scholarly journals Molecular analysis of pediatric brain tumors identifies microRNAs in pilocytic astrocytomas that target the MAPK and NF-κB pathways

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Tania A. Jones ◽  
Jennie N. Jeyapalan ◽  
Tim Forshew ◽  
Ruth G. Tatevossian ◽  
Andrew R. J. Lawson ◽  
...  
Keyword(s):  
Brain Tumors ◽  
Molecular Analysis ◽  
Pediatric Brain Tumors ◽  
Pilocytic Astrocytomas ◽  
Pediatric Brain

scholarly journals EMBR-04. WHAT THE FOX SAY? A MOLECULAR ANALYSIS OF FOXR2 IN PEDIATRIC BRAIN TUMORS

2018 ◽  
Vol 20 (suppl_2) ◽  
pp. i69-i69 ◽  
Author(s):  
Sjoerd van Rijn ◽  
Mikaella Vouri ◽  
Stefan M Pfister ◽  
Daisuke Kawauchi ◽  
Marcel Kool
Keyword(s):  
Brain Tumors ◽  
Molecular Analysis ◽  
Pediatric Brain Tumors ◽  
Pediatric Brain

Molecular analysis of pediatric brain tumors

2004 ◽  
Vol 6 (6) ◽  
pp. 445-452 ◽  
Author(s):  
Jaclyn A. Biegel ◽  
Ian F. Pollack
Keyword(s):  
Brain Tumors ◽  
Molecular Analysis ◽  
Pediatric Brain Tumors ◽  
Pediatric Brain

scholarly journals HGG-19. 5-AMINOLEVULINIC ACID (5-ALA)-GUIDED RESECTION OF PEDIATRIC BRAIN TUMORS

2021 ◽  
Vol 23 (Supplement_1) ◽  
pp. i21-i21
Author(s):  
Michael Schwake ◽  
Ann-Katrin Bruns ◽  
Michael Müther ◽  
Stephanie Schipmann ◽  
Walter Stummer
Keyword(s):  
Brain Tumors ◽  
Aminolevulinic Acid ◽  
Pediatric Brain Tumors ◽  
Fluorescence Signal ◽  
Normal Brain ◽  
Who Grade ◽  
Guided Surgery ◽  
Pilocytic Astrocytomas ◽  
Prospective Phase ◽  
Pediatric Brain

Abstract Between tumor and normal brain, allowing a higher degree of resection, and improved patient outcomes. In recent years, several reports have emerged regarding the use of 5-ALA in other brain tumor entities, including pediatric brains tumors. Since gross total resection (GTR) of many brain tumors in children is crucial, the role of 5-ALA-guided resection requires elucidation. Methods A systematic literature review of EMBASE and MEDLINE/PubMed databases revealed 20 eligible publications encompassing 186 5-ALA-guided operations on pediatric brain tumors. To reduce bias, publications were revised independently by two authors. Results 5-ALA-guided resection enabled the surgeons to identify the tumor more easily and was considered helpful mainly in cases of glioblastoma (GBM, 21/27, 78%), anaplastic ependymoma WHO grade III (10/14, 71%), and anaplastic astrocytoma (4/6, 67%). In contrast, cases of pilocytic astrocytomas (PAs) and medulloblastomas 5-ALA-guided surgery did not show consistent fluorescent signals and 5-ALA was considered helpful only in 12% and 22% of cases, respectively. Accumulation of fluorescent porphyrins seems to depend on WHO tumor grading. In case fluorescence signal was considered helpful, it was associated with a greater degree of resection. One study showed an association between visible fluoresce signal and concentration of protopophyrin IX (PPIX) concentration. A threshold of 4μg/ml was required in order to visualize the fluorescence signal. The rate of adverse events related to 5-ALA was negligible, especially new postoperative sequelae. Conclusion 5-ALA could play a role in resection of malignant, contrast enhancing, supratentorial pediatric brain tumors. At present, we are conducting a prospective phase I-II multicenter clinical trial to evaluate side effects and feasibility of 5-ALA guided surgery.

scholarly journals A pediatric brain tumor atlas of genes deregulated by somatic genomic rearrangement

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yiqun Zhang ◽  
Fengju Chen ◽  
Lawrence A. Donehower ◽  
Michael E. Scheurer ◽  
Chad J. Creighton
Keyword(s):  
Brain Tumor ◽  
Brain Tumors ◽  
Tyrosine Kinases ◽  
Pediatric Brain Tumor ◽  
Pediatric Brain Tumors ◽  
Altered Expression ◽  
Critical Pathways ◽  
Cis Regulation ◽  
Or Gene ◽  
Pediatric Brain

AbstractThe global impact of somatic structural variants (SSVs) on gene expression in pediatric brain tumors has not been thoroughly characterised. Here, using whole-genome and RNA sequencing from 854 tumors of more than 30 different types from the Children’s Brain Tumor Tissue Consortium, we report the altered expression of hundreds of genes in association with the presence of nearby SSV breakpoints. SSV-mediated expression changes involve gene fusions, altered cis-regulation, or gene disruption. SSVs considerably extend the numbers of patients with tumors somatically altered for critical pathways, including receptor tyrosine kinases (KRAS, MET, EGFR, NF1), Rb pathway (CDK4), TERT, MYC family (MYC, MYCN, MYB), and HIPPO (NF2). Compared to initial tumors, progressive or recurrent tumors involve a distinct set of SSV-gene associations. High overall SSV burden associates with TP53 mutations, histone H3.3 gene H3F3C mutations, and the transcription of DNA damage response genes. Compared to adult cancers, pediatric brain tumors would involve a different set of genes with SSV-altered cis-regulation. Our comprehensive and pan-histology genomic analyses reveal SSVs to play a major role in shaping the transcriptome of pediatric brain tumors.

scholarly journals RONC-19. TWO CASES OF RE-IRRADIATION FOR LATE RECURRENT OR RADIATION-INDUCED TUMOR AFTER RADIATION THERAPY FOR PEDIATRIC BRAIN TUMORS

2020 ◽  
Vol 22 (Supplement_3) ◽  
pp. iii459-iii459
Author(s):  
Takashi Mori ◽  
Shigeru Yamaguchi ◽  
Rikiya Onimaru ◽  
Takayuki Hashimoto ◽  
Hidefumi Aoyama
Keyword(s):  
Radiation Therapy ◽  
Brain Tumors ◽  
Tumor Resection ◽  
Intensity Modulated Radiation Therapy ◽  
Late Recurrence ◽  
Pediatric Brain Tumors ◽  
Suprasellar Region ◽  
Radiation Induced ◽  
Pediatric Brain

Abstract BACKGROUND As the outcome of pediatric brain tumors improves, late recurrence and radiation-induced tumor cases are more likely to occur, and the number of cases requiring re-irradiation is expected to increase. Here we report two cases performed intracranial re-irradiation after radiotherapy for pediatric brain tumors. CASE 1: 21-year-old male. He was diagnosed with craniopharyngioma at eight years old and underwent a tumor resection. At 10 years old, the local recurrence of suprasellar region was treated with 50.4 Gy/28 fr of stereotactic radiotherapy (SRT). After that, other recurrent lesions appeared in the left cerebellopontine angle, and he received surgery three times. The tumor was gross totally resected and re-irradiation with 40 Gy/20 fr of SRT was performed. We have found no recurrence or late effects during the one year follow-up. CASE 2: 15-year-old female. At three years old, she received 18 Gy/10 fr of craniospinal irradiation and 36 Gy/20 fr of boost to the posterior fossa as postoperative irradiation for anaplastic ependymoma and cured. However, a anaplastic meningioma appeared on the left side of the skull base at the age of 15, and 50 Gy/25 fr of postoperative intensity-modulated radiation therapy was performed. Two years later, another meningioma developed in the right cerebellar tent, and 54 Gy/27 fr of SRT was performed. Thirty-three months after re-irradiation, MRI showed a slight increase of the lesion, but no late toxicities are observed. CONCLUSION The follow-up periods are short, however intracranial re-irradiation after radiotherapy for pediatric brain tumors were feasible and effective.

scholarly journals Ras, TrkB, and ShcA Protein Expression Patterns in Pediatric Brain Tumors

2021 ◽  
Vol 10 (10) ◽  
pp. 2219
Author(s):  
Monika Prill ◽  
Agnieszka Karkucinska-Wieckowska ◽  
Magdalena Lebiedzinska-Arciszewska ◽  
Giampaolo Morciano ◽  
Agata Charzynska ◽  
...  
Keyword(s):  
Brain Tumors ◽  
Expression Patterns ◽  
Pediatric Brain Tumors ◽  
Astrocytic Tumors ◽  
Embryonal Tumors ◽  
Altered Expression ◽  
Malignancy Grade ◽  
Oligodendroglial Tumors ◽  
Different Types ◽  
Pediatric Brain

Numerous papers have reported altered expression patterns of Ras and/or ShcA proteins in different types of cancers. Their level can be potentially associated with oncogenic processes. We analyzed samples of pediatric brain tumors reflecting different groups such as choroid plexus tumors, diffuse astrocytic and oligodendroglial tumors, embryonal tumors, ependymal tumors, and other astrocytic tumors as well as tumor malignancy grade, in order to characterize the expression profile of Ras, TrkB, and three isoforms of ShcA, namely, p66Shc, p52Shc, and p46Shc proteins. The main aim of our study was to evaluate the potential correlation between the type of pediatric brain tumors, tumor malignancy grade, and the expression patterns of the investigated proteins.

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