CD8A and neoplasm: To study the kinetics of T cell recruitment into tumors in individual mice following adoptive T cell therapy, we labeled F5 CD8+ T cells ex vivo with 89Zr oxine, as described previously for human T cells (35, 36), and injected 89Zr-labeled T cells to tumor bearing mice following the normal conditioning protocol of sub-lethal irradiation and peptide vaccination.