PDCD1 and neoplasm: However, it has been demonstrated with a fluorescently labeled program cell death protein 1 (PD-1) monoclonal antibody conjugated to the PD-1+ tumor infiltrating CD8+ T cells, PD-1− TAMs are able to transfer fluorescent PD1 monoclonal antibodies from CD8+ T cells to themselves through the Fc gamma receptors of TAMs [64].