concepts
type: Collection
type: ConceptGroup
member: orphan drugs

drugs
type: Concept
narrower: orphan drugs

orphan drugs
type: Concept
broader: pharmaceuticals and clinical trials
broader: drugs
definition: Orphan drugs are products that treat rare diseases affecting fewer than 200,000 Americans. There are approximately 4000 orphan diseases in the United States. [Source: Encyclopedia of Health Care Management; Orphan Drug]

pharmaceuticals and clinical trials
type: Concept
narrower: orphan drugs