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GSK Receives FDA Approval For Raxibacumab Anti-toxin For The Treatment Of Inhalational Anthrax

LONDON, Dec. 14, 2012 /PRNewswire/ -- GlaxoSmithKline plc [LSE/NYSE: GSK] announced today that the U.S. Food and Drug Administration (FDA) has approved raxibacumab for the treatment of adult and pediatric patients with inhalational anthrax due to Bacillus anthracis in combination with appropriate antibacterial drugs and for prophylaxis of inhalational anthrax when alternative therapies are not available or are not appropriate .

The effectiveness of raxibacumab is based solely on efficacy studies in animal models as it is not ethical or feasible to conduct controlled clinical trials with intentional exposure of humans to anthrax. The safety of raxibacumab has been studied in healthy adult volunteers, however, there have been no studies of raxibacumab in the pediatric population. Dosing in pediatric patients was derived using modelling based on data in adults. Raxibacumab does not have direct antibacterial activity. Raxibacumab does not cross into the brain and does not prevent or treat anthrax meningitis. Raxibacumab should be used in combination with appropriate antibacterial drugs.

"Raxibacumab is an important part of an ongoing collaboration between GSK and the US government to address a range of public health concerns," said Zhi Hong, Senior Vice President and Head of Infectious Diseases, GlaxoSmithKline. "It will be an important addition to the new approaches required to address our critical biodefense needs."

"Human Genome Science began work on raxibacumab in 2001 in response to the anthrax attacks in the United States. Our development program charted new territory in terms of the science and the regulatory pathway and was a result of our successful collaboration with the Biomedical Advanced Research and Development Authority (BARDA) and FDA," said Sally Bolmer, Senior Vice President of Development and Regulatory Affairs at HGS, where the drug was discovered and developed. HGS was recently acquired by GSK.

Raxibacumab is the first monoclonal anti-toxin to be approved for inhalational anthrax. Anthrax is a rare and lethal disease, caused by a toxin producing bacterium. While antibiotics target the anthrax bacteria, raxibacumab offers an additional mechanism by blocking the activity of the anthrax toxin, which plays a key role in the progression of the disease. Raxibacumab demonstrated an improved survival rate over  control in two relevant animal models both in combination with antibiotics and alone.

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