To determine whether the expression of PATZ1 plays a role in thyroid cancer cell growth, we carried out colony-forming assays in three thyroid cancer cell lines (TPC1, BC-PAP and FRO), transfected with a vector coding for the human PATZ1 variant 4 (HA-PATZ) or the empty vector (pCEFL-HA). This evidence concerns the gene PATZ1 and thyroid cancer.