with a tolerable adverse event profile at the 200 mg twice-daily dose. This dose is being evaluated in the Phase IIb and Phase III studies.