Achillion's Odalasvir with Sofosbuvir Cured Hepatitis C in 6-8 Weeks in Phase 2 Study

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Achillion Pharmaceuticals' experimental NS5A inhibitor odalasvir (ACH-3102) plus Gilead Science's sofosbuvir (Sovaldi), taken without ribavirin, produced sustained virological response at 12 weeks post-treatment in all previously untreated genotype 1 hepatitis C patients treated for 6 or 8 weeks in a small Phase 2 study, according to a recent company announcement. Treatment was safe and well-tolerated.

Earlier results from the Proxy Study were presented at last year's AASLD Liver meeting. In this study sofosbuvir is acting as a stand-in for Achillion's own investigational nucleotide HCV polymerase inhibitor, ACH-3422. Current standard therapy includes sofosbuvir plus Gilead's NS5A inhibitor ledipasvir (together in the Harvoni coformulation) taken for 12 weeks, though 8 weeks is adequate for some easier-to-treat patients.

Below is an edited excerpt from an Achillion press release describing the study and its findings in more detail.

Achillion Reports 100% SVR12 From Second Cohort of Patients in the Previously-Completed Six Week Phase 2 Trial Evaluating Odalasvir (ACH-3102) and Sofosbuvir for Genotype 1 HCV ("Proxy Study")

-- 100% SVR12 reported for all patients treated for six- (n=18) or eight-weeks (n=12)

-- Odalasvir (ACH-3102) is the subject of an exclusive, worldwide development and commercialization license granted to Janssen

New Haven, Conn. -- September 17, 2015 -- Achillion Pharmaceuticals, Inc. (Nasdaq:ACHN) today announced additional interim results from a Phase 2 study evaluating odalasvir (also known as ACH-3102), a NS5A inhibitor, in combination with sofosbuvir, without ribavirin, for either six or eight weeks of treatment in patients with treatment-naive genotype 1 chronic hepatitis C virus (HCV) infection. Of the patients treated for six weeks in this cross-over cohort, 100 percent (n=6/6) remained HCV RNA undetectable twelve weeks after completing therapy (SVR12). Previously, Achillion reported results from this study including 100 percent SVR24 for the initial cohorts including 12 patients treated for eight weeks and 100 percent SVR24 for 12 patients treated for six weeks.

In May 2015, Achillion announced it had granted Janssen Pharmaceuticals, Inc. (Janssen), one of the Janssen Pharmaceutical Companies of Johnson & Johnson, an exclusive, worldwide license to develop and, upon regulatory approval, commercialize HCV products and regimens containing one or more of Achillion's HCV assets which include odalasvir, ACH-3422, and sovaprevir.

ACH-3102 - 017: Phase 2 pilot study evaluating six- and eight-weeks of treatment in combination with sofosbuvir for genotype 1 treatment-naive HCV

Achillion conducted a Phase 2, open-label, randomized, partial-crossover study to evaluate the efficacy, safety, and tolerability of eight weeks or six weeks of odalasvir and sofosbuvir, a marketed nucleotide polymerase inhibitor, without ribavirin, in treatment-naive genotype 1 HCV-infected patients. The primary objective of the study was determination of sustained viral response 12 weeks (SVR12) after the completion of therapy. Eighteen patients were initially enrolled, including six observational patients (group 1). Twelve patients completed eight weeks of treatment consisting of 50 mg of odalasvir and 400 mg of sofosbuvir administered once daily while observational patients received no drug during this phase of the trial. Ten of the 12 patients receiving eight weeks of treatment had genotype 1a HCV. At baseline, the median HCV RNA was 7.15 log10 (range 5.5- 7.8 log10). Of the 12 patients, 100 percent achieved SVR24. Odalasvir and sofosbuvir were well tolerated with no significant adverse events, ECG findings, or lab abnormalities observed during treatment.   

Following achievement of the pre-specified response rate of 100 percent, the six observational patients plus six additional patients (group 2) were enrolled and received six weeks of treatment consisting of 50 mg of odalasvir and 400 mg of sofosbuvir administered once daily. Median HCV RNA at baseline was 6.95 log10 (range 6.2-8.0 log10) and six patients had GT 1a HCV. Of the 12 patients, 100 percent achieved SVR24.

Six additional rollover patients (group 3), enrolled into the final cohort, also received six weeks of treatment consisting of 50 mg of odalasvir and 400 mg of sofosbuvir administered once daily. Baseline characteristics included five of six patients with genotype 1a HCV, four of six patients with non-CC IL28B (two patients with IL28B TT), and a median baseline HCV RNA of 6.32 log10 IU/ml (range 6.0-7.3 log10 IU/ml). In all, a total of 18 patients (group 2 and 3) received six weeks of treatment and all subjects, 100 percent, achieved SVR12.

About the Achillion Worldwide HCV Collaboration with Janssen

On May 19, 2015, Achillion announced it had granted Janssen Pharmaceuticals, Inc. (Janssen), one of the Janssen Pharmaceutical Companies of Johnson & Johnson, an exclusive, worldwide license to develop and, upon regulatory approval, commercialize HCV products and regimens containing one or more of Achillion's HCV assets which include odalasvir (ACH-3102), ACH-3422, and sovaprevir. A key objective of the collaboration is to develop a short-duration, highly effective, pan-genotypic, oral regimen for the treatment of HCV. Achillion announced on August 3, 2015 that Alios Biopharma Inc., part of the Janssen Pharmaceutical Companies (Janssen) had initiated a Phase 1 clinical trial to evaluate the potential effect of simeprevir and odalasvir on the pharmacokinetics of AL-335 in healthy volunteers. Janssen previously stated its goal of initiating Phase 3 development with a triple regimen for HCV by early 2017.

About Achillion Pharmaceuticals

Achillion is seeking to apply its expertise in biology and structure-guided design and a deep understanding of patient and clinician needs to develop innovative treatment solutions aimed at improving patients' lives. Achillion believes that its scientific excellence, integrated capabilities and experienced team position it to successfully achieve its goal of advancing new products along the entire continuum from the bench to the patient. Achillion's pipeline is currently focused on small molecule therapeutics for infectious disease and complement-related diseases. www.achillion.com.

9/25/15

Source

Achillion Pharmaceuticals. Achillion Reports 100% SVR12 From Second Cohort of Patients in the Previously-Completed Six Week Phase 2 Trial Evaluating Odalasvir (ACH-3102) and Sofosbuvir for Genotype 1 HCV ("Proxy Study"). Press release. September 17, 2015.