Fig. 11

Funnel plot of publication bias assessment in progression-free survival (PFS) analysis for (A) age; (B) ethnicity; (C) ECOG status; (D) de novo metastasis; (E) bone metastasis; (F) lung metastasis; (G) liver metastasis; (H) distant metastasis; (I) number of metastasis; (J) prior use of chemotherapy; (K) prior use of taxane; (L) PD-L1 expression