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.
(A) T stage, (B) N stage, (C) M stage, (D) Clinical stage, (E) CEA levels before treatment. T, topography distribution; N, lymph node metastasis; M, distant metastasis.
