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https://www.readbyqxmd.com/read/29454261/frequency-of-somatic-tp53-mutations-in-combination-with-known-pathogenic-mutations-in-colon-adenocarcinoma-non-small-cell-lung-carcinoma-and-gliomas-as-identified-by-next-generation-sequencing
#1
Zahra Shajani-Yi, Francine B de Abreu, Jason D Peterson, Gregory J Tsongalis
The tumor suppressor gene TP53 is the most frequently mutated gene in human cancer. It encodes p53, a DNA-binding transcription factor that regulates multiple genes involved in DNA repair, metabolism, cell cycle arrest, apoptosis, and senescence. TP53 is associated with human cancer by mutations that lead to a loss of wild-type p53 function as well as mutations that confer alternate oncogenic functions that enable them to promote invasion, metastasis, proliferation, and cell survival. Identifying the discrete TP53 mutations in tumor cells may help direct therapies that are more effective...
February 13, 2018: Neoplasia: An International Journal for Oncology Research
https://www.readbyqxmd.com/read/29453678/differential-expression-of-the-tweak-receptor-fn14-in-idh1-wild-type-and-mutant-gliomas
#2
David S Hersh, Sen Peng, Jimena G Dancy, Rebeca Galisteo, Jennifer M Eschbacher, Rudy J Castellani, Jonathan E Heath, Teklu Legesse, Anthony J Kim, Graeme F Woodworth, Nhan L Tran, Jeffrey A Winkles
The TNF receptor superfamily member Fn14 is overexpressed by many solid tumor types, including glioblastoma (GBM), the most common and lethal form of adult brain cancer. GBM is notable for a highly infiltrative growth pattern and several groups have reported that high Fn14 expression levels can increase tumor cell invasiveness. We reported previously that the mesenchymal and proneural GBM transcriptomic subtypes expressed the highest and lowest levels of Fn14 mRNA, respectively. Given the recent histopathological re-classification of human gliomas by the World Health Organization based on isocitrate dehydrogenase 1 (IDH1) gene mutation status, we extended this work by comparing Fn14 gene expression in IDH1 wild-type (WT) and mutant (R132H) gliomas and in cell lines engineered to overexpress the IDH1 R132H enzyme...
February 16, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29444314/diffuse-astrocytoma-idh-wildtype-a-dissolving-diagnosis
#3
Martin Hasselblatt, Mohammed Jaber, David Reuss, Oliver Grauer, Annkatrin Bibo, Stephanie Terwey, Uta Schick, Heinrich Ebel, Thomas Niederstadt, Walter Stummer, Andreas von Deimling, Werner Paulus
The histological and molecular features and even the mere existence of diffuse astrocytoma, IDH-wildtype, remain unclear. We therefore examined 212 diffuse astrocytomas (grade II WHO) in adults using IDH1(R132H) immunohistochemistry followed by IDH1/IDH2 sequencing and neuroimaging review. DNA methylation status and copy number profiles were assessed by Infinium HumanMethylation450k BeadChip. Only 25/212 patients harbored tumors without IDH1/IDH2 hotspot mutations and without contrast enhancement. By DNA methylation profiling, 10/25 tumors were classified as glioblastoma, IDH-wildtype, and an additional 7 cases could not be classified using methylome analysis, but showed genetic characteristics of glioblastoma...
February 9, 2018: Journal of Neuropathology and Experimental Neurology
https://www.readbyqxmd.com/read/29441509/nrf2-dj1-and-snrx1-and-their-prognostic-impact-in-astrocytic-gliomas
#4
Joonas Haapasalo, Kristiina Nordfors, Kirsi J Granberg, Tomi Kivioja, Matti Nykter, Hannu Haapasalo, Ylermi Soini
Nuclear factor erythroid 2-related factor 2 (NRF2), DJ1 and sulfiredoxin 1 (SRXN1) are transcription factors which protect cells from the oxidative damage caused by reactive oxygen species and, on the other hand, are associated with resistance to cancer treatments. The immunohistochemical expression of NRF2, DJ1 and SRNX1 was assessed in human grade II - IV astrocytic gliomas. Their association to clinicopathologic and essential molecular factors was evaluated. The RNA expression levels and genetic alterations were analyzed from publicly available datasets...
February 14, 2018: Histology and Histopathology
https://www.readbyqxmd.com/read/29440182/shedding-light-on-idh1-mutation-in-gliomas
#5
Todd C Hollon, Daniel A Orringer
IDH mutation is of central importance in the diagnosis and treatment of gliomas. Fourier-transform infrared spectroscopy, in combination with a supervised machine-learning approach, can be used to detect metabolic alterations induced by IDH1 mutations in a fraction of the time of conventional techniques.
February 13, 2018: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/29434855/promoter-methylation-of-rb1-p15-p16-and-mgmt-and-their-impact-on-the-clinical-course-of-pilocytic-astrocytomas
#6
Christoph Sippl, Steffi Urbschat, Yoo Jin Kim, Sebastian Senger, Joachim Oertel, Ralf Ketter
Promoter methylation of P15, P16, RB transcriptional corepressor 1 (RB1) and O-6-methylguanine-DNA methyltransferase (MGMT) impacts the prognosis of numerous glioma subtypes. However, whether promoter methylation of these genes also has an impact on the clinical course of pilocytic astrocytoma remains unclear. Using methylation-specific polymerase chain reaction, the methylation status of the tumor suppressor genes P15, P16, RB1, and MGMT in pilocytic astrocytomas (n=18) was analyzed. Immunohistochemical staining for the R132H mutation of the isocitrate dehydrogenase (NADP(+)) 1, cytosolic (IDH1) gene was performed...
February 2018: Oncology Letters
https://www.readbyqxmd.com/read/29434344/identification-of-micrornas-differentially-expressed-in-glioblastoma-stem-like-cells-and-their-association-with-patient-survival
#7
Jiri Sana, Petr Busek, Pavel Fadrus, Andrej Besse, Lenka Radova, Marek Vecera, Stefan Reguli, Lucie Stollinova Sromova, Marek Hilser, Radim Lipina, Radek Lakomy, Leos Kren, Martin Smrcka, Aleksi Sedo, Ondrej Slaby
Glioblastoma stem-like cells (GSCs) are critical for the aggressiveness and progression of glioblastoma (GBM) and contribute to its resistance to adjuvant treatment. MicroRNAs (miRNAs) are small, non-coding RNAs controlling gene expression at the post-transcriptional level, which are known to be important regulators of the stem-like features. Moreover, miRNAs have been previously proved to be promising diagnostic biomarkers in several cancers including GBM. Using global expression analysis of miRNAs in 10 paired in-vitro as well as in-vivo characterized primary GSC and non-stem glioblastoma cultures, we identified a miRNA signature associated with the stem-like phenotype in GBM...
February 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29429243/-experimental-studies-on-correlation-between-nucleolus-spindle-related-protein-1-and-the-malignant-progression-and-prognosis-of-human-glioblastoma-multiforme
#8
Y P Xue, X Y Ji, L Yang, H R Liu, Y J Sheng, X X Dai, Y J Xi, J C Liu, J Shi, T Xie, Y S Zhang, J W Ma, J Dong
Objective: To investigate the correlation between nucleolus spindle-related protein 1 (NUSAP1) and malignant progression and prognosis of human glioblastoma multiforme (GBM). Methods: RT-PCR and immunohistochemical technique were applied to analyze NUSAP1 expression level in GBM surgical specimens. Correlations between NUSAP1 expression and molecular classification and survival of patients with GBM were also investigated in TCGA database. The gene silencing technique was used to silence NUSAP1 expression in U87 cells, CCK-8 assay was used to detect cell proliferation, flow cytometry was used to detect cell cycle changes, and in vivo tumorigenicity was evaluated after NUSAP1 silencing in tumor-bearing mice...
January 30, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29428975/5-hydroxymethylcytosine-preferentially-targets-genes-upregulated-in-isocitrate-dehydrogenase-1-mutant-high-grade-glioma
#9
Wioletta K Glowacka, Harshika Jain, Makiko Okura, Abulizi Maimaitiming, Yasin Mamatjan, Romina Nejad, Hamza Farooq, Michael D Taylor, Kenneth Aldape, Paul Kongkham
Gliomas demonstrate epigenetic dysregulation exemplified by the Glioma CpG Island Methylator Phenotype (G-CIMP) seen in IDH1 mutant tumors. 5-Hydroxymethylcytosine (5hmC) is implicated in glioma pathogenesis; however, its role in IDH1 mutant gliomas is incompletely understood. To characterize 5hmC in IDH1 mutant gliomas further, we examine 5hmC in a cohort of IDH1 mutant and wild-type high-grade gliomas (HGG) using a quantitative locus-specific approach. Regions demonstrating high 5hmC abundance and differentially hydroxymethylated regions (DHMR) enrich for enhancers implicated in glioma pathogenesis...
February 10, 2018: Acta Neuropathologica
https://www.readbyqxmd.com/read/29427004/immunohistochemically-detected-idh1r132h-mutation-is-rare-and-mostly-heterogeneous-in-prostate-cancer
#10
Andrea Hinsch, Meta Brolund, Claudia Hube-Magg, Martina Kluth, Ronald Simon, Christina Möller-Koop, Guido Sauter, Stefan Steurer, Andreas Luebke, Alexander Angerer, Corinna Wittmer, Emily Neubauer, Cosima Göbel, Franziska Büscheck, Sarah Minner, Waldemar Wilczak, Thorsten Schlomm, Frank Jacobsen, Till Sebastian Clauditz, Till Krech, Maria Christina Tsourlakis, Cornelia Schroeder
BACKGROUND: IDH1 mutations are oncogenic through induction of DNA damage and genome instability. They are of therapeutic interest because they confer increased sensitivity to radiation and cytotoxic therapy and hold potential for vaccination therapy. METHODS: In this study, we analyzed more than 17,000 primary prostate cancer tissues with a mutation-specific antibody for the IDH1R132H mutation. RESULTS: IDH1 mutation-specific staining was found in 42 of 15,531 (0...
February 9, 2018: World Journal of Urology
https://www.readbyqxmd.com/read/29423539/clinical-prognostic-value-of-the-isocitrate-dehydrogenase-1-single-nucleotide-polymorphism-rs11554137-in-glioblastoma
#11
Akshitkumar M Mistry, Cindy L Vnencak-Jones, Bret C Mobley
The presence of the single-nucleotide polymorphism (SNP) rs11554137:C>T in the IDH1 gene is associated with a significantly lower survival in acute myeloid leukemia patients. The impact of its presence in glioblastoma on patient survival is unclear. We retrospectively reviewed 171 adult (> 18 years of age) patients treated at a single, tertiary academic center for supratentorial glioblastoma (WHO grade IV) between 2013 and 2017. We conducted Kaplan-Meier overall and progression free survival analyses based on the IDH1 and IDH2 gene status of patients' glioblastoma (IDH wild type, mutant, and IDH1 rs11554137:C>T SNP)...
February 8, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29417954/idh1-r132h-predicts-sensitivity-to-bcl-xl-inhibition-mediated-programmed-cell-death
#12
COMMENT
Georg Karpel-Massler, Chiaki Tsuge Ishida, Markus D Siegelin
No abstract text is available yet for this article.
January 2, 2018: Oncotarget
https://www.readbyqxmd.com/read/29414139/idh1-mutation-is-associated-with-a-higher-preoperative-seizure-incidence-in-low-grade-glioma-a-systematic-review-and-meta-analysis
#13
REVIEW
Yucai Li, Xia Shan, Zhifeng Wu, Yinyan Wang, Miao Ling, Xing Fan
PURPOSE: Gliomas, particularly low-grade gliomas (LGGs), are highly epileptogenic. Seizure is the most common presenting sign of LGG patients and significantly decreases their quality of life. Accordingly, there is a need for a better understanding of the mechanisms and risk factors of glioma-related epilepsy. The current study aimed to perform a comprehensive meta-analysis to investigate the correlation of isocitrate-dehydrogenase 1 (IDH1), an important molecular biomarker for glioma classification and prognosis, to preoperative seizure incidence in LGG...
January 25, 2018: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/29413685/picca-study-panitumumab-in-combination-with-cisplatin-gemcitabine-chemotherapy-in-kras-wild-type-patients-with-biliary-cancer-a-randomised-biomarker-driven-clinical-phase-ii-aio-study
#14
Arndt Vogel, Stefan Kasper, Michael Bitzer, Andreas Block, Marianne Sinn, Henning Schulze-Bergkamen, Markus Moehler, Nicole Pfarr, Volker Endris, Benjamin Goeppert, Kirsten Merx, Elisabeth Schnoy, Jens T Siveke, Patrick Michl, Dirk Waldschmidt, Jan Kuhlmann, Michael Geissler, Christoph Kahl, Ralf Evenkamp, Torben Schmidt, Alexander Kuhlmann, Wilko Weichert, Stefan Kubicka
BACKGROUND: Combination chemotherapy has shown benefit in the treatment of biliary cancer and further improvements might be achieved by the addition of a biological agent. We report here the effect of chemotherapy with the monoclonal EGFR antibody panitumumab as therapy for KRAS wild-type biliary cancer. PATIENTS AND METHODS: Patients with advanced biliary tract cancer were randomised (2:1) to receive cisplatin 25 mg/m2 and gemcitabine 1000 mg/m2 on day 1 and day 8/q3w with (arm A) or without panitumumab (arm B; 9 mg/kg BW, i...
January 31, 2018: European Journal of Cancer
https://www.readbyqxmd.com/read/29408647/whole-exome-mutational-and-transcriptional-landscapes-of-combined-hepatocellular-cholangiocarcinoma-and-intrahepatic-cholangiocarcinoma-reveal-molecular-diversity
#15
Zhen-Hao Liu, Bao-Feng Lian, Qiong-Zhu Dong, Han Sun, Jin-Wang Wei, Yuan-Yuan Sheng, Wei Li, Yixue Li, Lu Xie, Lei Liu, Lun-Xiu Qin
BACKGROUND: Primary liver cancer (PLC) is the third largest contributor to cancer mortality in the world. PLC is a heterogeneous disease that encompasses several biologically distinct subtypes including hepatocellular carcinoma (HCC), intrahepatic cholangiocarcinoma (ICC) and combined hepatocellular-cholangiocarcinoma (CHC). CHC is a distinct, albeit rare, subtype of PLC and is comprised of cells with histopathological features of both HCC and ICC. Several studies have focused on the mutation and expression landscapes of HCC and ICC...
January 31, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29404978/high-expression-of-cystine-glutamate-antiporter-xct-slc7a11-is-an-independent-biomarker-for-epileptic-seizures-at-diagnosis-in-glioma
#16
Mai Froberg Sørensen, Sólborg Berglind Heimisdóttir, Mia Dahl Sørensen, Casper Schau Mellegaard, Helle Wohlleben, Bjarne Winther Kristensen, Christoph Patrick Beier
Epileptic seizures are an important cause of morbidity in glioma patients. Substantial lines of evidence support the concept of the excitatory neurotransmitter glutamate being a crucial mediator of glioma-associated seizures. In gliomas, non-vesicular secretion of glutamate via the cystine-glutamate exchanger (SLC7A11, xCT) constitutes the main mechanism contributing to high extracellular glutamate concentrations. However, a convincing "proof-of-relevance" of this mechanism in patient material is lacking. A cohort of 229 consecutive patients with newly diagnosed glioma was analyzed with respect to presence, time course, and severity of epileptic seizures...
February 5, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29393190/pathology-and-genetics-of-gliomas
#17
Takashi Komori, Yoshihiro Muragaki, Mikhail F Chernov
Current World Health Organization (WHO) classification of the neuroepithelial tumors is cell lineage-oriented and based on a presumed developmental tree of the central nervous system (CNS). It defines three main groups of gliomas, namely astrocytomas, oligodendrogliomas, and ependymomas, and additionally presumes their 4-tiered histopathological grading (WHO grades I to IV). Nevertheless, the impact of tumor pathology on clinically related parameters may be frequently much better predicted by genetics, than by histological appearance of the lesion...
2018: Progress in Neurological Surgery
https://www.readbyqxmd.com/read/29393185/perspectives-of-personalized-chemotherapy-of-gliomas-based-on-molecular-tumor-profiling
#18
Riccardo Soffietti, Federica Franchino, Michela Magistrello, Alessia Pellerino, Roberta Rudà
Histopathological typing and grading are the cornerstones of the World Health Organization classification of the central nervous system tumors. It provides clinicians with information on the natural course of the disease and thus guides therapeutic choices. Nonetheless, patients with histologically identical tumors may have different outcomes and response to therapy. In recent years, extensive research has been done on three molecular markers in adult gliomas, namely MGMT promoter methylation, 1p/19q co-deletion, and IDH1/IDH2 mutations...
2018: Progress in Neurological Surgery
https://www.readbyqxmd.com/read/29382206/tof-sims-analysis-of-an-isocitrate-dehydrogenase-1-mutation-associated-oncometabolite-in-cancer-cells
#19
Jungdae Park, Hee-Kyung Na, Hyun Kyong Shon, Hye Young Son, Yong-Min Huh, Sang-Won Lee, Tae Geol Lee
The development of analytical tools for accurate and sensitive detection of intracellular metabolites associated with mutated metabolic enzymes is important in cancer diagnosis and staging. The gene encoding the metabolic enzyme isocitrate dehydrogenase 1 (IDH1) is mutated in various cancers, and mutant IDH1 could represent a good biomarker and potent target for cancer therapy. Owing to a mutation in an important arginine residue in the catalytic pocket, mutant IDH1 catalyzes the production of 2-hydroxyglutarate (2-HG) instead of its wild type product α-ketoglutarate (α-KG), which is involved in multiple cellular pathways involving the hydroxylation of proteins, ribonucleic acid, and deoxyribose nucleic acid (DNA)...
January 30, 2018: Biointerphases
https://www.readbyqxmd.com/read/29378948/lncrna-idh1-as1-links-the-functions-of-c-myc-and-hif1%C3%AE-via-idh1-to-regulate-the-warburg-effect
#20
Shaoxun Xiang, Hao Gu, Lei Jin, Rick F Thorne, Xu Dong Zhang, Mian Wu
The oncoprotein c-Myc plays an important role in regulating glycolysis under normoxia; yet, in cancer cells, HIF1α, which is essential for driving glycolysis under hypoxia, is often up-regulated even in the presence of oxygen. The relationship between these two major regulators of the Warburg effect remains to be fully defined. Here we demonstrate that regulation of a long noncoding RNA (lncRNA), named IDH1-AS1, enables c-Myc to collaborate with HIF1α in activating the Warburg effect under normoxia. c-Myc transcriptionally repressed IDH1-AS1, which, upon expression, promoted homodimerization of IDH1 and thus enhanced its enzymatic activity...
January 29, 2018: Proceedings of the National Academy of Sciences of the United States of America
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