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4 results on '"Sam Ng"'

1. Pituitary metastasis of malignant melanoma misdiagnosed as pituitary adenoma: A case report and systematic review of the literature

Author

Sam Ng, Valentin Favier, Julien Boetto, Louis Crampette, Valérie Rigau, Gaëtan Poulen, Isabelle Raingeard, Service de Neurochirurgie [Montpellier], Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier)-CHU Gui de Chauliac [Montpellier], Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Institut des Neurosciences de Montpellier - Déficits sensoriels et moteurs (INM), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM), CCSD, Accord Elsevier, and Institut des Neurosciences de Montpellier (INM)

Subjects
MESH: Fatal Outcome, Pituitary gland, Dissémination leptoméningée, [SDV.MHEP.CHI] Life Sciences [q-bio]/Human health and pathology/Surgery, medicine.medical_treatment, Endoscopic surgery, Metastasis, MESH: Magnetic Resonance Imaging, Fatal Outcome, 0302 clinical medicine, Positron Emission Tomography Computed Tomography, Leptomeningeal carcinomatosis, Melanoma, Métastase, MESH: Middle Aged, Brain Neoplasms, Transsphénoidal, Middle Aged, Magnetic Resonance Imaging, 3. Good health, medicine.anatomical_structure, 030220 oncology & carcinogenesis, MESH: Brain Neoplasms, MESH: Diagnostic Errors, Pituitary metastasis, Female, [SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC], Radiology, Adenoma, medicine.medical_specialty, MESH: Melanoma, [SDV.MHEP.CHI]Life Sciences [q-bio]/Human health and pathology/Surgery, 03 medical and health sciences, Pituitary adenoma, Cerebrospinal fluid fistula, medicine, Humans, Pituitary Neoplasms, [SDV.NEU] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC], Hypophyse, Diagnostic Errors, MESH: Pituitary Neoplasms, Mélanome, Transsphenoidal surgery, MESH: Adenoma, MESH: Humans, business.industry, Chirurgie endoscopique, Transsphenoidal, medicine.disease, Pituitary, Surgery, Neurology (clinical), MESH: Positron Emission Tomography Computed Tomography, business, MESH: Female, 030217 neurology & neurosurgery
Abstract

International audience; We report a case of malignant melanoma revealed by a metastasis to the pituitary gland. The tumor was misdiagnosed as a pituitary adenoma and aggressive transsphenoidal surgery was complicated by a cerebrospinal fluid fistula. Nine weeks later, the patient presented multiple leptomeningeal and brain metastases spreading from the sellar region. Regarding these observations, we conducted a systematic review of the literature in order to investigate clinicoradiological features that should lead clinicians to suspect pituitary metastasis and how it should impact the surgical management.

Published
2020

3. An inventory and estimate of water stored in firn fields, glaciers, debris-covered glaciers, and rock glaciers in the Aconcagua River Basin, Chile

Author

Sam Ng, Antonio Bellisario, and Jason R. Janke

Subjects
Hydrology, geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Landform, Glacial landform, 0208 environmental biotechnology, Firn, Rock glacier, Glacier, 02 engineering and technology, Permafrost, Glacier morphology, 01 natural sciences, 020801 environmental engineering, Surge, Geology, 0105 earth and related environmental sciences, Earth-Surface Processes
Abstract

An inventory of firn fields, glaciers, debris-covered glaciers, and rock glaciers was conducted in the Aconcagua River Basin of the semiarid Andes of central Chile. A total of 916 landforms were identified, of which rock glaciers were the most abundant (669) and occupied the most total area. Glaciers and debris-covered glaciers were less numerous, but were about five times larger in comparison. The total area occupied by glaciers and debris-covered glaciers was roughly equivalent to the total area of rock glaciers. Debris-covered glaciers and rock glaciers were subcategorized into six ice-content classes based on interpretation of surface morphology with high-resolution satellite imagery. Over 50% of rock glaciers fell within a transitional stage; 85% of debris-covered glaciers were either fully covered or buried. Most landforms occupied elevations between 3500 and 4500 m. Glaciers and firn occurred at higher elevations compared to rock glaciers and debris-covered glaciers. Rock glaciers had a greater frequency in the northern part of the study area where arid climate conditions exist. Firn and glaciers were oriented south, debris-covered glaciers west, and rock glaciers southwest. An analysis of water contribution of each landform in the upper Andes of the Aconcagua River Basin was conducted using formulas that associate the size of the landforms to estimates of water stored. Minimum and maximum water storage was calculated based on a range of debris to ice content ratios for debris-covered glaciers and rock glaciers. In the Aconcagua River Basin, rock glaciers accounted for 48 to 64% of the water stored within the landforms analyzed; glaciers accounted for 15 to 25%; debris-covered glaciers were estimated at 15 to 19%; firn fields contained only about 5 to 8% of the water stored. Expansion of agriculture, prolonged drought, and removal of ice-rich landforms for mining have put additional pressure on already scarce water resources. To develop long-term, sustainable solutions, the importance of the water stored in rock glaciers or other alpine permafrost landforms, such as talus slopes, must be weighed against the economic value of mineral resources.

Published
2017

4. The Somatic Genomic Landscape of Glioblastoma

Author

Cameron W. Brennan, Roel G.W. Verhaak, Aaron McKenna, Benito Campos, Houtan Noushmehr, Sofie R. Salama, Siyuan Zheng, Debyani Chakravarty, J. Zachary Sanborn, Samuel H. Berman, Rameen Beroukhim, Brady Bernard, Chang-Jiun Wu, Giannicola Genovese, Ilya Shmulevich, Jill Barnholtz-Sloan, Lihua Zou, Rahulsimham Vegesna, Sachet A. Shukla, Giovanni Ciriello, W.K. Yung, Wei Zhang, Carrie Sougnez, Tom Mikkelsen, Kenneth Aldape, Darell D. Bigner, Erwin G. Van Meir, Michael Prados, Andrew Sloan, Keith L. Black, Jennifer Eschbacher, Gaetano Finocchiaro, William Friedman, David W. Andrews, Abhijit Guha, Mary Iacocca, Brian P. O’Neill, Greg Foltz, Jerome Myers, Daniel J. Weisenberger, Robert Penny, Raju Kucherlapati, Charles M. Perou, D. Neil Hayes, Richard Gibbs, Marco Marra, Gordon B. Mills, Eric Lander, Paul Spellman, Richard Wilson, Chris Sander, John Weinstein, Matthew Meyerson, Stacey Gabriel, Peter W. Laird, David Haussler, Gad Getz, Lynda Chin, Christopher Benz, Wendi Barrett, Quinn Ostrom, Yingli Wolinsky, Bikash Bose, Paul T. Boulos, Madgy Boulos, Jenn Brown, Christine Czerinski, Matthew Eppley, Thelma Kempista, Teresa Kitko, Yakov Koyfman, Brenda Rabeno, Pawan Rastogi, Michael Sugarman, Patricia Swanson, Kennedy Yalamanchii, Ilana P. Otey, Yingchun Spring Liu, Yonghong Xiao, J.Todd Auman, Peng-Chieh Chen, Angela Hadjipanayis, Eunjung Lee, Semin Lee, Peter J. Park, Jonathan Seidman, Lixing Yang, Steven Kalkanis, Laila M. Poisson, Aditya Raghunathan, Lisa Scarpace, Ryan Bressler, Andrea Eakin, Lisa Iype, Richard B. Kreisberg, Kalle Leinonen, Sheila Reynolds, Hector Rovira, Vesteinn Thorsson, Matti J. Annala, Joseph Paulauskis, Erin Curley, Martha Hatfield, David Mallery, Scott Morris, Troy Shelton, Candace Shelton, Mark Sherman, Peggy Yena, Lucia Cuppini, Francesco DiMeco, Marica Eoli, Emanuela Maderna, Bianca Pollo, Marco Saini, Saianand Balu, Katherine A. Hoadley, Ling Li, C. Ryan Miller, Yan Shi, Michael D. Topal, Junyuan Wu, Gavin Dunn, Caterina Giannini, Brian P. O'Neill, B. Arman Aksoy, Yevgeniy Antipin, Laetitia Borsu, Ethan Cerami, Jianjiong Gao, Benjamin Gross, Anders Jacobsen, Marc Ladanyi, Alex Lash, Yupu Liang, Boris Reva, Nikolaus Schultz, Ronglai Shen, Nicholas D. Socci, Agnes Viale, Martin L. Ferguson, Qing-Rong Chen, John A. Demchok, Laura A.L. Dillon, Kenna R. Mills Shaw, Margi Sheth, Roy Tarnuzzer, Zhining Wang, Liming Yang, Tanja Davidsen, Mark S. Guyer, Bradley A. Ozenberger, Heidi J. Sofia, Julie Bergsten, John Eckman, Jodi Harr, Christine Smith, Kelly Tucker, Cindy Winemiller, Leigh Anne Zach, Julia Y. Ljubimova, Greg Eley, Brenda Ayala, Mark A. Jensen, Ari Kahn, Todd D. Pihl, David A. Pot, Yunhu Wan, Nathan Hansen, Parvi Hothi, Biaoyang Lin, Nameeta Shah, Jae-geun Yoon, Ching Lau, Michael Berens, Kristin Ardlie, Scott L. Carter, Andrew D. Cherniack, Mike Noble, Juok Cho, Kristian Cibulskis, Daniel DiCara, Scott Frazer, Stacey B. Gabriel, Nils Gehlenborg, Jeff Gentry, David Heiman, Jaegil Kim, Rui Jing, Eric S. Lander, Michael Lawrence, Pei Lin, Will Mallard, Robert C. Onofrio, Gordon Saksena, Steve Schumacher, Petar Stojanov, Barbara Tabak, Doug Voet, Hailei Zhang, Nathan N. Dees, Li Ding, Lucinda L. Fulton, Robert S. Fulton, Krishna-Latha Kanchi, Elaine R. Mardis, Richard K. Wilson, Stephen B. Baylin, Larry Harshyne, Mark L. Cohen, Karen Devine, Andrew E. Sloan, Scott R. VandenBerg, Mitchel S. Berger, Daniel Carlin, Brian Craft, Kyle Ellrott, Mary Goldman, Theodore Goldstein, Mia Grifford, Singer Ma, Sam Ng, Joshua Stuart, Teresa Swatloski, Peter Waltman, Jing Zhu, Robin Foss, Barbara Frentzen, Raquel McTiernan, Anthony Yachnis, Yong Mao, Rehan Akbani, Oliver Bogler, Gregory N. Fuller, Wenbin Liu, Yuexin Liu, Yiling Lu, Gordon Mills, Alexei Protopopov, Xiaojia Ren, Youting Sun, W.K. Alfred Yung, Jianhua Zhang, Ken Chen, John N. Weinstein, Moiz S. Bootwalla, Phillip H. Lai, Timothy J. Triche, David J. Van Den Berg, David H. Gutmann, Norman L. Lehman, Erwin G. VanMeir, Daniel Brat, Jeffrey J. Olson, Gena M. Mastrogianakis, Narra S. Devi, Zhaobin Zhang, Darell Bigner, Eric Lipp, and Roger McLendon

Subjects
Male, Telomerase, Proteome, REGULAÇÃO GÊNICA, Somatic cell, Mesenchymal Glioblastoma, PDGFRA, Computational biology, Biology, medicine.disease_cause, Article, General Biochemistry, Genetics and Molecular Biology, medicine, Humans, Gene Regulatory Networks, Gene, Genetics, Glioblastoma cell, Mutation, Brain Neoplasms, Biochemistry, Genetics and Molecular Biology(all), Gene Expression Profiling, Phenotype, Gene expression profiling, DNA methylation, Cancer research, Female, Glioblastoma, Signal Transduction
Abstract

SummaryWe describe the landscape of somatic genomic alterations based on multidimensional and comprehensive characterization of more than 500 glioblastoma tumors (GBMs). We identify several novel mutated genes as well as complex rearrangements of signature receptors, including EGFR and PDGFRA. TERT promoter mutations are shown to correlate with elevated mRNA expression, supporting a role in telomerase reactivation. Correlative analyses confirm that the survival advantage of the proneural subtype is conferred by the G-CIMP phenotype, and MGMT DNA methylation may be a predictive biomarker for treatment response only in classical subtype GBM. Integrative analysis of genomic and proteomic profiles challenges the notion of therapeutic inhibition of a pathway as an alternative to inhibition of the target itself. These data will facilitate the discovery of therapeutic and diagnostic target candidates, the validation of research and clinical observations and the generation of unanticipated hypotheses that can advance our molecular understanding of this lethal cancer.

Published
2013
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