Portola Pharmaceuticals Inc. announced that it has received a Complete Response Letter (CRL) from the U.S. Food and Drug Administration (FDA) regarding its Biologics License Application (BLA) for AndexXa™ (andexanet alfa). An FDA-designated Breakthrough Therapy, AndexXa is in development for patients treated with a direct (apixaban, rivaroxaban, or edoxaban) or indirect (enoxaparin) Factor Xa inhibitor when reversal of anticoagulation is needed due to life-threatening or uncontrolled bleeding. Currently, there is no FDA-approved antidote for Factor Xa inhibitors.