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TorreyPines Therapeutics Completes Phase I Multiple Dose Clinical Trial of NGX267, a Selective M1 Agonist for the Potential Treatment of Cognitive Impairment Associated with Schizophrenia

LA JOLLA, Calif., Sept. 10 /PRNewswire-FirstCall/ -- TorreyPines Therapeutics, Inc. (Nasdaq: TPTX) today announced completion of its third Phase I clinical trial for NGX267, in clinical development for the treatment of cognitive impairment associated with schizophrenia (CIAS). The compound, a functionally selective muscarinic (M1) agonist, was found to be safe and well-tolerated when given orally to healthy male volunteers once-daily for four consecutive days. In two previous Phase I trials, NGX267, administered as single oral doses, was shown to be well-tolerated in healthy young adult males, as well as in healthy elderly males and females.

The purpose of the Phase I trial was to investigate the safety, tolerability and pharmacokinetics of multiple doses of NGX267 and to confirm data from previous studies in which NGX267 demonstrated evidence of muscarinic receptor stimulation as measured by increases in salivary flow. A total of 60 healthy males, between the ages of 18 and 55, were enrolled in the double-blind, placebo-controlled trial conducted at one center in Belgium. In a series of sequential dosing cohorts, subjects received a single oral dose of either 10, 20, 30 or 35 mg of NGX267 once-daily for four consecutive days. NGX267 was well tolerated at doses up to and including 30 mg, a dose range believed to be effective for treating memory and cognitive disturbances. TorreyPines plans to initiate a Phase II dose-ranging trial in CIAS during the first half of 2008.

A secondary objective was to obtain quantitative measures of salivary flow, prior to and at multiple time points post-dosing, as a peripheral biomarker for stimulation of the muscarinic receptor. In the study, increases in peak and total salivary flow were detected for NGX267 in comparison to placebo. These effects increased linearly with dose, were maintained over four days of dosing, and within subject peak increases in salivary flow correlated with peak plasma levels of NGX267.

Decreased salivary flow results in dry mouth, or xerostomia, and is a symptom of a number of underlying conditions. Causes of dry mouth include the autoimmune disorder Sjogren's Syndrome, radiation treatment to the head and neck, and HIV-related salivary gland disease. Xerostomia can also be a side effect of some medications and may be associated with aging.

"The data from this study are promising, given the low incidence of adverse events at potentially therapeutic doses for treating CIAS," said Neil Kurtz, M.D., President and Chief Executive Officer of TorreyPines. "In addition, the data not only confirm earlier findings that NGX267 increases salivary flow, but also demonstrates that the effect is seen at multiple dose levels and maintained after repetitive dosing. Moving forward, we now have data that suggests that this well-tolerated product candidate could be effective in treating not only CIAS, but also xerostomia. In addition to our planned Phase II study in CIAS, we will consider initiating a small proof of concept study for xerostomia early next year."

About TorreyPines Therapeutics

TorreyPines Therapeutics, Inc. is a clinical stage biopharmaceutical company committed to the discovery, development and commercialization of novel small molecules to treat diseases and disorders of the central nervous system (CNS). Led by an accomplished management team, TorreyPines is leveraging novel drug targets and technologies to potentially deliver new CNS therapies for chronic pain, including migraine and neuropathic pain; and cognitive disorders, including cognitive impairment associated with schizophrenia and Alzheimer's disease. Further information is available at

This press release contains forward-looking statements or predictions. Such forward-looking statements include, but are not limited to, statements regarding the potential for NGX267 to treat symptoms of CIAS, the potential for NGX267 to treat xerostomia, that the well tolerated dose range may be effective for treating memory and cognitive disorders, and the planned timing of the initiating of clinical trials in CIAS and xerostomia. Such statements are subject to numerous known and unknown risks, uncertainties and other factors, which may cause TorreyPines' actual results to be materially different from historical results or from any results expressed or implied by such forward-looking statements. In particular there is no guarantee that NGX267 will successfully treat symptoms of CIAS or xerostomia, the dose range may not be effective for treating memory and cognitive disorders, that the clinical trials for CIAS and xerostomia will be conducted in the anticipated timeframe or that TorreyPines will be able to complete the necessary development work and receive regulatory approval for NGX267. These and other risks which may impact management's expectations are described in greater detail in the TorreyPines Therapeutics' annual report on Form 10-K for the year ended December 31, 2006 as well as TorreyPines Therapeutics' subsequent filings with the Securities and Exchange Commission. TorreyPines Therapeutics undertakes no obligation to publicly release the result of any revisions to such forward-looking statements that may be made to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

SOURCE TorreyPines Therapeutics, Inc.
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