Upregulation of long non‑coding RNA CCAT2 indicates a poor prognosis and promotes proliferation and metastasis in intrahepatic cholangiocarcinoma

Bai,Jian‑Guo; Tang,Rui‑Feng; Shang,Jun‑Feng; Qi,Shuai; Yu,Guo‑Dong; Sun,Chao

doi:10.3892/mmr.2018.8518

Upregulation of long non‑coding RNA CCAT2 indicates a poor prognosis and promotes proliferation and metastasis in intrahepatic cholangiocarcinoma

Authors:
- Jian‑Guo Bai
- Rui‑Feng Tang
- Jun‑Feng Shang
- Shuai Qi
- Guo‑Dong Yu
- Chao Sun
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Affiliations: Department of Hepatobiliary Surgery, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China, Department of General Surgery, The People's Hospital of Daming, Handan, Hebei 056900, P.R. China, Second Department of Surgery, The People's Hospital of Luancheng, Shijiazhuang, Hebei 051430, P.R. China, Department of Hepatobiliary Surgery, The Affiliated Hospital of Hebei University, Baoding, Hebei 071000, P.R. China
Published online on: January 30, 2018 https://doi.org/10.3892/mmr.2018.8518
Pages: 5328-5335

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Abstract

Intrahepatic cholangiocarcinoma (IHCC) is an aggressive cancer with a poor survival rate and is the second most common type of primary cancer of the hepatobiliary system. At present, the molecular mechanisms of IHCC initiation and progression remain unclear. Recent evidence has indicated that long non‑coding RNAs (lncRNAs) serve a crucial role in cancer development; however, the functional role of lncRNAs in IHCC has not been investigated in detail. In the present study, a marked overexpression of lncRNA colon cancer‑associated transcript 2 (CCAT2) was observed in IHCC cell lines and clinical specimens. Statistical analysis of IHCC clinicopathological characteristics and CCAT2 expression data revealed that high CCAT2 expression levels correlated with microvascular invasion, differentiation grade, tumor (T), lymph node (N), metastasis (M) and overall TNM stages of IHCC (P<0.05). Kaplan‑Meier analysis demonstrated that CCAT2 upregulation was associated with poor overall survival and progression‑free survival in IHCC. Furthermore, high CCAT2 expression was identified as an independent risk factor of IHCC poor prognosis in both univariate and multivariate Cox regression analyses. The role of CCAT2 in promoting IHCC cell proliferation, motility and invasion was further confirmed with in vitro assays. Therefore, CCAT2 may promote IHCC progression and metastasis, and may be a promising prognostic biomarker and therapeutic target in IHCC.

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