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Life expectancy ≥ 6 months.\n2. Subjects with histologically confirmed, resectable Stage III-IVA head and neck squamous cell carcinoma (HNSCC) eligible for curative-intent surgery.\n3. At least one extracranial measurable lesion per RECIST v1.1.\n4. Eastern Cooperative Oncology Group (ECOG) performance status 0-1.\n5. No severe cardiac dysfunction.\n6. Must provide tumor tissue sample not previously subjected to radiotherapy.\n7. Adequate organ function.\n8. Subjects of childbearing potential must use effective contraception during the study and for 180 days after the last dose.\n\nExclusion Criteria:\n\n1. Primary tumor originating from nasopharynx, nasal cavity, paranasal sinuses, salivary gland, thyroid\u002Fparathyroid gland, skin, or unknown primary site (squamous cell carcinoma).\n2. Head and neck cancer deemed non-resectable by the investigator.\n3. Prior treatment with anti-PD-1, anti-PD-L1, MMAE\u002FMMAF-based ADC agents, or other T-cell immune checkpoint inhibitors.\n4. Prior radiotherapy, systemic anti-tumor therapy, or other investigational therapy for head and neck cancer before study entry.\n5. Major surgery within 4 weeks before study entry, or not fully recovered from surgical toxicities\u002Fcomplications. Minor procedures (e.g., vascular access placement, percutaneous\u002Fendoscopic head\u002Fneck biopsy, tracheostomy tube exchange) are allowed.\n6. Grade ≥2 peripheral neuropathy (CTCAE v5.0).\n7. Active autoimmune disease requiring systemic treatment within 2 years before first dose.\n8. Receiving systemic glucocorticoid therapy or any other form of immunosuppressive therapy within 2 weeks before first dose.\n9. Radiologically detectable central nervous system metastases and\u002For carcinomatous meningitis.\n10. Uncontrolled pleural, peritoneal, pelvic effusion, or pericardial effusion.\n11. Any severe or uncontrolled systemic disease.\n12. Prior or planned allogeneic tissue\u002Fsolid organ transplantation.\n13. Known hypersensitivity to any active ingredient or excipient of the study drugs.\n14. Evidence of active infection including hepatitis B, hepatitis C, or human immunodeficiency virus (HIV).\n15. Anti-infective therapy within 2 weeks before randomization.\n16. Stroke or transient ischemic attack within 6 months before enrollment.\n17. Uncontrolled or poorly controlled cardiac disease.\n18. Deep or intraluminal bleeding requiring interventional\u002Fsurgical hemostasis or blood transfusion within 3 months, or current history of coagulopathy.\n19. Pulmonary embolism or deep vein thrombosis within 3 months.\n20. History of or current interstitial lung disease, severe chronic obstructive pulmonary disease, severe pulmonary insufficiency, bronchospasm, etc.\n21. Received live vaccine within 30 days before first study dose.\n22. History of other primary malignancy.\n23. Positive serum pregnancy test or breastfeeding female.\n24. Contraindications to study drugs (pucotenlimab and\u002For becotatug vedotin) or their excipients; severe hypersensitivity (Grade ≥3) to radiotherapy, cisplatin or its analogues.\n25. Any condition that the investigator considers unsuitable for participation in the trial.\n26. Grade ≥2 hearing impairment per CTCAE v6.0.","ALL","18 Years",{"count":235,"type":236},80,"ESTIMATED","INTERVENTIONAL",[239],"PHASE2","A multicenter, randomized, double-blind, phase II clinical study designed to evaluate the safety, pharmacokinetics, and preliminary efficacy of Becotatug Vedotin for Injection in combination with PD-1 in patients with locally advanced resectable head and neck squamous cell carcinoma",[242],"Head and Neck Squamous Cell Carcinoma",[244,245],"Pucotenlimab","Becotatug Vedotin","NOT_YET_RECRUITING","2026-05-07",{"date":249,"type":250},"2026-05-14","ACTUAL",{"date":252,"type":236},"2026-05",{"date":254,"type":236},"2028-12",{"name":5,"class":6},15]