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The Capital Region of Denmark - a part of Copenhagen University Hospital
E-pub ahead of print

Amiodarone treatment in atrial fibrillation and the risk of incident cancers: a nationwide observational study

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BACKGROUND: In observational studies, case reports, and animal studies, amiodarone has been associated with incident cancer.

OBJECTIVE: The purpose of this study was to examine whether a dose-response relationship between amiodarone use and the risk of cancer could be ascertained in a large nationwide study cohort.

METHODS: Using nationwide registers, we included all Danish patients with atrial fibrillation (AF) treated with amiodarone from 1996 to 2014. Exposure was defined both by categories and as a continuous variable of the cumulative defined daily doses (cDDDs) of amiodarone. The association between amiodarone cDDD and incident cancer, as well as organ-specific types of cancer (skin, liver, lung), were estimated using multivariable Cox regression models and reported as hazard ratio (HR) with 95% confidence interval (CI) and using cubic restricted spline plots.

RESULTS: We included 18,503 patients with median follow-up time of 8.1 years (interquartile range [IQR] 4.3-12.4). Median age was 70 years (IQR 63-77). A total of 2974 individuals developed cancer during follow-up. We found no association between increasing amiodarone exposure (cDDD 181-400 and cDDD >400) and the hazard of incident cancer (HR 0.95; 95% CI 0.87-1.04; and HR 1.01; 95% CI 0.92-1.10) with reference to patients with cDDD <181. Similar results were found when investigating specific cancer types (skin, liver, and lung) as well as cDDD as a continuous variable.

CONCLUSION: In a large nationwide cohort of AF patients treated with amiodarone, we found no evidence of a dose-response relationship between cumulative dose of amiodarone and incident cancer risk.

Original languageEnglish
JournalHeart Rhythm
ISSN1547-5271
DOIs
Publication statusE-pub ahead of print - 2020

Bibliographical note

Copyright © 2019 Heart Rhythm Society. Published by Elsevier Inc. All rights reserved.

ID: 58508351