A Phase II Clinical Trial of Ivonescimab Plus Third-generation EGFR-TKIs in Advanced Non-small Cell Lung Cancer With Gradual or Potential Progression After EGFR-TKIs Treatment

Inclusion Criteria: * 1\. Voluntarily signed written informed consent form; 2. Age ≥ 18 years; 3. Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1; 4. Expected survival ≥ 3 months; 5. Histologically or cytologically confirmed locally advanced (stage IIIB/IIIC) or metastatic (stage IV) non-squamous non-small cell lung cancer (NSCLC), which is unresectable for complete surgical resection and not eligible for radical concurrent/sequential chemoradiotherapy, staged per the 8th edition TNM Staging for Lung Cancer released by the Union for International Cancer Control (UICC) and American Joint Committee on Cancer (AJCC); 6. Positive EGFR sensitive activating mutation confirmed by tumor histology, cytology or hematology testing before enrollment, including exon 19 deletion (19Del) and exon 21 point mutation (L858R); patients with EGFR T790M mutation are also eligible for enrollment; 7. Developed slow progression or potential progression during EGFR-TKI therapy: 8. Presence of at least one measurable lesion; 9. Normal function of major organs, meeting all the following criteria: Routine blood test results meet the requirements (no blood transfusion, no use of hematopoietic growth factors, no drug correction within 14 days before testing): a. Absolute neutrophil count (ANC) ≥ 1.5×10⁹/L (1,500/mm³); b. Platelet count (PLT) ≥ 90×10⁹/L (90,000/mm³); c. Hemoglobin (HB) ≥ 90 g/L; 10. Biochemical test results meet the following criteria: 1. Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤ 2.5×ULN; 2. Serum albumin (ALB) ≥ 28 g/L; 3. Serum creatinine (sCr) ≤ 1.5×ULN; urine protein \< 2+ or 24-hour urinary total protein quantification \< 1.0 g (creatinine clearance calculated per Cockcroft-Gault formula); Coagulation function meets the requirements: International Normalized Ratio (INR) ≤ 1.5×ULN and activated partial thromboplastin time (APTT) ≤ 1.5×ULN; Exclusion Criteria: \-