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The relative survival (<jats:styled-content style=\"fixed-case\">RS<\/jats:styled-content>) was 72% and 46% at 10 and 20\u00a0years respectively, from the time of diagnosis. Multivariate analysis identified age &gt;70\u00a0years, white blood cell count &gt;13\u00a0\u00d7\u00a010<jats:sup>9<\/jats:sup>\/l and thrombo\u2010embolism at diagnosis as independent risk factors. Patients with two or three of these factors had a 10\u00a0year <jats:styled-content style=\"fixed-case\">RS<\/jats:styled-content> of 26%, compared with 59% and 84% in patients with one and no risk factors, respectively. Age and leucocyte count are the main predicting factors for survival in polycythaemia vera.<\/jats:p>","DOI":"10.1111\/bjh.12117","type":"journal-article","created":{"date-parts":[[2012,11,15]],"date-time":"2012-11-15T18:57:57Z","timestamp":1353005877000},"page":"251-254","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":67,"title":["Leucocytosis and thrombosis at diagnosis are associated with poor survival in polycythaemia vera: a population\u2010based study of 327 patients"],"prefix":"10.1111","volume":"160","author":[{"given":"Gilles","family":"Bonicelli","sequence":"first","affiliation":[{"name":"Service d'H\u00e9matologie Biologique CHU de Dijon Dijon France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Khadija","family":"Abdulkarim","sequence":"additional","affiliation":[{"name":"Haematology and Coagulation Section Department of Medicine Sahlgrenska University Hospital Gothenburg 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