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.
Temporal Trends in Cardiovascular, Cancer, and Central Nervous System Drugs Entering Clinical Trials, 1990 to 2012
Temporal trends in cardiovascular (Anatomical Therapeutic Chemical [ATC] codes B and C; shown in blue), cancer (shown in green), and central nervous system (shown in red) trials as a proportion of trials for all products in Phase 1 (A), Phase 2 (B), and Phase 3 (C), 1990 to 2012. Ph. = phase.
