Narod SA. Tamoxifen ChemopreventionâEnd of the Road?. JAMA Oncol. 2015;1(8):1033â1034. doi:10.1001/jamaoncol.2015.2247. Download citation file:
About Rare Diseases. A rare disease is defined by the European Union as one that affects less than 5 in 10,000 of the general population. There are between 6,000 and 8,000 known rare diseases. Around five new rare diseases are described in medical literature each week.
According to the National Institutes of Health (NIH), a disease is considered rare if it has a prevalence of fewer than 200,000 affected individuals in the United States. There are roughly 7,000 rare diseases currently identified. View the full list from NIH. Get the facts.