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Wright CM, Moorin RE, Chowdhury EK, Stricker BH, Reid CM, Saunders CM, Hughes JD. Calcium channel blockers and breast cancer incidence: An updated systematic review and meta-analysis of the evidence. Cancer Epidemiol 2017; 50:113-124. [PMID: 28866282 DOI: 10.1016/j.canep.2017.08.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 08/15/2017] [Accepted: 08/19/2017] [Indexed: 12/18/2022]
Abstract
Controversy exists regarding the potential association between taking calcium channel blockers (CCBs) and the development of breast cancer. As a positive association would have important public health implications due to the widespread use of CCBs, this study aimed to incorporate new evidence to determine whether an association is likely to exist. We searched MEDLINE, EMBASE and the Cochrane Library to 28 June 2016 for relevant literature. References and citing articles were checked and authors contacted as necessary. Two authors independently selected articles and extracted data. Twenty-nine studies were reviewed; 26 were non-randomised studies (NRS). Meta-analysis of study data where adjustment for 'confounding by indication' was judged to be present suggests that an association, if any, is likely to be modest in magnitude (pooled odds/risk ratio 1.09 (95% confidence interval (CI) 1.03-1.15, I2=0%, 8 sub-studies; pooled hazard ratio 0.99 (95% CI 0.94-1.03, I2=35%, 9 sub-studies)). There are credible study data showing an increased relative risk with long-term use of CCBs, but the results of our meta-analysis and of meta-regression of log relative risk against minimum follow-up time are mixed. The current summative evidence does not support a clear association between taking CCBs and developing breast cancer. However, uncertainty remains, especially for long-term use and any association might not be uniform between different populations and/or breast cancer sub-types. We thus recommend further NRS in settings where CCB use is highly prevalent and population-based cancer, prescription and health-registries exist, to resolve this continuing uncertainty. PROSPERO, CRD42015026712.
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Affiliation(s)
- Cameron M Wright
- Health Systems and Health Economics, School of Public Health, Faculty of Health Sciences, GPO Box U1987, Curtin University, Perth, Western Australia, 6845, Australia; School of Pharmacy, Faculty of Health Sciences, GPO Box U1987, Curtin University, Perth, Western Australia, 6845, Australia; School of Medicine, University of Tasmania, Private Bag 26, Sandy Bay, Tasmania, 7001, Australia.
| | - Rachael E Moorin
- Health Systems and Health Economics, School of Public Health, Faculty of Health Sciences, GPO Box U1987, Curtin University, Perth, Western Australia, 6845, Australia; Centre for Health Services Research, School of Population and Global Health, Faculty of Medicine, Dentistry and Health Sciences, 35 Stirling Highway, University of Western Australia, Crawley, Perth, Western Australia, 6009, Australia.
| | - Enayet K Chowdhury
- Centre for Cardiovascular Research and Education in Therapeutics, Monash University, Melbourne, Victoria, 3800, Australia.
| | - Bruno H Stricker
- Department of Epidemiology, Erasmus MC: University Medical Centre, Rotterdam, 3015, Netherlands.
| | - Christopher M Reid
- School of Pharmacy, Faculty of Health Sciences, GPO Box U1987, Curtin University, Perth, Western Australia, 6845, Australia; School of Public Health, Faculty of Health Sciences, GPO Box 1987, Curtin University, Perth, Western Australia, 6845, Australia.
| | - Christobel M Saunders
- School of Surgery, Faculty of Medicine, Dentistry and Health Sciences, 35 Stirling Highway, University of Western Australia, Perth, Western Australia, 6009, Australia.
| | - Jeffery D Hughes
- School of Pharmacy, Faculty of Health Sciences, GPO Box U1987, Curtin University, Perth, Western Australia, 6845, Australia.
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