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Thyroid-Stimulating Hormone and Prolactin Levels in Breast Cancer

Keith A. Aldinger, MD; Pamela N. Schultz; George R. Blumenschein, MD; Naguib A. Samaan, MD, PhD
Arch Intern Med. 1978;138(11):1638-1641. doi:10.1001/archinte.1978.03630360028015.
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Serum thyroid-stimulating hormone (TSH) and prolactin (PRL) levels were measured before and after intravenous administration of protirelin to 148 patients with breast carcinoma. There was a high prevalence (36%) of elevated basal TSH; however, most of the patients were euthyroid and had normal serum thyroxine and T3 resin uptake. The PRL level was elevated in 22% of the cases. Both the mean PRL and the mean TSH levels for the breast cancer patients were significantly elevated above the respective means in a control group.

We could find no correlation between serum TSH and PRL levels, suggesting that the purported association between a decreased thyroid state and breast cancer is probably not mediated through an increased PRL level. The mean survival and mean disease-free interval were shorter for patients with either elevated TSH or elevated PRL levels, but in neither case was the difference statistically significant.

(Arch Intern Med 138:1638-1641, 1978)

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