Figure 3

Cases classified as positive or negative with the different PD-L1 assays 28-8, 22C3, SP263, and 28-8A (Abcam) using ≥1% (a) and ≥50% (b) positive tumor cells as cutoff for a positive test. Note that one of the 55 included cases was not evaluable with 28-8A (Abcam).