CD274 and neoplasm: Exosomes from ID8-miR-con cells (Exo-miR-con) or exosomes from ID8-miR-155 cells (Exo-miR-155) were administered every 3 days, with anti-PD-L1 or anti-IgG antibodies administered starting at 60 days after tumor inoculation (Fig. 7B).