CD274 and neoplasm: In conclusion, Ad3-based viruses, be it replication-incompetent or competent, seem very useful in promoting antitumor effector T cell responses either via oncolysis or targeting to DCs and could be used combined with immune checkpoint inhibitors like anti-CTLA-4 or anti-PD(L)-1 to overcome the suppression of tumor-specific T cells during the priming phase (anti-CTLA-4) or the effector phase in the tumor microenvironment (anti-PD-(L)1).