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September 6, 1976, Vol 236, No. 10 >
ARTICLE | September 6, 1976

Breast Cancer:  Relationship to Thyroid Supplements for Hypothyroidism

Chandrakant C. Kapdi, MD; John N. Wolfe, MD
JAMA. 1976;236(10):1124-1127. doi:10.1001/jama.1976.03270110022020.
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This study was undertaken to determine the relationship between thyroid supplements and breast cancer. The incidence of breast cancer among the patients who received thyroid supplements was 12.13%, while in the control group it was 6.2%. The incidence rate of breast cancer was 10%, 9.42%, and 19.48% among patients who received thyroid supplements for one to five, 5 to 15, and for more than 15 years, respectively. The incidence of breast cancer among nulliparous women who received thyroid supplements was 33%, while in the nulliparous women without thyroid supplements the incidence was only 9.25%. Even in a specific age group, the incidence rate of breast cancer was higher among patients receiving thyroid supplements, when compared to the control patients in the same age group.

(JAMA 236:1124-1127, 1976)

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