• Histologically documented oral squamous cell carcinoma (biopsy required).

• Local advanced oral squamous cell carcinoma (clinical stage T1-2N1-2M0, T3-4aN0-2M0) with resection option for potential cure, as assessed by a faculty surgeon at Hospital of Stomatology, Wuhan University.

• Distant metastasis is excluded by chest CT and emission computed tomograph.

• Adequate organ function as follows: 1) Leukocyte count ≥ 2,000/mm3; 2) Absolute neutrophil count ≥ 1,000/mm3; 3) Platelet count ≥ 100,000/mm3; 4) Hemoglobin ≥ 90 g/L; 5) Serum albumin ≥30 g/L; 6) Total bilirubin ≤ 1.5 × upper limit of normal (ULN); 7) AST (SGOT) and ALT (SGPT) \< 2.5 × ULN; 8) ALP ≤ 2.5 × ULN; 9) Prothrombin time-international normalized ratio ≤ 1.5; 10) Serum creatinine ≤ 1.5 × ULN; 11) INR/PT≤ 1.5; 12) TSH ≤ ULN.

• ECOG performance status 0-1.

• Female patient tested HCG negative in serum or urine within 7 days prior to the start of investigational product. Both patient and partner must agree to use contraception prior to study entry and for the duration of study participation and for up to 120 days after the last dose of PD-1 blockade.

• Patient understands the study regimen, its requirements, risks and discomforts and is able and willing to sign the informed consent form.