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      Prognostic value of diffuse splenic FDG uptake on PET/CT in patients with gastric cancer

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          Abstract

          Background

          This study investigated the prognostic value of diffuse splenic uptake on F-18 fluorodeoxyglucose (FDG) positron emission tomography (PET)/computed tomography (CT) in gastric cancer (GC) patients.

          Methods

          A total of 134 pathology confirmed GC patients who underwent PET/CT for staging work-ups were enrolled. The maximal standardized uptake value (SUV max ) of primary tumor (T max ), spleen (S max ), and spleen to liver uptake ratio (SLR) were measured. The prognostic value of PET-measured parameters in GC patients for predicting recurrence-free survival (RFS) and overall survival (OS) were assessed. And the relationships of the parameters with hematological and inflammatory parameters were also investigated.

          Results

          During follow-up period, 19 patients (14.1%) had disease recurrence and 12 (8.9%) died from GC. In univariate analysis, hematocrit ( p<0.001 and p = 0.002), neutrophil to lymphocyte ratio (NLR; p = 0.021 and p = 0.040), AJCC staging ( p<0.001 and p<0.001), adjuvant chemotherapy ( p<0.001 and p<0.001), T max ( p = 0.004 and p = 0.005), and SLR ( p = 0.005 and p = 0.016) were significant prognostic factors for RFS and OS, whereas platelet to lymphocyte ratio (PLR; p = 0.034) was a significant prognostic factor for RFS. In multivariate analysis, only SLR was an independent prognostic factor for RFS ( p = 0.018, adjusted HR = 3.011, 95% CI = 1.207–7.511). SLR were significantly associated with serum hematocrit level ( r = -0.256, p = 0.002), PLR ( r = 0.362, p = 0.001), and T max ( r = 0.280, p = 0.001).

          Conclusion

          Diffuse splenic uptake on FDG PET/CT was correlated with the level of hematological and inflammatory parameters and was an independent predictor for RFS in GC.

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          Most cited references18

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          Inflammation-associated cancer development in digestive organs: mechanisms and roles for genetic and epigenetic modulation.

          Chronic inflammation, regardless of infectious agents, plays important roles in the development of various cancers, particularly in digestive organs, including Helicobacter pylori-associated gastric cancer, hepatitis C virus-positive hepatocellular carcinoma, and colitis-associated colon cancers. Cancer development is characterized by stepwise accumulation of genetic and epigenetic alterations of various proto-oncogenes and tumor-suppressor genes. During chronic inflammation, infectious agents such as H pylori and hepatitis C virus as well as intrinsic mediators of inflammatory responses, including proinflammatory cytokines and reactive oxygen and nitrogen species, can induce genetic and epigenetic changes, including point mutations, deletions, duplications, recombinations, and methylation of various tumor-related genes through various mechanisms. Furthermore, inflammation also modulates the expressions of microRNAs that influence the production of several tumor-related messenger RNAs or proteins. These molecular events induced by chronic inflammation work in concert to alter important pathways involved in normal cellular function, and hence accelerate inflammation-associated cancer development. Among these, recent studies highlighted an important role of activation-induced cytidine deaminase, a nucleotide-editing enzyme essential for somatic hypermutation and class-switch recombination of the immunoglobulin gene, as a genomic modulator in inflammation-associated cancer development. Copyright © 2012 AGA Institute. Published by Elsevier Inc. All rights reserved.
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            Homeostatic and pathogenic extramedullary hematopoiesis

            Extramedullary hematopoiesis (EH) is defined as hematopoiesis occurring in organs outside of the bone marrow; it occurs in diverse conditions, including fetal development, normal immune responses, and pathological circumstances. During fetal development, before formation of mature marrow, EH occurs in the yolk sac, fetal liver, and spleen. EH also occurs during active immune responses to pathogens. Most frequently, this response occurs in the spleen and liver for the production of antigen-presenting cells and phagocytes. EH also occurs when the marrow becomes inhabitable for stem and progenitor cells in certain pathological conditions, including myelofibrosis, where marrow cells are replaced with collagenous connective tissue fibers. Thus, EH occurs either actively or passively in response to diverse changes in the hematopoietic environment. This article reviews the key features and regulators of the major types of EH.
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              Pathohistological classification systems in gastric cancer: diagnostic relevance and prognostic value.

              Several pathohistological classification systems exist for the diagnosis of gastric cancer. Many studies have investigated the correlation between the pathohistological characteristics in gastric cancer and patient characteristics, disease specific criteria and overall outcome. It is still controversial as to which classification system imparts the most reliable information, and therefore, the choice of system may vary in clinical routine. In addition to the most common classification systems, such as the Laurén and the World Health Organization (WHO) classifications, other authors have tried to characterize and classify gastric cancer based on the microscopic morphology and in reference to the clinical outcome of the patients. In more than 50 years of systematic classification of the pathohistological characteristics of gastric cancer, there is no sole classification system that is consistently used worldwide in diagnostics and research. However, several national guidelines for the treatment of gastric cancer refer to the Laurén or the WHO classifications regarding therapeutic decision-making, which underlines the importance of a reliable classification system for gastric cancer. The latest results from gastric cancer studies indicate that it might be useful to integrate DNA- and RNA-based features of gastric cancer into the classification systems to establish prognostic relevance. This article reviews the diagnostic relevance and the prognostic value of different pathohistological classification systems in gastric cancer.
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                Author and article information

                Contributors
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: ResourcesRole: SoftwareRole: ValidationRole: VisualizationRole: Writing – original draft
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SupervisionRole: Writing – review & editing
                Role: ConceptualizationRole: Data curationRole: Funding acquisitionRole: InvestigationRole: Project administrationRole: ResourcesRole: SupervisionRole: Writing – review & editing
                Role: Data curationRole: Formal analysisRole: MethodologyRole: ResourcesRole: Software
                Role: Data curationRole: Formal analysisRole: MethodologyRole: ResourcesRole: Software
                Role: InvestigationRole: MethodologyRole: ResourcesRole: SoftwareRole: Validation
                Role: Editor
                Journal
                PLoS One
                PLoS ONE
                plos
                plosone
                PLoS ONE
                Public Library of Science (San Francisco, CA USA )
                1932-6203
                26 April 2018
                2018
                : 13
                : 4
                : e0196110
                Affiliations
                [1 ] Department of Nuclear Medicine, College of Medicine, Ewha Womans University, Seoul, Republic of Korea
                [2 ] Department of Internal Medicine, College of Medicine, Ewha Womans University, Seoul, Republic of Korea
                [3 ] Tissue Injury Defense Research Center, Ewha Womans University, Seoul, Republic of Korea
                [4 ] Clinical Research Institute, College of Medicine, Ewha Womans University, Seoul, Republic of Korea
                National Cancer Center, JAPAN
                Author notes

                Competing Interests: The authors have declared that no competing interests exist.

                Author information
                http://orcid.org/0000-0003-2520-7182
                Article
                PONE-D-18-00634
                10.1371/journal.pone.0196110
                5919642
                29698422
                9dd33579-410d-4984-a2a9-1fac17e2c2af
                © 2018 Yoon et al

                This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                History
                : 8 January 2018
                : 8 April 2018
                Page count
                Figures: 3, Tables: 3, Pages: 11
                Funding
                Funded by: funder-id http://dx.doi.org/10.13039/501100003725, National Research Foundation of Korea;
                Award ID: 2010-0027945
                Award Recipient :
                Funded by: funder-id http://dx.doi.org/10.13039/501100003725, National Research Foundation of Korea;
                Award ID: 2015R1C1A2A01054113
                Award Recipient :
                Funded by: funder-id http://dx.doi.org/10.13039/501100003725, National Research Foundation of Korea;
                Award ID: 2015R1C1A1A02037051
                Award Recipient :
                Funded by: funder-id http://dx.doi.org/10.13039/501100003725, National Research Foundation of Korea;
                Award ID: 2017R1D1A1B03035311
                Award Recipient :
                This work was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Education (grant number, NRF-2015R1C1A2A01054113: Hai-Jeon Yoon & grant number, NRF-2017R1D1A1B03035311: Chang Mo Moon) and by the NRF grant funded by the Ministry of Science and ICT (grant number, NRF- 2015R1C1A1A02037051: Bom Sahn Kim & grant number, 2010-0027945: Chang Mo Moon).
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