ALK and squamous cell carcinoma: EGFR: Epidermal growth factor receptor; ECOG: Eastern Cooperative Oncology Group; PD-L1: Programmed Death-Ligand 1; SD: Standard deviation; SCC: Squamous Cell Carcinoma; EML4-ALK: Echinoderm Microtubule-Associated Protein-Like 4–Anaplastic Lymphoma Kinase