Allterum Therapeutics Inc. has obtained IND clearance from the FDA for 4A10, paving the way for initiation of a first-in-human phase I trial in patients with relapsed or refractory acute lymphoblastic leukemia (ALL). 4A10 is a monoclonal antibody with a human immunoglobulin G subclass 1 (IgG1) backbone that specifically binds to CD127 (IL-7Rα).