HLTF and follicular thyroid adenoma: The present study shows for the first time that follicular adenomas present specific nuclear HLTF immunostaining (using the ART2 rabbit anti-serum recognizing the HLTF wild type protein as well as the two HLTF variants, HLTFMet1ΔA and HLTFMet1ΔB), whereas papillary carcinomas exhibit cytoplasmic expression.