PDT For Induction Therapy For Head And Neck Cancer

This research study is being done to assess the safety and tolerability of toripalimab in combination with cisplatin and docetaxel (PDT) induction therapy for patients with CPS-positive locally advanced head and neck squamous cell carcinoma (HNSCC).

Inclusion Criteria: * Participants must have a new diagnosis of histologically or cytologically confirmed squamous cell carcinoma (SCC) of the oral cavity, oropharynx, hypopharynx, larynx, nasopharynx, sinonasal cavities or unknown primary HNSCC. * Participants with HPV-independent SCC or HNSCC or other head and neck subsites must have stage III or non-metastatic stage IV at the time of diagnosis. Participants with HPV-associated oropharynx SCC must have stage II or stage III disease. * Participants must be determined by the investigator to be candidates for induction systemic therapy due to reasons such as the extent of primary tumor at the time of diagnosis, rate of progression, symptom burden or potential benefit of cytoreduction prior to definitive local therapy. * Age ≥18 years. Because no dosing or adverse event data are currently available on the use of toripalimab in combination with cisplatin and docetaxel in participants \