Nintedanib

This study is aimed at patients with unresectable NSCLC who take nintedanib during sequential radiotherapy to explore the incidence of radiation pneumonitis above grade 2 in the nintedanib combined with radiotherapy mode and observe safety. And will further explore the progression-free survival (PFS) and overall survival (OS) of patients treated with nintedanib in combination with radiotherapy and immunotherapy. Primary objective: To evaluate the safety of nintedanib combined with sequential radiotherapy in patients with unresectable NSCLC and the incidence of radiation pneumonitis above grade 2. Secondary objective: To evaluate the changes in lung function, progression-free survival (PFS) and overall survival (OS) in patients with unresectable NSCLC after nintedanib combined with sequential radiotherapy. Patients need to receive induction therapy, chemotherapy and/or immunotherapy for at least one cycle. Then they will receive sequential radiotherapy and nintedanib for 6 months. Finally, they will receive immunotherapy maintenance therapy for 16 cycles.