MANUFACTURING ISSUES?!  Why PORTOLA Stock Rallied? On Aug. 17, 2016, we learned that the FDA sent a Complete Response Letter (CRL) to Portola Pharmaceuticals (PTLA) regarding its Biologics License Application (BLA) for AndexXa™ (andexanet alfa), which is an antidote important for the safety use of several new Factor Xa inhibitors anticoagulants aimed at replacing Coumadin (warfarin). The Factor Xa inhibitors anticoagulants have many advantages over …