Thyroid cancer and benign thyroid disease in patients with familial adenomatous polyposis (FAP): Memorial Sloan-Kettering Cancer Center (MSKCC) registry experience

Results Sixty six patients with FAP were identified in the registry. This included 30 men and 36 women, with current mean age of 40.6 years. Four patients (6.1%) had a history of thyroid cancer (TC), and underwent thyroidectomy. All TC patients were women, with mean age at cancer diagnosis of 36 years. Three of the 4 known TC diagnoses were papillary thyroid cancer. One patient initially presented with tender thyroid nodule. Another patient with attenuated FAP and a documented APC R332X mutation had a nodule detected on ultrasound. APC mutation testing in the other 3 TC patients is not known. An additional 6 FAP patients (9.1%) were diagnosed with benign thyroid disease, including one with Hashimoto’s thyroiditis, 2 with thyroid nodules, 1 with thyroid cysts, and 2 with multinodular goiter.