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.
The size of each dot represents the number of patients receiving the corresponding intervention. The width of each line represents the number of corresponding comparison studies. CTLA-4 indicates T-cell lymphocyte antigen 4; and PD-L1, programmed cell death ligand 1.
