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Role of Cancer Stem Cells in Cholangiocarcinoma and Therapeutic Implications
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Role of Cancer Stem Cells in Cholangiocarcinoma and Therapeutic Implications
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Journal Article
Role of Cancer Stem Cells in Cholangiocarcinoma and Therapeutic Implications
2019
Overview
Cholangiocarcinoma (CCA) is the second most common type of liver cancer, and is highly aggressive with very poor prognosis. CCA is classified into intrahepatic cholangiocarcinoma (iCCA) and extra-hepatic cholangiocarcinoma (eCCA), which is further stratified into perihilar (pCCA) and distal (dCCA). Cancer stem cells (CSCs) are a subpopulation of cancer cells capable of tumor initiation and malignant growth, and are also responsible for chemoresistance. Thus, CSCs play an important role in CCA carcinogenesis. Surface markers such as CD133, CD24, CD44, EpCAM, Sox2, CD49f, and CD117 are important for identifying and isolating CCA CSCs. CSCs are present in the tumor microenvironment (TME), termed ‘CSC niche’, where cellular components and soluble factors interact to promote tumor initiation. Epithelial-to-mesenchymal transition (EMT) is another important mechanism underlying carcinogenesis, involved in the invasiveness, metastasis and chemoresistance of cancer. It has been demonstrated that EMT plays a critical role in generating CSCs. Therapies targeting the surface markers and signaling pathways of CCA CSCs, proteins involved in TME, and immune checkpoint proteins are currently under investigation. Therefore, this review focuses on recent studies on the roles of CSCs in CCA; the possible therapeutic strategies targeting CSCs of CCA are also discussed.
Publisher
MDPI AG,MDPI
Subject
/ Bile
/ Bile Duct Neoplasms - etiology
/ Bile Duct Neoplasms - metabolism
/ Bile Duct Neoplasms - pathology
/ Bile Duct Neoplasms - therapy
/ Cholangiocarcinoma - etiology
/ Cholangiocarcinoma - metabolism
/ Cholangiocarcinoma - pathology
/ Cholangiocarcinoma - therapy
/ Epithelial-Mesenchymal Transition
/ Humans
/ Kinases
/ Neoplastic Stem Cells - metabolism
/ Review
/ Roles
/ Studies
/ Tumors
