Consistent with this finding, Nehal et al. [31] have demonstrated that, in a series of thyroid lesions, CK-19 was expressed in all the papillary thyroid carcinoma specimens, as well as in 87.5% of adenomatous hyperplasia, whereas it was absent in follicular adenomas and follicular carcinomas. The gene discussed is KRT19; the disease is differentiated thyroid carcinoma.