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Achillion Announces Positive Proof-of-Concept Data With ACH-3102

- Second-Generation Pan-Genotypic NS5A Inhibitor Achieves Potent Antiviral Activity of Mean Maximum 3.74 Log 10 Reduction Following a Single Dose - - Initiated Enrollment in a Phase 2 Clinical Trial Evaluating ACH-3102 Plus Ribavirin for the Treatment of HCV Genotype 1b -

- Hosting Analyst Day Today With Live Webcast Beginning at 1:00 p.m. ET -

NEW HAVEN, Conn., Sept. 27, 2012 (GLOBE NEWSWIRE) -- Achillion Pharmaceuticals, Inc. (Nasdaq:ACHN) today announced positive proof-of-concept results with ACH-3102, a second-generation pan-genotypic NS5A inhibitor being developed for the treatment of chronic hepatitis C viral infections (HCV). Administration of a single-dose of ACH-3102 to genotype (GT) 1a HCV-infected subjects resulted in a mean maximum 3.74 log 10 reduction in HCV RNA (range 2.9 – 4.6 log 10). Significant reductions in HCV RNA were achieved in subjects with resistant variants at baseline, including L31M and Y93C variants.

Based on these data, combined with safety and tolerability results from the Phase 1a trial in healthy subjects evaluating up to 14 days of ACH-3102, Achillion has initiated a pilot Phase 2 clinical trial evaluating ACH-3102 in combination with ribavirin for the treatment of patients with chronic GT 1b HCV.

"We believe these proof-of-concept results demonstrate the differentiation of ACH-3102 from first-generation NS5A inhibitors. The potency of ACH-3102 was successfully shown against genotype 1a, historically the hardest to treat HCV subtype," commented Michael Kishbauch, President and Chief Executive Officer of Achillion. "Furthermore, we believe the enhanced resistance profile of ACH-3102 observed in vitro has been validated in the clinic with robust antiviral activity against baseline mutations such as L31M. These results support our belief that this second-generation pan-genotypic NS5A inhibitor has the potential to become a cornerstone compound."

ACH-3102: Phase 1 Program

In May 2012, Achillion initiated a Phase 1a clinical trial evaluating the safety and tolerability of single and multiple ascending doses of ACH-3102 in healthy volunteers. To date, 42 healthy volunteers have received a single dose of ACH-3102, ranging from 25 mg to 1,000 mg. An additional 32 healthy volunteers have received 14 days of ACH-3102 once-daily evaluating various dosing regimens. Preliminary data from the single and multiple ascending dose groups demonstrated that ACH-3102 was well tolerated at all doses evaluated. There were no serious adverse events and no clinically significant changes in vital signs, electrocardiograms (ECGs), or laboratory evaluations. All reported adverse events were classified as mild or moderate and were transient in nature.

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