A Multicenter Open-label Phase II Trial to Evaluate Nivolumab and Ipilimumab for 2nd Line Therapy in Elderly Patients With Advanced Esophageal Squamous Cell Cancer

A Multicenter Open-label Phase II Trial to Evaluate Nivolumab and Ipilimumab for 2nd Line Therapy in Elderly Patients With Advanced Esophageal Squamous Cell Cancer