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https://www.readbyqxmd.com/read/28814884/outcomes-of-adding-induction-chemotherapy-to-concurrent-chemoradiotherapy-for-stage-t3n0-1-nasopharyngeal-carcinoma-a-propensity-matched-study
#1
Xiao-Wen Lan, Yao Xiao, Xue-Bin Zou, Xiao-Min Zhang, Pu-Yun OuYang, Fang-Yun Xie
OBJECTIVE: Our objective was to examine whether adding induction chemotherapy to concurrent chemoradiotherapy improved survival in stage III nasopharyngeal carcinoma (NPC) patients, especially in low-risk patients at stage T3N0-1. MATERIALS AND METHODS: We retrospectively analyzed 687 patients with stage T3N0-1 NPC treated with intensity-modulated radiation therapy (IMRT) plus concurrent chemotherapy (CC) with or without induction chemotherapy (IC). Propensity score matching (PSM) method was used to select 237 pairs of patients from two cohorts...
2017: OncoTargets and Therapy
https://www.readbyqxmd.com/read/28801683/regulation-of-tumour-related-genes-by-dynamic-epigenetic-alteration-at-enhancer-regions-in-gastric-epithelial-cells-infected-by-epstein-barr-virus
#2
Atsushi Okabe, Sayaka Funata, Keisuke Matsusaka, Hiroe Namba, Masaki Fukuyo, Bahityar Rahmutulla, Motohiko Oshima, Atsushi Iwama, Masashi Fukayama, Atsushi Kaneda
Epstein-Barr virus (EBV) infection is associated with tumours such as Burkitt lymphoma, nasopharyngeal carcinoma, and gastric cancer. We previously showed that EBV(+) gastric cancer presents an extremely high-methylation epigenotype and this aberrant DNA methylation causes silencing of multiple tumour suppressor genes. However, the mechanisms that drive EBV infection-mediated tumorigenesis, including other epigenomic alteration, remain unclear. We analysed epigenetic alterations induced by EBV infection especially at enhancer regions, to elucidate their contribution to tumorigenesis...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800008/epstein-barr-virus-infection-can-be-a-secondary-event-in-b-cell-lymphomas-a-review-of-338-cases-and-a-novel-finding-of-zonal-eber-tumor-cells-showing-features-of-progression-from-underlying-ebv-negative-lymphoma
#3
Ira J Miller
Cases of B-cell lymphoma over an 8-year interval with diagnosis of EBER positivity were retrieved from archives and reviewed for classification and pattern of Epstein Barr Virus (EBV) expression. Of 46 cases that were EBV early RNA (EBER)+ by in situ hybridization staining, 7 had nonuniform staining among the neoplastic cells. Four of those cases showed a uniform admixture of EBER+ and EBER- tumor cells, compatible with the prevailing theory of episomal EBV loss with cell replication. Three cases of lymphomas showed a partial and zonal pattern and other features suggest that EBV infection occurred after the lymphoma was already established...
August 9, 2017: Applied Immunohistochemistry & Molecular Morphology: AIMM
https://www.readbyqxmd.com/read/28794029/coordinate-regulation-of-tet2-and-ebna2-control-dna-methylation-state-of-latent-epstein-barr-virus
#4
Fang Lu, Andreas Wiedmer, Kayla A Martin, Priyankara J M S Wickramasinghe, Andrew V Kossenkov, Paul M Lieberman
Epstein-Barr Virus (EBV) latency and its associated carcinogenesis are regulated by dynamic changes in DNA methylation of both virus and host genomes. We show here that the Ten-Eleven Translocation 2 (TET2) gene, implicated in hydroxymethylation and active DNA demethylation, is a key regulator of EBV latency type DNA methylation patterning. EBV latency types are defined by DNA methylation patterns that restrict expression of viral latency genes. We show that TET2 mRNA and protein expression correlate with the highly demethylated EBV type III latency program permissive for expression of EBNA2, EBNA3s, and LMP transcripts...
August 9, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28794023/tumor-suppressor-p53-stimulates-the-expression-of-epstein-barr-virus-latent-membrane-protein-1
#5
Qianli Wang, Amy Lingel, Vicki Geiser, Zachary Kwapnoski, Luwen Zhang
Epstein-Barr virus (EBV) is associated with multiple human malignancies. EBV latent membrane protein 1 (LMP1) is required for the efficient transformation of primary B lymphocytes in vitro and possibly in vivo The tumor suppressor p53 plays a seminal role in cancer development. In some EBV-associated cancers, p53 tends to be wild-type and overly expressed, however, the effects of p53 on LMP1 expression is not clear. We find LMP1 expression is associated with p53 expression in EBV-transformed cells under physiological and DNA damaging conditions...
August 9, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28792880/analysis-of-plasma-epstein-barr-virus-dna-to-screen-for-nasopharyngeal-cancer
#6
K C Allen Chan, John K S Woo, Ann King, Benny C Y Zee, W K Jacky Lam, Stephen L Chan, Sam W I Chu, Constance Mak, Irene O L Tse, Samantha Y M Leung, Gloria Chan, Edwin P Hui, Brigette B Y Ma, Rossa W K Chiu, Sing-Fai Leung, Andrew C van Hasselt, Anthony T C Chan, Y M Dennis Lo
BACKGROUND: Circulating cell-free Epstein-Barr virus (EBV) DNA is a biomarker for nasopharyngeal carcinoma. We conducted a prospective study to investigate whether EBV DNA in plasma samples would be useful to screen for early nasopharyngeal carcinoma in asymptomatic persons. METHODS: We analyzed EBV DNA in plasma specimens to screen participants who did not have symptoms of nasopharyngeal carcinoma. Participants with initially positive results were retested approximately 4 weeks later, and those with persistently positive EBV DNA in plasma underwent nasal endoscopic examination and magnetic resonance imaging (MRI)...
August 10, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28792435/regulation-of-telomere-homeostasis-during-epstein-barr-virus-infection-and-immortalization
#7
REVIEW
Siamak A Kamranvar, Maria G Masucci
The acquisition of unlimited proliferative potential is dependent on the activation of mechanisms for telomere maintenance, which counteracts telomere shortening and the consequent triggering of the DNA damage response, cell cycle arrest, and apoptosis. The capacity of Epstein Barr virus (EBV) to infect B-lymphocytes in vitro and transform the infected cells into autonomously proliferating immortal cell lines underlies the association of this human gamma-herpesvirus with a broad variety of lymphoid and epithelial cell malignancies...
August 9, 2017: Viruses
https://www.readbyqxmd.com/read/28771465/ebv-epigenetically-suppresses-the-b-cell-to-plasma-cell-differentiation-pathway-while-establishing-long-term-latency
#8
Christine T Styles, Quentin Bazot, Gillian A Parker, Robert E White, Kostas Paschos, Martin J Allday
Mature human B cells infected by Epstein-Barr virus (EBV) become activated, grow, and proliferate. If the cells are infected ex vivo, they are transformed into continuously proliferating lymphoblastoid cell lines (LCLs) that carry EBV DNA as extra-chromosomal episomes, express 9 latency-associated EBV proteins, and phenotypically resemble antigen-activated B-blasts. In vivo similar B-blasts can differentiate to become memory B cells (MBC), in which EBV persistence is established. Three related latency-associated viral proteins EBNA3A, EBNA3B, and EBNA3C are transcription factors that regulate a multitude of cellular genes...
August 2017: PLoS Biology
https://www.readbyqxmd.com/read/28766908/building-essential-biodiversity-variables-ebvs-of-species-distribution-and-abundance-at-a-global-scale
#9
W Daniel Kissling, Jorge A Ahumada, Anne Bowser, Miguel Fernandez, Néstor Fernández, Enrique Alonso García, Robert P Guralnick, Nick J B Isaac, Steve Kelling, Wouter Los, Louise McRae, Jean-Baptiste Mihoub, Matthias Obst, Monica Santamaria, Andrew K Skidmore, Kristen J Williams, Donat Agosti, Daniel Amariles, Christos Arvanitidis, Lucy Bastin, Francesca De Leo, Willi Egloff, Jane Elith, Donald Hobern, David Martin, Henrique M Pereira, Graziano Pesole, Johannes Peterseil, Hannu Saarenmaa, Dmitry Schigel, Dirk S Schmeller, Nicola Segata, Eren Turak, Paul F Uhlir, Brian Wee, Alex R Hardisty
Much biodiversity data is collected worldwide, but it remains challenging to assemble the scattered knowledge for assessing biodiversity status and trends. The concept of Essential Biodiversity Variables (EBVs) was introduced to structure biodiversity monitoring globally, and to harmonize and standardize biodiversity data from disparate sources to capture a minimum set of critical variables required to study, report and manage biodiversity change. Here, we assess the challenges of a 'Big Data' approach to building global EBV data products across taxa and spatiotemporal scales, focusing on species distribution and abundance...
August 2, 2017: Biological Reviews of the Cambridge Philosophical Society
https://www.readbyqxmd.com/read/28758620/antibodies-against-the-mono-methylated-arginine-glycine-repeat-mma-rg-of-the-epstein-barr-virus-nuclear-antigen-2-ebna2-identify-potential-cellular-proteins-targeted-in-viral-transformation
#10
Hiresh Ayoubian, Thomas Fröhlich, Dagmar Pogodski, Andrew Flatley, Elisabeth Kremmer, Aloys Schepers, Regina Feederle, Georg J Arnold, Friedrich A Grässer
The Epstein-Barr virus is a human herpes virus with oncogenic potential. The virus-encoded nuclear antigen 2 (EBNA2) is a key mediator of viral tumorigenesis. EBNA2 features an arginine-glycine (RG) repeat at amino acids (aa)339-354 that is essential for the transformation of lymphocytes and contains symmetrically (SDMA) and asymmetrically (ADMA) di-methylated arginine residues. The SDMA-modified EBNA2 binds the survival motor neuron protein (SMN), thus mimicking SMD3, a cellular SDMA-containing protein that interacts with SMN...
July 28, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28757548/the-role-of-epigenetic-regulation-in-epstein-barr-virus-associated-gastric-cancer
#11
REVIEW
Jun Nishikawa, Hisashi Iizasa, Hironori Yoshiyama, Munetaka Nakamura, Mari Saito, Sho Sasaki, Kanami Shimokuri, Masashi Yanagihara, Kouhei Sakai, Yutaka Suehiro, Takahiro Yamasaki, Isao Sakaida
The Epstein-Barr virus (EBV) is detected in about 10% of gastric carcinoma cases throughout the world. In EBV-associated gastric carcinoma (EBVaGC), all tumor cells harbor the clonal EBV genome. The expression of latent EBV genes is strictly regulated through the methylation of EBV DNA. The methylation of viral DNA regulates the type of EBV latency, and methylation of the tumor suppressor genes is a key abnormality in EBVaGC. The methylation frequencies of several tumor suppressor genes and cell adhesion molecules are significantly higher in EBVaGC than in control cases...
July 25, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28754665/multiparametric-detection-of-antibodies-against-different-ebv-antigens-to-predict-risk-for-nasopharyngeal-carcinoma-in-a-high-risk-population-of-china
#12
Hao Chen, Shulin Chen, Jie Lu, Xueping Wang, Jianpei Li, Linfang Li, Jihuan Fu, Thomas Scheper, Wolfgang Meyer, Yu-Hui Peng, Wanli Liu
In this study, we aimed to use the combined detection of multiple antibodies against EBV antigens to develop a model for screening and diagnosis of nasopharyngeal carcinoma (NPC). Samples of 300 NPC patients and 494 controls including 294 healthy subjects (HC), 99 non-NPC cancer patients (NNPC) and 101 patients with benign nasopharyngeal lesions (BNL) were incubated with the EUROLINE Anti-EBV Profile 2, and band intensities were used to establish a risk prediction model. The NPC risk probability analysis based on the panel of VCAgp125 IgA, EBNA-1 IgA, EA-D IgA, EBNA-1 IgG, EAD IgG and VCAp19 IgG displayed the best performance...
July 28, 2017: Cancer Prevention Research
https://www.readbyqxmd.com/read/28754096/successful-treatment-with-anti-programmed-death-1-antibody-in-a-relapsed-natural-killer-t-cell-lymphoma-patient-with-multi-line-resistance-a-case-report
#13
Jianping Lai, Peng Xu, Xiaoliu Jiang, Shan Zhou, Anwen Liu
BACKGROUND: Extranodal natural killer/T-cell lymphoma (NKTCL), nasal type, is an aggressive malignancy with poor prognosis. Currently, there is no recommended standard therapy for relapsed NKTCL. CASE PRESENTATION: A 37-year-old woman with lymphadenopathy was diagnosed with NKTCL by biopsy of an enlarged lymph node on the right side of her neck. Enhanced computed tomography revealed no metastasis. For this patient, we performed continuous chemotherapy followed by radiotherapy; however, nodule biopsy showed metastases in her lower limbs 3 months after radiotherapy, which confirmed disease progression...
July 28, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28753554/histone-modification-alteration-coordinated-with-acquisition-of-promoter-dna-methylation-during-epstein-barr-virus-infection
#14
Sayaka Funata, Keisuke Matsusaka, Ryota Yamanaka, Shogo Yamamoto, Atsushi Okabe, Masaki Fukuyo, Hiroyuki Aburatani, Masashi Fukayama, Atsushi Kaneda
Aberrant DNA hypermethylation is a major epigenetic mechanism to inactivate tumor suppressor genes in cancer. Epstein-Barr virus positive gastric cancer is the most frequently hypermethylated tumor among human malignancies. Herein, we performed comprehensive analysis of epigenomic alteration during EBV infection, by Infinium HumanMethylation 450K BeadChip for DNA methylation and ChIP-sequencing for histone modification alteration during EBV infection into gastric cancer cell line MKN7. Among 7,775 genes with increased DNA methylation in promoter regions, roughly half were "DNA methylation-sensitive" genes, which acquired DNA methylation in the whole promoter regions and thus were repressed...
July 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28746988/the-association-between-clinical-outcome-and-cd8-lymphocytic-infiltration-in-advanced-stages-of-colorectal-cancer-differs-by-latent-virus-infection-in-the-tumour-tissue
#15
Britta Kleist, Marius Bagdonas, Prakash Oommen, Irina Schoenhardt, Janina Levermann, Micaela Poetsch
AIMS: In near future, an immunoscore based on the quantification of lymphocytic populations can be expected as fundamental supplement of colorectal cancer (CRC) classification. This study explored, whether latent viral infection has an influence on prognostic relevant host immunity in CRC. METHODS AND RESULTS: CD8+ lymphocytic infiltration in three tumour compartments of 121 CRC was compared with clinical data and occurrence of latent infection with HSV1, HSV2, CMV, EBV, HPV16, and HPV18 in the tumour tissue, which was determined by PCR...
July 26, 2017: Histopathology
https://www.readbyqxmd.com/read/28740569/dna-oncogenic-virus-induced-oxidative-stress-genomic-damage-and-aberrant-epigenetic-alterations
#16
REVIEW
Mankgopo Magdeline Kgatle, Catherine Wendy Spearman, Asgar Ali Kalla, Henry Norman Hairwadzi
Approximately 20% of human cancers is attributable to DNA oncogenic viruses such as human papillomavirus (HPV), hepatitis B virus (HBV), and Epstein-Barr virus (EBV). Unrepaired DNA damage is the most common and overlapping feature of these DNA oncogenic viruses and a source of genomic instability and tumour development. Sustained DNA damage results from unceasing production of reactive oxygen species and activation of inflammasome cascades that trigger genomic changes and increased propensity of epigenetic alterations...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28729695/the-epstein-barr-virus-brrf1-gene-is-dispensable-for-viral-replication-in-hek293-cells-and-transformation
#17
Masahiro Yoshida, Takahiro Watanabe, Yohei Narita, Yoshitaka Sato, Fumi Goshima, Hiroshi Kimura, Takayuki Murata
The Epstein-Barr virus (EBV) is a gamma-herpesvirus associated with several malignancies. It establishes a latent infection in B lymphocytes and is occasionally reactivated to enter the lytic cycle. Here we examined the role of the EBV gene BRRF1, which is expressed in the lytic state. We first confirmed, using a DNA polymerase inhibitor, that the BRRF1 gene is expressed with early kinetics. A BRRF1-deficient recombinant virus was constructed using a bacterial artificial chromosome system. No obvious differences were observed between the wild-type, BRRF1-deficient mutant and the revertant virus in HEK293 cells in terms of viral lytic protein expression, viral DNA synthesis, progeny production, pre-latent abortive lytic gene expression and transformation of primary B cells...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729047/p53-deregulation-in-epstein-barr-virus-associated-gastric-cancer
#18
Joana Ribeiro, Mariana Malta, Ana Galaghar, Fernanda Silva, Luís Pedro Afonso, Rui Medeiros, Hugo Sousa
TP53 is a tumour suppressor gene frequently mutated in human cancers; nevertheless, in EBV-associated malignancies mutations are uncommon despite frequent deregulation of the p53 pathway. In this study, we aimed to investigate p53 expression, TP53 mRNA levels and TP53 mutations in EBV-associated gastric carcinoma (EBVaGC). A case-control study was performed using 46 patients: 15 EBVaGC and 31 EBV-negative GC (EBVnGC) cases. p53 expression was detected by immunohistochemistry (IHC), the evaluation of p53 mRNA levels was performed by RT-qPCR and TP53 mutations were investigated only in EBVaGC cases using the DNA sanger sequencing method...
July 17, 2017: Cancer Letters
https://www.readbyqxmd.com/read/28724958/viral-driven-epigenetic-events-alter-the-expression-of-cancer-related-genes-in-epstein-barr-virus-naturally-infected-burkitt-lymphoma-cell-lines
#19
Hector Hernandez-Vargas, Henri Gruffat, Marie Pierre Cros, Audrey Diederichs, Cécilia Sirand, Romina C Vargas-Ayala, Antonin Jay, Geoffroy Durand, Florence Le Calvez-Kelm, Zdenko Herceg, Evelyne Manet, Christopher P Wild, Massimo Tommasino, Rosita Accardi
Epstein-Barr virus (EBV) was identified as the first human virus to be associated with a human malignancy, Burkitt's lymphoma (BL), a pediatric cancer endemic in sub-Saharan Africa. The exact mechanism of how EBV contributes to the process of lymphomagenesis is not fully understood. Recent studies have highlighted a genetic difference between endemic (EBV+) and sporadic (EBV-) BL, with the endemic variant showing a lower somatic mutation load, which suggests the involvement of an alternative virally-driven process of transformation in the pathogenesis of endemic BL...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724765/translesion-polymerase-pol-%C3%AE-is-required-for-efficient-epstein-barr-virus-infectivity-and-is-regulated-by-the-viral-deubiquitinating-enzyme-bplf1
#20
Ossie F Dyson, Joseph S Pagano, Christopher B Whitehurst
Epstein-Barr Virus (EBV) infection and lytic replication are known to induce a cellular DNA damage response. Previously we showed that the virally encoded BPLF1 protein interacts with and regulates several members of the translesion synthesis pathway (TLS), a DNA damage tolerance pathway, and that these cellular factors enhance viral infectivity. BPLF1 is a late lytic cycle gene, but the protein is also packaged in the viral tegument indicating that BPLF1 may function both early and late during infection. BPLF1 expresses deubiquitinating activity that is strictly conserved across the Herpesviridae; mutation of the active-site cysteine results in loss of enzymatic activity...
July 19, 2017: Journal of Virology
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