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.
Definitions of terminology used in the current study
| Term | Definition |
|---|---|
| Drugs for rare diseases (DRDs) | Drugs used to treat diseases that affect ≤ 50 per 100,000 people. |
| Drugs for ultra-rare diseases (DURDs) | Drugs used to treat diseases that affect ≤ 1 per 100,000 people. - |
| Drugs for other rare diseases (DORDs) | Drugs used to treat rare diseases that affect > 1 to 50 per 100,000 people. |
