Proteon Therapeutics Announces Publication in the Journal of Cardiovascular Pharmacology of Promising Nonclinical Results for Vonapanitase in Peripheral Artery Disease
The study, titled "Recombinant Human Elastase Alters the Compliance of Atherosclerotic Tibial Arteries After Ex Vivo Angioplasty", was published in the
PAD is often caused by atherosclerosis and can frequently occur in the tibial arteries, which are located below the knee and supply blood to the lower leg and foot. This study was designed to compare the effects of vonapanitase and placebo on excised atherosclerotic human tibial arteries following ex vivo angioplasty. Assessments included elastin content in the arterial wall and arterial compliance, which is a measure of an artery's ability to expand with changes in blood pressure. Data from the study demonstrated that vonapanitase treatment ex vivo reduced elastin content by 60% compared to placebo and altered arterial compliance. Increased compliance is known to correlate with arterial dilation.
"Current interventional treatments for patients with PAD below the knee, such as balloon angioplasty, lack durability," said
This study supports other clinical and nonclinical results evaluating the potential use of vonapanitase in PAD. Proteon announced in August of 2015 the completion of a Phase 1 PAD clinical study indicating that catheter-based administration of vonapanitase using the Mercator MedSystems Bullfrog® Micro-Infusion Device to the superficial femoral or popliteal artery following angioplasty was generally well tolerated and technically feasible. Proteon announced in January of 2015 the publication of nonclinical data demonstrating that vonapanitase treatment of atherosclerotic human tibial arteries ex vivo without prior angioplasty resulted in an increase in artery diameter.
Based on these data and other nonclinical results, Proteon expects to initiate two Phase 1 clinical studies in PAD in 2016. Proteon is also currently conducting two Phase 3 multicenter, randomized, double-blind, placebo-controlled clinical studies of vonapanitase in patients with chronic kidney disease (CKD) undergoing surgical creation an arteriovenous fistula (AVF) for hemodialysis vascular access. Data from the first Phase 3 study is expected in December of 2016.
About Peripheral Arterial Disease
Peripheral artery disease (PAD) is characterized by atherosclerosis in the arteries of the legs, which leads to poor blood flow. Patients with PAD may experience muscle pain during walking, suffer from ulcers that are slow to heal or, in the most severe cases, require amputation. PAD affects eight million Americans and is a significant cause of both morbidity and mortality (source:
Vonapanitase (formerly PRT-201) is an investigational drug intended to improve arteriovenous fistula (AVF) patency, the period of time during which an AVF remains open with adequate blood flow to enable hemodialysis. Vonapanitase is applied in a single administration and is currently being studied in two Phase 3 clinical trials in patients with chronic kidney disease (CKD) undergoing surgical creation of a radiocephalic AVF for hemodialysis. Vonapanitase has received fast track and orphan drug designations from the
Cautionary Note Regarding Forward-Looking Statements
This press release contains statements that are, or may be deemed to be, "forward-looking statements." In some cases these forward-looking statements can be identified by the use of forward-looking terminology, including the terms "believes," "estimates," "anticipates," "expects," "plans," "intends," "may," "could," "might," "will," "should," "approximately," "potential," or, in each case, their negatives or other variations thereon or comparable terminology, although not all forward-looking statements contain these words. These statements, including those regarding the potential surgical and endovascular applications for PRT-201, the expected timing of the Phase 1 studies in PAD, the potential treatment of renal and vascular diseases with PRT-201, the effect of PRT-201 in patients with CKD, and those relating to future events or our future financial performance or condition, involve substantial known and unknown risks, uncertainties and other important factors that may cause our actual results, levels of activity, performance or achievements to differ materially from those expressed or implied by these forward-looking statements. These risks, uncertainties and other factors, including whether our cash resources will be sufficient to fund the our operating expenses and capital expenditure requirements for the period anticipated; whether data from early clinical trials will be indicative of the data that will be obtained from future clinical trials; whether PRT-201 will advance through the clinical trial process on the anticipated timeline and warrant submission for regulatory approval; whether such a submission would receive approval from the