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.
H&E and IHC staining of patients tumor tissue. Positive immunohistochemical staining for PD-L1 (a) and HER-2 (b) were tested in esophagocardial biopsy before neoadjuvant therapy. H&E staining were given after surgical resection for each patient after neoadjuvant therapy (c). Results are shown at × 400 magnification. IHC, immunohistochemical; PD-L1, programmed death ligand 1; HER2, human epidermal growth factor receptor 2
