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Association between breast and thyroid cancers

Authors Lehrer S, Green S, Martignetti JA, Rosenzweig KE

Received 27 November 2013

Accepted for publication 17 January 2014

Published 20 February 2014 Volume 2014:4 Pages 1—4

DOI https://doi.org/10.2147/AGG.S58346

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 4

Steven Lehrer, Sheryl Green, John A Martignetti, Kenneth E Rosenzweig

Departments of Radiation Oncology and Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA

Background: The risk of thyroid cancer is known to be slightly increased in women after treatment for breast cancer. In the current study, we analyzed the incidence of thyroid cancer and breast cancer in 50 US states and in the District of Columbia to ascertain how often these two diseases are associated.
Methods: Data on the incidence of thyroid cancer were obtained from the Centers for Disease Control and Prevention and the National Cancer Institute and data on the incidence of breast cancer were from the American Cancer Society. Data on the average number of children per family with children and mean household income were sourced from the US Bureau of the Census and prevalence of obesity by state is determined from a paper published in 2010 on state-specific obesity prevalence among US adults by the Centers for Disease Control and Prevention.
Results: There was a significant association between breast and thyroid cancer (P=0.002). Since the incidence of breast cancer increases with increasing income and obesity, while decreasing with parity, multiple linear regression was performed. Breast cancer incidence was significantly related to thyroid cancer incidence (β=0.271, P=0.039), inversely related to average number of children per family with children (β=-0.271, P=0.039), unrelated to adult obesity (β=0.134, P=0.369), and significantly related to family income (β=0.642, P<0.001).
Conclusion: This study identifies an association between breast and thyroid cancer. The association suggests that unexplored breast-thyroid cancer susceptibility loci exist and warrant further study.

Keywords: breast cancer, thyroid cancer, genetics, association

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