Tohoku J. Exp. Med., 2018 March, 244(3)

Wntless Is Highly Expressed in Advanced-Stage Intrahepatic Cholangiocarcinoma

YI SHI,¹ JIANFENG BAI,¹ SHUWEI GUO² and JIANDONG WANG²

¹Department of Biliary Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
²Department of Pathology, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China

Intrahepatic cholangiocarcinoma (ICC) is an aggressive malignancy of the bile duct, representing the second most common primary liver cancer. Wntless (Wls) is a highly conserved transmembrane protein that shuttles palmitoylated Wnt proteins from the endoplasmic reticulum to the plasma membrane. Wls is highly expressed in various types of cancers and is essential for cell proliferation, anti-apoptotic activity, and survival. The profile of Wls expression and its clinical significance has not been well clarified in ICC. In the present study, we analyzed Wls expression in a set of ICC tissues (n = 44) by immunohistochemistry and the relationship between Wls expression and clinicopathological parameters. Immunoreactive Wls was detected in normal cholangiocytes, but was undetectable in normal hepatocytes. The intensity for immunoreactive Wls was varied, depending on ICC specimens. The degree of Wls expression was scored as 0 or 1+ in 8 specimens (18.2%), 2+ in 24 (54.5%), and 3+ in 12 (27.3%) out of the 44 ICC specimens, based on the staining intensity and percentage of Wls-positive cells. In normal cholangiocytes, the scores were varied from 0 to 2+. The intensity of Wls expression was positively associated with tumor stage (T stage, P = 0.005, r = 0.413), tumor-node-metastasis stage (TNM stage, P = 0.000, r = 0.548), and lymphatic invasion (P = 0.000, r = 0.548). Our results show that Wls is differentially expressed in ICC tissues and positively related to tumor stage and lymphatic invasion. Wls is a potential marker for advanced tumor stage and metastasis in ICC.

keywords —— immunohistochemistry; intrahepatic cholangiocarcinoma; tumor stage; Wnt; Wntless

© 2018 Tohoku University Medical Press

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Tohoku J. Exp. Med., 2018, 244, 195-199

Correspondence: Jianfeng Bai, Department of Biliary Surgery, The First Affiliated Hospital of Nanjing Medical University, No.300 Guangzhou Road, Nanjing 210029, China.

e-mail: 972158336@qq.com

Jiandong Wang, Department of Pathology, Jinling Hospital, Nanjing University School of Medicine, No.305 Zhong Shan Dong Lu, Nanjing 210002, China.

e-mail: jd_wang@outlook.com