NCI Dictionary of Cancer Terms

The NCI Dictionary of Cancer Terms features 8,360 terms related to cancer and medicine.

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orphan drug
(OR-fun …)
A drug used to treat, prevent, or diagnose an orphan disease. An orphan disease is a rare disease or condition that affects fewer than 200,000 people in the United States. Orphan diseases are often serious or life threatening. In 1983, the U.S. government passed a law, called the Orphan Drug Act, to give drug companies certain financial benefits for developing orphan drugs that are safe and effective.