815 Combination with IL-15Rβγ superagonist, Nanrilkefusp alfa, enhances CAR T and BOXR T cell anti-tumor activity by Irena Adkins, Emily Kuiper, Kathleen Whiteman, Daniel Garafola, Pratirodh Koirala, Shannon Smith, Klara Danova, Ekaterina Simonova, Lenka Palova Jelinkova, Amy Jensen-Smith