Abstract
Purpose To determine whether autoimmune hypothyroidism (AIHT) influences breast cancer (BRCA) incidence or all-cause survival. Methods Administrative data were used to identify elderly women living in Ontario, Canada with and without AIHT based on prescriptions for levothyroxine (LT4) (N = 178,186). Women were followed from April 1, 1994–March 31, 2003 for BRCA outcomes. Results The incidence of BRCA was similar in LT4 users and a propensity-matched cohort of non-users (adjusted HR = 0.99; 95% CI: 0.92–1.07). All-cause mortality was significantly lower in LT4 users compared to non-users (HR 0.95; 95% CI: 0.93–0.97, P < 0.001), as was all-cause mortality following BRCA diagnosis (HR 0.87; 95% CI: 0.77–0.98, P = 0.02). Conclusions LT4 use, as a surrogate for AIHT, is not a risk factor for BRCA in elderly women. The small survival advantage noted among LT4 users who developed BRCA likely represents a ‘healthy user’ effect. Further study is needed to investigate whether autoimmunity in general is related to BRCA development or related outcomes.
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Acknowledgements
The authors gratefully acknowledge the assistance of Dr. Muhammad Mamdani and Kathy Sykora for their input on the design and analysis of this study. This work was funded by the Institute for Clinical Evaluative Sciences and the University of Toronto. Dr. Sandhu is supported by Ontario’s Ministry of Health and Long-Term Care. Dr. Booth holds a new investigator award funded by the Ontario Women’s Health Council and the Canadian Institutes of Health Research. Dr. Lipscombe is supported by a Clinician Scientist award from the Canadian Diabetes Association. Dr. Brezden-Masley is supported by St Michael’s Hospital. The Institute for Clinical Evaluative Sciences receives funding from Ontario’s Ministry of Health and Long-Term Care.
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Sandhu, M.K., Brezden-Masley, C., Lipscombe, L.L. et al. Autoimmune hypothyroidism and breast cancer in the elderly. Breast Cancer Res Treat 115, 635–641 (2009). https://doi.org/10.1007/s10549-008-0104-4
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DOI: https://doi.org/10.1007/s10549-008-0104-4