(HealthDay)—Lumoxiti (moxetumomab pasudotox-tdfk) injection has been approved to treat certain instances of relapsed or refractory hairy cell leukemia (HCL), the U.S. Food and Drug Administration said yesterday. Lumoxiti, a CD22-directed cytotoxin, was approved for adults who have had at least two prior therapies for the disease. The FDA granted this application Fast Track and Priority Review designations. Lumoxiti also...