Table 1. Prevalence of PD-L1 expression in patients with BC

PD-L1 expressiona28-8 and 22C3b22C3cSP142
% TC, n (%)CPS, n (%)% IC, n (%)
(N = 608)(N = 609)(N = 1080)
<1(%)390 (64)253 (42)367 (34)
≥1(%)218 (36)356 (58)713 (66)
  • All patients had a single test result or ≥ 2 identical results. aThe CPS algorithm is reported on a scale of 0-100, not as a percentage; bSamples tested with the 22C3 assay between Q4 2015 and Q4 2018 were scored using the % TC algorithm; cSamples tested with the 22C3 assay between Q1 2019 and Q4 2019 were scored using the CPS algorithm.