Trial of Neoadjuvant Durvalumab Plus Docetaxel, Oxaliplatin, S-1 Followed by Surgery and Adjuvant Durvalumab Plus S-1 Chemotherapy in Potentially Resectable MMR Proficient Gastric or Gastroesophageal Junction Adenocarcinoma

"1. Neoadjuvant treatment Durvalumab 1120 mg IV on day (D) 1, Docetaxel 50 mg/m2 intravenously (IV) on D1, oxaliplatin 100 mg/m2 IV on D1, S-1 40 mg/m2 bid orally on D1-14, will be administered every three weeks for three cycles.~2. Surgery~3. Adjuvant treatment After 4-6 weeks from surgery, S-1 40 mg/m2 bid orally on D1-28 plus durvalumab 1120 mg on D1 and D22 will be administered every 6 weeks for 12 months as an adjuvant treatment."

"1. Neoadjuvant treatment Durvalumab 1500 mg IV and tremelimumab 75 mg IV on D1 will be administered every four weeks for three cycles.~2. Surgery~3. Adjuvant treatment After 4-6 weeks from surgery, durvalumab 1500 mg on D1 will be administered every 4 weeks for 12 months as an adjuvant treatment."