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Meta-Analysis of Association Between Mediastinal Radiotherapy and Long-Term Heart Failure

Citation

Nolan, MT and Russell, DJ and Negishi, K and Marwick, TH, Meta-Analysis of Association Between Mediastinal Radiotherapy and Long-Term Heart Failure, The American Journal of Cardiology, 118, (11) pp. 1685-1691. ISSN 0002-9149 (2016) [Refereed Article]

Copyright Statement

Crown Copyright 2016

DOI: doi:10.1016/j.amjcard.2016.08.050

Abstract

This investigation sought to identify and quantify any increased risk of long-term heart failure (HF) after thoracic radiotherapy (RT) for cancer and identify any population covariates that corresponded with increased risk. Electronic databases were systematically searched for studies reporting relative risk, odds ratio, and hazard ratio (HR) for symptomatic HF more than 5 years after RT administration. Clinical characteristics, study design, univariable effect sizes, and associated 95% CIs were extracted. Univariable effect size was pooled and computed in a meta-analysis using random-effects model weighted by inverse variance. Six studies (45,669 patients) with weighted median follow-up duration of 13.9 years were included, each data-linkage study that reported HRs for HF. Pooled HR for long-term HF was significant (HR 1.83 [1.09 to 3.08], p = 0.022), with significant between-study heterogeneity (Q 43.38, df = 5, p <0.001, I2 88.47%). Statistical significance was lost when excluding studies of malignancies other than breast cancer or hematological malignancies and excluding studies with Newcastle-Ottawa scores <8, but the direction of effect and magnitude remained approximately the same. Subgroup and meta-regression analyses demonstrated that study differences in age at time of RT administration and duration of follow-up explained approximately 80% of observed heterogeneity. Earlier publication date was associated with increased HF risk. Other variables, including female proportion, proportion of adjuvant chemotherapy use, and sample size did not significantly impact the conclusions. In conclusion, RT approximately doubled the long-term risk of HF. This finding was associated with younger age at time of RT and longer follow-up duration, which explained approximately 80% of interstudy heterogeneity.

Item Details

Item Type:Refereed Article
Research Division:Medical and Health Sciences
Research Group:Cardiorespiratory Medicine and Haematology
Research Field:Cardiology (incl. Cardiovascular Diseases)
Objective Division:Health
Objective Group:Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:Cardiovascular System and Diseases
Author:Nolan, MT (Mr Mark Nolan)
Author:Negishi, K (Dr Kazuaki Negishi)
Author:Marwick, TH (Professor Tom Marwick)
ID Code:112574
Year Published:2016
Web of Science® Times Cited:1
Deposited By:Menzies Institute for Medical Research
Deposited On:2016-11-16
Last Modified:2017-11-03
Downloads:0

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