THRB and thyroid gland papillary carcinoma: In this context, increased levels of miR-21, -146a, -181a and -221, all predicted to target THRβ, were found in papillary thyroid cancer (PTC) patients, in association with low levels of THRβ transcripts (25); moreover, THRβ expression in human clear cell renal carcinomas (ccRCC) was inversely correlated with that of miR-204 (26).