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Surg Oncol. 2019 Jun;29:41-47. doi: 10.1016/j.suronc.2019.01.013. Epub 2019 Feb 14.

The expressions of HMGA2 and Thy1 in extrahepatic cholangiocarcinoma and their clinicopathological significances.

Author information

1
Laboratory of Medical Molecular and Immunological Diagnostics, School of Medicine, Hunan Normal University, Changsha, Hunan, 410013, PR China.
2
Department of General Surgery, Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, PR China. Electronic address: yangzhulin8@csu.edu.cn.
3
Department of General Surgery, Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, PR China.
4
Department of Pathology, Second Xiangya Hospital, Central South University, Changsha, Hunan, 410013, PR China.
5
Department of Pathology, Third Xiangya Hospital, Central South University, Changsha, Hunan, 410013, PR China.

Abstract

AIMS:

Extrahepatic cholangiocarcinoma is a malignant tumor and poor prognosis with intrinsic resistance to cytotoxic agents. The molecular mechanism associated with high malignancy and resistance to chemotherapy and radiotherapy has not been fully elucidated. This study aims to investigate the clinicopathological significances of HMGA2 and Thy1 expression in extrahepatic cholangiocarcinoma.

METHODS:

The expressions of HMGA2 and Thy1 in 100 extrahepatic cholangiocarcinoma, 30 peritumoral tissues, 10 adenoma and 15 normal biliary tract tissues were assayed using EnVision immunohistochemistry.

RESULTS:

The HMGA2 and Thy1 proteins were overexpression in extrahepatic cholangiocarcinoma compared to peritumoral tissues, adenoma, and normal biliary tract tissues (P < 0.05 or P < 0.01). Adenoma and pericancerous tissues with positive HMGA2 or/and Thy1 protein expression exhibited atypical hyperplasia. The positive correlation was found between the expression of HMGA2 and Thy1 in extrahepatic cholangiocarcinoma (P < 0.01). The positive rates of HMGA2 and Thy1 expression were significantly higher in cases with poor differentiation, lymph node metastasis, invasion, and TNM stage III or IV and no resection (biopsy only) (P < 0.05 or P < 0.01). Kaplan-Meier survival analysis showed that the survival of extrahepatic cholangiocarcinoma patients with positive HMGA2 and/or Thy1 expression is significantly shorter than patients with negative HMGA2 and/or Thy1 expression (P = 0.000). Cox multivariate analysis revealed that positive HMGA2 and/or Thy1 expressions were independently poor prognosis factors in extrahepatic cholangiocarcinoma patients. We calculated the AUC for HMGA2 (AUC = 0.610, 95%CI: 0.519-0.702), or Thy1 (AUC = 0.675, 95%CI: 0.588-0.762), respectively.

CONCLUSIONS:

The present study indicated that positive HMGA2 and Thy1 expression are closely associated with the pathogenesis, clinical, pathological and biological behaviors, and poor prognosis in patients with extrahepatic cholangiocarcinoma.

KEYWORDS:

Biliary tract adenoma; Extrahepatic cholangiocarcinoma; HMGA2; Immunohistochemistry; Thy1

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