Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Forest plot showing the association between programmed death ligand-1 (PD-L1) expression status with overall survival (OS). (A) All 19 eligible studies (18 publications) for OS. (B) Subgrouped by hazard ratio (HR) provided way (multivariate analysis/survival curve). (C) Subgrouped by country (Asia/non-Asia). (D) 18 eligible studies (17 publications) for OS in esophageal squamous cell carcinoma (ESCC).
