Table 1.

Prevalence of PD-L1, MSI, and EBV expression

Biomarker	Total patients tested, N	Status	Patients, n (%)	95% CIa
PD-L1 expressionb	389	Positive	241 (62.0)	56.9, 66.8
MSI statusc	379	MSI-H	24 (6.3)	4.1, 9.3
EBV status	389	Positive	13 (3.3)	1.8, 5.6

^aClopper-Pearson method

^bPD-L1 expression is positive when the CPS is ≥1 and negative when the CPS is <1

^cProportion of patients, including reference values

CI, confidence interval; CPS, combined positive score; EBV, Epstein-Barr virus; MSI-H, microsatellite instability-high; PD-L1, programmed death ligand-1