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Miquel M, Zhang S, Pilarsky C. Pre-clinical Models of Metastasis in Pancreatic Cancer. Front Cell Dev Biol 2021; 9:748631. [PMID: 34778259 PMCID: PMC8578999 DOI: 10.3389/fcell.2021.748631] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 09/20/2021] [Indexed: 12/12/2022] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is a hostile solid malignancy coupled with an extremely high mortality rate. Metastatic disease is already found in most patients at the time of diagnosis, resulting in a 5-year survival rate below 5%. Improved comprehension of the mechanisms leading to metastasis is pivotal for the development of new targeted therapies. A key field to be improved are modeling strategies applied in assessing cancer progression, since traditional platforms fail in recapitulating the complexity of PDAC. Consequently, there is a compelling demand for new preclinical models that mirror tumor progression incorporating the pressure of the immune system, tumor microenvironment, as well as molecular aspects of PDAC. We suggest the incorporation of 3D organoids derived from genetically engineered mouse models or patients as promising new tools capable to transform PDAC pre-clinical modeling and access new frontiers in personalized medicine.
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Affiliation(s)
- Maria Miquel
- Department of Surgery, University Hospital, Erlangen, Germany
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Shuman Zhang
- Department of Surgery, University Hospital, Erlangen, Germany
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Christian Pilarsky
- Department of Surgery, University Hospital, Erlangen, Germany
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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2
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Bien E, Roganovic J, Krawczyk MA, Godzinski J, Orbach D, Cecchetto G, Barthlen W, Defachelles AS, Ferrari A, Weldon CB, Brecht IB, Schneider DT, Bisogno G, Kolenova A, Ben-Ami T, Martinova K, Virgone C, Stachowicz-Stencel T, Kachanov D, Reguerre Y. Pancreatoblastoma in children: EXPeRT/PARTNER diagnostic and therapeutic recommendations. Pediatr Blood Cancer 2021; 68 Suppl 4:e29112. [PMID: 34174157 DOI: 10.1002/pbc.29112] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 04/20/2021] [Accepted: 04/25/2021] [Indexed: 12/17/2022]
Abstract
Pancreatoblastoma (PBL) is a rare malignant epithelial neoplasm that affects typically young children. Signs related to advanced upper-abdominal tumor accompanied by elevated serum α-fetoprotein levels in a young child suggest PBL, however histopathological confirmation is mandatory. The mainstay of the treatment is a complete surgical resection. Unresectable and/or metastatic PBL may become amenable to complete delayed surgery after neoadjuvant chemotherapy. This manuscript presents the international consensus recommendations for the diagnosis and treatment of children with PBL, established by the European Cooperative Study Group for Pediatric Rare Tumors (EXPeRT) within the EU-funded PARTNER (Paediatric Rare Tumors Network - European Registry) project.
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Affiliation(s)
- Ewa Bien
- Department of Pediatrics, Hematology and Oncology, Medical University of Gdansk, Gdansk, Poland
| | - Jelena Roganovic
- Department of Pediatrics, Clinical Hospital Center Rijeka, University of Rijeka, Rijeka, Croatia
| | - Malgorzata A Krawczyk
- Department of Pediatrics, Hematology and Oncology, Medical University of Gdansk, Gdansk, Poland
| | - Jan Godzinski
- Department of Pediatric Surgery, Marciniak Hospital, Wroclaw, Poland.,Department of Pediatric Traumatology and Emergency Medicine, Wroclaw Medical University, Wroclaw, Poland
| | - Daniel Orbach
- SIREDO Oncology Center (Care, Innovation and Research for Children and AYA with Cancer), PSL Research University, Institut Curie, Paris, France
| | - Giovanni Cecchetto
- Pediatric Surgery, Department of Women's and Children's Health, University of Padua, Padua, Italy
| | - Winfred Barthlen
- Pediatric Surgery, Universitaetsmedizin Greifswald, Greifswald, Germany
| | | | - Andrea Ferrari
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Christopher B Weldon
- Departments of Surgery, Oncology and Anesthesiology, Boston Children's Hospital, Dana-Farber Cancer Institute, Harvard University, Boston, Massachusetts, USA
| | - Ines B Brecht
- Pediatric Hematology and Oncology, Children's Hospital, Eberhard-Karls-Universitaet Tübingen, Tübingen, Germany
| | | | - Gianni Bisogno
- Hematology-Oncology Division, Department of Pediatrics, Padova University Hospital, Padua, Italy
| | | | - Tal Ben-Ami
- Pediatric Hematology Unit, Kaplan Medical Center, Rehovot, Israel
| | - Kata Martinova
- Department of Hematology and Oncology, University Clinic for Children`s Diseases, Medical Faculty, Ss Cyril and Methodius University of Skopje, Skopje, Republic of North Macedonia
| | - Calogero Virgone
- Pediatric Surgery, Department of Women's and Children's Health, University of Padua, Padua, Italy
| | | | - Denis Kachanov
- Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russia
| | - Yves Reguerre
- Department of Pediatric Hematology and Oncology, Félix Guyon University Hospital, St Denis, Réunion Island, France
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Ayres Pereira M, Chio IIC. Metastasis in Pancreatic Ductal Adenocarcinoma: Current Standing and Methodologies. Genes (Basel) 2019; 11:E6. [PMID: 31861620 PMCID: PMC7016631 DOI: 10.3390/genes11010006] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 12/11/2019] [Accepted: 12/17/2019] [Indexed: 01/18/2023] Open
Abstract
Pancreatic ductal adenocarcinoma is an extremely aggressive disease with a high metastatic potential. Most patients are diagnosed with metastatic disease, at which the five-year survival rate is only 3%. A better understanding of the mechanisms that drive metastasis is imperative for the development of better therapeutic interventions. Here, we take the reader through our current knowledge of the parameters that support metastatic progression in pancreatic ductal adenocarcinoma, and the experimental models that are at our disposal to study this process. We also describe the advantages and limitations of these models to study the different aspects of metastatic dissemination.
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Affiliation(s)
| | - Iok In Christine Chio
- Institute for Cancer Genetics, Department of Genetics and Development, Columbia University Medical Center, New York, NY 10032, USA;
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Clinicopathological features and surgical outcomes of resected functional pancreatic neuroendocrine tumors: a single institution experience. JOURNAL OF PANCREATOLOGY 2019. [DOI: 10.1097/jp9.0000000000000018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Misra S, Saran RK, Srivastava S, Barman S, Dahale A. Utility of cytomorphology in distinguishing solid pseudopapillary neoplasm of pancreas from pancreatic neuroendocrine tumor with emphasis on nuclear folds and nuclear grooves. Diagn Cytopathol 2019; 47:531-540. [DOI: 10.1002/dc.24145] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 12/05/2018] [Accepted: 01/02/2019] [Indexed: 01/17/2023]
Affiliation(s)
- Sunayana Misra
- Department of PathologyGB Pant Institute of Post Graduate Medical Education and Research 1 Jawahar Lal Nehru Marg, New Delhi India
| | - RK Saran
- Department of PathologyGB Pant Institute of Post Graduate Medical Education and Research 1 Jawahar Lal Nehru Marg, New Delhi India
| | - Siddharth Srivastava
- Department of GastroenterologyGB Pant Institute of Post Graduate Medical Education and Research 1 Jawahar Lal Nehru Marg, New Delhi India
| | - Sandip Barman
- Department of PathologyGB Pant Institute of Post Graduate Medical Education and Research 1 Jawahar Lal Nehru Marg, New Delhi India
| | - Amol Dahale
- Department of GastroenterologyGB Pant Institute of Post Graduate Medical Education and Research 1 Jawahar Lal Nehru Marg, New Delhi India
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Intrapancreatic accessory spleen (IPAS): A single-institution experience and review of the literature. Am J Surg 2017; 213:816-820. [DOI: 10.1016/j.amjsurg.2016.11.030] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 11/13/2016] [Accepted: 11/21/2016] [Indexed: 11/23/2022]
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Freeny PC, Saunders MD. Moving beyond morphology: new insights into the characterization and management of cystic pancreatic lesions. Radiology 2014; 272:345-63. [PMID: 25058133 DOI: 10.1148/radiol.14131126] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The frequency of detection of cystic pancreatic lesions with cross-sectional imaging, particularly with multidetector computed tomography, magnetic resonance (MR) imaging, and MR cholangiopancreatography, is increasing, and many of these cystic pancreatic lesions are being detected incidentally in asymptomatic patients. Because there is considerable overlap in the cross-sectional imaging findings of cystic pancreatic lesions, and because many of these lesions being detected are smaller than 3 cm in diameter and lack any specific cross-sectional imaging features, it has become difficult to make informed decisions about patient management when the precise diagnosis remains uncertain. This article presents the limitations of cross-sectional imaging in patients with cystic pancreatic lesions, details advances in knowledge of the genomic and epigenomic changes that lead to progression of carcinogenesis, outlines the current understanding of the natural history of mucinous cystic lesions, and includes the current use and future potential of novel tumor markers and molecular analysis to characterize cystic pancreatic lesions more precisely. The need to move beyond cross-sectional imaging morphology and toward the use of new techniques to diagnose these lesions accurately is emphasized. An algorithm that uses these techniques is proposed and will hopefully lead to improved patient management.
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Affiliation(s)
- Patrick C Freeny
- From the Department of Radiology (P.C.F.) and Department of Medicine, Division of Gastroenterology (M.D.S.), University of Washington School of Medicine, 1959 NE Pacific St, Seattle, WA 98195
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Ro C, Chai W, Yu VE, Yu R. Pancreatic neuroendocrine tumors: biology, diagnosis,and treatment. CHINESE JOURNAL OF CANCER 2012; 32:312-24. [PMID: 23237225 PMCID: PMC3845620 DOI: 10.5732/cjc.012.10295] [Citation(s) in RCA: 100] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Pancreatic neuroendocrine tumors (PNETs), a group of endocrine tumors arising in the pancreas, are among the most common neuroendocrine tumors. The genetic causes of familial and sporadic PNETs are somewhat understood, but their molecular pathogenesis remains unknown. Most PNETs are indolent but have malignant potential. The biological behavior of an individual PNET is unpredictable; higher tumor grade, lymph node and liver metastasis, and larger tumor size generally indicate a less favorable prognosis. Endocrine testing, imaging, and histological evidence are necessary to accurately diagnose PNETs. A 4-pronged aggressive treatment approach consisting of surgery, locoregional therapy, systemic therapy, and complication control has become popular in academic centers around the world. The optimal application of the multiple systemic therapeutic modalities is under development; efficacy, safety, availability, and cost should be considered when treating a specific patient. The clinical presentation, diagnosis, and treatment of specific types of PNETs and familial PNET syndromes, including the novel Mahvash disease, are summarized.
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Affiliation(s)
- Cynthia Ro
- Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA.
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Giovinazzo F, Turri G, Zanini S, Butturini G, Scarpa A, Bassi C. Clinical implications of biological markers in Pancreatic Ductal Adenocarcinoma. Surg Oncol 2012; 21:e171-82. [PMID: 22981281 DOI: 10.1016/j.suronc.2012.07.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Revised: 07/17/2012] [Accepted: 07/26/2012] [Indexed: 12/29/2022]
Abstract
Pancreatic Ductal Adenocarcinoma (PDAC) is a malignant neoplasm and is the fourth leading cause of cancer-related deaths in US with a 5-year survival rate less than 5%. Surgery is the only potentially curative treatment even though the result is a palliation in the majority of cases and the majority of lesions are lately diagnosed. Progression from normal pancreatic epithelium to metastatic disease is now a well-characterized sequence of events. Research has shown that pancreatic cancer is fundamentally a genetic disease with several biological pathway implied in apoptosis, cell proliferation and self-sufficiency in growth signaling, but how those findings could be applied in daily clinical practice remain unknown. Several studies tried to characterize diagnostic and prognostic biomarkers in PDAC to make it possible an earlier diagnosis, guarantee a more effective treatment and reach a better prognosis even though the results remain contrasting. The main limit of the published researches is the small number of patients studied, but even the heterogeneity of the used methods of analysis. Examining critically the research of the last years future trials may be addressed toward a translational models integrating "the bench and the bed" with the clinical experience and drive the basic research toward the clinical applications.
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Affiliation(s)
- Francesco Giovinazzo
- Laboratory of Translational Surgery, University Laboratories of Medical Research (LURM), G.B. Rossi Hospital, University of Verona, Piazzale L.A. Scuro 10, Verona 37134, Italy
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Corbo V, Beghelli S, Bersani S, Antonello D, Talamini G, Brunelli M, Capelli P, Falconi M, Scarpa A. Pancreatic endocrine tumours: mutational and immunohistochemical survey of protein kinases reveals alterations in targetable kinases in cancer cell lines and rare primaries. Ann Oncol 2012; 23:127-134. [PMID: 21447618 PMCID: PMC3276319 DOI: 10.1093/annonc/mdr048] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Revised: 01/27/2011] [Accepted: 01/31/2011] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Kinases represent potential therapeutic targets in pancreatic endocrine tumours (PETs). PATIENTS AND METHODS Thirty-five kinase genes were sequenced in 36 primary PETs and three PET cell lines: (i) 4 receptor tyrosine kinases (RTK), epithelial growth factor receptor (EGFR), human epidermal growth factor receptor 2 (HER2), tyrosine-protein kinase KIT (KIT), platelet-derived growth factor receptor alpha (PDGFRalpha); (ii) 6 belonging to the Akt/mTOR pathway; and (iii) 25 frequently mutated in cancers. The immunohistochemical expression of the four RTKs and the copy number of EGFR and HER2 were assessed in 140 PETs. RESULTS Somatic mutations were found in KIT in one and ATM in two primary neoplasms. Among 140 PETs, EGFR was immunopositive in 18 (13%), HER2 in 3 (2%), KIT in 16 (11%), and PDGFRalpha in 135 (96%). HER2 amplification was found in 2/130 (1.5%) PETs. KIT membrane immunostaining was significantly associated with tumour aggressiveness and shorter patient survival. PET cell lines QGP1, CM and BON harboured mutations in FGFR3, FLT1/VEGFR1 and PIK3CA, respectively. CONCLUSIONS Only rare PET cases, harbouring either HER2 amplification or KIT mutation, might benefit from targeted drugs. KIT membrane expression deserves further attention as a prognostic marker. ATM mutation is involved in a proportion of PET. The finding of specific mutations in PET cell lines renders these models useful for preclinical studies involving pathway-specific therapies.
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Affiliation(s)
- V Corbo
- ARC-NET Center for the Applied Research on Cancer-Networking
| | - S Beghelli
- ARC-NET Center for the Applied Research on Cancer-Networking
| | - S Bersani
- Department of Pathology and Diagnostics
| | - D Antonello
- Department of Surgery and Oncology, University and Hospital Trust of Verona, Verona, Italy
| | - G Talamini
- Department of Surgery and Oncology, University and Hospital Trust of Verona, Verona, Italy
| | | | - P Capelli
- Department of Pathology and Diagnostics
| | - M Falconi
- Department of Surgery and Oncology, University and Hospital Trust of Verona, Verona, Italy
| | - A Scarpa
- ARC-NET Center for the Applied Research on Cancer-Networking; Department of Pathology and Diagnostics.
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Arnason T, Sapp HL, Rayson D, Barnes PJ, Drewniak M, Nassar BA, Huang WY. Loss of Expression of DNA Mismatch Repair Proteins Is Rare in Pancreatic and Small Intestinal Neuroendocrine Tumors. Arch Pathol Lab Med 2011; 135:1539-44. [DOI: 10.5858/arpa.2010-0560-oa] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Context.—Two recent studies have identified a high rate of microsatellite instability (MSI) in pancreatic neuroendocrine tumors (pNETs). Microsatellite instability is rare in small intestinal neuroendocrine tumors (NETs). It is unclear why there is discordance in the frequency of MSI in the 2 studies of pNETs and why this mechanism is comparatively rare in small intestinal tumors. Loss of expression of DNA mismatch repair (MMR) proteins, which is known to correlate strongly with MSI, is not well studied in pancreatic or small intestinal NETs.
Objective.—To determine if there is loss of expression of MMR protein expression in pancreatic or small intestinal NETs.
Design.—Sixty-nine patients (31 male, 38 female; mean age, 59.2 years) were identified who had a resection for a primary pancreatic (n = 35) or primary small intestinal (n = 34) NET during an 18-year period. Immunohistochemical stains for MLH1, MSH2, MSH6, and PMS2 were applied to archived tissue from all cases. All pNETs with adequate tissue (n = 32) were also assessed by MSI analysis.
Results.—There was preserved expression of MLH1, MSH2, MSH6, and PMS2 in all 35 pNETs. Of 32 pNETs tested by polymerase chain reaction, 28 were microsatellite stable and DNA did not amplify in 4. In 34 small intestinal NETs, 2 cases had indeterminate MLH1 and 1 case had indeterminate PMS2 expression. The remainder had intact MMR protein expression.
Conclusion.—Defects in DNA MMR proteins are rare in pancreatic and small intestinal NETs, raising doubt that MSI plays a significant role in the pathogenesis of these tumors.
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Yu R, Dhall D, Nissen NN, Zhou C, Ren SG. Pancreatic neuroendocrine tumors in glucagon receptor-deficient mice. PLoS One 2011; 6:e23397. [PMID: 21853126 PMCID: PMC3154424 DOI: 10.1371/journal.pone.0023397] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Accepted: 07/14/2011] [Indexed: 02/06/2023] Open
Abstract
Inhibition of glucagon signaling causes hyperglucagonemia and pancreatic α cell hyperplasia in mice. We have recently demonstrated that a patient with an inactivating glucagon receptor mutation (P86S) also exhibits hyperglucagonemia and pancreatic α cell hyperplasia but further develops pancreatic neuroendocrine tumors (PNETs). To test the hypothesis that defective glucagon signaling causes PNETs, we studied the pancreata of mice deficient in glucagon receptor (Gcgr−/−) from 2 to 12 months, using WT and heterozygous mice as controls. At 2–3 months, Gcgr−/− mice exhibited normal islet morphology but the islets were mostly composed of α cells. At 5–7 months, dysplastic islets were evident in Gcgr−/− mice but absent in WT or heterozygous controls. At 10–12 months, gross PNETs (≥1 mm) were detected in most Gcgr−/− pancreata and micro-PNETs (<1 mm) were found in all (n = 14), whereas the islet morphology remained normal and no PNETs were found in any WT (n = 10) or heterozygous (n = 25) pancreata. Most PNETs in Gcgr−/− mice were glucagonomas, but some were non-functioning. No tumors predominantly expressed insulin, pancreatic polypeptide, or somatostatin, although some harbored focal aggregates of tumor cells expressing one of those hormones. The PNETs in Gcgr−/− mice were well differentiated and occasionally metastasized to the liver. Menin expression was aberrant in most dysplatic islets and PNETs. Vascular endothelial growth factor (VEGF) was overexpressed in PNET cells and its receptor Flk-1 was found in the abundant blood vessels or blood islands inside the tumors. We conclude that defective glucagon signaling causes PNETs in the Gcgr−/− mice, which may be used as a model of human PNETs. Our results further suggest that completely inhibiting glucagon signaling may not be a safe approach to treat diabetes.
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Affiliation(s)
- Run Yu
- Division of Endocrinology, Cedars-Sinai Medical Center, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America.
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Abstract
Verbeke C S (2010) Histopathology 56, 669-682 Endocrine tumours of the pancreas Histopathology reporting of pancreatic endocrine neoplasms is complex. The tumours can exhibit a variety of morphological appearances, which often require careful differential diagnostic consideration. Prediction of tumour behaviour and clinical outcome is based on the World Health Organization classification and TNM staging and grading system, which share some criteria and premises, but differ significantly in others. Clinicopathological correlation through discussion at multidisciplinary team meetings is of paramount importance. In this review special emphasis is given to the items of information that can and should be provided by the pathologist to allow optimal patient management. The review further discusses areas of current controversy and uncertainty, of which pathologists participating in multidisciplinary discussions should be aware.
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Layton T, Stalens C, Gunderson F, Goodison S, Silletti S. Syk tyrosine kinase acts as a pancreatic adenocarcinoma tumor suppressor by regulating cellular growth and invasion. THE AMERICAN JOURNAL OF PATHOLOGY 2009; 175:2625-36. [PMID: 19893036 DOI: 10.2353/ajpath.2009.090543] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We have identified the nonreceptor tyrosine kinase syk as a marker of differentiation/tumor suppressor in pancreatic ductal adenocarcinoma (PDAC). Syk expression is lost in poorly differentiated PDAC cells in vitro and in situ, and stable reexpression of syk in endogenously syk-negative Panc1 (Panc1/syk) cells retarded their growth in vitro and in vivo and reduced anchorage-independent growth in vitro. Panc1/syk cells exhibited a more differentiated morphology and down-regulated cyclin D1, akt, and CD171, which are overexpressed by Panc1 cells. Loss of PDAC syk expression in culture is due to promoter methylation, and reversal of promoter methylation caused reexpression of syk and concomitant down-regulation of CD171. Moreover, suppression of syk expression in BxPC3 cells caused de novo CD171 expression, consistent with the reciprocal expression of syk and CD171 we observe in situ. Importantly, Panc1/syk cells demonstrated dramatically reduced invasion in vitro. Affymetrix analysis identified statistically significant regulation of >2000 gene products by syk in Panc1 cells. Of these, matrix metalloproteinase-2 (MMP2) and tissue inhibitor of metalloproteinase-2 were down-regulated, suggesting that the MMP2 axis might mediate Panc1/mock invasion. Accordingly, MMP2 inhibition suppressed the in vitro invasion of Panc1/mock cells without effect on Panc1/syk cells. This study demonstrates a prominent role for syk in regulating the differentiation state and invasive phenotype of PDAC cells.
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Affiliation(s)
- Tracy Layton
- Moores Cancer Center, University of California, San Diego, La Jolla, California 92093-0803, USA
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