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Next Viable Routes to Targeting Pancreatic Cancer Stemness: Learning from Clinical Setbacks

Laboratory of Advanced Molecular Therapeutics, Division of Gastroenterology, Department of Internal Medicine, Integrative Therapy Center for Gastroenterologic Cancers, Wan Fang Hospital, Taipei Medical University, Taipei 11696, Taiwan
Graduate Institute of Clinical Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan
National Institute of Cancer Research, National Health Research Institutes, Miaoli 35053, Taiwan
Department of Cell Biology and Cancer Science, Rappaport Faculty of Medicine, Technion Integrated Cancer Center, Technion—Israel Institute of Technology, Haifa 3525433, Israel
Author to whom correspondence should be addressed.
J. Clin. Med. 2019, 8(5), 702;
Received: 27 April 2019 / Revised: 8 May 2019 / Accepted: 15 May 2019 / Published: 17 May 2019
PDF [3556 KB, uploaded 17 May 2019]
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Pancreatic ductal adenocarcinoma (PDAC) is a devastating and highly aggressive malignancy. Existing therapeutic strategies only provide a small survival benefit in patients with PDAC. Laboratory and clinical research have identified various populations of stem-cell-like cancer cells or cancer stem cells (CSCs) as the driving force of PDAC progression, treatment-resistance, and metastasis. Whilst a number of therapeutics aiming at inhibiting or killing CSCs have been developed over the past decade, a series of notable clinical trial setbacks have led to their deprioritization from the pipelines, triggering efforts to refine the current CSC model and exploit alternative therapeutic strategies. This review describes the current and the evolving models of pancreatic CSCs (panCSCs) and the potential factors that hamper the clinical development of panCSC-targeted therapies, emphasizing the heterogeneity, the plasticity, and the non-binary pattern of cancer stemness, as well as the desmoplastic stroma impeding drug penetration. We summarized novel and promising therapeutic strategies implicated by the works of our groups and others’ that may overcome these hurdles and have shown efficacies in preclinical models of PDAC, emphasizing the unique advantages of targeting the stroma-engendered panCSC-niches and metronomic chemotherapy. Finally, we proposed feasible clinical trial strategies and biomarkers that can guide the next-generation clinical trials. View Full-Text
Keywords: cancer stemness; pancreatic ductal adenocarcinoma; stroma; therapeutics; clinical trials cancer stemness; pancreatic ductal adenocarcinoma; stroma; therapeutics; clinical trials

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Tsai, K.K.; Chan, T.-S.; Shaked, Y. Next Viable Routes to Targeting Pancreatic Cancer Stemness: Learning from Clinical Setbacks. J. Clin. Med. 2019, 8, 702.

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