Prevalence and Incidence of Hairy cell leukemia
Hairy cell leukemia: Rare Disease
Hairy cell leukemia is listed as a "rare disease" by the Office of
Rare Diseases (ORD) of the National Institutes of Health
(NIH). This means that Hairy cell leukemia, or a subtype of Hairy cell leukemia,
affects less than 200,000 people in the US population.
Ophanet, who are a consortium of European partners,
currently defines a condition rare when if affects 1 person per 2,000.
They list Hairy cell leukemia as a "rare disease".
More information about Hairy cell leukemia is available from Orphanet
About prevalence and incidence statistics:
The term 'prevalence' of Hairy cell leukemia usually refers to the estimated population
of people who are managing Hairy cell leukemia at any given time.
The term 'incidence' of Hairy cell leukemia refers to the annual diagnosis rate,
or the number of new cases of Hairy cell leukemia diagnosed each year.
Hence, these two statistics types can differ:
a short-lived disease like flu can have high annual incidence but low prevalence,
but a life-long disease like diabetes has a low annual incidence but high prevalence.
For more information see about prevalence and incidence statistics.