With clear evidence of activity for immune checkpoint inhibitors across the spectrum of solid tumour malignancies, identifying combination therapies to augment their efficacy is a high research priority. In gastro-oesophageal cancer, immune checkpoint inhibitors initially received approval for chemotherapy-refractory gastric cancer,1 then approval for second-line therapy in oesophageal squamous cancer,2,3 and more recently approval in combination with first-line chemotherapy in oesophagogastric cancer.