Phase II Study of Avelumab Plus Chemotherapy in the Peri-operative Treatment for Patients With Resectable Gastric Cancer (GC) or Gastroesophageal Junction Cancer (GEJC)

Avelumab addition to perioperative chemotherapy in GC and GEJC. Peri-operatory treatment consisting of four cycles (each cycle is 14 days) of neoadjuvant chemotherapy (docetaxel, oxaliplatin and fluorouracil/leucovorin) plus avelumab previous to surgery. Surgery is recommended to be scheduled 4 to 6 weeks after the last dose. Afterwards (4 to 10 weeks after surgery), four cycles of adjuvant therapy with the same schema, followed by avelumab up to one year. There will be be a follow-up of 5 years.