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A.P. Pharma Has Initiated a Program to Expand Its Pipeline of Sustained Release Products

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Core Tip: A.P. Pharma, a specialty pharmaceutical company, has initiated a program to expand its pipeline of sustained release products,

A.P. Pharma, a specialty pharmaceutical company, has initiated a program to expand its pipeline of sustained release products, including a new program targeting the relief of post-surgical pain.

The company also announced it will pursue a post-approval expansion of its leading drug program for the treatment of chemotherapy-induced nausea and vomiting (CINV) with the goal of demonstrating the utility of its lead agent, Sustol(formerly known as APF530) in the treatment of delayed onset CINV in patients receiving highly emetogenic chemotherapy (HEC) agents.

Currently there is no approved 5-HT3 receptor antagonist for the treatment of delayed HEC.

A.P. Pharma CEO Dr Barry Quart noted the company continues to make significant progress toward resubmission of the NDA for Sustol targeted for the end of the first quarter 2014.

"Our plan to initiate a new clinical trial to further expand the potential label is an indicator of our high level of confidence in this product and is part of a broader plan to build a CINV franchise.

"With the anticipated FDA approval of our lead product, it will be much more efficient to develop and register other drugs utilizing the same proprietary, Biochronomer, sustained-release technology.

"We are very excited to move our most advanced program for post-surgical pain relief into full-scale development. This product candidate has the potential to significantly reduce the need for opiates post-surgery and reduce the length of hospital stay post-surgery," Dr Quart added.

A.P. Pharma's pain relief program utilizes the company's polymer-based Biochronomer drug delivery platform to continuously release anesthetic agents directly at the source of pain over a period of several days.

The company is targeting a prolonged period of anesthetic release such that therapeutic concentrations of active drug are achieved rapidly and maintained for at least 72 hours.

The potential benefit of A.P. Pharma's prolonged release profile is to achieve rapid pain relief, maintaining higher levels of active drug at the site of the pain over time to potentially provide greater relief from pain, and to maintain pain relief for up to five days following surgery.

The current market leader, Exparel, reduced mean pain intensity only during the first 24 hours following study drug administration; between 24 and 72 hours after study drug administration, there was minimal to no difference between EXPAREL and placebo treatments.

In animal models, the company has demonstrated continuous release of the pain-relieving agent bupivacaine for more than seven days and release of the agent ropivacaine for greater than five days.

Bupivacaine and ropivacaine are well established anesthetic agents that provide short term pain relief. Based on the superior profile of ropivacaine, the company is focusing its development efforts on this anesthetic agent.

A.P. Pharma expects to move its pain program into human clinical trials in 2014. The company will pursue approval utilizing the Food and Drug Administration's 505(b)(2) approval process, which provides for much faster and less costly development than traditional drug approval.

In 2012, approximately 24.8 million procedures were performed that were associated with post-operative pain.

With the goal of addressing this significant unmet medical need and to further differentiate Sustol from all other 5-HT3 antagonists, A.P. Pharma plans to initiate a clinical study in 2014 designed to establish the utility of Sustol in the treatment of delayed onset CINV in patients receiving HEC regimens.

The randomized two-arm study will compare approximately 500 HEC administered patients receiving Sustol plus the NK-1 inhibitor fosaprepitant to a similar number of HEC administered patients receiving ondansetron plus fosaprepitant.

The company expects this study to complete following the resubmission and resulting PDUFA date for Sustol. If the study is successful, the company will seek to expand the Sustol label (if approved) to incorporate delayed HEC treatment on a post-approval basis.

In another example of the utility of the company's Biochronomer platform, the company has demonstrated in animal models the simultaneous and prolonged release of three drugs commonly administered individually for the treatment of CINV.

In this study, the company combined granisetron, dexamethasone and an NK-1 inhibitor to achieve desired pharmacokinetic levels of these drugs over a period of five days. The company is evaluating this three-drug combination as a potential lifecycle extension to its lead program for the treatment of CINV.

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