Inclusion Criteria:
To be eligible for this study, participants must meet all of the following criteria:
1. Aged ≥ 18 years, both male and female;
2. ECOG performance status score of 0-1;
3. Histologically or cytologically confirmed non-small cell lung cancer (NSCLC) that is locally advanced (stage IIIB/IIIC) or metastatic (stage IV) and not amenable to curative surgery and/or curative radiotherapy (with or without concurrent chemotherapy), according to the IASLC 9th edition lung cancer TNM staging system.
4. At least one measurable target lesion in the liver (according to RECIST version 1.1);
5. Has previously received EGFR-TKI therapy for locally advanced or metastatic NSCLC with treatment failure (radiographic disease progression)；
6. Life expectancy ≥12 weeks.
7. Adequate organ and bone marrow function (without receiving blood transfusion, recombinant human thrombopoietin, or colony-stimulating factor therapy within 2 weeks prior to the first dose), defined as follows:
1. Complete blood count: absolute neutrophil count (NEUT#) ≥ 1.5 × 10⁹/L; platelet count (PLT) ≥ 100 × 10⁹/L; hemoglobin ≥ 9 g/dL;
2. Liver function: aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP) ≤ 2.5 × upper limit of normal (ULN); total bilirubin (TBIL) ≤ 1.5 × ULN;
3. Renal function: creatinine clearance (Ccr) ≥ 60 mL/min (Cockcroft-Gault formula see appendix);
4. Cardiac function: left ventricular ejection fraction (LVEF) ≥ 50% as assessed by echocardiography (ECHO) or multigated acquisition (MUGA) scan;
8. Female participants of childbearing potential and male participants with partners of childbearing potential must use a medically approved contraceptive method (e.g., intrauterine device, contraceptive pills, or condoms) during the study treatment period and for 6 months after the last dose;
9. Participants voluntarily enroll in this study, sign the informed consent form, have good compliance, and cooperate with follow-up visits.
Exclusion Criteria:
Participants who meet any of the following criteria will not be enrolled in this study:
1. Histologically or cytologically confirmed presence of small cell lung cancer, neuroendocrine carcinoma, or carcinosarcoma components;
2. Previous treatment with TROP2-targeted therapy and/or topoisomerase I inhibitors;
3. Has had other malignant tumors within the past 5 years, excluding cured cervical carcinoma in situ, basal cell carcinoma of the skin, or squamous cell carcinoma of the skin;
4. Known or screening-detected symptomatic active central nervous system (CNS) metastases or carcinomatous meningitis (Note: ① Patients who have been treated and have stable disease for ≥4 weeks and have discontinued systemic corticosteroids (at any dose) for \>3 days may be enrolled. ② Patients with asymptomatic brain metastases (i.e., no neurological symptoms, no requirement for corticosteroids, and no lesion \>1.5 cm) are eligible but require regular brain imaging as part of disease site evaluation)；
5. Known history of allergy to the study drugs or their components, history of immunodeficiency, or history of organ transplantation;
6. History of (non-infectious) interstitial lung disease (ILD) or non-infectious pneumonitis requiring steroid treatment; current ILD or non-infectious pneumonitis; or suspected ILD or non-infectious pneumonitis that cannot be ruled out by imaging at screening; clinically severe pulmonary impairment due to concurrent pulmonary diseases, including but not limited to any underlying pulmonary disease (e.g., pulmonary embolism within 3 months prior to dosing, severe asthma, severe chronic obstructive pulmonary disease, restrictive lung disease, pleural effusion, etc.) or any autoimmune, connective tissue, or inflammatory disease that may affect the lungs (e.g., rheumatoid arthritis, Sjögren's syndrome, sarcoidosis, etc.), or prior pneumonectomy;
7. Active infection requiring systemic therapy within 2 weeks prior to the first dose;
8. According to the investigator's judgment, presence of concomitant diseases that seriously jeopardize patient safety or affect the patient's ability to complete the study, including but not limited to hypertension uncontrolled by medication, severe diabetes, active infection, etc;
9. Occurrence of arterial/venous thrombotic events, such as cerebrovascular accident (including transient ischemic attack, cerebral hemorrhage, cerebral infarction), deep vein thrombosis, and pulmonary embolism, within 12 weeks prior to signing the informed consent form;
10. Current active bleeding, or central lung cancer with potential for massive hemorrhage; or history of bleeding disorders (e.g., von Willebrand disease or hemophilia); clinically significant bleeding within 6 months prior to enrollment (e.g., gross hematuria, gastrointestinal bleeding, and hemoptysis); or receipt of therapeutic anticoagulants or aspirin within 14 days prior to enrollment;
11. Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to enrollment, or minor surgical procedure within 7 days prior to enrollment;
12. Documented severe dry eye syndrome, severe meibomian gland disease and/or blepharitis, or a history of corneal disease that prevents or delays corneal healing;
13. Any other conditions that, in the investigator's opinion, make the patient unsuitable for participation in this study.
