National Organization for Rare Disorders, Inc.
It is possible that the main title of the report Polycythemia Vera is not the name you expected.
Polycythemia vera is a rare, chronic disorder involving the overproduction of blood cells in the bone marrow (myeloproliferation). The overproduction of red blood cells is most dramatic, but the production of white blood cells and platelets are also elevated in most cases. Since red blood cells are overproduced in the marrow, this leads to abnormally high numbers of circulating red blood cells (red blood mass) within the blood. Consequently, the blood thickens and increases in volume, a condition called hyperviscosity. Thickened blood may not flow through smaller blood vessels properly. A variety of symptoms can occur in individuals with polycythemia vera including nonspecific symptoms such as headaches, fatigue, weakness, dizziness or itchy skin; an enlarged spleen (splenomegaly); a variety of gastrointestinal issues; and the risk of blood clot formation, which may prevent blood flow to vital organs. More than 90 percent of individuals with polycythemia vera have a mutation of the JAK2 gene. The exact role that this mutation plays in the development of polycythemia vera is not yet known.
Polycythemia vera was first reported in the medical literature in 1892. The term "myeloproliferative disorder" (MPD) was first used to described polycythemia vera and related disorders in 1951. In 2008, the World Health Organization reclassified MPDs to "myeloproliferative neoplasms" (MPNs) to reflect the consensus that these diseases are blood cancers (neoplasms).
This group of disorders is characterized by the overproduction (proliferation) of one or more of the three main blood cell lines - red or white blood cells or platelets. Red blood cells carry oxygen to the body. White blood cells fight infection. Platelets are involved in clotting of the blood in response to injury. Three other disorders are commonly classified as MPNs: chronic myeloid leukemia, essential thrombocythemia and idiopathic myelofibrosis. Because MPNs are characterized by uncontrolled cell growth, they may also be classified as blood cancers.
Genetic and Rare Diseases (GARD) Information Center
- PO Box 8126
- Gaithersburg, MD 20898-8126
- Tel: (301)251-4925
- Fax: (301)251-4911
- Tel: (888)205-2311
- Website: http://rarediseases.info.nih.gov/GARD/
Leukemia & Lymphoma Society
- 1311 Mamaroneck Avenue
- Suite 310
- White Plains, NY 10605
- Tel: (914)949-5213
- Fax: (914)949-6691
- Tel: (800)955-4572
- Email: infocenter@LLS.org
- Website: http://www.LLS.org
MPN Research Foundation
- 180 N. Michigan Avenue, Suite 1870
- Chicago, IL 60601
- Tel: (312)683-7249
- Fax: (312)332-0840
- Email: mwoerhle@MPNResearchFoundation.org
- Website: http://www.mpnresearchfoundation.org
Myeloproliferative Disease Support and Daily Email Digest
- 2011 Flagler Ave.
- Key West, FL 33040
- Tel: (305)295-4444
- Email: email@example.com
- Website: http://www.mpdsupport.org/
NIH/National Heart, Lung and Blood Institute
- P.O. Box 30105
- Bethesda, MD 20892-0105
- Tel: (301)592-8573
- Fax: (301)251-1223
- Email: firstname.lastname@example.org
- Website: http://www.nhlbi.nih.gov/
National Cancer Institute
- 6116 Executive Blvd Suite 300
- Bethesda, MD 20892-8322
- Tel: (301)435-3848
- Tel: (800)422-6237
- Email: email@example.com
- Website: http://www.cancer.gov
Rare Cancer Alliance
- 1649 North Pacana Way
- Green Valley, AZ 85614
- Website: http://www.rare-cancer.org
For a Complete Report
This is an abstract of a report from the National Organization for Rare Disorders (NORD). For a full-text version of this report, go to www.rarediseases.org and click on Rare Disease Database under "Rare Disease Information".
The information provided in this report is not intended for diagnostic purposes. It is provided for informational purposes only.
It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report.
This disease entry is based upon medical information available through the date at the end of the topic. Since NORD's resources are limited, it is not possible to keep every entry in the Rare Disease Database completely current and accurate. Please check with the agencies listed in the Resources section for the most current information about this disorder.
Last Updated: 3/29/2016
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