A Study of Furmonertinib Combined With Radiotherapy for Non-small Cell Lung Cancer With Oligoprogression

Inclusion Criteria: * Patients with locally advanced or metastatic NSCLC who are diagnosed by histology or cytology and are not suitable for surgery or radiotherapy; * After receiving the first or second generation of EGFR-TKI treatment, the disease is oligoprogressive with 3-5 lesions (with imaging evidence), and the mutation is T790M+ (histological or hematological specimens, ARMS detection method); * After receiving osimertinib treatment in the past, the disease is oligoprogressive with 3-5 lesions (with imaging evidence), and the patient refused chemotherapy; * 18-80 years old; * ECOG PS 0-2 scores; * Organ and bone marrow functions were generally normal within 30 days before enrollment, including:AST, ALT ≤ 2.5 × ULN or ≤ 5 × ULN (with liver metastasis); total bilirubin ≤ 1.5 × ULN; neutrophils absolute value ≥ 1500 cells/mm3; Creatinine clearance ≥45 mL/min; Platelets ≥ 100,000 cells/mm3; Hemoglobin ≥90g/L. * The baseline has measurable lesions defined by the RECIST 1.1 standard, and the progressive lesions should be treated with local radiotherapy; the definition of the lesion number includes: 1. When there are lesions on both adrenal glands, it is considered to be 2 metastases; 2. Two consecutive vertebral lesions and a paravertebral lesion within 6 cm can be considered as one metastasis, and the non-contiguous vertebral lesions should be counted separately; 3. The adjacent lesions in the liver, lung, and mediastinum can be considered as a metastasis if one isocenter can be used for irradiation; 4. Intracranial lesions are counted as 1 metastasis. * The patient signed an informed consent form. Exclusion Criteria: * Severe or uncontrolled hypertension, diabetes, coronary artery stenosis, aortic dissection, aneurysm or acute bleeding disease; * Any situation that increases the risk of QTc prolongation or arrhythmia; * Left ventricular ejection fraction \<50%; * History of interstitial lung disease; * FEV1%\<30% or DLCO%\<40%; * Insertion of EGFR exon 20; * The researcher believes that the patient is inappropriate to participate in this trial.