PTTG1 and thyroid gland papillary carcinoma: We also evaluated the expression of PTTG1 by western blot on 6 MTC patients (a small representative number of patients), 2 controls (healthy thyroid), and 1 patient with papillary thyroid carcinoma (PTC), used as positive control (it has been reported to express elevated quantities of PTTG1 [21]).