Hold your horses, I think an analyst used this to describe VX-222 at one time...
Associated Press
Pharmasset climbs as analyst raises target
Associated Press, 07.05.11, 12:23 PM EDT
NEW YORK -- Shares of hepatitis C drug developer Pharmasset Inc. rose Tuesday after a Canaccord Genuity analyst raised his price target on the stock.
THE SPARK: Analyst George Farmer assumed coverage of the stock, maintaining a "Buy" rating and raising the price target to $160 per share from $57. He said Pharmasset ( VRUS - news- people )'s hepatitis drug candidate PSI-7977 has "blockbuster potential" and its pipeline is promising, as another hepatitis C treatment has also looked very effective in earlier studies.
THE BIG PICTURE: The Princeton, N.J., company said last month that it will expand a trial of PSI-79777 to see if it is effective for patients who have not responded to other hepatitis C drugs and to see if it can eliminate the virus in eight weeks instead of the normal 12 weeks. The changes indicate the drug is working well in the study. PSI-7977 is years away from reaching the market, as Pharmasset plans to report mid-stage trial results later in 2011 and will have to conduct late-stage trials after that.
SHARE ACTION: Pharmasset stock rose $3.59, or 3.2 percent, to $116.33 in midday trading. Shares have traded between $23.56 and $135.92 over the past year.
Showing posts with label DAA therapy. Show all posts
Showing posts with label DAA therapy. Show all posts
Tuesday, July 5, 2011
Tuesday, June 28, 2011
P7 inhibitors face low barrier to resistance in HCV combination therapy...
New study published in Hepatology looking at the potential of p7 inhibitors in combo with P/R. It appears that a low barrier resistance may limit the utility of these drugs, but further research is underway to determine the fate of these particular agent. I know a physician that uses amantidine with P/R on a regular basis and truly believes that this drug enhances SVR.
P7 protein resistance mutations identified; represent drug targets for hepatitis C virus
Combination therapies inhibiting p7 could prevent spread of HCV in the body
British researchers have identified specific resistance mutations for two classes of p7 inhibitor, which may explain their lack of effectiveness in clinical trials combined with current standard of care. Study results support the role of p7 inhibitor combinations as potential components of future HCV-specific therapies and are available in the July issue of Hepatology, a journal published by Wiley-Blackwell on behalf of the American Association for the Study of Liver Diseases.
More than 3% of the world population is infected with HCV, which causes severe liver disease. HCV is the leading cause of liver-related mortality and most common cause for liver transplantation in the U.S. Studies have shown that the current treatment of PEGylated interferon alpha (IFN) and ribavirin (Rib) does not adequately achieve a sustained virological response in many HCV patients. This, coupled with the high cost and poor patient compliance, continues to drive demand for new virus-specific therapies.
"The HCV p7 ion channel plays a critical role in infectious virus production, representing an important new therapeutic target," said lead researcher Dr. Stephen Griffin with the Institute of Molecular Medicine at the University of Leeds in the UK. Previously, Dr. Griffin and colleagues determined that p7 acts as a proton channel within HCV infected cells, and that its function could be blocked by small molecule inhibitors, resulting in a blockade of infectious virus production.
In the present study, the team set out to expand on their prior work by predicting inhibitor binding sites using molecular modeling, which were then validated by the identification of resistance mutations. This allowed the researchers to define the mode of action for two prototype p7 inhibitor classes—adamantanes (amantadine and rimantadine) and alkylated imino-sugars (IS). This confirmed not only specific, but distinct effects for these inhibitors on the p7 protein. As these drugs are known to be safe in humans, they could rapidly be combined with new direct-acting HCV drugs, while paving the way for the development of novel, more potent compounds.
Dr. Griffin explains, "Our study confirms that single amino acid changes can mediate resistance to p7 inhibitor drugs." The study describes that low fitness cost for the observed mutations suggest that a minimal genetic barrier to their selection exists, which explains the perceived lack of p7 inhibitor efficacy in clinical trials combined with IFN/Rib. "Further investigation into the molecular basis of p7 drug resistance will aid in the design of novel, more effective therapies to combat HCV," concluded Dr. Griffin.
###
This study was conducted in collaboration with the laboratories of Professor Mark Harris, Professor Colin Fishwick and Dr. Richard Foster (University of Leeds), as well as Professor Steven Weinman (University of Kansas). Funding was through the UK Medical Research Council, Yorkshire Cancer Research and the University of Leeds Biomedical Health Research Centre.
Additional Media Contact:
Paula Gould
University of Leeds Communications & Press Office
+44 (0)113 343 8059
p.a.gould@leeds.ac.uk
This study is published in Hepatology. Media wishing to receive a PDF of the article may contact healthnews@wiley.com.
Full Citation:
Article: "Resistance Mutations Define Specific Antiviral Effects for Inhibitors of the Hepatitis C Virus (HCV) P7 Ion Channel." Toshana L. Foster, Mark Verow, Ann L. Wozniak, Matthew J. Bentham, Joseph Thompson, Elizabeth Atkins, Steven A. Weinman, Colin Fishwick, Richard Foster, Mark Harris and Stephen Griffin. Hepatology; Published Online: June 24, 2011 (DOI: 10.1002/hep.24371); Print Issue Date: July 2011. http://onlinelibrary.wiley.com/doi/10.1002/hep.24371/abstract.
About the Journal
Hepatology is the premier publication in the field of liver disease, publishing original, peer-reviewed articles concerning all aspects of liver structure, function and disease. Each month, the distinguished Editorial Board monitors and selects only the best articles on subjects such as immunology, chronic hepatitis, viral hepatitis, cirrhosis, genetic and metabolic liver diseases and their complications, liver cancer, and drug metabolism. Hepatology is published on behalf of the American Association for the Study of Liver Diseases (AASLD). For more information, please visit http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1527-3350 .
About Wiley-Blackwell
Wiley-Blackwell is the international scientific, technical, medical, and scholarly publishing business of John Wiley & Sons, with strengths in every major academic and professional field and partnerships with many of the world's leading societies. Wiley-Blackwell publishes nearly 1,500 peer-reviewed journals and 1,500+ new books annually in print and online, as well as databases, major reference works and laboratory protocols. For more information, please visit www.wileyblackwell.com or our new online platform, Wiley Online Library (wileyonlinelibrary.com), one of the world's most extensive multidisciplinary collections of online resources, covering life, health, social and physical sciences, and humanities.
P7 protein resistance mutations identified; represent drug targets for hepatitis C virus
Combination therapies inhibiting p7 could prevent spread of HCV in the body
British researchers have identified specific resistance mutations for two classes of p7 inhibitor, which may explain their lack of effectiveness in clinical trials combined with current standard of care. Study results support the role of p7 inhibitor combinations as potential components of future HCV-specific therapies and are available in the July issue of Hepatology, a journal published by Wiley-Blackwell on behalf of the American Association for the Study of Liver Diseases.
More than 3% of the world population is infected with HCV, which causes severe liver disease. HCV is the leading cause of liver-related mortality and most common cause for liver transplantation in the U.S. Studies have shown that the current treatment of PEGylated interferon alpha (IFN) and ribavirin (Rib) does not adequately achieve a sustained virological response in many HCV patients. This, coupled with the high cost and poor patient compliance, continues to drive demand for new virus-specific therapies.
"The HCV p7 ion channel plays a critical role in infectious virus production, representing an important new therapeutic target," said lead researcher Dr. Stephen Griffin with the Institute of Molecular Medicine at the University of Leeds in the UK. Previously, Dr. Griffin and colleagues determined that p7 acts as a proton channel within HCV infected cells, and that its function could be blocked by small molecule inhibitors, resulting in a blockade of infectious virus production.
In the present study, the team set out to expand on their prior work by predicting inhibitor binding sites using molecular modeling, which were then validated by the identification of resistance mutations. This allowed the researchers to define the mode of action for two prototype p7 inhibitor classes—adamantanes (amantadine and rimantadine) and alkylated imino-sugars (IS). This confirmed not only specific, but distinct effects for these inhibitors on the p7 protein. As these drugs are known to be safe in humans, they could rapidly be combined with new direct-acting HCV drugs, while paving the way for the development of novel, more potent compounds.
Dr. Griffin explains, "Our study confirms that single amino acid changes can mediate resistance to p7 inhibitor drugs." The study describes that low fitness cost for the observed mutations suggest that a minimal genetic barrier to their selection exists, which explains the perceived lack of p7 inhibitor efficacy in clinical trials combined with IFN/Rib. "Further investigation into the molecular basis of p7 drug resistance will aid in the design of novel, more effective therapies to combat HCV," concluded Dr. Griffin.
###
This study was conducted in collaboration with the laboratories of Professor Mark Harris, Professor Colin Fishwick and Dr. Richard Foster (University of Leeds), as well as Professor Steven Weinman (University of Kansas). Funding was through the UK Medical Research Council, Yorkshire Cancer Research and the University of Leeds Biomedical Health Research Centre.
Additional Media Contact:
Paula Gould
University of Leeds Communications & Press Office
+44 (0)113 343 8059
p.a.gould@leeds.ac.uk
This study is published in Hepatology. Media wishing to receive a PDF of the article may contact healthnews@wiley.com.
Full Citation:
Article: "Resistance Mutations Define Specific Antiviral Effects for Inhibitors of the Hepatitis C Virus (HCV) P7 Ion Channel." Toshana L. Foster, Mark Verow, Ann L. Wozniak, Matthew J. Bentham, Joseph Thompson, Elizabeth Atkins, Steven A. Weinman, Colin Fishwick, Richard Foster, Mark Harris and Stephen Griffin. Hepatology; Published Online: June 24, 2011 (DOI: 10.1002/hep.24371); Print Issue Date: July 2011. http://onlinelibrary.wiley.com/doi/10.1002/hep.24371/abstract.
About the Journal
Hepatology is the premier publication in the field of liver disease, publishing original, peer-reviewed articles concerning all aspects of liver structure, function and disease. Each month, the distinguished Editorial Board monitors and selects only the best articles on subjects such as immunology, chronic hepatitis, viral hepatitis, cirrhosis, genetic and metabolic liver diseases and their complications, liver cancer, and drug metabolism. Hepatology is published on behalf of the American Association for the Study of Liver Diseases (AASLD). For more information, please visit http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1527-3350 .
About Wiley-Blackwell
Wiley-Blackwell is the international scientific, technical, medical, and scholarly publishing business of John Wiley & Sons, with strengths in every major academic and professional field and partnerships with many of the world's leading societies. Wiley-Blackwell publishes nearly 1,500 peer-reviewed journals and 1,500+ new books annually in print and online, as well as databases, major reference works and laboratory protocols. For more information, please visit www.wileyblackwell.com or our new online platform, Wiley Online Library (wileyonlinelibrary.com), one of the world's most extensive multidisciplinary collections of online resources, covering life, health, social and physical sciences, and humanities.
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