[Hyperthyroidism and cancer of the thyroid]

Area of Science:

• Endocrinology
• Oncology
• Surgical Pathology

Background:

• The link between hyperthyroidism (Graves' disease, toxic nodular goiters) and thyroid cancer is not well-defined.
• Thyroid carcinoma incidence varies (0.3%–16.6%), with higher rates in toxic nodular goiters and endemic areas.
• Occult thyroid cancer is common, often undetected preoperatively by imaging or fine-needle aspiration.

Purpose of the Study:

• To investigate the incidence and outcomes of thyroid cancer coexisting with hyperthyroidism.
• To evaluate the impact of concomitant malignancy on the management of hyperthyroid patients.

Main Methods:

• Retrospective analysis of 11 patients with thyroid cancer and hyperthyroidism (Graves' disease or toxic nodular goiter) between 1979-1991.
• Review of pathological findings (papillary, follicular carcinoma) and surgical procedures (subtotal/total thyroidectomy, lymphadenectomy).
• Assessment of patient outcomes and follow-up duration (mean 91.8 months).

Main Results:

• Eight papillary and three follicular thyroid cancers were identified in 11 hyperthyroid patients.
• Malignancy was diagnosed intraoperatively (frozen section) in 2 patients and postoperatively (permanent section) in 9.
• All patients remained disease-free with a mean follow-up of over 7.5 years.

Conclusions:

• Concomitant thyroid malignancy and hyperthyroidism are rare.
• The presence of cancer does not negatively impact prognosis in these patients.
• Standard surgical treatment (total thyroidectomy) for hyperthyroidism effectively manages coexisting thyroid cancer.