{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T23:13:50Z","timestamp":1792192430411,"version":"4.4.0"},"reference-count":63,"publisher":"American Medical Association (AMA)","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JAMA"],"published-print":{"date-parts":[[2025,1,14]]},"abstract":"<jats:sec id=\"ab-jrv240027-1\"><jats:title>Importance<\/jats:title><jats:p>Polycythemia vera (PV), a myeloproliferative neoplasm characterized by an increased red blood cell mass and increased risk of thrombosis, affects approximately 65\u202f000 people in the US, with an annual incidence of 0.5 to 4.0 cases per 100\u202f000 persons.<\/jats:p><\/jats:sec><jats:sec id=\"ab-jrv240027-2\"><jats:title>Observations<\/jats:title><jats:p>Erythrocytosis (hemoglobin &amp;amp;gt;16.5 mg\/dL in men or &amp;amp;gt;16.0 mg\/dL in women) is a required diagnostic criterion, although thrombocytosis (53%) and leukocytosis (49%) are common. Patients may have pruritus (33%), erythromelalgia (5.3%), transient visual changes (14%), and splenomegaly (36%) with abdominal discomfort. More than 95% of patients have a <jats:italic>JAK2<\/jats:italic> gene variant, which helps distinguish PV from secondary causes of erythrocytosis, such as tobacco smoking or sleep apnea. Among 7 cohorts (1545 individuals), the median survival from diagnosis was 14.1 to 27.6 years. Prior to or at the time of PV diagnosis, arterial thrombosis occurred in 16% of patients and 7% had venous thrombotic events, which could involve unusual sites, such as splanchnic veins. PV is also associated with an increased bleeding risk, especially in patients with acquired von Willebrand disease, which can occur with extreme thrombocytosis (platelet count, \u22651000\u2009\u00d7\u200910<jats:sup>9<\/jats:sup>\/L). All patients with PV should receive therapeutic phlebotomy (goal hematocrit, &amp;amp;lt;45%) and low-dose aspirin (if no contraindications). Patients who are at higher risk of thrombosis include those aged 60 years or older or with a prior thrombosis. These patients and those with persistent PV symptoms may benefit from cytoreductive therapy with hydroxyurea or interferon to lower thrombosis risk and decrease symptoms. Ruxolitinib is a Janus kinase inhibitor that can alleviate pruritus and decrease splenomegaly in patients who are intolerant of or resistant to hydroxyurea. About 12.7% of patients with PV develop myelofibrosis and 6.8% develop acute myeloid leukemia.<\/jats:p><\/jats:sec><jats:sec id=\"ab-jrv240027-3\"><jats:title>Conclusions and Relevance<\/jats:title><jats:p>PV is a myeloproliferative neoplasm characterized by erythrocytosis and is almost universally associated with a <jats:italic>JAK2<\/jats:italic> gene variant. PV is associated with an increased risk of arterial and venous thrombosis, hemorrhage, myelofibrosis, and acute myeloid leukemia. To decrease the risk of thrombosis, all patients with PV should be treated with aspirin and therapeutic phlebotomy to maintain a hematocrit of less than 45%. Cytoreductive therapies, such as hydroxyurea or interferon, are recommended for patients at high risk of thrombosis.<\/jats:p><\/jats:sec>","DOI":"10.1001\/jama.2024.20377","type":"journal-article","created":{"date-parts":[[2024,11,18]],"date-time":"2024-11-18T16:32:35Z","timestamp":1731947555000},"page":"153","source":"Crossref","is-referenced-by-count":53,"title":["Diagnosis and Treatment of Polycythemia Vera"],"prefix":"10.1001","volume":"333","author":[{"given":"Douglas","family":"Tremblay","sequence":"first","affiliation":[{"name":"Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, New York"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marina","family":"Kremyanskaya","sequence":"additional","affiliation":[{"name":"Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, New 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