TG and neoplasm: It is well documented that the interaction between thyroid hormones (L-thyroxine (T4) and 3,5,3'-triiodo-L-thyronine (T3) promotes cell proliferation, tumor angiogenesis, and organ-specific metastasis in various types of cancers including breast, lung, glioma, pancreatic, and neuroblastoma, respectively 6-10.