<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A non-malignant disease that affects fewer than 200,000 people in the United States.</n0:def-definition><n0:def-source>NCI</n0:def-source><n0:attr>from National Organization for Rare Disorders</n0:attr></n0:ComplexDefinition>
nci:P98
There are more than 5,000 rare disorders that, taken together, affect approximately 20 million Americans. One in every 12 individuals in this country has received a diagnosis of a rare disease.