Familial polycythemia vera.

Area of Science:

• Hematology
• Genetics
• Oncology

Background:

• Polycythemia vera is a myeloproliferative neoplasm characterized by excessive red blood cell production.
• Familial occurrences of polycythemia vera suggest a potential genetic predisposition.

Purpose of the Study:

• To report a case of polycythemia vera in a four-member family.
• To review 13 kindreds with familial polycythemia vera involving 31 members.
• To compare clinical and laboratory findings of familial and non-familial polycythemia vera.

Main Methods:

• Retrospective review of comprehensive medical records for familial and non-familial cases.
• Analysis of clinical data including age at diagnosis, sex, symptoms, and splenomegaly.
• Evaluation of laboratory data such as red blood cell volume, leukocytosis, thrombocytosis, and leukocyte alkaline phosphatase levels.
• Assessment of chromosomal abnormalities.

Main Results:

• Familial polycythemia vera cases showed similarities to non-familial cases in age at diagnosis, sex distribution, symptoms, chromosomal abnormalities, leukocytosis, thrombocytosis, and elevated leukocyte alkaline phosphatase.
• Familial cases exhibited a higher mean red blood cell volume at diagnosis and a greater incidence of splenomegaly compared to non-familial cases.
• Thirteen kindreds comprising 31 members with familial polycythemia vera were identified.

Conclusions:

• While clinical and laboratory features are largely similar, familial polycythemia vera may present with increased red blood cell volume and splenomegaly.
• The exact mode of inheritance remains undetermined.
• Genetic factors are likely implicated in the pathogenesis of polycythemia vera, suggesting a hereditary component.