Prolonged Response of Metastatic Programmed Death-Ligand 1 (PD-L1) Negative Basaloid Squamous Cell Carcinoma of the Lung to Maintenance Immunotherapy

转移性程序性死亡配体1（PD-L1）阴性肺基底样鳞状细胞癌对维持性免疫疗法的长期反应