CD274 and neoplasm: Furthermore, local targeting of NAD+ salvage pathway by microparticle-mediated intratumoral delivery of NAMPT inhibitor GMX1778 induced striking immunologic changes in the tumor microenvironment of murine glioblastoma, characterized by upregulation of immune checkpoint PD-L1, recruitment of cytotoxic T cells, and reduction of tumor-associated macrophages, and potentiated checkpoint immunotherapy [114].