This is a prospective, single-arm, single-center, exploratory clinical trial to evaluate the efficacy and safety of the PD-1 antibody tirellizumab combined with chemotherapy monotherapy in patients with relapsed/metastatic non-small cell lung cancer. This study prospectively collected disease history, treatment history, demographic data, baseline data during treatment, each treatment visit data, efficacy data, and safety data of NSCLC patients with EGFR and ALK driver negative ECOG PS 2 scores treated with tirellizumab combined with monotherapy. The subjects did not voluntarily withdraw from the test or the researchers believed that the subjects were not suitable for further test. Each subject will be treated until the disease progresses or the toxic and side effects caused by the drugs are intolerable, and the follow-up treatment plan, treatment status and survival data of the patients still need to be collected.
