Pharmasset Receives Notice of Allowance
Thursday June 26, 7:00 am ET
-USPTO to grant patent covering the anti-HCV drug PSI-6130 and its active metabolites
PRINCETON, N.J., June 26 /PRNewswire-FirstCall/ -- Pharmasset, Inc. (Nasdaq: VRUS - News) announced that the United States Patent and Trademark Office has issued a Notice of Allowance for patent application Serial No. 10/828,753 titled, "Modified Fluorinated Nucleoside Analogues," covering the composition of matter of a family of molecules invented at Pharmasset for the treatment of hepatitis C virus (HCV), including PSI-6130 and the active metabolite of PSI-7851. R7128, a prodrug of PSI-6130, a nucleoside analogue polymerase inhibitor of HCV, is being developed through Pharmasset's collaboration with Roche. PSI-7851 is a proprietary nucleotide analogue polymerase inhibitor of HCV that Pharmasset has nominated as a lead development candidate.
"We are pleased that the USPTO has recognized our intellectual property rights in our growing pipeline of HCV nucleoside polymerase inhibitors," stated Schaefer Price, Pharmasset's Chief Executive Officer. "The success that our in-house research team has had in discovering new HCV product candidates can now be translated into potentially significant commercial value."
About R7128
R7128 is being developed for the treatment of chronic HCV infection. R7128 is a prodrug of PSI-6130, a cytidine nucleoside analog inhibitor of HCV RNA polymerase. A prodrug is a chemically modified form of a molecule designed to enhance the absorption, distribution and metabolic properties of that molecule. Results from an oral single ascending dose study of PSI-6130 in 24 healthy male volunteers showed that PSI-6130 was generally well tolerated with no serious adverse events in doses up to 3000 mg.
R7128 demonstrated potent, dose-dependent antiviral activity across four prior treatment-failure patient cohorts (n=40) receiving 750 mg or 1500 mg administered either once-daily or twice-daily for 14 days as monotherapy. The greatest mean decrease in HCV RNA from baseline was demonstrated in the patient cohort that received 1500 mg twice-daily, the highest dose of R7128 administered in the study. These patients demonstrated a mean 2.7 log10 IU/mL (>99%) decrease in HCV RNA. There was no evidence of the development of viral resistance in any dose cohort after 14 days of dosing.
In a 4-week Phase 1 combination study that was conducted in 50 treatment-naive patients chronically infected with HCV genotype 1, R7128 demonstrated potent short-term antiviral activity and was generally safe and well tolerated. Eighty-five percent (85%) of patients receiving R7128 1500mg twice-daily (BID) with Pegasys plus Copegus for 4 weeks achieved undetectable HCV RNA levels with safety and tolerability comparable to placebo with Pegasys plus Copegus.
We have commenced dosing two additional cohorts of this 4-week Phase 1 study. Cohort 3 will continue dose-exploration with administration of R7128 1000mg twice-daily (BID) with Pegasys plus Copegus in treatment-naive patients with HCV genotype 1. Cohort 4 will evaluate R7128 1500mg BID with Pegasys plus Copegus in treatment-experienced patients with genotypes 2 or 3 who did not achieve a sustained virologic response (SVR) with previous interferon-based therapy.
About Hepatitis C
Hepatitis C is a blood-borne infectious disease of the liver and is a leading cause of chronic liver disease and liver transplants. The WHO estimates that nearly 180 million people worldwide, or approximately 3% of the world's population, are infected with hepatitis C virus (HCV). The CDC has reported that almost four million people in the United States have been infected with HCV, of whom 2.7 million are chronically infected.
surf's up......crikey
