Teva and Xenon Provide Update on TV-45070 Phase 2b Study in Osteoarthritis Pain
- TV-45070 4% and 8% did not demonstrate statistically significant difference from placebo in efficacy endpoints in Phase 2b study in pain due to osteoarthritis of the knee.
- TV-45070 demonstrated a favorable safety and tolerability profile, with no drug-related serious adverse events.
- Low drug plasma levels coupled with the favorable tolerability profile support the topical application rationale and continued development in neuropathic pain.
- Teva and Xenon remain fully committed to the development of TV-45070 for neuropathic pain indications and await the results from the ongoing PHN Phase 2b study, expected in the second half of 2016.
TV-45070 is a small molecule inhibitor of the sodium channel Nav1.7 and other sodium channels, including those that are expressed in the pain-sensing peripheral nervous system. Results from this trial showed that TV-45070 4% and 8% did not demonstrate statistically significant difference from placebo in efficacy endpoints of reductions in pain due to OA.
TV-45070 did demonstrate a favorable safety and tolerability profile, with no drug-related serious adverse events. This is important given the ongoing Phase 2b study of TV-45070 in post-herpetic neuralgia (PHN). The most common adverse events were application site dermal skin reactions which were mostly mild and less frequent than seen with other topical analgesics. There were no cardiac or CNS safety issues.
"The rationale for development of TV-45070 in OA has unfortunately not been confirmed with these results. However, neuropathic pain represents a distinct mechanism of chronic pain to OA and, as such, the potential for positive study results in PHN is not impacted by these data," said
"While we are disappointed that the Phase 2b trial top-line results did not indicate efficacy in OA, Teva and Xenon have always been committed to a broad development plan for TV-45070 in both nociceptive and neuropathic pain," said Dr.
TV-45070 (formerly XEN402) is a topically applied small-molecule inhibitor of the sodium channel Nav1.7 and other sodium channels, including those that are expressed in the pain-sensing peripheral nervous system. Applied topically, TV-45070 acts locally to inhibit Nav1.7 in the skin and underlying tissue, mitigating systemic absorption and the potential risks of side-effects that accompany systemic drug metabolism. The pain target Nav1.7 was identified by Xenon using its Extreme Genetics discovery platform. Xenon developed TV-45070 through early clinical development and partnered with Teva through a collaborative development and license agreement established in 2012, providing Teva with an exclusive worldwide license to develop and commercialize TV-45070. A Phase 2b trial in PHN is currently underway, with results expected in the second half of 2016.
About the TV-45070 Osteoarthritis Phase 2b Trial
The Phase 2b osteoarthritis trial of TV-45070 was a randomized, double-blind, placebo-controlled study conducted at approximately 40 clinical sites across the US. There were three arms in the study and a total of 389 patients were randomized on a 1:1:1 basis: experimental TV-45070 4% administered twice per day; experimental TV-45070 8% administered twice per day; and placebo comparator (matched ointment without TV-45070) administered twice per day. Patients were eligible to participate in the trial if they were 40-85 years of age, had primary OA in a single knee (target knee), and met pre-specified visual analog scale (VAS) pain scores and were otherwise medically healthy. The primary endpoint of the Phase 2b trial was to evaluate the efficacy of four weeks of topical administration of TV-45070 (4% and 8% ointment) compared with placebo for the relief of symptoms of primary OA of the target knee as assessed by the change from baseline to the last five days of treatment in average evening pain score upon walking on a flat surface using Question 1 of the
Xenon is a clinical-stage biopharmaceutical company discovering and developing a pipeline of differentiated therapeutics for orphan indications that it intends to commercialize on its own and for larger market indications that the company intends to partner with global pharmaceutical companies. Xenon has built a core enabling discovery platform, referred to as Extreme Genetics®, for the discovery of validated drug targets by studying rare human diseases with extreme traits, including diseases caused by mutations in ion channels, known as channelopathies. Xenon's Extreme Genetics® platform has yielded the first approved gene therapy product in the
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