events or deaths (EFS)

mEC - (neo)adjuvant (NA) metastatic/advanced - esophageal cancer (mEC) mEC - (neo)adjuvant (NA)

versus placebo
nivolumab alone vs. placebo 1 0.63 [0.46; 0.86], 1 RCT, I2=0% conclusive
unassessable degree of certainty