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Logistic regression model ROC. The correlation between the binary clinical outcome (SD/PR/CR vs. PD) and the change in PD-L1 expression on CTCs was analyzed using a logistic regression adjusting for baseline PD-L1 expression. ROC, receiver operating characteristic; SD, stable disease; PR, partial response; CR, complete response; PD, progressive disease; PD-L1, programmed death-ligand-1; CTC, circulating tumor cell.
