SOUTH SAN FRANCISCO, Calif., Aug. 19, 2016 (GLOBE NEWSWIRE) -- Portola Pharmaceuticals Inc.® (NASDAQ:PTLA) today announced that the MAA for IndexXa™ (andexanet alfa; trade name in the United States is AndexXa™), a Factor Xa inhibitor antidote, has been submitted to the EMA, completed the validation period, and has been accepted for review. IndexXa is in development for patients treated with a Factor Xa inhibitor when reversal of anticoagulation is needed due to life-threatening or uncontrolled bleeding and for patients requiring urgent or emergency surgery. Portola is seeking conditional approval of IndexXa in the EU through the centralized procedure. With the acceptance of the application, the EMA’s Committee for Medicinal Products for Human Use (CHMP) will now begin the centralized review procedure under a standard 210-day review period.
“An estimated 73,000 patients treated with an oral Factor Xa inhibitor will be hospitalized this year due to major bleeding or because they require urgent surgery in the EU5i. These patients are critically ill and could potentially benefit from a Factor Xa inhibitor antidote,” said Bill Lis, chief executive officer of Portola. “As there is currently no approved antidote for Factor Xa inhibitors in the EU, we are working diligently to bring IndexXa to patients. The MAA validation is an important milestone toward achieving that goal.”
Portola’s MAA submission is based on data from two Phase 3 ANNEXA™ studies that evaluated the safety and efficacy of andexanet alfa in reversing the anticoagulant activity of the Factor Xa inhibitors rivaroxaban and apixaban in healthy volunteers. Results of the ANNEXA studies were published by The New England Journal of Medicine. The MAA also included limited adjudicated efficacy and safety data from initial patients enrolled in the ongoing ANNEXA-4 study. Portola is currently evaluating andexanet alfa in this global, Phase 3b/4 single-arm, open-label study in patients receiving apixaban, rivaroxaban, edoxaban or enoxaparin who present with an acute major bleed. The study is enrolling patients in the United States, Canada and the EU.
On August 17, 2016, Portola received a Complete Response Letter (CRL) from the U.S. Food and Drug Administration (FDA) regarding its Biologics License Application (BLA) for AndexXa. The Company plans to meet with the FDA as soon as possible in order to resolve the outstanding questions in the CRL and determine appropriate next steps.
The Urgent Need for a Factor Xa Inhibitor Antidote
Annually, 1 to 4 percent of patients treated with Factor Xa inhibitors may experience major bleeding, and an additional one percent may require emergency surgery. Commensurate with the increase in the use of Factor Xa inhibitors -- for stroke prevention in atrial fibrillation; treatment and prevention of deep vein thrombosis (DVT) and pulmonary embolism; and prevention of DVT following knee or hip replacement surgery -- the number of hospital admissions due to bleeding associated with these agents continues to grow. In the EU5 an estimated 73,000 oral Factor Xa inhibitor-treated patients will be hospitalized this year due to major bleeding or will require urgent surgery.ii
IndexXa, an investigational drug, is a modified human Factor Xa molecule that acts as a decoy to target and sequester with high specificity both oral and injectable Factor Xa inhibitors in the blood. Once bound, the Factor Xa inhibitors are unable to bind to and inhibit native Factor Xa, thus potentially allowing for the restoration of normal hemostatic processes. IndexXa is the first compound being studied as an antidote for Factor Xa inhibitors that directly and specifically reverses anti-Factor Xa activity – the anticoagulant mechanism of these agents.
About Portola Pharmaceuticals, Inc.
Portola Pharmaceuticals is a biopharmaceutical company developing product candidates that could significantly advance the fields of thrombosis and other hematologic diseases. The Company is advancing three programs, including betrixaban, an oral, once-daily Factor Xa inhibitor; IndexXa™ (andexanet alfa), a recombinant protein designed to reverse the anticoagulant effect in patients treated with an oral or injectable Factor Xa inhibitor; and cerdulatinib, a Syk/JAK inhibitor in development to treat hematologic cancers. Portola's partnered program is focused on developing selective Syk inhibitors for inflammatory conditions. For more information, visit www.portola.com and follow the Company on Twitter @Portola_Pharma.
Statements contained in this press release regarding matters that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Such statements include, but are not limited to, statements regarding the potential future regulatory approval of andexanet alfa and patient populations that could benefit from a Factor Xa inhibitor reversal agent. Risks that contribute to the uncertain nature of the forward-looking statements include the risk that we may be unable to satisfy regulatory requirements for such approval, we may be unable to manufacture andexanet alfa on a commercial scale and we will need additional capital to fund our operations. These and other risks and uncertainties are described more fully in our most recent filings with the Securities and Exchange Commission, including our most recent quarterly report on Form 10-Q, which was filed on August 9, 2016. All forward-looking statements contained in this press release speak only as of the date on which they were made. We undertake no obligation to update such statements to reflect events that occur or circumstances that exist after the date on which they were made.
i France, Germany, Italy, Spain and the United Kingdom
ii Portola estimate based on IMS reported oral Factor Xa inhibitor sales in the EU5
Source:Portola Pharmaceuticals, Inc.