Familial chronic myeloproliferative disorders: the state of the art

Hematological Oncology
Elisa Rumi


Familial chronic myeloproliferative disorders are defined when in the same pedigree at least two relatives have a chronic myeloproliferative disorder (CMD) as polycythemia vera (PV), essential thrombocythemia (ET) or primary myelofibrosis (PMF). This condition should be distinguished from inherited disorders with Mendelian transmission and single haematopoietic lineage proliferation, named hereditary erythrocytosis and thrombocytosis. The recently discovered mutations in patients with CMD (V617F and exon 12 of JAK2 gene, MPL gene), and those identified in hereditary erythrocytosis and in hereditary thrombocytosis have improved our ability to discriminate these conditions. In familial CMD, the JAK2 mutations are acquired and occur as secondary genetic events. As both mutations of the JAK2 gene have been reported in the same pedigree, a genetic predisposition to the acquisition of the JAK2 mutations is supposed to be inherited. The prevalence of familial cases within CMD is at least 7.6%. The inheritance pattern of familial CMD is consistent with an autosomal dominant trait with decreased penetrance. The clinical presentation at diagnosis of patients with familial CMD does not differ from that of patients with sporadic CMD. In ad...Continue Reading


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