This study compares two short pre-surgery treatments for locally advanced head and neck squamous cell cancer to see which one keeps the cancer from coming back longer.

Eligible patients (18-70 years, newly diagnosed, operable) will be randomly assigned to receive either toripalimab (immunotherapy) alone or toripalimab plus two cycles of chemotherapy (docetaxel and cisplatin). After the two cycles, all patients will have standard surgery followed by radiation (or chemo-radiation).

We will track tumor response, side effects, and quality of life. Possible benefits: tumor shrinkage and lower chance of recurrence; possible risks: low blood counts, rash, tiredness, or other drug-related side effects.

Taking part is voluntary and you can leave the study at any time.

Inclusion Criteria:

• Pathologically confirmed, newly diagnosed, non-metastatic, operable locally advanced head-and-neck squamous cell carcinoma (oral cavity, larynx, hypopharynx, or oropharynx) Stage III-IVA (p16-positive oropharynx T4N0-N2; p16-negative oropharynx III-IVA; larynx/hypopharynx/oral cavity III-IVA) PD-L1 CPS ≥ 1 Age 18-70 years ECOG performance status 0-1 Adequate organ function (ANC ≥ 2.0×10⁹/L, platelets ≥ 100×10⁹/L, TBIL < 1.5×ULN, ALT/AST < 1.5×ULN, creatinine < 1.5×ULN) No prior head-and-neck cancer surgery or radiotherapy No other malignancy within 5 years Signed informed consent

Exclusion Criteria:

• Previous systemic anti-cancer therapy for head-and-neck cancer Known hypersensitivity to study drugs Active or untreated hepatitis B/C, HIV positivity Severe cardiac, pulmonary, liver, or renal insufficiency precluding surgery Pregnancy or lactation Psychiatric or social conditions preventing compliance Organ transplant on chronic immunosuppression