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Thyroid Hormone Changes Correlate to Combined Breast Cancer with Primary Thyroid Cancer
Jian Jin1, Jie Li1, Yonghong Liu1
1Thyroid and Breast Surgery Department, Cangzhou Central Hospital, Cangzhou, Hebei, 061000, People's Republic of China.
Background:
Breast cancer and thyroid cancer are two prevalent malignancies in women, and a potential association between the two diseases has been suggested.
Methods:
This retrospective case-control study was conducted involving 97 patients with breast cancer and thyroid cancer (BC-TC group) and 97 age-matched patients with breast cancer alone (BC group). Thyroid hormone levels, including triiodothyronine (T3), thyroxine (T4), free triiodothyronine (FT3), free thyroxine (FT4) and thyroid-stimulating hormone (TSH), were analyzed in healthy controls, BC patients, and BC-TC patients.
Results:
BC-TC patients exhibited a higher rate of estrogen receptor (ER) and progesterone receptor (PR) positivity compared to BC patients. Serum T3 levels were significantly decreased in BC and BC-TC patients compared to healthy controls. However, there was no significant difference in T3 levels between BC and BC-TC patients. Serum TSH levels were significantly higher in BC-TC patients compared to BC patients.
Conclusion:
ER positivity, PR positivity, and serum TSH levels greater than 4.45 mU/L were independent risk factors for primary thyroid cancer in breast cancer patients.
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