An official website of the United States government
Here's how you know
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.
Progression-free survival of NPC patients with and without LNN. (A) 1,665 patients at stage N1-3, (B) 1,162 patients at stage N1, (C) 353 patients at stage N2, (D) 150 patients at stage N3.