Increased risk of papillary thyroid cancer in celiac disease.

Patients with celiac disease have an increased rate of malignancies that are not limited to lymphomas. Thyroid carcinoma has not previously been associated with celiac disease. However, among a cohort of patients with celiac disease, we identified an increased risk of papillary carcinoma of the thyroid, standard morbidity ratio of 22.52 (95% confidence interval 14.90-34.04; P < .001), compared to United States national surveillance data. These patients were on a gluten-free diet. Only 1 had Hashimoto's thyroiditis, suggesting that mechanisms apart from autoimmune thyroiditis contribute to the increased risk of carcinoma of the thyroid in celiac disease.