Thyroid Function in Patients with Cancer of the Breast.
In 47 patients with operable cancer of the breast the thyroid activity has been studied with the following tests: a) radioactive iodine uptake, 3 and 24 hours after the administration of 50 μc of I131; b) conversion rate; c) hormonal index, i. e. the quantity of protein bound radioiodine in 1 liter of plasma, evaluated as a percentage of the administered dose. The thyroid function was studied immediately before Halstead operation as well as one, three, and twelve months later. From the data obtained it appears that a) breast cancer patients show a thyroid radioiodine uptake higher than the controls, either at the 3rd or at the 24th hour, b) after the removal of the breast, the uptake decreases, reaching normal values 12 months after the operation, c) the conversion rate does not show any difference from the controls either before or after the operation, d) the hormonal index is considerably higher than normal values before operation, and in spite of a lowering after radical mastectomy, it is still higher one year later. The data seem to show that breast cancer patients have a higher metabolic activity of the thyroid gland, without clinical signs of hyperthyroidism. After removal of the carcerous breast the thyroid activity slowly decreases. However, the conversion rate is not modified as compared to the control patients. Further confirmation of the present preliminary results should be obtained by a comparative evaluation of the results either in patients with other types of tumors, or in patients subjected to surgical procedures for non-tumorous lesions.