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Abstract
Background
Recent observational studies linked β-adrenergic receptor blocker use with improved survival in patients with several cancer types, but there is no information on the potential effects of β-blockers in patients with bladder cancer. Literature from pre-clinical studies is also limited, but urothelial cancer can exhibit significant overexpression of β-adrenergic receptors relative to normal urothelial tissue, suggesting that urothelial cancer may benefit from β-blockade therapy. We thus aimed to explore the possible association between β-blocker use and bladder cancer-specific mortality (BCSM) among patients with urothelial bladder cancer.
Material and methods
Patients diagnosed during 2006–2014 and identified from the Swedish Cancer Register (n = 16,669) were followed until 31 December 2015. Cox regression was used to evaluate the association of β-blockers dispensed within 90 days prior to cancer diagnosis with BCSM (primary outcome) and all-cause mortality, while controlling for socio-demographic factors, tumor characteristics, comorbidity, other medications and surgical procedures. Hazard ratios (HR) with 95% confidence intervals (CI) were reported.
Results
Overall, β-blocker use was associated with lower BCSM [HR 0.88 (95%CI 0.81–0.96)]. Especially use of nonselective β-blockers showed a clear inverse association in comparison with both nonuse [0.66 (0.50–0.86)] and use of other antihypertensive medications [0.72 (0.54–0.95)]. The inverse association was most pronounced among patients with locally advanced/metastatic disease: [0.35 (0.18–0.68)]. A lower-magnitude inverse association was observed for selective β-blocker use [0.91 (0.83–0.99)]. Largely similar inverse associations were observed for hydrophilic [0.82 (0.70–0.95)] and lipophilic [0.91 (0.83–1.00)] β-blocker use.
Conclusion
β-blocker use, particularly of the nonselective type, was associated with lower BCSM, especially in patients with locally advanced/metastatic urothelial bladder cancer.
Ethical approval
The study was approved by an ethical review board in Uppsala (DNR: 2012-361).
Disclosure statement
No potential conflict of interest was reported by the author(s).
Data availability statement
The data come from national population and health registers, and are not publicly available due to ethical restrictions.