– Thyroid hormone receptor beta (THRB), also known as TRbeta and NR1A2, belongs to the nuclear hormone receptor family. Featuring an N-terminal transactivation domain, a central DNA-binding domain, and a hormone/ligand-binding domain, THRB isoform 1/2 expression localizes predominately to the liver and pituitary, respectively. THRB regulates the feedback of T3-dependent thyrotropin-stimulating hormone (TSH) transcription in the pituitary by binding to thyroid hormone (TH) response elements present on promoters of TH-responsive genes. Located on chromosome 3p24, THRB gene mutation has been linked to autosomal dominant resistance to TH (RTH), which is characterized by goiter and elevated levels of T3, T4, and TSH. THRB is a known pharmacological target for the treatment of non-alcoholic steatohepatitis (NASH). THRB may be a target for future cancer therapies since its knockdown enhanced the viability of endometrial cancer cells and activated the mTOR-4EBP1/eIF4G pathway.