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For the past decade or more multiple drug resistant strains of bacteria such as methicillin resistant Staphylococcus aureus (MRSA), enterococci and other Gram positive cocci have been highlighted and showcased in the medical and lay press. While the incidence of infections caused by MRSA and other Gram positive cocci has steadily risen, antibacterial drug discovery experts have long known that the greatest disease threat in the future will be from emerging multiple antibiotic resistant strains of Gram negative bacteria including Acinetobacter baumannii, Klebsiella pneumoniae, Serratia marcescens and Pseudomonas aeruginosa.

Last Spring, in an interview that I conducted with Barry Eisenstein, MD, Senior Vice President of Scientific Affairs at Cubist Pharmaceuticals and an antibacterial drug discovery expert, he indicated that there are currently no drugs in development to treat infections caused by antibiotic resistant Gram negative bacteria. He warned that this, coupled with the loss of interest in antibiotic development by large pharmaceutical companies, will cause infections caused by multiple drug resistant Gram negative bacteria to become a serious unmet medical need in the not so distant future. The appearance of an article in the New York Times this past Saturday chronicling the rise of infections caused by antibiotic resistant Gram negative bacterial suggests that the not so distant future may have already arrived! For the record: would newspaper and television reporters please refrain from identifying bacteria as “germs.” It is an anachronistic term which was coined in the 19^th century before bacteria and viruses were conclusively identified as the cause of most infectious diseases.

Despite the media hype about antibiotic resistant Gram positive bacteria, a variety of new drugs have been developed to treat infections caused by these bacteria. Interestingly, because of greater public awareness about MRSA infections and improved hospital infection control and surveillance programs, the incidence of disease caused by MRSA and other Gram positive bacteria is finally beginning to wane. Unfortunately, the same is not true for infections caused by antibiotic resistance Gram negative bacteria.

For those of you who may not know, the cell wall architecture of Gram negative bacteria (and a multitude of antibiotic resistance mechanisms) makes it much more difficult and costly to develop new antibiotics to treat Gram negative infections. Consequently, research in this area has been largely ignored for the past 15 years or so. This means that in the future the morbidity and mortality associated with infections caused by antibiotic resistant Gram negative bacteria is certain to rise. With this in mind, persons at the greatest risk of developing these infections include patients in hospitals and long term care facilities and individuals receiving implantable medical devices.

Because most large pharmaceutical companies abandoned antibiotic drug discovery in the mid to late 1990s, it is unlikely that new Gram negative antibiotics will come from the pharmaceutical sector. While there are several small biopharmaceutical start ups working on antibiotics for Gram negative bacteria (KaloBios Pharmaceuticals, Calixa Therapeutics and Novexel) the increasing regulatory scrutiny and rising development costs suggests that these companies may have trouble bringing new antibiotics to market. Sadly, this places the onus of new Gram negative antibiotic discovery squarely on the shoulders of the US government. To that end, as much as it pains me to say this, it will likely take the death of government official or family member before sufficient resources are allocated to address this rapidly growing unmet medical need. Maybe the Obama Administration ought to think about allocating stimulus monies to begin to address the problem!

Until next time...

Good Luck and Good Job Hunting!!!!!!!

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Rumors are rife that Novartis is going to purchase Lexington, MA-based Cubist for $1.6 billion. Wall Street analysts are speculating that Novartis may announce the deal as early as Monday.

Cubist manufactures Cubicin (daptomycin), one of only a handful of new antibiotics brought to market in the past 20 years that is effective against many infections caused by Gram-positive bacteria, most notably methicillin-resistant Staphylococcus aureus (MRSA). The company is developing new lipopeptide antibiotics similar to Cubicin and also has an active anti-viral drug discovery program.

Over the past 10 years, big pharma companies largely abandoned antibiotic research and placed all discovery efforts in the hands of only a few smaller public companies and startups. Cubist is the only independent biopharmaceutical company that successfully brought a new antibiotic to market. 

Novartis’ possible acquisition of Cubist signals, that at least one major pharmaceutical company sees opportunities and upside in the antibiotic drug discovery market. Several years ago, Pfizer acquired another antibiotic discovery company, Vicuron (formerly Versicor) but to date the acquisition has not yielded any new antibiotics. While Novartis’ acquisition of Cubist is yet another sign of consolidation that is taking place in the life sciences sector, it may bolster new efforts in the antibacterial drug discovery area. Unlike Cubist, Novartis has enough money and marketing muscle to increase Cubin sales and develop some of the exciting new molecular entities in Cubist’s drug development pipeline.

Until next time…..

Good Luck and Good Job Hunting!!!!

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Novartis announced today that it intends to purchase Malvern, PA-based Protez Pharmaceuticals for $400 million. Protez is developing a novel spectrum carbapenem antibiotic that is active against variety drug-resistant Gram positive (most notably MRSA )and Gram negative bacterial pathogens. Its lead compound, PZ-601, is in Phase II human clinical testing. Protez acquired PZ-601 (formerly SMP-216601) in 2005 from Dainippon Sumitomo Pharmaceuticals.   

Novartis is buying Protez to sure up its antibacterial drug pipeline. Novartis already sells Cubicin, (manufactured by Massachusetts-based Cubist Pharmaceuticals Inc.,) in Europe and is developing other antimicrobials including Aurograb and Tifacogin to treat infections.

Like many of the newly marketed antibiotics, PZ-601 is injected and not orally bioavailable. Nevertheless, it is likely that PZ-601 will provide much needed help against the ever increasing number of drug resistant bacterial isolates. Swiss companies Basilea Pharmaceutica AG and Arpida Ltd. are also working on experimental medicines to treat MRSA.

It is not clear how the acquisition will affect Protez employees.  I suspect that most of the employees will keep their jobs except for Company officers.

Until next time…

Good Luck and Good Job Hunting!!!!!

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The regulatory problems at Wyeth continue. The US Food and Drug Agency announced that it issued an approvable letter for Tygacil (Wyeth’s tetracycline-like antibiotic) to treat community acquired pneumonia (CAP). Apparently, FDA regulators want more data on the effectiveness and safety of Tygacil in severe cases of CAP and additional information on possible liver toxicity.

Tygacil, an intravenously administered antibiotic, won FDA approval in 2005 to treat adults with complicated intra-abdominal infections and complicated skin and skin-structure infections. Tygacil had about $138 million in sales last year; falling far short of the projected $500-$800 million in annual sales that it was expected to yield when it was first brought to market. If Wyeth gains approval for CAP, expect Tygacil sales to soar.

In other regulatory news, FDA granted Wyeth “fast-track approval” for a new version of its market-leading pediatric pneumococcal vaccine called Prevnar. The new 13-valent formulation will provide protection against 13 different pneumococcal serotypes. The older version only provided protection against 7 serotypes. Wyeth hopes to complete its filing for pediatric use of the new Prevnar vaccine in early 2009. Prevnar is Wyeth’s second-leading product with sales of about $2.5 billion in 2007.  

The new Prevnar vaccine will likely go head-to-head with GlaxoSmithKline’s new 10-valent pneumococcal vaccine  called Synflorix^Tm which is in late stage clinical development and is currently being reviewed for marketing approval in the EU. Unlike Wyeth’s vaccine, Synflorix^Tm  was found to be effective in protecting against otitis media (ear infections) caused by Haemophilus influenzae.

Until next time,

Good Luck and Good Job Hunting (avoid Collegeville, PA)!!!!!!!!

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