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Portola Pharmaceuticals (PTLA) Stock Slumps on FDA Complete Response Letter

NEW YORK (TheStreet) -- Shares of Portola Pharmaceuticals (PTLA) were sliding 16.25% to $19.84 on heavy trading volume early Thursday afternoon after the company received a complete response letter from the FDA for its anticoagulation reversal drug, AndexXa.

The letter asks that Portola provide additional information primarily related to manufacturing of the drug.

Also, the FDA is seeking data to support the inclusion of edoxaban and enoxaparin on the drug's label.

AndexXa is a FDA-designated breakthrough therapy meant to treat patients with a...