PBX3 and thyroid gland papillary carcinoma: Preleukemia transcription factor 3 (PBX3) is part of the PBX family, and has been found to be a tumor‐promoting gene in several human tumors, such as cervical cancer24 and papillary thyroid carcinoma.25 We confirmed that PBX3 was a target gene of miR‐4458.