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https://www.readbyqxmd.com/read/28527006/analysis-of-surgical-and-mri-factors-associated-with-cerebellar-mutism
#1
Anjali Sergeant, Michelle Masayo Kameda-Smith, Branavan Manoranjan, Brij Karmur, JoAnn Duckworth, Tina Petrelli, Katey Savage, Olufemi Ajani, Blake Yarascavitch, M Constantine Samaan, Katrin Scheinemann, Cheryl Alyman, Saleh Almenawer, Forough Farrokhyar, Adam J Fleming, Sheila Kumari Singh, Nina Stein
The surgical risk factors and neuro-imaging characteristics associated with cerebellar mutism (CM) remain unclear and require further investigation. Therefore, we aimed to examine surgical and MRI findings associated with CM in children following posterior fossa tumor resection. Using our data registry, we retrospectively collected data from pediatric patients who acquired CM and were matched based on age and pathology type with individuals who did not acquire CM after posterior fossa surgery. The strength of association between surgical and MRI variables and CM were examined using odds ratios (ORs) and corresponding 95% confidence intervals (CIs)...
May 19, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28516074/an-updated-nationwide-epidemiology-of-primary-brain-tumors-in-republic-of-korea-2013
#2
Yun-Sik Dho, Kyu-Won Jung, Johyun Ha, Youngbeom Seo, Chul-Kee Park, Young-Joo Won, Heon Yoo
BACKGROUND: This report aims to provide accurate nationwide epidemiologic data on primary brain and central nervous system (CNS) tumors in the Republic of Korea. We updated the data by analyzing primary brain and CNS tumors diagnosed in 2013 using the data from the national cancer incidence database. METHODS: Data on primary brain and CNS tumors diagnosed in 2013 were collected from the Korean Central Cancer Registry. Crude and age-standardized rates were calculated in terms of gender, age, and histological type...
April 2017: Brain Tumor Research and Treatment
https://www.readbyqxmd.com/read/28515149/pyruvate-kinase-inhibits-proliferation-during-postnatal-cerebellar-neurogenesis-and-suppresses-medulloblastoma-formation
#3
Katherine Tech, Andrey P Tikunov, Hamza Farooq, A Sorana Morrissy, Jessica Meidinger, Taylor Fish, Sarah C Green, Hedi Liu, Yisu Li, Andrew J Mungall, Richard A Moore, Yussanne Ma, Steven Jm Jones, Marco A Marra, Matthew G Vander Heiden, Michael D Taylor, Jeffrey MacDonald, Timothy R Gershon
Aerobic glycolysis supports proliferation through unresolved mechanisms. We have previously shown that aerobic glycolysis is required for the regulated proliferation of cerebellar granule neuron progenitors (CGNPs), and for the growth of CGNP-derived medulloblastoma. Blocking the initiation of glycolysis via deletion of Hexokinase-2 (Hk2) disrupts CGNP proliferation and restricts medulloblastoma growth. Here, we assessed whether disrupting Pyruvate kinase-M (Pkm), an enzyme that acts in the terminal steps of glycolysis, would alter CGNP metabolism, proliferation and tumorigenesis...
May 17, 2017: Cancer Research
https://www.readbyqxmd.com/read/28513871/potential-role-of-long-non-coding-rna-anril-in-pediatric-medulloblastoma-through-promotion-on-proliferation-and-migration-by-targeting-mir-323
#4
Hong Zhang, Xiuli Wang, Xinxin Chen
Medulloblastoma (MB) is a common primary tumor of the central nervous system diagnosed in pediatric patients. Survivors of MB are frequently accompanied by severe side effects, thus it is urgent to explore novel therapeutic target. First of all, the level of antisense non-coding RNA in the INK4 locus (ANRIL) in normal cerebellum and DAOY cells were evaluated. Then, the effect of ANRIL on DAOY cell proliferation, migration and apoptosis were tested. Then, qRT-PCR was performed to explore whether ANRIL acted as a sponge of miR-323...
May 17, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28513139/one-step-facile-synthesis-of-highly-magnetic-and-surface-functionalized-iron-oxide-nanorods-for-biomarker-targeted-applications
#5
Anamaria Ioana Orza, Hui Wu, Yaolin Xu, Qiong Lu, Hui Mao
We report a one-step method for facile and sustainable synthesis of magnetic iron oxide nanorods (or IONRs) with the mean lengths ranging from 25 to 50 nm and mean diameters ranging from 5 to 8 nm. The prepared IONRs are highly stable in aqueous media and can be surface functionalized for biomarker targeted applications. This synthetic strategy involves the reaction of iron(III) acetylacetonate with polyethyleneimine in the presence of oleylamine and phenylether, followed by thermal decomposition. Importantly, the length and diameter as well as the aspect ratio of prepared IONRs can be controlled by modulating the reaction parameters...
May 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28509599/a-review-of-dosimetric-and-toxicity-modeling-of-proton-versus-photon-craniospinal-irradiation-for-pediatrics-medulloblastoma
#6
Evangeline S Q Ho, Sarah A Barrett, Laura M Mullaney
BACKGROUND: Craniospinal irradiation (CSI) is the standard radiation therapy treatment for medulloblastoma. Conventional CSI photon therapy (Photon-CSI) delivers significant dose to surrounding normal tissue (NT). Research into pediatric CSI with proton therapy (Proton-CSI) has increased, with the aim of exploiting the potential to reduce NT dose and associated post-treatment complications. This review aims to compare treatment outcomes of pediatric medulloblastoma patients between Proton- and Photon-CSI treatments...
May 16, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28508928/embryonal-tumors-in-canadian-children-less-than-36-months-of-age-results-from-the-canadian-pediatric-brain-tumor-consortium-cpbtc
#7
E Story, D L Johnston, U Bartels, A S Carret, B Crooks, D D Eisenstat, C Fryer, L Lafay-Cousin, V Larouche, B Wilson, S Zelcer, M Silva, J Brossard, E Bouffet, D L Keene
Embryonal tumors are a heterogeneous group of central nervous system (CNS) tumors whose subgroups have varying incidence and outcome. Despite these differences, they are often grouped as a single entity for study purposes. To date, there are no Canadian multi-institutional studies examining the incidence and outcome of all embryonal subtypes. The current study is an observational study reviewing embryonal tumors in all patients less than 36 months of age diagnosed with a CNS tumor in Canada from 1990 to 2005...
May 16, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28504719/novel-myc-driven-medulloblastoma-models-from-multiple-embryonic-cerebellar-cells
#8
D Kawauchi, R J Ogg, L Liu, D J H Shih, D Finkelstein, B L Murphy, J E Rehg, A Korshunov, C Calabrese, F Zindy, T Phoenix, Y Kawaguchi, J Gronych, R J Gilbertson, P Lichter, A Gajjar, M Kool, P A Northcott, S M Pfister, M F Roussel
Group3 medulloblastoma (MBG3) that predominantly occur in young children are usually associated with MYC amplification and/or overexpression, frequent metastasis and a dismal prognosis. Physiologically relevant MBG3 models are currently lacking, making inferences related to their cellular origin thus far limited. Using in utero electroporation, we here report that MBG3 mouse models can be developed in situ from different multipotent embryonic cerebellar progenitor cells via conditional expression of Myc and loss of Trp53 function in several Cre driver mouse lines...
May 15, 2017: Oncogene
https://www.readbyqxmd.com/read/28504687/the-kinesin-kif14-is-overexpressed-in-medulloblastoma-and-downregulation-of-kif14-suppressed-tumor-proliferation-and-induced-apoptosis
#9
Kay Ka-Wai Li, Yan Qi, Tian Xia, Aden Ka-Yin Chan, Zhen-Yu Zhang, Abudumijiti Aibaidula, Rong Zhang, Liangfu Zhou, Yu Yao, Ho-Keung Ng
Medulloblastoma (MB) is the most common malignant brain tumor in childhood. At present, there is no well-established targeted drug for majority of patients. The kinesin family member 14 (KIF14) is a novel oncogene located on chromosome 1q and is dysregulated in multiple cancers. The objectives of this study were to evaluate KIF14 expression and chromosome 1q copy number in MB, and to delineate its biological functions in MB pathogenesis. By quantitative RT-PCR and immunohistochemistry, we found KIF14 was overexpressed in MB...
May 15, 2017: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/28501783/silencing-of-dna-repair-sensitizes-pediatric-brain-tumor-cells-to-%C3%AE-irradiation-using-gold-nanoparticles
#10
Zuliang Liu, Huiru Yan, Hongsha Li
We present a nanoparticle (NP)-mediated delivery vehicle that effectively carries and protects siRNA in pediatric ependymoma (EP) and medulloblastoma (MB) cells. The delivery vehicle consists of gold NPs coated with a polymeric shell comprising polyethylene glycol (PG), chitosan and polyethyleneimine (Au-CP-PEI). NPs loaded with siRNA knocked down Ape1 expression by over 75% in both MB and EP cells. Further, this reduction in Ape1 expression is associated with an increase in DNA damage after irradiation. The results indicate that NP-associated delivery of siApe1 is a feasible approach to circumventing pediatric brain tumor resistance to radiation therapy...
April 27, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28498095/risk-factors-for-development-of-postoperative-cerebellar-mutism-syndrome-in-children-after-medulloblastoma-surgery
#11
San Y C V Pols, Marie Lise C van Veelen, Femke K Aarsen, Antonia Gonzalez Candel, Coriene E Catsman-Berrevoets
OBJECTIVE Postoperative cerebellar mutism syndrome (pCMS) occurs in 7%-50% of children after cerebellar tumor surgery. Typical features include a latent onset of 1-2 days after surgery, transient mutism, emotional lability, and a wide variety of motor and neurobehavioral abnormalities. Sequelae of this syndrome usually persist long term. The principal causal factor is bilateral surgical damage (regardless of tumor location) to any component of the proximal efferent cerebellar pathway, which leads to temporary dysfunction of cerebral cortical regions as a result of diaschisis...
May 12, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28490517/atoh1-promotes-leptomeningeal-dissemination-and-metastasis-of-sonic-hedgehog-subgroup-medulloblastomas
#12
Katie B Grausam, Samuel Dr Dooyema, Laure Bihannic, Hasitha Premathilake, A Sorana Morrissy, Antoine Forget, Amanda M Schaefer, Justin H Gundelach, Slobodan Macura, Diane M Maher, Xin Wang, Alex H Heglin, Xijin Ge, Erliang Zeng, Stephanie Puget, Indra Chandrasekar, Kameswaran Surendran, Richard J Bram, Ulrich Schüller, Michael D Taylor, Olivier Ayrault, Haotian Zhao
Medulloblastoma (MB) arising from the cerebellum is the most common pediatric brain malignancy, with leptomeningeal metastases often present at diagnosis and recurrence associated with poor clinical outcome. In this study, we employed mouse MB models to explore the relationship of tumor pathophysiology and dysregulated expression of the Notch pathway transcription factor ATOH1, which is present in aggressive MB subtypes driven by aberrant Sonic Hedgehog/Patched (SHH/PTCH) signaling. In experiments with conditional Atoh1 mouse mutants crossed to Ptch1(+/-) mice which develop SHH-driven MB[63], animals with Atoh1 transgene expression developed highly penetrant MB at a young age with extensive leptomeningeal disease and metastasis to the spinal cord and brain, resembling xenografts of human SHH MB...
May 10, 2017: Cancer Research
https://www.readbyqxmd.com/read/28488086/large-cell-anaplastic-medulloblastoma-is-associated-with-poor-prognosis-a-retrospective-analysis-at-a-single-institute
#13
Pin-I Huang, Shih-Chieh Lin, Yi-Yen Lee, Donald Ming-Tak Ho, Wan-Yuo Guo, Kai-Ping Chang, Feng-Chi Chang, Muh-Lii Liang, Hsin-Hung Chen, Yu-Ming Liu, Sang-Hue Yen, Tai-Tong Wong, Yi-Wei Chen
PURPOSE: Medulloblastoma (MB) is the most commonly occurring malignant pediatric brain tumor worldwide. However, a recent study found that the treatment outcomes in those with high-risk disease receiving conventional treatment were suboptimal. This study aimed to assess outcomes and treatment strategies for specific histologic subtypes of pediatric MB. METHODS: A total of 114 pediatric patients (age < 20 years) diagnosed with MB between March 1998 and August 2011 were retrospectively reviewed; 52 that were treated with surgery followed by adjuvant radiotherapy (RT) and chemotherapy (CHT) were included...
May 9, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28487292/gli3-repressor-determines-hedgehog-pathway-activation-and-is-required-for-response-to-smo-antagonist-glasdegib-in-aml
#14
Parvesh Chaudhry, Mohan Singh, Timothy J Triche, Monica Guzman, Akil A Merchant
The Hedgehog (Hh) signaling pathway is activated in many cancers and is a promising target for therapeutic development. Deletions in the receptor Patched (PTCH) or activating mutations in Smoothened (SMO) have been reported in basal cell carcinoma (BCC) and medulloblastoma, but are largely absent in most tumor types; therefore, the mechanism of pathway activation in most cancers, including hematological malignancies, remains unknown. In normal tissues, Hh pathway activation via PTCH/SMO causes an increase in the downstream transcriptional activator GLI1 and a decrease in the transcriptional repressor GLI3R...
May 9, 2017: Blood
https://www.readbyqxmd.com/read/28483947/regulation-of-usp37-expression-by-rest-associated-g9a-dependent-histone-methylation
#15
Tara Dobson, Rashieda J Hatcher, Jyothismathi Swaminathan, Chandra M Das, Shavali Shaik, Rong-Hua Tao, Ciro Milite, Sabrina Castellano, Pete Taylor, Gianluca Sbardella, Vidya Gopalakrishnan
The deubiquitylase (DUB) USP37 is a component of the ubiquitin system and controls cell proliferation by regulating the stability of the cyclin-dependent kinase inhibitor 1B, (CDKN1B/p27Kip1). The expression of USP37 is down-regulated in human medulloblastoma tumor specimens. In the current study we show that USP37 prevents medulloblastoma growth in mouse orthotopic models, suggesting that it has tumor suppressive properties in this neural cancer. Here, we also report on the mechanism underlying USP37 loss in medulloblastoma...
May 8, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28481393/differential-expression-of-micrornas-in-medulloblastoma-and-the-potential-functional-consequences
#16
Yuting Zhang, Lusheng Li, Ping Liang, Xuan Zhai, Yingliang Li, Yudong Zhou
AIM: To identify differentially expressed microRNAs in medulloblastoma, and to investigate their biological function. medulloblastomda farklı olarak ifade microRNA tespit etmek ve bunların biyolojik fonksiyonlarını araştırmak. MATERIAL AND METHODS: Differentially expressed microRNAs were identified using gene chips, and significantly different microRNAs were selected for verification using real time quantitative PCR. Potential target genes and their biological pathways were predicted by bioinformatics software...
April 12, 2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/28475368/tailoring-medulloblastoma-treatment-through-genomics-making-a-change-one-subgroup-at-a-time
#17
Borja L Holgado, Ana Guerreiro Stucklin, Livia Garzia, Craig Daniels, Michael D Taylor
After more than a decade of genomic studies in medulloblastoma, the time has come to capitalize on the knowledge gained and use it to directly improve patient care. Although metastatic and relapsed disease remain poorly understood, much has changed in how we define medulloblastoma, and it has become evident that with conventional therapies, specific groups of patients are currently under- or overtreated. In this review, we summarize the latest insights into medulloblastoma biology, focusing on how genomics is affecting patient stratification, informing preclinical studies of targeted therapies, and shaping the new generation of clinical trials...
May 5, 2017: Annual Review of Genomics and Human Genetics
https://www.readbyqxmd.com/read/28474991/high-programmed-cell-death-1-ligand-1-expression-association-with-cd8-t-cell-infiltration-and-poor-prognosis-in-human-medulloblastoma
#18
Daiki Murata, Yohei Mineharu, Yoshiki Arakawa, Bin Liu, Masahiro Tanji, Makoto Yamaguchi, Ko-Ichi Fujimoto, Nobuyuki Fukui, Yukinori Terada, Ryuta Yokogawa, Maki Yamaguchi, Sachiko Minamiguchi, Susumu Miyamoto
OBJECTIVE Medulloblastoma is a type of malignant tumor arising in the cerebellum. The clinical importance of programmed cell death 1 ligand-1 (PD-L1) expression in medulloblastoma remains unknown. The aim of the present study was to examine the expression of PD-L1 and tumor-infiltrating T cells, and to evaluate their relationships to the prognosis of patients with medulloblastoma. METHODS The authors immunohistochemically analyzed PD-L1 expression and CD3+ and CD8+ lymphocyte infiltrations in tumor specimens from 16 patients with medulloblastoma...
May 5, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28469334/clinical-profile-of-pediatric-oncology-patients-treated-by-external-beam-radiotherapy-an-institutional-experience
#19
Virender Suhag, B S Sunita, Pankaj Vats, Arti Sarin, A K Singh, Mayuri Jain
INTRODUCTION: Pediatric tumors are a heterogeneous group of malignant conditions requiring multimodal treatment, and management of such cases is at time challenging. We present the clinical profile of pediatric cancer patients who received radiation, either alone or as adjuvant to surgery and chemotherapy; in prophylactic, radical or palliative clinical setting. AIM: This study was envisaged to review our experience of pediatric oncology cases, their clinical and morphological profile, dosage schedule of radiotherapy, and the therapy induced complications...
January 2017: Indian Journal of Medical and Paediatric Oncology
https://www.readbyqxmd.com/read/28469330/profile-of-primary-pediatric-brain-and-spinal-cord-tumors-from-north-india
#20
Nadia Shirazi, Meenu Gupta, Nowneet Kumar Bhat, Braham Prakash Kalra, Ranjit Kumar, Manju Saini
BACKGROUND AND OBJECTIVE: The study was carried out to find the profile of pediatric brain and spinal cord tumors during 2006-2015 in a tertiary referral center of North India. MATERIALS AND METHODS: It was a retrospective medical record-based observational study. All children <18 years of age with confirmed histopathological diagnosis of cancer were included in the study. RESULTS: Central nervous system (CNS) tumors constituted 5.6% of all pediatric solid malignancies in our hospital...
January 2017: Indian Journal of Medical and Paediatric Oncology
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