Spatial Fragmentation Combined With Low-dose Radiotherapy for Immunotherapy Combined With Chemotherapy-resistant Locally Advanced or Advanced Non-small Cell Lung Cancer

Inclusion Criteria: 1. Sign the informed consent form. 2. Be at least 18 years old. 3. Have a Karnofsky Performance Status (KPS) score of 70 or higher and an expected survival of more than 3 months. 4. Have histopathological evidence of small cell lung cancer, lung adenocarcinoma, or lung squamous cell carcinoma. 5. Have received prior immunotherapy and experienced disease progression. 6. The site targeted for radiotherapy has not been previously irradiated or it has been at least 6 months since the last radiotherapy. Exclusion Criteria: 1. The patient has lesions that are not suitable for radiotherapy: malignant pleural effusion, ascites, meningeal metastasis, etc. 2. The patient has other serious comorbidities, such as myocardial infarction occurring within 6 months, severe arrhythmia, mental illness, etc., is unable to complete the treatment, or has an expected survival period of less than 3 months. 3. The patient has severe organ dysfunction, such as liver failure, cardiopulmonary failure, etc., and is difficult to tolerate radiotherapy. 4. The patient currently has a severe infection. 5. The patient has a known or suspected active autoimmune disease (congenital or acquired), such as uveitis, enteritis, hepatitis, hypophysitis, vasculitis, nephritis, thyroiditis, etc. (Patients with vitiligo or those with cured childhood asthma can be included; patients with type 1 diabetes who have good insulin control can also be included). 6. The patient has experienced grade 3 or above cardiac or liver toxicity reactions or grade 4 toxicity reactions in other organs during previous immunotherapy. 7. Other situations where reviewers consider there are sufficient reasons for disqualification from the registered study: such as potential situations inconsistent with the clinical protocol.