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.
Age distribution for patients enrolled onto National Cancer Institute (NCI) adult cooperative group phase II and III treatment trials (all diseases) from 2001 to 2011. Percentage of patients enrolled in each age group is shown for each year, as reported by cooperative groups to the NCI Clinical Data Update System database (NCI Division of Cancer Treatment and Diagnosis) as of May 2012.
