Inclusion Criteria:
1. Voluntarily sign informed consent;
2. Treatment naive serous effusion of patients with adenocarcinoma without activating gene mutation.
3. Eastern Cooperative Oncology Group (ECOG) score ≤ 2;
4. Survival is expected to exceed 3 months
Exclusion Criteria:
* The subject had received anti-vascular endothelial growth factor (VEGF) small molecule tyrosine kinase inhibitors or monoclonal antibodies in the past 4 weeks; The subject had participated any clinical trials in the past 4 weeks; The subject had previously received bevacizumab of pleural perfusion therapy;
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; Hypertension cannot be controlled by drugs; 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; 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; Imaging (CT or chest radiograph) showed significant pneumothorax, fluid pneumothorax; Bilateral pleural cavity to a large number of effusion or encapsulated pleural effusion; Obvious cough blood in 6 months, or daily hemoptysis amounted to half a teaspoon (2.5ml) or more; 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; Thrombosis, cancer thrombosis (including arteriovenous thrombosis, tumor thrombus, pulmonary embolism, transient ischemic attack, etc.) occurred within 12 months; There are gastrointestinal obstruction, peptic ulcer, Crohn's disease, ulcerative colitis and other gastrointestinal diseases or other diseases may cause gastrointestinal bleeding or perforation; Severe respiratory diseases, or need long-term oxygen, corticosteroid treatment of diseases such as chronic obstructive pulmonary disease, interstitial lung disease and respiratory failure; The toxicity of previous antineoplastic therapies has not yet recovered to below grade 2 or has not fully recovered; Patients with uncontrolled central nervous system metastasis; There are serious uncontrolled systemic diseases, such as nephrotic syndrome, infection, poorly controlled diabetes; Patients with active HIV（human immunodeficiency virus）, HBV（hepatitis B virus）, or HCV（hepatitis C virus） infection; Patients had undergone surgery (\<28 days) or did not heal completely, or had other unhealed wounds before the study; Patients known to be allergic to bevacizumab or any of the components of the drug; Pregnant or lactating female patients, or unwilling to take contraceptive measures of reproductive age patients (including men); There is a serious psychological or mental abnormality, or lack of compliance; The investigator determines other circumstances that may affect the conduct of clinical studies and the determination of findings.
