A post hoc analysis in advanced gastric cancer showed stronger association of programmed cell death-ligand 1 (PD-L1) with immunotherapy efficacy measured by combined positive score (CPS) compared with tumor cells (TC%). This finding suggests expression in immune cells in the tumor microenvironment increases the value of the companion diagnostic test.

See related article by Lei et al., p. 3926

©2021 American Association for Cancer Research
2021
American Association for Cancer Research
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