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.
Log-rank tests of cause specific comparing those who had ≥15, 7-14, and ≤6 positive lymph nodes for A. all stage: χ2 = 491.935, P < 0.001; B. N1 stage: χ2 = 305.678, P < 0.001; C. N2 stage: χ2 = 200.635, P < 0.001; D. N3 stage: χ2 = 29.113, P < 0.001.
