Unlocking the Hidden Links: Similarities Among Rare Diseases?
The criteria for what constitutes a rare disease differs from one country to another. For instance, the FDA Orphan Drug Act defines a rare disease as one that affects fewer than 200,000 people in the United States1. In the European Union, a rare disease is defined as one that affects no more than one person in 2,0002. Japan’s legal definition considers a disease rare if it affects fewer than 50,000 or about 1 in 2,500 people3. Given the lack of a universal definition, it raises the question: Could there be any similarities among rare diseases?
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