This study is a prospective,open-label,single-arm clinical trial to evaluate the efficacy and safety of s Surufatinib combined with envolizumab as second-line treatment of recurrent/metastatic head and neck squamous cell carcinoma . envolizumab: 300 mg subcutaneously every 3 weeks (Q3W); Surufatinib : 200 mg orally within 1 hour after breakfast, once daily continuously every 3 weeks as a treatment cycle until intolerable toxicity or disease progression. If any ≥ Grade 2 treatment-related adverse event occurs during treatment, the dose may be adjusted to 100 mg according to the investigator 's
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