Journal
INTERNATIONAL JOURNAL OF EPIDEMIOLOGY
Volume 42, Issue 6, Pages 1852-1861Publisher
OXFORD UNIV PRESS
DOI: 10.1093/ije/dyt196
Keywords
Breast cancer survival; beta-blockers; pharmacoepidemiology; medication; propranolol; targeted therapy
Categories
Funding
- Cancer Research-UK [C19630/A13265]
- Fritz Bender Foundation (Munich, Germany)
- MRC [MR/K023241/1] Funding Source: UKRI
- Medical Research Council [MR/K023241/1] Funding Source: researchfish
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Background To investigate the association between post-diagnostic beta-blocker usage and risk of cancer-specific mortality in a large population-based cohort of female breast cancer patients. Methods A nested case-control study was conducted within a cohort of breast cancer patients identified from cancer registries in England (using the National Cancer Data repository) and diagnosed between 1998 and 2007. Patients who had a breast cancer-specific death (ascertained from Office of National Statistics death registration data) were each matched to four alive controls by year and age at diagnosis. Prescription data for these patients were available through the Clinical Practice Research Datalink. Conditional logistic regression models were used to investigate the association between breast cancer-specific death and beta-blocker usage. Results Post-diagnostic use of beta-blockers was identified in 18.9% of 1435 breast cancer-specific deaths and 19.4% of their 5697 matched controls, indicating little evidence of association between beta-blocker use and breast cancer-specific mortality [odds ratio (OR) = 0.97, 95% confidence interval (CI) 0.83, 1.13]. There was also little evidence of an association when analyses were restricted to cardio non-selective beta-blockers (OR = 0.90, 95% CI 0.69, 1.17). Similar results were observed in analyses of drug dosage frequency and duration, and beta-blocker type. Conclusions In this large UK population-based cohort of breast cancer patients, there was little evidence of an association between post-diagnostic beta-blocker usage and breast cancer progression. Further studies which include information on tumour receptor status are warranted to determine whether response to beta-blockers varies by tumour subtypes.
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