Findings Include 80% SVR Rate with Nitazoxanide-Based Combination Therapy and New Insights into Mechanism of Action of Nitazoxanide
SAN FRANCISCO, Nov. 3 /PRNewswire/ -- Romark Laboratories, a privately held biopharmaceutical company, today announced that data from studies of nitazoxanide in chronic hepatitis C virus (HCV) infection are being communicated in three presentations made at the 59th Annual Meeting of the American Association for the Study of Liver Diseases (AASLD), also known as The Liver Meeting(R), and the 50th Anniversary Meeting of the International Association for the Study of the Liver (IASL) in San Francisco, October 31 - November 4, 2008.
"These new studies confirm earlier data suggesting synergistic activity between nitazoxanide and peginterferon in genotype 4 patients and provide a first look at sustained virologic response in a limited number of genotype 1 patients," said Jean-Francois Rossignol, M.D., Chief Science Officer of Romark Laboratories and discoverer of nitazoxanide. "These data also provide interesting insights into the mechanism of action of nitazoxanide, including a potential role for its combination with STAT-C drugs, and confirm previous findings related to its safety."
The three presentations include:
-- "Evaluation of a 4 Week Lead-In Phase with Nitazoxanide (NTZ) Prior
to Peginterferon (PEGIFN) Plus NTZ for Treatment of Chronic Hepatitis C:
Final Report," J.F. Rossignol et al., Sunday, November 2, 4:15 PM
PST (Oral Session IASL #87), and Tuesday, November 4, 8:00 AM - 12:30
PM PST (AASLD Presidential Poster #1848)
In this Phase II study, 44 patients (40 with HCV genotype 4; 3 with HCV genotype 1; and 1 with HCV genotype 2) received 4 weeks of nitazoxanide 500 mg twice daily followed by Pegasys(R) (peginterferon alfa-2a) and nitazoxanide for 36 weeks. Data from Romark's STEALTH C-1 trial was used as an historical control. Analysis of data was by intention-to-treat.
Thirty-five of 44 patients (80%) treated with a 4-week lead-in phase of nitazoxanide followed by the addition of peginterferon for 36 weeks experienced a SVR 24 weeks after the end of treatment compared to 50% in the standard of care (SOC, peginterferon alfa-2a plus ribavirin for 48 weeks) historical control group (P = 0.006), 61% in patients receiving a 12-week lead-in with nitazoxanide followed by 36 weeks of nitazoxanide plus peginterferon alfa-2a, and 79% in patients receiving a 12-week lead-in with nitazoxanide followed by 36 weeks of nitazoxanide plus SOC.
Of the 44 patients in the study, 78% (n=40) of patients with HCV genotype 4, 100% (n=3) of patients with HCV genotype 1, and 100% (n=1) of HCV genotype 2, had an SVR with undetectable virus at 24 weeks following end of treatment.
Adverse events reported for these 44 patients were similar to those reported in the STEALTH C-1 trial. Patients treated with nitazoxanide experienced no more side effects than patients who received the SOC therapy. Only one of the 44 patients discontinued therapy due to noncompliance. There were no serious adverse events or discontinuations due to adverse events.
"These data confirm findings of our STEALTH C-1 trial related to safety
and efficacy of nitazoxanide in patients infected with HCV genotype 4, show
that the nitazoxanide lead-in phase prior to standard of care treatment can
be reduced from 12 to 4 weeks, and indicate that ribavirin may not be
needed to maintain SVR," said Emmet B. Keeffe, M.D., Chief Medical Officer
of Romark Laboratories.
-- "Potential Role for Nitazoxanide in Combination with STAT-C Agents
for the Inhibition of HCV Replication Without the Development of
Resistance," Korba, et al. Sunday Nov. 2, 5:30 PM PST (Oral Session
This oral presentation by Brent Korba, Ph.D. of Georgetown University
Medical Center, described preclinical studies demonstrating synergistic
interactions between nitazoxanide and direct-acting antiviral drugs
targeting NS5B (2'C methylcytidine and HCV-796) and NS3 (telaprevir and
BILN-2061) in HCV replicons. Nitazoxanide was also active against
telaprevir- and 2'C methylcytidine-resistant mutant replicons. The authors
concluded that nitazoxanide is a good candidate for combination therapies
with STAT-C agents in the absence of interferon or ribavirin.
-- "Nitazoxanide (NTZ) is an Inducer of eIF2a and PKR
phosphorylation," Elazar et al., Tuesday, November 4, 8:00 AM -
12:30 PM PST (Poster #1881)
This poster presentation by Menashe Elazar, Ph.D. of the Division of Gastroenterology and Hepatology, Department of Medicine, Stanford University School of Medicine, showed that nitazoxanide increases the intracellular levels of phosphorylated eukaryotic translation initiation factor 2alpha (eIF2alpha), a key mediator of host cell antiviral defenses. Co-treatment with interferon increased nitazoxanide-induced eIF2alpha phosphorylation. . Nitazoxanide was also shown to increase the phosphorylation of protein kinase R (PKR), a key step in the activation of PKR's kinase activity towards eIF2alpha.
"Data presented in each of these communications has provided important information in guiding the ongoing clinical development of nitazoxanide," said Dr. Rossignol.
About Hepatitis C
Hepatitis C is a blood-borne infectious disease that is caused by the hepatitis C virus (HCV). It is the most common cause of chronic hepatitis in the U.S. and may eventually lead to cirrhosis, liver cancer and liver failure. The disease is transmitted by contact with HCV-infected blood. A large majority of those infected do not show symptoms, but fatigue, abdominal pain and nausea can be common. The current standard treatment of care, peginterferon and ribavirin, is effective in about half of all patients treated. According to the Centers for Disease Control, HCV affects an estimated 4.1 million Americans.
About Romark Laboratories
Romark Laboratories (http://www.romark.com), a privately held biopharmaceutical company, has discovered and developed a new class of small molecule antivirals known as thiazolides. The Company is developing nitazoxanide, the first of the thiazolide class, for the treatment of chronic hepatitis C, and is developing other new thiazolides for treating viral diseases including chronic hepatitis B. Alinia(R) (nitazoxanide) is approved by the U.S. Food and Drug Administration and marketed by Romark for the treatment of Cryptosporidium and Giardia infection.
|SOURCE Romark Laboratories|
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