HMGA2 and adenocarcinoma: The positive rate of HMGA2 expression from the cases that had well-differentiated adenocarcinoma, with the largest tumor diameter <2 cm, and without lymph node metastasis, and that did not invade the surrounding tissue was significantly lower than that of HMGA2 expression from the cases that had poorly differentiated adenocarcinoma, with the largest tumor diameter ≥2 cm, lymph node metastasis, and that invaded the surrounding tissues (P <0.05 or P <0.01).