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.
Sample dendrogram of 54 human papillomavirus-negative head and neck squamous cell carcinoma tissues and the corresponding clinical characteristics of patients, including N stage, T stage, tumor grade, recurrence, perineural invasion, tobacco use history and alcohol consumption history. Red, white and grey indicate high, low and missing values, respectively. N, node; T, tumor.
