Study: NCT04202601

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: Sintilimab
Description: Arms 1: Neoadjuvant therapy group 20 patients Drug: Sintilimab Weight\<60Kg: 3mg/kg Q3W Weight\>=60Kg:200 mg Q3W on Day 1 by IV infusion; Intervention：Perioperative Sintilimab+IBI310 are administered for 1-3 (6-18 weeks) cycles followed by 4 postoperative cycles (12 weeks) with Sintilimab monotherapy .~Arms 2: first-line therapy group, 30 patients Drug: Sintilimab Weight\<60Kg: 3mg/kg Q3W Weight\>=60Kg:200 mg Q3W on Day 1 by IV infusion; Intervention：Sintilimab + IBI310 are administered for 1-3 (6-18 weeks) cycles followed by Sintilimab monotherapy for up to 2 years.~Arms 3: ≥second-line therapy group, 30 patients Drug: Sintilimab Weight\<60Kg: 3mg/kg Q3W Weight\>=60Kg:200 mg Q3W on Day 1 by IV infusion; Intervention：Sintilimab + IBI310 are administered for 1-3 (6-18 weeks) cycles followed by Sintilimab monotherapy for up to 2 years.

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: Sintilimab
Description: Arms 1: Neoadjuvant therapy group 20 patients Drug: Sintilimab Weight\<60Kg: 3mg/kg Q3W Weight\>=60Kg:200 mg Q3W on Day 1 by IV infusion; Intervention：Perioperative Sintilimab+IBI310 are administered for 1-3 (6-18 weeks) cycles followed by 4 postoperative cycles (12 weeks) with Sintilimab monotherapy .~Arms 2: first-line therapy group, 30 patients Drug: Sintilimab Weight\<60Kg: 3mg/kg Q3W Weight\>=60Kg:200 mg Q3W on Day 1 by IV infusion; Intervention：Sintilimab + IBI310 are administered for 1-3 (6-18 weeks) cycles followed by Sintilimab monotherapy for up to 2 years.~Arms 3: ≥second-line therapy group, 30 patients Drug: Sintilimab Weight\<60Kg: 3mg/kg Q3W Weight\>=60Kg:200 mg Q3W on Day 1 by IV infusion; Intervention：Sintilimab + IBI310 are administered for 1-3 (6-18 weeks) cycles followed by Sintilimab monotherapy for up to 2 years.

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: Sintilimab
Description: Arms 1: Neoadjuvant therapy group 20 patients Drug: Sintilimab Weight\<60Kg: 3mg/kg Q3W Weight\>=60Kg:200 mg Q3W on Day 1 by IV infusion; Intervention：Perioperative Sintilimab+IBI310 are administered for 1-3 (6-18 weeks) cycles followed by 4 postoperative cycles (12 weeks) with Sintilimab monotherapy .~Arms 2: first-line therapy group, 30 patients Drug: Sintilimab Weight\<60Kg: 3mg/kg Q3W Weight\>=60Kg:200 mg Q3W on Day 1 by IV infusion; Intervention：Sintilimab + IBI310 are administered for 1-3 (6-18 weeks) cycles followed by Sintilimab monotherapy for up to 2 years.~Arms 3: ≥second-line therapy group, 30 patients Drug: Sintilimab Weight\<60Kg: 3mg/kg Q3W Weight\>=60Kg:200 mg Q3W on Day 1 by IV infusion; Intervention：Sintilimab + IBI310 are administered for 1-3 (6-18 weeks) cycles followed by Sintilimab monotherapy for up to 2 years.

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: IBI310
Description: Arms 1: Neoadjuvant therapy group, 20 patients Drug: IBI310 1 mg/kg Q6W on Day 1 by IV infusion. Intervention：Perioperative Sintilimab+ IBI310 are administered for 1-3 (6-18 weeks) cycles followed by 4 postoperative cycles (12 weeks) with Sintilimab monotherapy .~Arms 2: first-line therapy group, 30 patients Drug: IBI310 1 mg/kg Q6W on Day 1 by IV infusion. Intervention：Sintilimab + IBI310 are administered for 1-3 (6-18 weeks) cycles followed by Sintilimab monotherapy for up to 2 years.~Arms 3: ≥second-line therapy group, 30 patients Drug: IBI310 1 mg/kg Q6W on Day 1 by IV infusion. Intervention：Sintilimab + IBI310 are administered for 1-3 (6-18 weeks) cycles followed by Sintilimab monotherapy for up to 2 years.

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: IBI310
Description: Arms 1: Neoadjuvant therapy group, 20 patients Drug: IBI310 1 mg/kg Q6W on Day 1 by IV infusion. Intervention：Perioperative Sintilimab+ IBI310 are administered for 1-3 (6-18 weeks) cycles followed by 4 postoperative cycles (12 weeks) with Sintilimab monotherapy .~Arms 2: first-line therapy group, 30 patients Drug: IBI310 1 mg/kg Q6W on Day 1 by IV infusion. Intervention：Sintilimab + IBI310 are administered for 1-3 (6-18 weeks) cycles followed by Sintilimab monotherapy for up to 2 years.~Arms 3: ≥second-line therapy group, 30 patients Drug: IBI310 1 mg/kg Q6W on Day 1 by IV infusion. Intervention：Sintilimab + IBI310 are administered for 1-3 (6-18 weeks) cycles followed by Sintilimab monotherapy for up to 2 years.

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: IBI310
Description: Arms 1: Neoadjuvant therapy group, 20 patients Drug: IBI310 1 mg/kg Q6W on Day 1 by IV infusion. Intervention：Perioperative Sintilimab+ IBI310 are administered for 1-3 (6-18 weeks) cycles followed by 4 postoperative cycles (12 weeks) with Sintilimab monotherapy .~Arms 2: first-line therapy group, 30 patients Drug: IBI310 1 mg/kg Q6W on Day 1 by IV infusion. Intervention：Sintilimab + IBI310 are administered for 1-3 (6-18 weeks) cycles followed by Sintilimab monotherapy for up to 2 years.~Arms 3: ≥second-line therapy group, 30 patients Drug: IBI310 1 mg/kg Q6W on Day 1 by IV infusion. Intervention：Sintilimab + IBI310 are administered for 1-3 (6-18 weeks) cycles followed by Sintilimab monotherapy for up to 2 years.