Fig. 4From: Prognostic significance of blood-based PD-L1 analysis in patients with non-small cell lung cancer undergoing immune checkpoint inhibitor therapy: a systematic review and meta-analysisForest plots of PD-L1 expression on CTCs and OS/PFS in patients undergoing ICI therapy. a–b: PD-L1 expression in CTCs versus OS/PFS; Guibert (2018a) represented the data with a cut-off value of 1%; Guibert (2018b) represented the data with a cut-off value of 5%; Guibert (2018c) represented the data with a cut-off value of 10%Back to article page