Study design and patients
NIVO
CheckMate 648 is an open-label, phase 3 trial to assess nivolumab-plus-ipilimumab (NIVO + IPI) and nivolumab-plus-chemotherapy (NIVO + Chemo) combinations compared with chemotherapy alone (Chemo) as a first-line treatment in patients with advanced ESCC. Detailed methods are published elsewhere [