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Arcion Therapeutics' Topical Gel Candidate, ARC-4558, Demonstrates Significant Pain Reduction in Phase 2b Trial for Painful Diabetic Neuropathy (PDN)

Tue, 07/20/2010 - 5:33am
Bio-Medicine.Org

BALTIMORE, July 20 /PRNewswire/ -- Arcion Therapeutics, a venture backed clinical stage biotechnology company developing topical therapies for chronic pain, today announced top-line results from a successful Phase 2b double-blind, randomized, placebo-controlled clinical trial of its lead topical pain candidate, ARC-4558, in adult patients with painful diabetic neuropathy (PDN).  Arcion recently held an End of Phase 2 meeting with the United States Food and Drug Administration (FDA) and the ARC-4558 program is now poised to enter Phase 3 studies. ARC-4558 is a 0.1% gel formulation of clonidine hydrochloride for topical administration.

The study results successfully demonstrated therapeutic potential for treating PDN with ARC-4558 by targeting abnormal nerve signaling at the level of the skin with a 0.1% topical gel formulation of clonidine.  ARC-4558 was most effective in reducing pain in subjects with evidence of preserved nociceptors (nerve fibers responsible for pain signaling) in the skin.  In subjects with at least minimal nociceptor function, ARC-4558 was significantly more effective in reducing pain than placebo (p<0.05). The significance of the response increased with higher levels of nociceptors in the subject's skin (p<0.005).  ARC-4558 did not demonstrate efficacy in subjects lacking evidence of preserved nociceptor function.  

The ITT (intent to treat) population was comprised of a mix of subjects in which about half had little or no nociceptor preservation and therefore the pooled results were not significant.  Plasma levels of clonidine were consistently

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