Disitamab Vedotin Combined Therapy for Locally Advanced or Metastatic NSCLC Patients With HER2 Alterations

Inclusion Criteria: 1. Age: 18 (inclusive) or above, regardless of gender. 2. Histologically or cytologically confirmed locally advanced or metastatic NSCLC, not suitable for radical surgery or radiotherapy (TNM 8th Edition).". 3. Biomarker: * Arm 1: HER2 alterations, no other driver gene mutations； * Arm 2: EGFR mutations accompanied by HER2 alterations; * Arm 3: HER2 gene mutations, no other driver gene alterations; 4. Number of treatment lines: * Arm 1-2: patients who have not previously received systemic treatment for advanced diseases; * Arm3:Failed with at least one line of standard treatment or intolerance; 5. Patients who have previously undergone neoadjuvant chemotherapy, adjuvant chemotherapy, radiotherapy, or radiochemotherapy for the purpose of curing non metastatic diseases must have a disease-free interval of 6 months from the last chemotherapy and/or radiotherapy to the randomization date. 6. There is at least one measurable lesion that meets the definition of the RECIST 1.1 standard at baseline. 7. ECOG fitness status score: 0 or 1 point. 8. Estimated survival time ≥ 3 months. Exclusion Criteria: 1. Central nervous system metastasis or meningeal metastasis with clinical symptoms. 2. Have a history of autoimmune diseases, immunodeficiency, including HIV positive, or other acquired or congenital immunodeficiency diseases, or a history of organ transplantation. 3. Active hepatitis B (hepatitis B virus titer\>1000 copies/ml or 200 IU/ml); Hepatitis C virus and syphilis infection. 4. Have undergone major organ surgery (excluding puncture biopsy) or have experienced significant trauma within 3 weeks before the first use of the study drug. 5. Known hypersensitivity or intolerance to any component of the study protocol drug or its excipients.