nivolumab based treatment
nivolumab plus SoC
mGC or mGEJC - 1st line (L1)
mGC or mGEJC - L1 - all population
mGC or mGEJC - L1 - HER2 neg/PDL1 positive 2    
mGC or mGEJC - L1 - HER2 negative 1   
mGC or mGEJC - L1 - HER2 positive
mGC or mGEJC - L1 - PDL1 positive 4
Comparator:  vs Standard of Care (SoC); 
Risk of bias:  low;   some concerns;   high;  NA;