Cooley advised Y-mAbs Therapeutics, a commercial-stage biopharmaceutical company focused on the development and commercialization of antibody-based therapeutics for the treatment of cancer, on its definitive merger agreement with SERB Pharmaceuticals. Under the agreement, SERB will acquire Y-mAbs, including its lead commercial oncology asset, DANYELZA, in an all-cash transaction representing an equity value of approximately $412 million.