MELBOURNE, Australia, July 29, 2014 /PRNewswire/ --
- Next phase of the TPM®/Oxymorphone clinical development program has commenced
- TPM®/Oxycodone Phase 2a trial to be conducted in Australia during Q4 2014
- TPM®/Oxymorphone Phase 2 trial to be conducted in the United States in 1H 2015
Australian drug delivery company, Phosphagenics Limited (ASX: POH; OTCQX: PPGNY), today provided updates on its opioid transdermal patch programs after its recent announcement of a $19.2 million capital raising. This update is intended to provide clarity on how the Company will apply the newly raised funds to advance the development of its lead pharmaceutical assets.
Phosphagenics is developing two novel opioid products, a TPM®/Oxymorphone patch and a TPM®/Oxycodone patch. Today, both oxymorphone and oxycodone are available as oral extended release ("ER") medications for the treatment of moderate to severe chronic pain in various global markets. Given the potential competitiveness between the two molecules in the pain market, the Company has consciously formulated the two products using its TPM® drug delivery platform to treat two related but distinct pain indications. The TPM®/Oxymorphone patch has been developed for systemic delivery and treatment of moderate to severe chronic pain, while the TPM®/Oxycodone patch is for localized topical delivery and treatment of peripheral neuropathic pain.
As the Company has previously reported, U.S. sales in the extended release opioid market in 2013 were around $6 billion. Of this market, sales of transdermal patches accounted for $1.4 billion (with sales of fentanyl accounting for over 90% with the balance being for buprenorphine); sales of oxycodone were $2.9 billion and for oxymorphone around $600 million. Coincidently, the global market for peripheral neuropathic pain is also around $6 billion annually with neuropathic back pain accounting for almost 50% of this market.
Phosphagenics is pleased to announce that it is advancing its TPM®/Oxymorphone patch towards Phase 2 development. Previously, the Company reported positive results from two Phase 1 clinical trials, including a trial outcome in late 2013 that confirmed the transdermal delivery of therapeutic oxymorphone plasma concentrations, a very strong predictor of efficacy. Prior to Phase 2 initiation, the TPM®/Oxymorphone patch is being further characterized in two additional clinical studies. Data from both studies will support an investigational new drug ("IND") application that will be submitted to the US Food and Drug Administration ("FDA"). Filing an IND is the regulatory step required in order to conduct a Phase 2 trial in the USA and the IND process will add significant value to the asset.
The first additional clinical trial is currently in progress and addresses supplementary pharmacokinetic parameters to those examined in the previous trials. The second clinical trial, which is anticipated to start in October 2014, will evaluate two standard investigational endpoints for transdermal products; the consistency of the delivery profile among several potential patch application sites (i.e. flank, chest, upper arm and upper back) and the rest period required before a patch can be reapplied to the same application site. Both parameters are important aspects of protocol design for the Phase 2 trial that will be conducted in the USA, as well as forming part of the eventual label claims of the commercial product.
"The results of these two additional studies are extremely important to the Company's ongoing discussions with potential licensees, and the clinical trials add considerable value to any commercial deal for the Company," said Phosphagenics Chief Executive Officer Mr. Harry Rosen.
The strategic change in the clinical direction for the TPM®/Oxymorphone patch from a small Australian Phase 2a study to a much larger Phase 2 trial in the U.S. was announced in the Company's March 2014 Newsletter to Shareholders. This change resulted from the exceptional results obtained in our multi-dose study in late 2013 and from extensive consultation with regulatory and commercial advisors following those results. This decision was also reflective of the early interest in the product from potential licensees and the need to accelerate the development of the product in the US, the primary market for the TPM®/Oxymorphone patch.
Since the decision has been made to advance the clinical studies to the U.S., the Company has undertaken extensive work to ready itself for submitting an IND application to the U.S. FDA needed prior to commencement of the U.S. Phase 2 study in the first half of 2015.
Lee Simon MD, former head of the FDA's division of Analgesic, Anti-inflammatory and Ophthalmologic Drug Products and a consultant to the Company said, "It is entirely appropriate that the clinical program is now progressed in the U.S., which is a key commercial target market for the opioid patch technology. A successful trial in the U.S. would add significant credibility to the already informative results announced from the Phase 1 trials."
The Company is also advancing its TPM®/Oxycodone patch into Phase 2a development for the treatment of peripheral neuropathic pain. Previously, the Company has conducted several Phase 1 trials to optimize the transdermal technology. Now, the TPM®/Oxycodone patch is scheduled to re-enter the clinic in a Phase 2a study in Q4 2014, with ethics committee approval expected in October2014. This single dose proof-of-concept trial will investigate the ability of the topical application of the TPM®/Oxycodone patch to provide pain relief for patients suffering from post-herpetic neuralgia ("PHN"), a peripheral neuropathic pain condition. The study will be conducted at a number of clinical sites in Australia. Although the Company expects to complete the trial in Q2 2015, this will depend entirely on patient recruitment rates.
The Phase 2a study will help establish whether localized delivery of an opioid can relieve pain in a peripheral neuropathic pain condition. This represents a completely novel therapeutic application for an opioid and would be a valuable addition to the suite of currently available medications which have limited efficacy. In addition to neuropathic pain, the Company also intends to investigate the application of the TPM®/Oxycodone patch to other chronic localized pain conditions such as osteoarthritis of the knee. Related to that, the Company's announcement in May2014 that outlined the success of the veterinary counterpart of the TPM®/Oxycodone patch in providing pain relief to thoroughbred racehorses with shin pain provides some degree of confidence for human efficacy to non-neuropathic pain indications.The targeting of additional indications will expand the product's market potential. Any additional clinical studies would be conducted in the U.S. under an IND.