#$%^&*AU2014227539A120141009.pdf#####ABSTRACT The present invention provides an antibody to human IL-3Rc chain, which does not inhibit IL-3 signaling and binds to B domain of the human IL-3RaX chain but 5 does not bind to C domain of the human IL-3Ra chain a composition for preventing or treating a blood tumor in which a cell expressing IL-3Rax is found in bone marrow or peripheral blood of a subject, which comprises the antibody to human IL-3RcL as an active ingredient and a method for treating a blood tumor in which a cell expressing IL3Rc is found in bone marrow or peripheral blood, which comprises administering, to a 10 subject, a composition comprising the IL-3Ra antibody as an active ingredient. 98
