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.
Abbreviations: AE, adverse event; CI, confidence interval; PD‐1, programmed death receptor‐1; PD‐L1, programmed death‐ligand 1; RR, relative risk.
