There have been significant improvements in the survival of patients with metastatic colorectal cancer (mCRC) over the past decade. However, patients with the disease who fail to respond to first- or second-line therapies, including chemotherapy and monoclonal antibodies, have few treatment options. Advances in subsequent treatment lines rather than in first- or second-line therapies now drive improvements in survival for these patients.
PD-L1 expression is a rational biomarker to predict response to PD-1/PD-L1 ICI therapy, and has been studied extensively in clinical trials. A recurring theme emerging from available clinical data is that high levels of tumor cell membrane PD-L1 expression correlate with better outcomes with PD-1/PD-L1 blockade.
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