TPTX » Topics » Advances and milestones with our drug development programs

This excerpt taken from the TPTX 10-K filed Mar 16, 2006.

     Advances and milestones with our drug development programs

          We currently have three compounds in development for Alzheimer’s disease (AD): Phenserine, a potential symptomatic and disease progression treatment for mild to moderate AD; Posiphen™, a potential disease progression treatment for AD; and Bisnorcymserine (BNC), a potential symptomatic treatment for severe AD. See Item 1, Section B, Axonyx Business Strategy and Drug Development Programs.

          In February 2005, we announced the top line outcome of our first Phase III clinical trial with Phenserine in 375 patients exhibiting mild to moderate AD. The trial showed that although there were encouraging trends with both Phenserine 10mg and 15mg twice daily, overall these did not result in a statistically significant improvement over placebo for the protocol’s primary endpoints following 26 weeks of treatment. The trial did not reveal any adverse events, safety or tolerability concerns. At that time we halted additional patient recruitment for the second and third Phase III clinical trials in order to evaluate the planned Phenserine clinical program following recommendations from the Company’s Scientific Advisory Board and Safety Steering Committee.

          In July 2005, we conducted a second interim statistical analysis of 59 patients from a then ongoing Phase IIb double-blind placebo-controlled clinical trial (AX-CL-06a). This trial was designed to evaluate the effects of Phenserine tartrate treatment for 6 months on plasma and cerebrospinal fluid (CSF) levels of beta-amyloid (Ab 1- 42) and other biomarkers in mild to moderate AD patients. While this second interim analysis appeared to again confirm that Phenserine could have a beneficial effect on the levels of beta-amyloid, definitive conclusions could not be drawn due to the variability of the data.

          In August 2005, the U.S. Food and Drug Administration (FDA) approved our Investigational New Drug (IND) application, submitted in June 2005, allowing Phase I clinical testing of Posiphen™. The first Phase I clinical study primarily evaluated the safety of single ascending doses of Posiphen™ in healthy volunteers.

          In September 2005, we announced top line results of an analysis of the two curtailed Phase III clinical trials (AX-CL-09/010) with Phenserine. Results following 12 weeks of treatment, as measured by the AD Assessment Scale, cognitive subscale (ADAScog) and Clinical Interview Based Impression of Change with caregiver input (CIBIC+), did not demonstrate a statistically significant benefit of Phenserine treatment over placebo. Patient recruitment for these studies had previously been halted and the planned 26-week treatment period shortened based on previously released results of a 375-patient trial (AX-CL-06) [see above] which had showed no statistically significant differences between Phenserine and placebo. There were no safety or tolerability concerns associated with Phenserine treatment.


          In November 2005, we announced the results of an additional analysis of a subgroup of 188 patients from the two curtailed Phase III clinical trials (AX-CL-09/010) with Phenserine. The subgroup of patients, who received Phenserine 15mg twice daily, demonstrated a statistically significant benefit over placebo as measured by ADAS-cog, when treated for more than 12 weeks. Additionally, this subgroup showed a positive trend towards improvement in CIBIC+ test, which approached statistical significance. There were no unexpected safety or tolerability concerns associated with Phenserine treatment. This analysis was undertaken in addition to the previously announced results of the primary pre-defined statistical analysis.

          In January 2006, we announced that we had granted to Daewoong Pharmaceutical Company Ltd. (Daewoong) an exclusive license for the use of Phenserine in the South Korean market. Under the terms of the agreement Daewoong, at its own cost, undertakes to pursue the product development and regulatory work necessary for a New Drug Application (NDA) (or its equivalent) in South Korea with respect to Phenserine for the treatment of AD. The financial terms of the deal include royalty payments to us based on sales of Phenserine by Daewoong in the South Korean market.

          In January 2006, we announced the completion of a single ascending dose Phase I trial with Posiphen™, in clinical development for the treatment of AD progression. This double-blind, placebo controlled study of Posiphen™ in healthy men and women sought to establish well tolerated doses. Posiphen™ appears to be well tolerated at single doses up to and including 80mg. Blood levels of Posiphen™ associated with this study were higher than those associated with beneficial effects on beta-amyloid metabolism in animal models. The build-up of beta-amyloid (Ab) is generally believed to be causative of the dementia of AD. No serious adverse events were reported at any dose level.

          We announced in January of 2006 that three presentations of data on our drug development candidate, Phenserine, and one presentation of data on our drug development candidate, Posiphen™, will be made at the 9th International Geneva/Springfield Symposium on Advances in Alzheimer Therapy in Geneva, Switzerland, being held April 19-22, 2006.

          In February 2006, we reported a statistically significant reduction in the plasma levels of beta-amyloid 1- 42 (AB-42) in healthy subjects treated with Phenserine for 35 days, in a previously conducted Phase I study.

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