AbbVie , a global biopharmaceutical company, announced that the U.S. Food and Drug Administration (FDA) granted Breakthrough Therapy Designation for venetoclax in combination with rituximab for the treatment of patients with relapsed/refractory chronic lymphocytic leukemia (R/R CLL). Venetoclax is an inhibitor of the B-cell lymphoma-2 (BCL-2) protein being developed by AbbVie in partnership with Genentech and Roche.