This randomized phase II study compare survival outcomes and toxicity of malignant pleural effusion stage IV non small-cell lung cancer patients Intrapleural infusion chemotherapy in combination with concurrent thoracic radiation therapy (TRT) VS not combination with concurrent thoracic radiation therapy (TRT).

Malignant pleural effusion (MPE) is a common complication of stage IV NSCLC. MPE caused by lung cancer accounts for about 1/3. According to statistics, the number of MPE cases per year in the United States exceeds 150,000. At the same time, with the development of three-dimensional radiotherapy technology, the wide application of comprehensive treatment concept, and the understanding of the relationship between different metastatic state and survival of stage IV NSCLC, prospective and retrospective studies have confirmed that systemic therapy combined with primary tumor three-dimensional radiation Treatment is more conducive to improving symptoms and prolonging survival than medication alone. Retrospective results and prospective findings have been reported from the single center of the study group [Chinese Journal of Radiation Oncology, 2011, sixth issue and the first issue of 2012], taking local three-dimensional radical radiotherapy for chemotherapy, two Complementary technological advantages can significantly prolong survival and improve quality of life, enabling some patients to achieve long-term survival. However, most of the above studies excluded patients with malignant pleural effusion. For stage IV NSCLC of malignant pleural effusion, whether the primary tumor radiotherapy can bring survival benefits, has not yet formed a unified norm and conclusion, and needs further development. the study.

Inclusion Criteria:

• Patients with pathological or cytological diagnosis, stage IV with malignant pleural effusion [UICC 2017 staging eighth edition] NSCLC patients;
• initial treatment (previously did not receive any treatment), it is recommended to complete the detection of driver genes (EGFR / ALK / ROS1) (tissue, blood);
• Age 18 to 80 years old, physical status score ECOG 0 to 2 or KPS ≥ 70 (see Annex 2); Metastatic lesions in the distant area: conscious when brain metastasis; the number of metastatic lesions in the lung does not affect lung function and may be treated with primary and/or partial metastases;
• no radiotherapy, EGFR-TKI and chemotherapy contraindications;
• primary tumor radiotherapy requires IMRT technology;
• Plan the design to give the primary tumor prescription dose (DTGTV) under the damage control threshold criteria;
• The planned dose includes 100% GTV, 90% of the prescribed dose includes 98%~100% of PTV [planned target dose (DTPTV)]; normal lung (full lung volume minus GTV volume) V20 ≤ 32%, MLD≤20Gy;
• metastatic tumor radiotherapy is a three-dimensional radiotherapy technique (IMRT/SRT/SBRT/VMAT, etc.), and large-segment radiotherapy.
• Subjects have no major organ dysfunction, or laboratory test indicators must meet the following requirements: Hematology: normal range according to laboratory standards; cardiac function: normal range; liver function: normal range; renal function: normal range Lung function: FEV1>50%, impaired light-moderate lung function.
• Informed consent (radiation, medication) before treatment;
• The patient has good compliance with the treatment and follow-up received.

Exclusion Criteria:

• Patients who do not meet the pathological type, stage, and survival status of the inclusion criteria;
• no malignant pleural effusion IV stage NSCLC;
• patients with malignant pericardial effusion; Diffuse liver metastasis, intrapulmonary metastasis and has seriously affected patients with liver and lung function;
• Patients with uncontrolled hypertension, diabetes, unstable angina, history of myocardial infarction, or symptomatic congestive heart failure or uncontrolled arrhythmias in the past 12 months; clinically diagnosed heart valve disease; • • •Active period of disease caused by bacteria, fungi or viruses; mental disorders; impaired severe lung function;
• pregnant, lactating patients;
• Patients with a history of other active malignancies other than small cell lung cancer before entering the group; non-melanoma skin basal cell carcinoma, in situ cervical cancer, and cured early prostate cancer;
• Patients with allergies and no known alternatives to known or suspected drugs in any study;
• Patients with poor compliance;
• Researchers believe that it is not appropriate to participate in this test.