Head and Neck Squamous Cell Carcinoma (HNSCC) Clinical Trials

• Aged 18-75 years, regardless of gender; Histologically or cytologically confirmed recurrent or metastatic head and neck squamous cell carcinoma (with primary tumor sites in the oropharynx, oral cavity, hypopharynx, and larynx), with clinical or radiological progression after receiving 2 or more lines of anti-tumor systemic therapy in the recurrent or metastatic stage; ECOG performance status of 0 or 1; Expected survival period ≥ 12 weeks; At least one measurable lesion according to RECIST 1.1 criteria. Lesions that have undergone previous radiotherapy can be used as measurable lesions if disease progression occurs; Availability of tumor tissue for PD-L1 detection (paraffin-embedded specimens within 2 years or fresh tumor tissue); For patients with oropharyngeal cancer, the P16 detection status, determined by IHC method;

⁃ Normal function of major organs within 2 weeks before treatment, meeting the following criteria:

⁃ Bone marrow function: Hemoglobin ≥ 100g/L, white blood cell count ≥ 4.0×10\^9/L or neutrophil count ≥ 2.0×10\^9/L, and platelet count ≥ 100×10\^9/L without blood transfusion or colony-stimulating factor support; Liver function: Serum total bilirubin level ≤ 1.5 times the upper limit of normal, aspartate transaminase (AST) and alanine transaminase (ALT) ≤ 1.5 times the upper limit of normal; Renal function: Serum creatinine level \< 1.5 times the upper limit of normal or creatinine clearance rate ≥ 60ml/min, and blood urea nitrogen ≤ 200mg/L; Urinary protein \< +; if urinary protein is +, the 24-hour total protein must be \< 500mg; Blood glucose: Within the normal range and/or for diabetic patients, blood glucose is controlled in a stable state during treatment; Cardiac function: No myocardial infarction within 1 year; no unstable angina; no symptomatic severe arrhythmia; no cardiac insufficiency; For women of childbearing age, the serum pregnancy test result must be negative within 7 days before the first administration of the trial drug; males with reproductive capacity or females with the possibility of pregnancy must use highly effective contraceptive methods (such as oral contraceptives, intrauterine devices, abstinence, or barrier contraception combined with spermicides) throughout the trial, and continue contraception for 12 months after the end of treatment.

⁃ Subjects voluntarily participate in this study, sign the informed consent form, have good compliance, and cooperate with follow-up; Patients whom doctors believe can benefit from the treatment.