Nastech Completes Enrollment of Phase 2 Clinical Trial of PYY3-36 Nasal Spray to Treat Obesity

The study is designed to evaluate three different doses of PYY3-36 Nasal Spray compared to placebo and sibutramine (Meridia(R)), a commercially available oral weight loss drug, with the primary endpoint being weight loss



BOTHELL, WA, USA | January 8, 2008 |
Nastech Pharmaceutical Company Inc. (Nasdaq: NSTK) announced the completion of enrollment for its Phase 2 clinical trial of PYY3-36 Nasal Spray to treat obesity. The Company enrolled 551 obese patients at multiple clinical sites in the United States for a six-month, randomized, placebo-controlled dose ranging study. The study is designed to evaluate three different doses of PYY3-36 Nasal Spray compared to placebo and sibutramine (Meridia(R)), a commercially available oral weight loss drug, with the primary endpoint being weight loss.

"We are pleased with the rapid enrollment of 551 patients into the Phase 2 study to evaluate PYY3-36 nasal spray as a novel treatment for obesity. The fact that we exceeded our enrollment target of 510 patients is an indication of the unmet need for an effective obesity therapeutic," stated Gordon Brandt, M.D., President of Nastech. "The dramatic rise in obesity globally requires safe and effective treatment options for the hundreds of millions of people whose lives are impacted by this condition. If successful, PYY Nasal Spray would offer a patient-friendly product to promote weight loss."

About PYY

Peptide YY is a naturally occurring hormone that is believed to function as a physiologic inhibitor of food intake. PYY is released into the blood stream from specialized endocrine cells (L-cells) in the gut after a meal and is believed to trigger the feeling of satiety, or fullness. Because PYY is a peptide, initial studies focused on PYY delivery by injection. Utilizing its proprietary drug delivery technology, Nastech developed the nasal spray formulation of PYY as a unique, non-invasive treatment option for obesity.

About Nastech

Nastech is a biopharmaceutical company developing innovative products based on proprietary molecular biology-based drug delivery technologies. Nastech is creating technologies that enable the delivery of peptide and protein therapeutics without the requirement of an injection, which is currently the most common form of administration for this class of drugs. Nastech has also established a wholly-owned subsidiary, MDRNA, Inc., to focus on developing RNA-based technologies and therapeutics. MDRNA is harnessing the power of RNA interference, a cellular mechanism that can turn off the production of a specific protein through use of small interfering RNAs (siRNAs), to develop a new class of therapeutics by identifying key protein targets, designing the siRNAs that will turn off the production of the targeted proteins, and creating a formulation for the delivery of the therapeutics. Nastech and its collaboration partners are developing products for multiple therapeutic areas including osteoporosis, obesity, diabetes, autism, respiratory diseases and inflammatory conditions. For additional information about Nastech please visit http://www.nastech.com.

Nastech Forward Looking Statements

Statements made in this press release may be forward-looking statements within the meaning of Federal Securities laws that are subject to certain risks and uncertainties and involve factors that may cause actual results to differ materially from those projected or suggested. Factors that could cause actual results to differ materially from those in forward-looking statements include, but are not limited to: (i) the ability of Nastech or a subsidiary to obtain additional funding; (ii) the ability of Nastech or a subsidiary to attract and/or maintain manufacturing, research, development and commercialization partners; (iii) the ability of Nastech, a subsidiary and/or a partner to successfully complete product research and development, including preclinical and clinical studies and commercialization; (iv) the ability of Nastech, a subsidiary and/or a partner to obtain required governmental approvals; and (v) the ability of Nastech, a subsidiary and/or a partner to develop and commercialize products that can compete favorably with those of competitors. Additional factors that could cause actual results to differ materially from those projected or suggested in any forward-looking statements are contained in Nastech's most recent periodic reports on Form 10-K and Form 10-Q that are filed with the Securities and Exchange Commission. Nastech assumes no obligation to update and supplement forward-looking statements because of subsequent events.

SOURCE: Nastech Pharmaceutical Company Inc.

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