Emergence of lung cancer with a low PD-L1 expression level after the administration of immune check point inhibitor for lung adenocarcinoma with a high PD-L1 expression level: A case report

一例PD-L1高表达肺腺癌患者接受免疫检查点抑制剂治疗后出现PD-L1低表达肺癌的病例报告