Mean age at onset 57-60 years [MISCELLANEOUS] Children rarely develop the disorder [MISCELLANEOUS] Familial cases are rare and show incomplete penetrance [MISCELLANEOUS] Caused by somatic mutation in the janus kinase 2 gene (JAK2, 147796) [MOLECULAR BASIS] Distinct disorder from familial erythrocytosis (ECYT1, 133100) [MISCELLANEOUS]
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