Inclusion Criteria:
Subjects Should have been previously treated with a third-generation EGFR TKI with disease progression. Subjects with positive other driver genes or METex14 mutations are required to undergo targeted therapy and disease progression.
Exclusion Criteria:
Received live vaccines within 4 weeks prior to first administration of the study drug or plan on receiving any live vaccine during the study.Patients are allowed to receive inactivated vaccines.
Uncontrolled diseases including:
* Infection requiring systemic antibiotics, antivirals or antifungals within 2 weeks prior to first dose of the study drug（ antiviral medication for hepatitis B and hepatitis C infection that are compliant with the protocol were allowed）;
* Known human immunodeficiency virus (HIV) infection, or HIV positive (HIV 1/2 Ab positive);
* Acute or chronic active hepatitis B (HbsAg positive and/or HbcAb positive with HBV DNA titer ≥ 104 copies/mL or ≥ 2000 IU/mL or higher than lower limit of detection) or C (HCV Ab positive with HCV RNA titer \> 103 copies/mL or higher than lower limit of detection);
* Active COVID-19 infection with obvious symptoms requiring treatment or hospitalization, such as pyrexia, dyspnea, nausea, vomiting, diarrhea, etc.;
* Active tuberculosis infection, or still on anti-tuberculosis therapy or received anti tuberculosis therapy within 1 year prior to first administration of the study drug;
* Active syphilis infection or latent syphilis requiring treatment;
* Symptomatic congestive heart failure Grade II-IV (New York Heart Association \[NYHA\]), symptomatic or uncontrolled arrhythmias, QTc interval \> 480 ms or personal or family history of congenital long/short QT syndrome;
* Hypertension that does not receive standardized therapy or still uncontrollable hypertension (SBP ≥ 160 mmHg or DBP ≥ 100 mmHg); Any history of life-threatening hemorrhage, or hemorrhage requiring (including but not limited to gastrointestinal bleeding, hemoptysis, etc) blood transfusion, endoscopy, or surgery, within 3 months prior to the first administration of study drug;
