Vascular Diseases In Patients With Chronic Myeloproliferative Neoplasms – Impact Of Comorbidity
Received 23 May 2019
Accepted for publication 1 October 2019
Published 1 November 2019 Volume 2019:11 Pages 955—967
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 5
Editor who approved publication: Dr Eyal Cohen
Henrik Frederiksen,1–3 Szimonetta Szépligeti,1 Marie Bak,4 Waleed Ghanima,5,6 Hans Carl Hasselbalch,4 Christian Fynbo Christiansen1
1Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark; 2Department of Haematology, Odense University Hospital, Odense, Denmark; 3Department of Clinical Research, University of Southern Denmark, Odense, Denmark; 4Department of Haematology, Zealand University Hospital, Roskilde, Denmark; 5Departments of Oncology, Medicine and Research, Østfold Hospital Trust, Kalnes, Norway; 6Department of Haematology, Institute of Clinical Medicine, University of Oslo, Oslo, Norway
Correspondence: Henrik Frederiksen
Department of Haematology, Odense University Hospital, Kloevervaenget 6, Entrance 93, 12th Floor, Odense C DK-5000, Denmark
Background: Patients with chronic myeloproliferative neoplasms (MPNs), including essential thrombocythemia (ET), polycythemia vera (PV), and primary myelofibrosis (PMF), are at high risk of vascular complications. However, the magnitude of this is risk not well known and the possible effect of comorbidity is poorly understood.
Aim: Our aim was to compare the risk of vascular diseases in patients with MPNs and matched comparisons from the general population and to study the effect modification of comorbidity.
Methods: We followed 3087 patients with ET, 6076 with PV, 3719 with PMF or unspecified MPN, and age- and sex-matched general population comparisons to estimate the risks of cardiovascular diseases such as myocardial infarction and stroke. We computed 5-year cumulative incidences (risks) for vascular disease in patients with MPNs and comparisons as well as 1-year and 5-year risks, risk differences, and hazard ratios (HRs) for vascular diseases comparing rates in each group of patients with their comparison cohort by level of comorbidity based on the Charlson Comorbidity Index (CCI) [score of 0 (low comorbidity), of 1–2 (moderate comorbidity), and of >2 (severe comorbidity)], as well as other comorbid conditions.
Results: The overall 5-year risk of vascular disease ranged from 0.5% to 7.7% in patients with MPNs, which was higher than the risk in the general population. In the same period, the adjusted HRs for vascular disease were 1.3 to 3.7 folds higher in patients with MPNs compared to the general population. An increase in CCI score was associated with an equally increased rate of most types of vascular diseases during the first 5 years of follow-up in both MPN and comparisons.
Conclusion: Patients with MPNs have a higher risk of vascular diseases during the first 5 years than that of the general population; however, comorbidity modifies the rates similarly in MPN and in the general population.
Keywords: myeloproliferative neoplasms, thrombosis, comorbidity, stroke, epidemiology
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