Ladislaus Bortkiewicz Said

Defining 'rare'

As most Americans were preparing their flags and barbecues for the celebration of their nation's birth, a few were still recovering from some unwelcome news. On July 1st, sufferers from rare, unclassifiable diseases learned that the US National Institute of Health's Undiagnosed Diseases Program (UDP) would be indefinitely closing its doors to new patients . Established in 2008, the UDP is the joint effort of the National Human Genome Research Institute (NHGRI) and NIH's Office of Rare Diseases (ORD) to solve the most puzzling of medical mysteries, cases which "truly confound medical experts".Despite a productive three-year term, as of February this year, had received more than 1,700 candidates, 330 cases treated, made 1 million SNP scan network, and discovered a new disease, the UDP was unable to follow the pace with the volume of new investigations. Faced with a growing backlog of candidates, beginning this month, the Program Council decided to put a temporary freeze on new enrollments to the processing of their current files is complete.

Perhaps no group was more shocked by the flood of patients using the same UDP that specialists in the team treatment program.Having chosen the specialty of rare diseases, these clinicians may be expected that burnout would be the last of their worries. The irony of the situation begs the question: is an UDP flood a sign of lack of staff or the program to reassess its concept of rare?

Browse the pages of the website Ord, there is a "rare disease" to be defined as a condition that "affects less than 200,000 Americans."Dividing this number by the number of the current census of U.S. young and old makes the DSB is rare, which states that an event is rare, if, after numerous independent tests, the total number of instances of the event follows the Poisson distribution.

The law was popularized in a 1898 Ladislaus von Bortkiewicz brochure that have applied to the analysis of a variety of terrible events: the number of child suicides, fatal accidents, and, most famously, the number of Prussian cavalry killed by the firing of a horse.Whether the Poisson distribution can provide a good fit as the number of undiagnosed disease in the United States is hard to say. Even if one could draw a random sample of patients diagnosed with pools scattered throughout the States, there would still be the problem of identifying a disease ultimately unknown. Unlike the kick of a horse, a diagnosed disease can not be observed, it can be inferred from all classifications of known diseases were excluded - a task akin to prove a null hypothesis.

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