Navigation Links
Preclinical Study Finds Protease Inhibitor-Resistant HIV May Have,Reduced Potential to Develop Resistance to Panacos' Bevirimat

WATERTOWN, Mass.--(BUSINESS WIRE)--May 29, 2007 - Panacos Pharmaceuticals, Inc. (NASDAQ:PANC), a biotechnology company dedicated to developing the next generation of antiviral therapeutic products, today announced the results of a new study indicating that HIV resistant to Protease Inhibitors (PI) may have reduced potential for the development of resistance to the HIV maturation inhibitor bevirimat in laboratory assays. The study, carried out by scientists in Dr. Eric Freed's group at the HIV Drug Resistance Program at the National Cancer Institute, Frederick, MD, in collaboration with Panacos, was presented at the Cold Spring Harbor Laboratory's (CSHL) Retrovirus Conference held May 22-27, 2007 in Cold Spring Harbor, NY.

While resistance to bevirimat has not yet been reported in clinical studies, bevirimat-resistant HIV can be generated in the laboratory, as is the case with other HIV drugs. In previous studies where HIV was grown for several weeks in cell culture in the presence of bevirimat at suboptimal concentrations, mutations conferring resistance to bevirimat were found exclusively at or near bevirimat's target, the capsid-SP1 cleavage site in the HIV Gag protein. Cleavage of capsid from SP1, the final step in viral maturation, is mediated by the viral protease enzyme. Bevirimat inhibits this cleavage step by interacting with the capsid-SP1 junction in Gag, suggesting that pre-existing PI resistance mutations may have an impact on the development of bevirimat resistance.

In the new study, wild-type HIV, as well as HIV bearing major mutations conferring PI resistance, were grown in cell culture in the presence of bevirimat at suboptimal concentrations. Bevirimat resistance developed after several weeks in both wild-type and PI-resistant HIV, but took more than twice as long to develop in the PI-resistant virus. The bevirimat resistance mutation that appeared in PI-resistant virus was located at th e CA-SP1 junction and has been observed previously in bevirimat resistance generation studies. The CSHL conference presentation concluded that bevirimat resistance may be less likely to arise in PI-resistant HIV strains.

Dr. Graham P. Allaway, Panacos' President and Chief Operating Officer commented, "Clinical studies to date suggest resistance to bevirimat does not develop rapidly, in contrast to some currently marketed HIV drugs, possibly because there is selective pressure to maintain the integrity of the capsid-SP1 cleavage site sequence, which is highly conserved among HIV strains. While resistance tends to develop eventually to all HIV inhibitors, the new study suggests there may be a greater hurdle to bevirimat resistance development in patients with PI-resistant virus. These patients represent one of the major groups who could potentially benefit from novel-mechanism HIV drugs such as bevirimat."

About Panacos

Panacos is developing the next generation of anti-infective products through discovery and development of small molecule oral drugs for the treatment of HIV and other major human viral diseases. HIV infects approximately 1.7 million people in North America and Western Europe and approximately 40 million people worldwide. Approximately 650,000 patients are treated annually for HIV in the United States and Western Europe. Resistance to currently available drugs is one of the most pressing problems in HIV therapy and the leading cause of treatment failure. Panacos' proprietary discovery technologies are designed to combat resistance by focusing on novel targets in the virus life cycle, including virus maturation and virus fusion.

Panacos' lead candidate, bevirimat (PA-457), is the first in a new class of oral HIV therapeutics under development called maturation inhibitors, discovered by Panacos scientists and their academic collaborators. Based on its novel mechanism of action, bevirimat is designed to have potent activity agai nst a broad range of HIV strains, including those that are resistant to existing classes of drugs. The Company has completed seven clinical studies of bevirimat in over 300 subjects, showing significant reductions in viral load in HIV-infected subjects and a promising safety profile, and is currently in Phase 2b clinical trials. The Company also has a second-generation program in HIV maturation inhibition in clinical testing and a research program to develop oral HIV fusion inhibitors.

Except for the historical information contained herein, statements made herein, including those relating to the clinical development of bevirimat, the potential results of treatment with bevirimat and future clinical trials and clinical practice with bevirimat are forward-looking statements made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These statements involve risks as set forth in the Company's filings with the Securities and Exchange Commission, including, but not limited to, the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2006 and the Company's Quarterly Report for the period ended March 31, 2007. These risks and uncertainties could cause actual results to differ materially from any forward-looking statements made herein. The Company undertakes no obligation to publicly update forward-looking statements, whether because of new information, future events or otherwise, except as required by applicable law.


Panacos Pharmaceuticals, Inc.
Jill Smith
Director, Corporate Communications
Peyton Marshall
EVP and Chief Financial Officer


Related medicine technology :

1. Neose Announces Presentation of Positive Preclinical Data on GlycoPEGylated Factor VIIa at the XXI Congress of the International Society on Thrombosis and Haemostasis
2. Gene Therapy Eradicates Pancreatic Cancer in Preclinical Trial Targeting Systems Success in Mouse Model Reported in Cancer Cell
3. YM BioSciences Announces Preclinical Data Confirming Nimotuzumab Binds to the EGF Receptor and Potentiates Radiotherapy
4. ZIO-101 (Darinaparsin) Interim Phase II and Preclinical Data Presented at International Myeloma Workshop
5. ACE-011 Improves Multiple Myeloma Bone Disease in a Preclinical Model
6. Publication on Pixantrone Preclinical Studies Demonstrates Reduced Cardiotoxicity Compared to Equiactive Doses of Doxorubicin and Mitoxantrone
7. Genaera Presents Preclinical Data on Trodusquemine (MSI-1436) for the Treatment of Obesity at the American Diabetes Association 67th Scientific Session
8. Elixir Pharmaceuticals Presents Preclinical Data Highlighting Its Ghrelin Antagonist Program at the American Diabetes Associations Annual Meeting
9. Genaera to Present Preclinical Data on Trodusquemine for the Treatment of Obesity at the American Diabetes Association 67th Scientific Sessions
10. Metabasis Therapeutics Presents Results of Preclinical Studies for MB07811, Its Novel Product Candidate for the Treatment of Hyperlipidemia, at the Endocrine Societys Annual Meeting
11. Elixir Pharmaceuticals Presents Additional Preclinical Data Demonstrating the Potential of Ghrelin Antagonism to Regulate Metabolism, Body Weight and Glycemic Control
Post Your Comments:
(Date:11/25/2015)... , Nov. 25, 2015 AAIPharma ... planned investment of at least $15.8  Million to ... Wilmington, NC . The expansion will ... to meet the growing demands of the pharmaceutical ... site expansion will provide up to 40,000 ...
(Date:11/25/2015)... MELVILLE, N.Y. , Nov. 25, 2015  Henry ... products and services to office-based dental, medical and animal ... Dental (GNYDM) Meeting the Henry Schein ConnectDental® Pavilion ... industry,s broadest array of open solutions designed to help ... Click here for a schedule of ...
(Date:11/25/2015)... -- Trovagene, Inc. (NASDAQ: TROV ), a developer of ... Antonius Schuh, Ph.D., is scheduled to present a corporate ... Healthcare Conference. th Annual Piper Jaffray ... New York on Tuesday, December ... be available for one-on-one meetings during the conference. The ...
Breaking Medicine Technology:
(Date:11/27/2015)... ... November 27, 2015 , ... The rapid speed at which ... age, more care is needed, especially with Alzheimer’s, dementia and other cognitive conditions ... overworked. The forgotten part of this equation: 80 percent of medical care occurs ...
(Date:11/27/2015)... , ... November 27, 2015 , ... ... November 27th edition of USA Today in Atlanta, Dallas, New York, Minneapolis, South ... 750,000. The digital component is distributed nationally, through a vast social media strategy ...
(Date:11/27/2015)... ... 2015 , ... A simply groundbreaking television series, "Voices in America", which is ... an array of issues that are presently affecting Americans. Dedicated to providing the world ... is changing the subjects consumers focus on, one episode at a time. , ...
(Date:11/27/2015)... Rosa, CA (PRWEB) , ... November 27, 2015 , ... ... Northern California Medical Associates, Inc. and Dr. Tucker Bierbaum with Emergency Medicine at ... meeting. They observed that both STEMI and Sepsis conditions present in similar ways and ...
(Date:11/26/2015)... ... November 26, 2015 , ... CognisantMD and Cambridge ... imaging in the Waterloo region. Using the Ocean Platform, family physicians can now ... their electronic medical record (EMR) without the need for redundant patient entry or ...
Breaking Medicine News(10 mins):