pembrolizumab based treatment
pembrolizumab 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    
mGC or mGEJC - 2nd Line (L2)
mGC or mGEJC - L2 - all population 4
mGC or mGEJC - L2 - PDL1 positive 1
mGC or mGEJC - maintenance (M)
mGC or mGEJC - M - HER2 negative 1
mGC or mGEJC - M - HER2 neg/PDL1 positive 1
Comparator:  vs placebo plus SoC; 
Risk of bias:  low;   some concerns;   high;  NA;