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ECOG PS: Eastern Cooperative Oncology Group performance status; EGFR: epidermal growth factor receptor; PD-1: programmed cell death 1; PD-L1: programmed cell death 1 ligand; VEGFR: vascular endothelial growth factor receptor. aEsophagus (2 patients) and maxilla (1 patient). bDiagnosis confirmed at another hospital. *American Joint Committee on Cancer 8th edition.
