Cambridge, U.K.-based Astrazeneca plc and its Medimmune unit will introduce the first new drug for hairy cell leukemia (HCL) in more than two decades, with the FDA's approval Thursday for Lumoxiti (moxetumomab pasudotox-tdfk). The CD22-targeted cytotoxin is indicated for adults with relapsed or refractory disease who have received at least two prior systemic therapies, including a purine nucleoside analogue.