Oxaliplatin ± Nivolumab in Combination With Trifluridine/Tipiracil or 5-fluorouracile in Frail Patients With Advanced, Recurrent or Metastatic Gastric, Oesophageal or Gastroesophageal Junction Cancer

Trifluridine/Tipiracil will be administered with a 14-day schedule (35 mg/m² BID for 5 days followed by 9 days of recovery) until disease progression or intolerable toxicity.

Oxaliplatin will be administered intravenously on day 1 of each treatment cycle (infusion duration: 2 hours), every 2 weeks. The first cycle will be administered at level -1 (70 mg/m²) and then increased to 85 mg/m² (if feasible) from the cycle 2 to 8 or until disease progression, whatever occurs first. In case of limiting-oxaliplatin neuropathy and in all cases after 8 cycles, oxaliplatin will be stopped and Trifluridine/Tipiracil will be continued alone until disease progression or intolerable toxicity.

Folinic Acid 400 mg/m² (or 200 mg/m² if L-folinic acid) + oxaliplatin 85 mg/m² (infusion duration: 2 hours) followed by 5-FU bolus 400 mg/m² and then 5-FU 2400 mg/m² as a 46-hour continuous infusion. Treatment repeated every 14 days. In case of limiting-oxaliplatin neuropathy and in all cases after 8 cycles, oxaliplatin will be stopped and 5-FU (simplified LV5FU2 regimen) or capecitabine (1000 mg/m² BID during 2 weeks every 3 weeks) will be continued alone until disease progression or intolerable toxicity.

Nivolumab 240 mg (infusion duration 30 minutes, every 2 weeks) until disease progression or intolerable toxicity for a maximum of 2 years