Efficacy and Safety of Use of Platinum Based Doublet Chemotherapy Plus Antiangiogenesis and Immune Checkpoint Inhibitors in Patients With Advanced Non-squamous Non-small Cell Lung Cancer

Inclusion Criteria: 1. Voluntarily sign informed consent; 2. Non-squamous non-small cell lung cancer, newly diagnosed or previously not treated with systemic chemotherapy and / or epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors treatment; 3. Aged 18-75 years; 4. Eastern Cooperative Oncology Group (ECOG) score ≤ 2; 5. Survival is expected to exceed 12 weeks ; 6. Patients had a wild-type genotype (WT population; patients with EGFR or ALK genetic alterations were excluded) Exclusion Criteria: If any of the following criteria is met, the subject shall be excluded: 1. Squamous cell carcinoma (including adenosquamous carcinoma) and small cell lung cancer (including small cell carcinoma and non-small cell mixed lung cancer); 2. In the past 2 weeks, there have been systematic anti-tumor treatment including chemotherapy (including thoracic chemotherapy), radiotherapy (excluding radiotherapy of metastatic lesions outside the thoracic radiation field), targeted therapy, immunotherapy and biotherapy; 3. The subject had received anti-vascular endothelial growth factor (VEGF) small molecule tyrosine kinase inhibitors or monoclonal antibodies in the past 4 weeks; 4. Laboratory results: * White blood cell count \<3 × 109 / L, neutrophil count \<1.5 × 109 / L, platelet \<75 × 109 / L, or hemoglobin \<8g / dL; * Coagulation abnormalities (INR \> 1.5 or prothrombin time (PT) \> ULN + 4 seconds or activated partial thromboplastin time (APTT) \> 1.5 ULN), with bleeding tendency or being treated with thrombolysis or anticoagulation; * Serum total bilirubin ≥1.5 ULN; alanine aminotransferase (ALT) or aspartate aminotransferase (AST) ≥ 2.5 ULN in the absence of liver metastases; ALT or AST ≥5 ULN in liver metastases; * Serum albumin \<30g / L; * Serum creatinine ≥ 1.5 ULN or creatinine clearance \<40ml / min; • Urine routine urinary protein ≥ ++, or 24 hours urine protein ≥ 1.0 g; 5. Heart disease with significant clinical symptoms, such as: congestive heart failure, coronary heart disease with symptom, arrhythmia hardly be controlled by drugs, myocardial infarction in 6 months, or heart failure; 6. Imaging (CT or MRI) showed a tumor lesion 5 mm away from the large vessels, or the presence of invasive central vasculature of the central tumor; imaging (CT or MRI) showed significant cavitation or necrosis of the lung tumor; Other diseases that may cause haemoptysis; 7. Imaging (CT or chest radiograph) showed significant pneumothorax, fluid pneumothorax; 8. Obvious cough blood in 6 months, or daily hemoptysis amounted to half a teaspoon (2.5ml) or more; 9. Significant bleeding symptoms or with definite bleeding tendency within 12 months before randomization, such as gastrointestinal bleeding, hemorrhagic gastric ulcer, occult blood ++ and above, intracerebral hemorrhage, vasculitis, or with congenital or acquired coagulopathy disorders; 10. Thrombosis, cancer thrombosis (including arteriovenous thrombosis, tumor thrombus, pulmonary embolism, transient ischemic attack, etc.) occurred within 12 months; 11. There are gastrointestinal obstruction, peptic ulcer, Crohn's disease, ulcerative colitis and other gastrointestinal diseases or other diseases may cause gastrointestinal bleeding or perforation; 12. Severe respiratory diseases, or need long-term oxygen, corticosteroid treatment of diseases such as chronic obstructive pulmonary disease, interstitial lung disease and respiratory failure; 13. Patients with uncontrolled central nervous system metastasis; 14. There are serious uncontrolled systemic diseases, such as nephrotic syndrome, infection, poorly controlled diabetes; 15. Patients with active HIV（human immunodeficiency virus）, HBV（hepatitis B virus）, or HCV（hepatitis C virus） infection; 16. Patients had undergone surgery (\<28 days) or did not heal completely, or had other unhealed wounds before the study; 17. Patients known to be allergic to bevacizumab or any of the components of the drug; 18. Pregnant or lactating female patients, or unwilling to take contraceptive measures of reproductive age patients (including men); 19. There is a serious psychological or mental abnormality, or lack of compliance; 20. The investigator determines other circumstances that may affect the conduct of clinical studies and the determination of findings; 21. Participants with an active, known or suspected autoimmune disease; 22. Participants with a condition requiring systemic treatment with either corticosteroids or other immunosuppressive medications within 14 days of first treatment; 23. Participants with interstitial lung disease that is symptomatic or may interfere with the detection or management of suspected drug related pulmonary toxicity.