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.
PD-L1 staining by immunohistochemistry in anal cancer. Using a monoclonal antibody against the PD-L1 antibody, diffuse cell surface staining of PD-L1 (brown) is observed on the surfaces of tumor cells from a resected SCCA specimen. PD, programmed death; SCCA, squamous cell carcinoma of the anal canal.
