629 Neoadjuvant SEMA4D inhibitor pepinemab combination with nivolumab increases crosstalk between B cell and CD26hi T cell in patients with resectable stage III melanoma by Brian Burns, Elizabeth Evans, Ragini Kudchadkar, Crystal Mallow, Christine Reilly, Maurice Zauderer, Gregory B Lesinski, Keith A Delman, Chrystal M Paulos, Brian Olson, Terrence Fisher, Jayden Kim, Michael C Lowe, Ayana T Ruffin, Jacklyn Hammons, Agnes Harutyunyan, Melinda Yushak, Ali Mokhtari, Douglas Parker