Abbreviations: μg = microgram, CK19 = cytokeratin 19, FNAB = fine-needle aspiration biopsy, FV-PTC = follicular variant papillary thyroid carcinoma, HBME1 = hector battifora mesothelial-1, kU = kilo-units, L = liter, NRAS = NRAS proto-oncogene GTPase, PTC = papillary thyroid carcinoma, RAI = radioiodine, TCV-PTC = tall cell variant of papillary thyroid carcinoma, TTF1 = thyroid transcription factor 1. This evidence concerns the gene NKX2-1 and thyroid gland papillary carcinoma.