Inclusion Criteria:Voluntary signed written Informed Consent Form (ICF). Age $\\ge 75$ years, male or female. Eastern Cooperative Oncology Group (ECOG) performance status score of 0-2. Expected survival time $\\ge 3$ months. Histologically or cytologically confirmed non-small cell lung cancer (NSCLC). Unresectable locally advanced (Stage IIIB/IIIC) or metastatic (Stage IV) NSCLC that cannot receive radical concurrent/sequential chemoradiotherapy (according to the AJCC/UICC 8th TNM staging). No EGFR sensitive mutations or ALK gene translocations. (Non-squamous NSCLC patients must provide prior tissue test reports; squamous NSCLC patients with unknown status do not require testing and are regarded as negative). Intolerant to or refusing chemotherapy/radiotherapy. At least one measurable target lesion per RECIST v1.1 that can be accurately measured repeatedly. Brain metastases are permitted. Adequate organ function (without blood components or growth factors within 7 days prior to treatment):Hematology: Absolute Neutrophil Count (ANC) $\\ge 1.5 \\times 10\^9/\\text{L}$; Platelets $\\ge 100 \\times 10\^9/\\text{L}$; Hemoglobin $\\ge 90\\text{ g/L}$. Renal: Calculated Creatinine Clearance (CrCl) $\\ge 50\\text{ mL/min}$ (Cockcroft-Gault formula); Urine protein $\\le 1+$ or 24-hour urine protein $\< 1.0\\text{ g}$. Hepatic: Total Bilirubin (TBil) $\\le 1.5 \\times \\text{ULN}$; AST and ALT $\\le 2.5 \\times \\text{ULN}$ ($\\le 5 \\times \\text{ULN}$ for patients with liver metastases); Serum Albumin $\\ge 28\\text{ g/L}$. Coagulation: International Normalized Ratio (INR) and Activated Partial Thromboplastin Time (APTT) $\\le 1.5 \\times \\text{ULN}$. Cardiac: Left Ventricular Ejection Fraction (LVEF) $\\ge 50\\%$. Exclusion Criteria:Histopathological components of small cell lung cancer. Known driver gene-positive NSCLC eligible for standard targeted therapy. Active autoimmune disease requiring systemic treatment within the past 2 years. History of immunodeficiency; positive HIV antibody test; ongoing long-term systemic corticosteroids or immunosuppressive agents. Active tuberculosis or active syphilis infection. History of allogeneic organ or stem cell transplantation. History or current presence of non-infectious pneumonitis/interstitial lung disease requiring systemic glucocorticoids. Severe infection within 4 weeks prior to first dose; active infection requiring systemic anti-infective therapy within 2 weeks prior to first dose. Presence of brainstem, meningeal, or spinal cord metastases or compression. History of myocarditis, cardiomyopathy, or malignant arrhythmia; unstable angina, myocardial infarction, congestive heart failure, or vascular disease requiring hospitalization within 12 months prior to first dose. History of esophageal/gastric varices, severe ulcer, unhealed wound, gastrointestinal perforation/fistula/obstruction, or acute GI bleeding within 6 months prior to first dose. Arterial thromboembolism, Grade $\\ge 3$ venous thromboembolism, TIA, CVA, hypertensive crisis, or uncontrolled hypertension ($\\text{SBP} \\ge 160\\text{ mmHg}$ or $\\text{DBP} \\ge 100\\text{ mmHg}$) within 6 months prior to first dose. Severe bleeding tendency or coagulation disorder; clinically significant hemoptysis within 1 month prior to first dose.
