1. Feasibility of four weeks of preoperative immunotherapy with Nivolumab, Nivolumab plus Relatlimab (80 mg), and Nivolumab plus Relatlimab (240 mg) (Time Frame - Within 43 days after first study medication)
Secondary outcome:
1. Estimation of pathological tumor response rate (Time Frame - Within 43 days after first study medication (day of surgery))
2. Estimation of curative (R0) resection rate (Time Frame - Within 43 days after first study medication (day of surgery))
3. Objective radiological response rate (Time Frame - After 3, 6, 9 and 12 months post-surgery): Objective radiological response rate per Response Evaluation Criteria In Solid Tumors (RECIST) version 1.1
4. Disease-free survival rate at 12 months (Time Frame - 12 months): Assessment of disease-free survival rate at 12 months per Response Evaluation Criteria In Solid Tumors (RECIST) version 1.1
Experimental: Nivolumab Nivolumab 2 cycles, every two weeks (q2w)
o Nivolumab 240 mg i.v. over 30 min
Experimental: Nivolumab/Relatlimab (80 mg) Nivolumab/Relatlimab (80 mg) 2 cycles, every two weeks (q2w)
Nivolumab 240 mg i.v. over 30 min
Relatlimab 80 mg i.v. over 30 min (within 30 min of nivolumab)
Experimental: Nivolumab/Relatlimab (240 mg) Nivolumab/Relatlimab (240 mg) 2 cycles, every two weeks (q2w)
Nivolumab 240 mg i.v. over 30 min
Relatlimab 240 mg i.v. over 30 min (within 30 min of nivolumab)