Fig. 7From: Predictive value of pretreatment PD-L1 expression in EGFR-mutant non-small cell lung cancer: a meta-analysisBegg’s funnel plot and Egger’s funnel plot showed no publication bias among the included studies. a Begg’s funnel plot of PD-L1 expression and PFS (P = 0.929). b Egger’s funnel plot of PD-L1 expression and PFS (P = 0.174)Back to article page