Real World Study of Platinum Containing Dual Drug Chemotherapy Followed by Large Fractionated Radiotherapy Combined withTislelizumab in Stage IIIB/C-IV Non-small Cell Lung Cancer Patient

The enrolled population consists of patients with stage IIIB/C-IV non-small cell lung cancer who are driver gene negative or unknown, as well as those with driver gene positive targeted drug resistance. The patients reaching SD, PR, or CR after 4 cycles of platinum based dual drug chemotherapy. The patient will receive SBRT radiotherapy combined with Tislelizumab treatment, followed by Tislelizumab maintenance therapy.