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.
Patient with PD-L1-negative lung squamous cell carcinoma benefiting from Pembrolizumab treatment. a Blood samples collection time point. b–d Before treatment, bronchoscopy results of left common branch; left common branch end; left upper lobe (fluorescence). e Before treatment, CT examination results. f After more than one month of treatment, CT examination results. g After two and a half months of treatment, CT examination results
