518 Discovery of MACO-355, a novel, first in mechanism ligand-blocking independent anti-LILRB1/2 monoclonal antibody for cancer therapy oleh Luca Cassetta, Carola Ries, Krzysztof B Wicher, Moritz Haneklaus, Alicia Poindron, Martha Lopez-Yrigoyen, Carmen Rodriguez Seoane, Maikel Fransen, Chantell Payton, Stephane Guillame, Stephen Myatt