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Implications of the Hybrid Epithelial/Mesenchymal Phenotype in Metastasis

Mohit Kumar Jolly

Frontiers in Oncology · 2015 · Review

doi:10.3389/fonc.2015.00155

Abstract

Transitions between epithelial and mesenchymal phenotypes - the epithelial to -mesenchymal transition (EMT) and its reverse the mesenchymal to epithelial transition (MET) - are hallmarks of cancer metastasis. While transitioning between the epithelial and mesenchymal phenotypes, cells can also attain a hybrid epithelial/mesenchymal (E/M) (i.e., partial or intermediate EMT) phenotype. Cells in this phenotype have mixed epithelial (e.g., adhesion) and mesenchymal (e.g., migration) properties, thereby allowing them to move collectively as clusters. If these clusters reach the bloodstream intact, they can give rise to clusters of circulating tumor cells (CTCs), as have often been seen experimentally. Here, we review the operating principles of the core regulatory network for EMT/MET that acts as a "three-way" switch giving rise to three distinct phenotypes - E, M and hybrid E/M - and present a theoretical framework that can elucidate the role of many other players in regulating epithelial plasticity. Furthermore, we highlight recent studies on partial EMT and its association with drug resistance and tumor-initiating potential; and discuss how cell-cell communication between cells in a partial EMT phenotype can enable the formation of clusters of CTCs. These clusters can be more apoptosis-resistant and have more tumor-initiating potential than singly moving CTCs with a wholly mesenchymal (complete EMT) phenotype. Also, more such clusters can be formed under inflammatory conditions that are often generated by various therapies. Finally, we discuss the multiple advantages that the partial EMT or hybrid E/M phenotype have as compared to a complete EMT phenotype and argue that these collectively migrating cells are the primary "bad actors" of metastasis.

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  118. 118.

    Fidler IJ The relationship of embolic homogeneity, number, size and viability to the incidence of experimental metastasis. Eur J Cancer (1973 ) 9:223–7.

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  119. 119.

    Hugo H Ackland LM Blick T Lawrence MG Clementa JA Williams ED Epithelial-mesenchymal and mesenchymal-epithelial transitions in carcinoma progression. J Cell Physiol (2007 ) 213:374–83.

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  120. 120.

    Alix-Panabières C Pantel K. Challenges in circulating tumour cell research. Nat Rev Cancer (2014 ) 14:623.

    Not in our library10.1038/nrc3820

  121. 121.
  122. 122.

    Baccelli I Schneeweiss A Riethdorf S Stenzinger A Schillert A Vogel V Identification of a population of blood circulating tumor cells from breast cancer patients that initiates metastasis in a xenograft assay. Nat Biotechnol (2013 ) 31:539–44.

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  123. 123.

    Cayrefourcq L Mazard T Joosse S Solassol J Ramos J Assenat E Establishment and characterization of a cell line from human circulating colon cancer cells. Cancer Res (2015 ) 75:892–902.

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  124. 124.
  125. 125.

    Plaks V Kong N Werb Z. The cancer stem cell niche: how essential is the niche in regulating stemness of tumor cells? Cell Stem Cell (2015 ) 16:225–38.

    Not in our library10.1016/j.stem.2015.02.015

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    Gupta PB Fillmore CM Jiang G Shapira SD Tao K Kuperwasser C Stochastic state transitions give rise to phenotypic equilibrium in populations of cancer cells. Cell (2011 ) 146:633–44.

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  127. 127.

    Yang G Quan Y Wang W Fu Q Wu J Mei T Dynamic equilibrium between cancer stem cells and non-stem cancer cells in human SW620 and MCF-7 cancer cell populations. Br J Cancer (2012 ) 106:1512–9.

    Not in our library10.1038/bjc.2012.126

  128. 128.

    Iliopoulos D Hirsch HA Wang G Struhl K. Inducible formation of breast cancer stem cells and their dynamic equilibrium with non-stem cancer cells via IL6 secretion. Proc Natl Acad Sci U S A (2011 ) 108:1397–402.

    Not in our library10.1073/pnas.1018898108

  129. 129.

    Enderling H. Cancer stem cells: small subpopulation or evolving fraction? Integr Biol (Camb) (2015 ) 7:14–23.

    Not in our library10.1039/c4ib00191e

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    Csermely P Hódsági J Korcsmáros T Módos D Perez-Lopez ÁR Szalay K Cancer stem cells display extremely large evolvability: alternating plastic and rigid networks as a potential mechanism network models, novel therapeutic target strategies, and the contributions of hypoxia, inflammation and cellular senescence. Semin Cancer Biol (2015 ) 30:42–51.

    Not in our library10.1016/j.semcancer.2013.12.004

  131. 131.

    Mani SA Guo W Liao M-J Eaton EN Ayyanan A Zhou AY The epithelial-mesenchymal transition generates cells with properties of stem cells. Cell (2008 ) 133:704–15.

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  132. 132.
  133. 133.

    Scheel C Weinberg RA. Cancer stem cells and epithelial-mesenchymal transition: concepts and molecular links. Semin Cancer Biol (2012 ) 22:396–403.

    Not in our library10.1016/j.semcancer.2012.04.001

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    Ombrato L Malanchi I. The EMT universe: space between cancer cell dissemination and metastasis initiation. Crit Rev Oncog (2014 ) 19:349–61.

    Not in our library10.1615/critrevoncog.2014011802

  135. 135.

    Celià-Terrassa T Meca-Cortés Ó Mateo F De Paz AM Rubio N Arnal-Estapé A Epithelial-mesenchymal transition can suppress major attributes of human epithelial tumor-initiating cells. J Clin Invest (2012 ) 122:1849–68.

    Not in our library10.1172/jci59218

  136. 136.

    Ocaña OH Córcoles R Fabra A Moreno-Bueno G Acloque H Vega S Metastatic colonization requires the repression of the epithelial-mesenchymal transition inducer Prrx1. Cancer Cell (2012 ) 22:709–24.

    Not in our library10.1016/j.ccr.2012.10.012

  137. 137.

    Tsai JH Donaher JL Murphy DA Chau S Yang J. Spatiotemporal regulation of epithelial-mesenchymal transition is essential for squamous cell carcinoma metastasis. Cancer Cell (2012 ) 22:725–36.

    Not in our library10.1016/j.ccr.2012.09.022

  138. 138.

    Tsuji T Ibaragi S Shima K Hu MG Katsurano M Sasaki A Epithelial-mesenchymal transition induced by growth suppressor p12 CDK2-AP1 promotes tumor cell local invasion but suppresses distant colony growth. Cancer Res (2008 ) 68:10377–86.

    Not in our library10.1158/0008-5472.can-08-1444

  139. 139.

    Samavarchi-Tehrani P Golipour A David L Sung HK Beyer TA Datti A Functional genomics reveals a BMP-driven mesenchymal-to-epithelial transition in the initiation of somatic cell reprogramming. Cell Stem Cell (2010 ) 7:64–77.

    Not in our library10.1016/j.stem.2010.04.015

  140. 140.

    Li R Liang J Ni S Zhou T Qing X Li H A mesenchymal-to-epithelial transition initiates and is required for the nuclear reprogramming of mouse fibroblasts. Cell Stem Cell (2010 ) 7:51–63.

    Not in our library10.1016/j.stem.2010.04.014

  141. 141.

    Jolly MK Huang B Lu M Mani SA Levine H Ben-Jacob E. Towards elucidating the connection between epithelial − mesenchymal transitions and stemness. J R Soc Interface (2014 ) 11:20140962.

    Not in our library10.1098/rsif.2014.0962

  142. 142.

    Yovchev MI Grozdanov PN Zhou H Racherla H Guha C Dabeva MD. Identification of adult hepatic progenitor cells capable of repopulating injured rat liver. Hepatology (2008 ) 47:636–47.

    Not in our library10.1002/hep.22047

  143. 143.

    Conigliaro A Amicone L Costa V De Santis Puzzonia M Mancone C Sacchetti B Evidence for a common progenitor of epithelial and mesenchymal components of the liver. Cell Death Differ (2013 ) 20:1116–23.

    Not in our library10.1038/cdd.2013.49

  144. 144.

    Cicchini C Amicone L Alonzi T Marchetti A Mancone C Tripodi M. Molecular mechanisms controlling the phenotype and the EMT/MET dynamics of hepatocyte. Liver Int (2015 ) 35:302–10.

    Not in our library10.1111/liv.12577

  145. 145.

    Choi SS Diehl AM Epithelial-to-mesenchymal transitions in the liver. Hepatology (2009 ) 50:2007–13.

    Not in our library10.1002/hep.23196

  146. 146.

    Swetha G Chandra V Phadnis S Bhonde R. Glomerular parietal epithelial cells of adult murine kidney undergo EMT to generate cells with traits of renal progenitors. J Cell Mol Med (2011 ) 15:396–413.

    Not in our library10.1111/j.1582-4934.2009.00937.x

  147. 147.

    Tam WL Weinberg RA. The epigenetics of epithelial-mesenchymal plasticity in cancer. Nat Med (2013 ) 19:1438–49.

    Not in our library10.1038/nm.3336

  148. 148.

    Das R Gregory PA Hollier BG Tilley WD Selth LA. Epithelial plasticity in prostate cancer: principles and clinical perspectives. Trends Mol Med (2014 ) 20:643–51.

    Not in our library10.1016/j.molmed.2014.09.004

  149. 149.

    Ansieau S Collin G Hill L EMT or EMT-promoting transcription factors, where to focus the light? Front Oncol (2014 ) 4:353

    Not in our library10.3389/fonc.2014.00353

  150. 150.

    Strauss R Hamerlik P Lieber A Bartek J. Regulation of stem cell plasticity: mechanisms and relevance to tissue biology and cancer. Mol Ther (2012 ) 20:887–97.

    Not in our library10.1038/mt.2012.2

  151. 151.

    Liu S Cong Y Wang D Sun Y Deng L Liu Y Breast cancer stem cells transition between epithelial and mesenchymal states reflective of their normal counterparts. Stem Cell Reports (2014 ) 2:78–91.

    Not in our library10.1016/j.stemcr.2013.11.009

  152. 152.

    Biddle A Liang X Gammon L Fazil B Harper LJ Emich H Cancer stem cells in squamous cell carcinoma switch between two distinct phenotypes that are preferentially migratory or proliferative. Cancer Res (2011 ) 71:5317–26.

    Not in our library10.1158/0008-5472.can-11-1059

  153. 153.

    Brabletz T. To differentiate or not – routes towards metastasis. Nat Rev Cancer (2012 ) 12:425–36.

    Not in our library10.1038/nrc3265

  154. 154.

    Barriere G Fici P Gallerani G Fabbri F Rigaud M. Epithelial mesenchymal transition: a double-edged sword. Clin Transl Med (2015 ) 4:4–9.

    Not in our library10.1186/s40169-015-0055-4

  155. 155.

    Li C Heidt DG Dalerba P Burant CF Zhang L Adsay V Identification of pancreatic cancer stem cells. Cancer Res (2007 ) 67:1030–7.

    Not in our library10.1158/0008-5472.can-06-2030

  156. 156.

    Zhang C Li C He F Cai Y Yang H. Identification of CD44+CD24+ gastric cancer stem cells. J Cancer Res Clin Oncol (2011 ) 137:1679–86.

    Not in our library10.1007/s00432-011-1038-5

  157. 157.

    Uccelli A Moretta L Pistoia V. Mesenchymal stem cells in health and disease. Nat Rev Immunol (2008 ) 8:726–36.

    Not in our library10.1038/nri2395

  158. 158.
  159. 159.

    Al-Hajj M Wicha MS Benito-Hernandez A Morrison SJ Clarke MF. Prospective identification of tumorigenic breast cancer cells. Proc Natl Acad Sci U S A (2003 ) 100:3983–8.

    Not in our library10.1073/pnas.0530291100

  160. 160.
  161. 161.

    Azzam DJ Zhao D Sun J Minn AJ Ranganathan P Drews-Elger K Triple negative breast cancer initiating cell subsets differ in functional and molecular characteristics and in γ-secretase inhibitor drug responses. EMBO Mol Med (2013 ) 5:1502–22.

    Not in our library10.1002/emmm.201302558

  162. 162.
  163. 163.
  164. 164.

    Giannoni E Bianchini F Masieri L Serni S Torre E Calorini L Reciprocal activation of prostate cancer cells and cancer-associated fibroblasts stimulates epithelial-mesenchymal transition and cancer stemness. Cancer Res (2010 ) 70:6945–56.

    Not in our library10.1158/0008-5472.can-10-0785

  165. 165.

    Yang KR Mooney SM Zarif JC Coffey DS Taichman RS Pienta KJ. Niche inheritance: a cooperative pathway to enhance cancer cell fitness though ecosystem engineering. J Cell Biochem (2014 ) 115:1478–85.

    Not in our library10.1002/jcb.24813

  166. 166.

    Chen W-J Ho C-C Chang Y-L Chen HY Lin CA Ling T-Y Cancer-associated fibroblasts regulate the plasticity of lung cancer stemness via paracrine signalling. Nat Commun (2014 ) 5:3472.

    Not in our library10.1038/ncomms4472

  167. 167.

    Sanità P Capulli M Teti A Galatioto GP Vicentini C Chiarugi P Tumor-stroma metabolic relationship based on lactate shuttle can sustain prostate cancer progression. BMC Cancer (2014 ) 14:154.

    Not in our library10.1186/1471-2407-14-154

  168. 168.

    Duda DG Duvyerman AMMJ Kohno M Snuderi M Snuderi M Steller EJ Malignant cells facilitate lung metastasis by bringing their own soil. Proc Natl Acad Sci U S A (2007 ) 107:21677–82.

    Not in our library10.1073/pnas.1016234107

  169. 169.
  170. 170.

    Espinoza I Miele L. Deadly crosstalk: Notch signaling at the intersection of EMT and cancer stem cells. Cancer Lett (2013 ) 341:41–5.

    Not in our library10.1016/j.canlet.2013.08.027

  171. 171.
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    Boareto M Jolly MK Lu M Onuchic JN Clementi C Ben-Jacob E. Jagged-delta asymmetry in Notch signaling can give rise to a sender/receiver hybrid phenotype. Proc Natl Acad Sci U S A (2015 ) 112:E402–9.

    Not in our library10.1073/pnas.1416287112

  173. 173.

    Jolly MK Boareto M Lu M Onuchic JN Clementi C Ben-Jacob E Operating principles of Notch-delta-jagged module of cell-cell communication. New J Phys (2015 ) 17:055021

    Not in our library10.1088/1367-2630/17/5/055021

  174. 174.

    Lu J Ye X Fan F Xia L Bhattacharya R Bellister S Endothelial cells promote the colorectal cancer stem cell phenotype through a soluble form of jagged-1. Cancer Cell (2013 ) 23:171–85.

    Not in our library10.1016/j.ccr.2012.12.021

  175. 175.

    Yamamoto M Taguchi Y Ito-Kureha T Semba K Yamaguchi N Inoue J. NF-κB non-cell-autonomously regulates cancer stem cell populations in the basal-like breast cancer subtype. Nat Commun (2013 ) 4:2299.

    Not in our library10.1038/ncomms3299

  176. 176.

    Sethi N Dai X Winter CG Kang Y. Tumor-derived JAGGED1 promotes osteolytic bone metastasis of breast cancer by engaging Notch signaling in bone cells. Cancer Cell (2011 ) 19:192–205.

    Not in our library10.1016/j.ccr.2010.12.022

  177. 177.

    Sansone P Storci G Tavolari S Guarnieri T Giovannini C Taffurelli M IL-6 triggers malignant features in mammospheres from human ductal breast carcinoma and normal mammary gland. J Clin Invest (2007 ) 117:3988–4002.

    Not in our library10.1172/jci32533

  178. 178.

    Shaya O Sprinzak D. From Notch signaling to fine-grained patterning: modeling meets experiments. Curr Opin Genet Dev (2011 ) 21:732–9.

    Not in our library10.1016/j.gde.2011.07.007

  179. 179.

    Petrovic J Formosa-Jordan P Luna-Escalante JC Abelló G Ibañes M Neves J Ligand-dependent Notch signaling strength orchestrates lateral induction and lateral inhibition in the developing inner ear. Development (2014 ) 141:2313–24.

    Not in our library10.1242/dev.108100

  180. 180.

    Owen MR Sherratt JA Wearing HJ. Lateral induction by juxtacrine signaling is a new mechanism for pattern formation. Dev Biol (2000 ) 217:54–61.

    Not in our library10.1006/dbio.1999.9536

  181. 181.

    Hartman BH Reh TA Bermingham-McDonogh O. Notch signaling specifies prosensory domains via lateral induction in the developing mammalian inner ear. Proc Natl Acad Sci U S A (2010 ) 107:15792–7.

    Not in our library10.1073/pnas.1002827107

  182. 182.
  183. 183.

    Brabletz S Bajdak K Meidhof S Burk U Niedermann G Firat E The ZEB1/miR-200 feedback loop controls Notch signalling in cancer cells. EMBO J (2011 ) 30:770–82.

    Not in our library10.1038/emboj.2010.349

  184. 184.
  185. 185.

    Bu P Chen K-Y Chen JH Wang L Walters J Shin YJ A microRNA miR-34a-regulated bimodal switch targets Notch in colon cancer stem cells. Cell Stem Cell (2013 ) 12:602–15.

    Not in our library10.1016/j.stem.2013.03.002

  186. 186.

    Sahlgren C Gustafsson MV Jin S Poellinger L Lendahl U. Notch signaling mediates hypoxia-induced tumor cell migration and invasion. Proc Natl Acad Sci U S A (2008 ) 105:6392–7.

    Not in our library10.1073/pnas.0802047105

  187. 187.

    Duluc D Delneste Y Tan F Moles M-P Grimaud L Lenoir J Tumor-associated leukemia inhibitory factor and IL-6 skew monocyte differentiation into tumor-associated macrophage-like cells. Blood (2007 ) 110:4319–30.

    Not in our library10.1182/blood-2007-02-072587

  188. 188.

    Johnston DA Dong B Hughes CC. TNF induction of jagged-1 in endothelial cells is NFkappaB-dependent. Gene (2009 ) 435:36–44.

    Not in our library10.1016/j.gene.2009.01.003

  189. 189.

    Benedito R Roca C Sörensen I Adams S Gossler A Fruttiger M The Notch ligands Dll4 and jagged1 have opposing effects on angiogenesis. Cell (2009 ) 137:1124–35.

    Not in our library10.1016/j.cell.2009.03.025

  190. 190.

    Colotta F Allavena P Sica A Garlanda C Mantovani A. Cancer-related inflammation, the seventh hallmark of cancer: links to genetic instability. Carcinogenesis (2009 ) 30:1073–81.

    Not in our library10.1093/carcin/bgp127

  191. 191.

    McGuire MF Enderling H Wallace DI Batra J Jordan M Kumar S Formalizing an integrative, multidisciplinary cancer therapy discovery workflow. Cancer Res (2013 ) 73:6111–7.

    Not in our library10.1158/0008-5472.can-13-0310

  192. 192.

    Enderling H Hahnfeldt P Hlatky L Almog N. Systems biology of tumor dormancy: linking biology and mathematics on multiple scales to improve cancer therapy. Cancer Res (2012 ) 72:2172–5.

    Not in our library10.1158/0008-5472.can-11-3269

  193. 193.

    Marchini S Fruscio R Clivio L Beltrame L Porcu L Nerini IF Resistance to platinum-based chemotherapy is associated with epithelial to mesenchymal transition in epithelial ovarian cancer. Eur J Cancer (2012 ) 49:520–30.

    Not in our library10.1016/j.ejca.2012.06.026

  194. 194.

    Arumugam T Ramachandran V Fournier KF Wang H Marquis L Abbruzzese JL Epithelial to mesenchymal transition contributes to drug resistance in pancreatic cancer. Cancer Res (2009 ) 69:5820–8.

    Not in our library10.1158/0008-5472.can-08-2819

  195. 195.

    Witta SE Gemmill RM Hirsch FR Coldren CD Hedman K Ravdel L Restoring E-cadherin expression increases sensitivity to epidermal growth factor receptor inhibitors in lung cancer cell lines. Cancer Res (2006 ) 66:944–50.

    Not in our library10.1158/0008-5472.can-05-1988

  196. 196.

    May CD Sphyris N Evans KW Werden SJ Guo W Mani SA. Epithelial-mesenchymal transition and cancer stem cells: a dangerously dynamic duo in breast cancer progression. Breast Cancer Res (2011 ) 13:202.

    Not in our library10.1186/bcr2789

  197. 197.

    André F Zielinski CC. Optimal strategies for the treatment of metastatic triple-negative breast cancer with currently approved agents. Ann Oncol (2012 ) 23:vi46–51.

    Not in our library10.1093/annonc/mds195

  198. 198.

    Vadgama JV Wu Y Ginther C Kim J Mosher N Chung S Expression of Wnt3 activates Wnt/β-catenin pathway and promotes EMT-like phenotype in trastuzumab resistant HER2-overexpressing breast cancer cells. Mol Cancer Res (2012 ) 10:1597–606.

    Not in our library10.1158/1541-7786.mcr-12-0155-t

  199. 199.

    Hiscox S Jiang WG Obermeier K Taylor K Morgan L Burmi R Tamoxifen resistance in MCF7 cells promotes EMT-like behaviour and involves modulation of β-catenin phosphorylation. Int J Cancer (2006 ) 118:290–301.

    Not in our library10.1002/ijc.21355

  200. 200.

    Bastos LGDR de Marcondes PG de-Freitas-Junior JC Leve F Mencalha AL de Souza WF Progeny from irradiated colorectal cancer cells acquire an EMT-like phenotype and activate Wnt/β-catenin pathway. J Cell Biochem (2014 ) 115:2175–87.

    Not in our library10.1002/jcb.24896

  201. 201.

    Nieto MA Cano A. The epithelial – mesenchymal transition under control: global programs to regulate epithelial plasticity. Semin Cancer Biol (2012 ) 22:361–8.

    Not in our library10.1016/j.semcancer.2012.05.003

  202. 202.

    Dvorak H Tumors: wounds that do not heal. N Engl J Med (1986 ) 315:1650–9.

    Not in our library10.1056/nejm198612253152606

  203. 203.

    Zhu H Bhaijee F Ishaq N Pepper DJ Backus K Brown AS Correlation of Notch1, pAKT and nuclear NF-κB expression in triple negative breast cancer. Am J Cancer Res (2013 ) 3:230–9.

    Not in our library

  204. 204.

    Schaue D Micewicz ED Ratikan JA Xie MW Cheng G McBride WH Radiation and inflammation. Semin Radiat Oncol (2015 ) 25:4–10.

    Not in our library10.1016/j.semradonc.2014.07.007

  205. 205.

    Multhoff G Radons J. Radiation, inflammation, and immune responses in cancer. Front Oncol (2012 ) 2:58.

    Not in our library10.3389/fonc.2012.00058

  206. 206.

    Torres MA Pace TW Liu T Felger JC Mister D Gregory H. Predictors of ­depression in breast cancer patients treated with radiation: role of prior chemotherapy and nuclear factor kappa B. Cancer (2013 ) 119:1951–9.

    Not in our library10.1002/cncr.28003

  207. 207.

    Harless WW. Cancer treatments transform residual cancer cell phenotype. Cancer Cell Int (2011 ) 11:1.

    Not in our library10.1186/1475-2867-11-1

  208. 208.

    Wang Z Li Y Kong D Banerjee S Ahmad A Azmi AS Acquisition of epithelial-mesenchymal transition phenotype of gemcitabine-resistant pancreatic cancer cells is linked with activation of the Notch signaling pathway. Cancer Res (2009 ) 69:2400–7.

    Not in our library10.1158/0008-5472.can-08-4312

  209. 209.

    Hay ED. An overview of epithelio-mesenchymal transformation. Acta Anat (1995 ) 154:8–20.

    Not in our library10.1159/000147748

  210. 210.

    Corallino S Malabarba MG Zobel M Di Fiore PP Scita G. Epithelial-to-mesenchymal plasticity harnesses endocytic circuitries. Front Oncol (2015 ) 5:45.

    Not in our library10.3389/fonc.2015.00045

  211. 211.

    Pinto CA Widodo E Waltham M Thompson EW. Breast cancer stem cells and epithelial mesenchymal plasticity – implications for chemoresistance. Cancer Lett (2013 ) 341:56–62.

    Not in our library10.1016/j.canlet.2013.06.003

  212. 212.

    McInnes LM Jacobson N Redfern A Dowling A Thompson EW Saunders CM. Clinical implications of circulating tumor cells of breast cancer patients: role of epithelial mesenchymal plasticity. Front Oncol (2015 ) 5:42.

    Not in our library10.3389/fonc.2015.00042

  213. 213.

    Theveneau E Mayor R. Collective cell migration of epithelial and mesenchymal cells. Cell Mol Life Sci (2013 ) 70:3481–92.

    Not in our library10.1007/s00018-012-1251-7

  214. 214.

    Rogers CD Saxena A Bronner ME. Sip1 mediates an E-cadherin-to-N-cadherin switch during cranial neural crest EMT. J Cell Biol (2013 ) 203:835–47.

    Not in our library10.1083/jcb.201305050

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    Rodriguez FJ Lewis-Tuffin LJ Anastasiadis PZ. E-cadherin’s dark side: possible role in tumor progression. Biochim Biophys Acta (2012 ) 1826:23–31.

    Not in our library10.1016/j.bbcan.2012.03.002

  216. 216.

    Bednarz-Knoll N Alix-Panabières C Pantel K. Plasticity of disseminating cancer cells in patients with epithelial malignancies. Cancer Metastasis Rev (2012 ) 31:673–87.

    Not in our library10.1007/s10555-012-9370-z

  217. 217.

    Chouaib S Janji B Tittarelli A Eggermont A Thiery JP. Tumor plasticity interferes with anti-tumor immunity. Crit Rev Immunol (2014 ) 34:91–102.

    Not in our library10.1615/critrevimmunol.2014010183

  218. 218.

    Cai X Dai Z Reeves RS Caballero-Benitez A Duran KL Delrow JJ Autonomous stimulation of cancer cell plasticity by the human NKG2D lymphocyte receptor coexpressed with its ligands on cancer cells. PLoS One (2014 ) 9:e108942.

    Not in our library10.1371/journal.pone.0108942

  219. 219.

    Zuo J Ishikawa T Boutros S Xiao Z Humtsoe JO Kramer RH. Bcl-2 overexpression induces a partial epithelial to mesenchymal transition and promotes squamous carcinoma cell invasion and metastasis. Mol Cancer Res (2010 ) 8:170–82.

    Not in our library10.1158/1541-7786.mcr-09-0354

  220. 220.

    Mitra A Menezes ME Shevde LA Samant RS. DNAJB6 induces degradation of β-catenin and causes partial reversal of mesenchymal phenotype. J Biol Chem (2010 ) 285:24686–94.

    Not in our library10.1074/jbc.m109.094847

  221. 221.

    Morbini P Inghilleri S Campo I Oggionni T Zorzetto M Luisetti M. Incomplete expression of epithelial-mesenchymal transition markers in idiopathic pulmonary fibrosis. Pathol Res Pract (2011 ) 207:559–67.

    Not in our library10.1016/j.prp.2011.06.006

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    Damonte P Gregg JP Borowsky AD Keister BA Cardiff RD EMT tumorigenesis in the mouse mammary gland. Lab Invest (2007 ) 87:1218–26.

    Not in our library10.1038/labinvest.3700683

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    Umbreit C Flanjak J Weiss C Erben P Aderhold C Faber A Incomplete epithelial – mesenchymal transition in p16-positive squamous cell carcinoma cells correlates with β-catenin expression. Anticancer Res (2014 ) 34:7061–69.

    Not in our library

  224. 224.

    Zeisberg M Neilson EG Mechanisms of tubulointerstitial fibrosis. J Am Soc Nephrol (2010 ) 21:1819–34.

    Not in our library10.1681/asn.2010080793

  225. 225.

    Gopal SK Greening DW Mathias RA Ji H Rai A Chen M YBX1/YB-1 induces partial EMT and tumourigenicity through secretion of angiogenic factors into the extracellular microenvironment. Oncotarget (2015 ) 6:13718–30.

    Not in our library10.18632/oncotarget.3764

  226. 226.
  227. 227.

    Schuetz AN Rubin BP Goldblum JR Shehata B Weiss SW Liu W Intercellular junctions in Ewing sarcoma/primitive neuroectodermal tumor: additional evidence of epithelial differentiation. Mod Pathol (2005 ) 18:1403–10.

    Not in our library10.1038/modpathol.3800435

  228. 228.

    Burns WC Twigg SM Forbes JM Pete J Tikellis C Thallas-Bonke V Connective tissue growth factor plays an important role in advanced glycation end product-induced tubular epithelial-to-mesenchymal transition: implications for diabetic renal disease. J Am Soc Nephrol (2006 ) 17:2484–94.

    Not in our library10.1681/asn.2006050525

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    Voulgari A Pintzas A. Epithelial-mesenchymal transition in cancer metastasis: mechanisms, markers and strategies to overcome drug resistance in the clinic. Biochim Biophys Acta (2009 ) 1796:75–90.

    Not in our library10.1016/j.bbcan.2009.03.002

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    Sarioglu AF Aceto N Kojic N Donaldson MC Zeinali M Hamza B A microfluidic device for label-free, physical capture of circulating tumor cell clusters. Nat Methods (2015 ) 12(7):685–91.

    Not in our library10.1038/nmeth.3404

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