A retrospective cohort study of PD-L1 expression in recurrent and/or metastatic squamous cell carcinoma of the head and neck (SUPREME-HN).

Pai, ; Sara, I.; Cohen, ; Ezra, ; Lin, ; Derrick, ; Fountzilas, ; George, ; Kim, ; Edward, S.; Mehlhorn, ; Holger, ; Baste, ; Neus, ; Clayburgh, ; Daniel, ; Lipworth, ; Loren, ; Resteghini, C; Shara, ; Nawar, ; Fujii, ; Takashi, ; Zhang, ; Jun, ; Stokes, ; Michael, ; Lawrence, ; David, ; Khaliq, ; Asud, ; Melillo, ; Giovanni, ; Shire, ; Norah,