Suppressive therapy for postirradiation thyroid nodules.

From the thyroid screening program at the Roswell Park Memorial Institute in Buffalo, New York, 85 patients with thyroid nodules who had received previous irradiation to the head and neck were identified. The diagnosis was confirmed microscopically by needle aspiration cytology and the patients were treated with thyroid replacement therapy. In 24 patients, the nodules disappeared completely; a partial response (more than 50% reduction in size) was seen in 26; 11 patients were improved (20% to 50% reduction in size); 14 had stable disease (less than 20% reduction in nodule size) and in 10 the condition progressed (an increase of more than 20% in nodule size). Six of 21 patients who underwent operation had well differentiated tumours. The number of cases of Hashimoto's thyroiditis (14) was high. Suppressive therapy will separate those patients whose nodules will disappear completely and who will thus be spared operation. Continued follow-up of such patients is essential. All other patients should be offered operation since thyroid nodules are malignant in 30% of cases.