GLI1 and thyroid gland undifferentiated (anaplastic) carcinoma: Here we evaluated by immunohistochemistry Gli1 expression levels in a panel of 66 human tissues including: five normal thyroids, 11 benign adenomas, 10 papillary thyroid cancers (PTCs), 10 medullary thyroid cancers (MTCs), 14 follicular thyroid cancers (FTCs), and 16 anaplastic thyroid cancers (ATCs).