Nabi Biopharmaceuticals Completes Enrollment of First NicVAX Phase III Clinical Trial

Final Data Expected in Fourth Quarter 2011 on First-in-Class Vaccine to Treat Nicotine Addiction and Prevent Smoking Relapse

ROCKVILLE, MD, USA | July 14, 2010 | Nabi Biopharmaceuticals (Nasdaq:NABI - News) announced today that it has completed enrollment in the first Phase III clinical trial of NicVAX(R) (Nicotine Conjugate Vaccine), the company's innovative and proprietary investigational vaccine being developed to treat nicotine addiction and prevent smoking relapse. The company initiated this clinical trial on November 3, 2009 and expects to have final data in the fourth quarter of 2011, now that enrollment is complete. A second Phase III trial began in March 2010 and enrollment is well under way with final data expected in early 2012.

Both Phase III studies for NicVAX are double-blinded, placebo-controlled studies enrolling approximately 1,000 patients each. The primary endpoint of each study is long-term abstinence from smoking at 12 months. Abstinence will be evaluated by several measures, including self-reported cigarette consumption and exhaled carbon monoxide. Secondary endpoints include the abstinence rate at various time intervals, safety and immunogenicity, and the effect of NicVAX on withdrawal symptoms, cigarette consumption, smoking satisfaction and nicotine dependency. The U.S Food and Drug Administration agreed with Nabi on the study design, protocol and end points through a Special Protocol Assessment (SPA). The SPA forms a basic foundation to support approval of a New Drug Application. The Company also received scientific advice from the European Medicines Agency that confirms and supports the trial protocol.

Nabi closed an exclusive world-wide option and license agreement for the development and commercialization of NicVAX with GlaxoSmithKline Biologicals SA in March 2010, for a total potential consideration of over $500 million, including a nonrefundable $40 million upfront payment. In addition Nabi may also receive royalties on global sales of NicVAX and next-generation nicotine vaccines.

"We are very pleased that enrollment in this trial has been completed on schedule and enrollment in the second Phase III trial is progressing according to plan," said Dr. Raafat Fahim, President and Chief Executive Officer of Nabi Biopharmaceuticals. "NicVAX has the potential to shift the smoking-cessation therapeutic paradigm from quitting to long-term abstinence. We have optimized the dose regimen, aligned the target quit date with peak antibody levels and have defined the study design, trial protocol and end points through the SPA. We believe that we have undertaken all the necessary steps to maximize the likelihood of success in Phase III. NicVAX is on track to be the first-in-class nicotine vaccine for smoking cessation. No other competitors have reached this stage of development."

How NicVAX Works

Nicotine is a small molecule that, upon inhalation into the lungs, quickly passes into the bloodstream and subsequently reaches the brain by crossing the blood-brain barrier. Once in the brain, the nicotine binds to specific nicotine receptors, resulting in the release of stimulants, such as dopamine, a chemical linked to pleasure and to addiction. NicVAX stimulates the immune system to produce antibodies that bind to nicotine, creating an antigen/antibody complex that is too large to cross the blood-brain barrier. In this way, NicVAX blocks nicotine from reaching these receptors in the brain, fewer stimulants are released, and the pleasurable, highly-addictive effects of nicotine are diminished, thereby making it easier to quit smoking. Pre-clinical and previous clinical data show that NicVAX's ability to block nicotine from reaching the brain could help people quit smoking. Because the nicotine antibodies circulate for long periods of time, Nabi believes NicVAX may also be effective in preventing smoking relapse and support long-term abstinence. This is a very important difference between NicVAX and existing anti-smoking treatment therapies. Relapse is a significant challenge facing smokers; with currently-available smoking cessation therapies, relapse rates can be as high as 90% in the first year after a smoker quits.

About Nabi Biopharmaceuticals

Nabi Biopharmaceuticals leverages its experience and knowledge in powering the immune system to develop products that target serious medical conditions in the areas of nicotine addiction and gram-positive bacterial infections. Nabi Biopharmaceuticals is currently developing NicVAX(R) (Nicotine Conjugate Vaccine), an innovative and proprietary investigational vaccine for treatment of nicotine addiction and prevention of smoking relapse. The company is headquartered in Rockville, Maryland. For additional information about Nabi Biopharmaceuticals, please visit

SOURCE: Nabi Biopharmaceuticals

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