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https://www.readbyqxmd.com/read/28088842/unbiased-split-variable-selection-for-random-survival-forests-using-maximally-selected-rank-statistics
#1
Marvin N Wright, Theresa Dankowski, Andreas Ziegler
The most popular approach for analyzing survival data is the Cox regression model. The Cox model may, however, be misspecified, and its proportionality assumption may not always be fulfilled. An alternative approach for survival prediction is random forests for survival outcomes. The standard split criterion for random survival forests is the log-rank test statistic, which favors splitting variables with many possible split points. Conditional inference forests avoid this split variable selection bias. However, linear rank statistics are utilized by default in conditional inference forests to select the optimal splitting variable, which cannot detect non-linear effects in the independent variables...
January 15, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28088602/aggressive-surgical-approach-to-the-management-of-neuroendocrine-tumors-a-report-of-1-000-surgical-cytoreductions-by-a-single-institution
#2
Eugene A Woltering, Brianne A Voros, David T Beyer, Yi-Zarn Wang, Ramcharan Thiagarajan, Pamela Ryan, Anne Wright, Robert A Ramirez, M Jennifer Ricks, J Philip Boudreaux
BACKGROUND: Neuroendocrine tumors (NETs) are rare neoplasms. Our group has treated over 2,000 NET patients and has performed over 1,000 surgical cytoreductive procedures. STUDY DESIGN: Records of 834 NET patients who underwent surgical cytoreduction at our institution were reviewed. Demographic information, intraoperative findings, extent of disease, complications, and survival rates were calculated. RESULTS: 800 patients underwent 1,001 cytoreductive surgeries...
January 11, 2017: Journal of the American College of Surgeons
https://www.readbyqxmd.com/read/28087919/presumptive-spontaneous-lysosomal-storage-like-disease-in-a-crl-cd1-icr-mouse
#3
Krista M
A clinically unremarkable 4.5-mo-old female Crl:CD1(ICR) VAF/Elite mouse was euthanized for scheduled sentinel processing.Gross necropsy findings included significant hepatosplenomegaly and visceral lymphadenomegaly, resulting in a preliminarygross diagnosis of lymphoma. Histology revealed florid accumulations of large, 'foamy' macrophages present in the bone marrow, small intestines, and viscera including liver, spleen, lymph nodes, thymus, uterus, and ovaries. The cytoplasm of these cells was abundant, stained pale blue with Wright-Giemsa and was periodic acid-Schiff positive...
January 13, 2017: Comparative Medicine
https://www.readbyqxmd.com/read/28087865/recreational-cannabinoid-use-the-hazards-behind-the-high
#4
REVIEW
Steven Wright, Julius Metts
Marijuana use can cause concerning physical, psychomotor, cognitive, and psychiatric effects, not to mention a near-doubling of car accidents.
November 2016: Journal of Family Practice
https://www.readbyqxmd.com/read/28087712/pdx1-dynamically-regulates-pancreatic-ductal-adenocarcinoma-initiation-and-maintenance
#5
Nilotpal Roy, Kenneth K Takeuchi, Jeanine M Ruggeri, Peter Bailey, David Chang, Joey Li, Laura Leonhardt, Sapna Puri, Megan T Hoffman, Shan Gao, Christopher J Halbrook, Yan Song, Mats Ljungman, Shivani Malik, Christopher V E Wright, David W Dawson, Andrew V Biankin, Matthias Hebrok, Howard C Crawford
Aberrant activation of embryonic signaling pathways is frequent in pancreatic ductal adenocarcinoma (PDA), making developmental regulators therapeutically attractive. Here we demonstrate diverse functions for pancreatic and duodenal homeobox 1 (PDX1), a transcription factor indispensable for pancreas development, in the progression from normal exocrine cells to metastatic PDA. We identify a critical role for PDX1 in maintaining acinar cell identity, thus resisting the formation of pancreatic intraepithelial neoplasia (PanIN)-derived PDA...
December 15, 2016: Genes & Development
https://www.readbyqxmd.com/read/28087522/nicholas-wright
#6
Ian Ellison-Wright
No abstract text is available yet for this article.
January 13, 2017: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/28087514/the-influence-of-meteorological-factors-and-atmospheric-pollutants-on-the-risk-of-preterm-birth
#7
Lise Giorgis-Allemand, Marie Pedersen, Claire Bernard, Inmaculada Aguilera, Rob M J Beelen, Leda Chatzi, Marta Cirach, Asta Danileviciute, Audrius Dedele, Manon van Eijsden, Marisa Estarlich, Ana Fernández-Somoano, Mariana F Fernández, Francesco Forastiere, Ulrike Gehring, Regina Grazuleviciene, Olena Gruzieva, Barbara Heude, Gerard Hoek, Kees de Hoogh, Edith H van den Hooven, Siri E Håberg, Carmen Iñiguez, Vincent W V Jaddoe, Michal Korek, Aitana Lertxundi, Johanna Lepeule, Per Nafstad, Wenche Nystad, Evridiki Patelarou, Daniela Porta, Dirkje Postma, Ole Raaschou-Nielsen, Peter Rudnai, Valérie Siroux, Jordi Sunyer, Euripides Stephanou, Mette Sørensen, Kirsten Thorup Eriksen, Derek Tuffnell, Mihály J Varró, Tanja G M Vrijkotte, Alet Wijga, John Wright, Mark J Nieuwenhuijsen, Göran Pershagen, Bert Brunekreef, Manolis Kogevinas, Rémy Slama
Atmospheric pollutants and meteorological conditions are suspected to be causes of preterm birth. We aimed to characterize their possible association with the risk of preterm birth (defined as birth occurring before 37 completed gestational weeks). We pooled individual data from 13 birth cohorts in 11 European countries (71,493 births from the period 1994-2011, European Study of Cohorts for Air Pollution Effects (ESCAPE)). City-specific meteorological data from routine monitors were averaged over time windows spanning from 1 week to the whole pregnancy...
January 13, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28087160/mri-retrieval-analysis-and-histologic-evaluation-of-adverse-local-tissue-reaction-in-metal-on-polyethylene-total-hip-arthroplasty
#8
Scott R Nodzo, Christina I Esposito, Hollis G Potter, Chitranjan S Ranawat, Timothy M Wright, Douglas E Padgett
BACKGROUND: The severity and location of adverse local tissue reaction (ALTR) seen in metal-on-polyethylene total hip arthroplasty (THA) is not well described. METHODS: We retrospectively reviewed the records of patients who underwent a revision THA using our biomechanics database. We included all patients who underwent revision surgery for the diagnosis of ALTR with THA implants that had modularity solely at the head-neck junction and excluded patients with implant modularity at sites other than the head-neck junction...
December 8, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28081583/-early-results-of-adjuvant-topical-treatment-of-recurrent-osteomyelitis-with-absorbable-antibiotic-carriers
#9
Y Gramlich, G Walter, J Gils, R Hoffmann
Background Treatment of musculoskeletal infections principally consists of radical surgical debridement and systemic administration of antibiotics. Additional local antibiotic therapy is not yet generally established, and lacks evidence-based proof of efficacy. Nonetheless, there are a variety of practical approaches, as most specialised departments are unwilling to forego this option. The established polymethylmetacrylate (PMMA) carrier system has a number of practical disadvantages. This has led to the increased use of absorbable carrier systems, and those based on calcium sulphate have given particularly encouraging results...
January 12, 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/28078815/repeat-measurements-of-uterine-artery-pulsatility-index-mean-arterial-pressure-and-serum-placental-growth-factor-at-12-22-and-32-weeks-in-the-prediction-of-preeclampsia
#10
Silvia Andrietti, Stefania Carlucci, Alan Wright, David Wright, Kypros H Nicolaides
OBJECTIVE: To investigate the potential value of repeat measurements of uterine artery pulsatility index (UTPI), mean arterial pressure (MAP) and serum placental growth factor (PLGF) at 12, 22 and 32 weeks' gestation in the prediction of preeclampsia (PE) after 32 weeks. METHODS: The data were derived from prospective screening for adverse obstetric outcomes in women attending for their routine hospital visit at 11-13, 19-24 and / or 30-34 weeks' gestation in two maternity hospitals in England...
January 12, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28077672/potentiation-of-ceftazidime-by-avibactam-against-%C3%AE-lactam-resistant-pseudomonas-aeruginosa-in-an-in-vitro-infection-model
#11
Sherwin K B Sy, Luning Zhuang, Marie-Eve Beaudoin, Philipp Kircher, Maria A M Tabosa, Noely C T Cavalcanti, Christian Grunwitz, Sebastian Pieper, Virna J Schuck, Wright W Nichols, Hartmut Derendorf
OBJECTIVES: This study evaluated the in vitro pharmacodynamics of combinations of ceftazidime and the non-β-lactam β-lactamase inhibitor, avibactam, against ceftazidime-, piperacillin/tazobactam- and meropenem-multiresistant Pseudomonas aeruginosa by a quantitative time-kill method. METHODS: MICs of ceftazidime plus 0-16 mg/L avibactam were determined against eight isolates of P. aeruginosa Single-compartment, 24 h time-kill kinetics were investigated for three isolates at 0-16 mg/L avibactam with ceftazidime at 0...
January 10, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28077177/transcatheter-closure-of-secundum-atrial-septal-defects-has-fear-of-device-erosion-altered-outcomes
#12
Bryan Mitchelson, Clare O'Donnell, Peter Ruygrok, John Wright, John Stirling, Nigel Wilson
BACKGROUND: Transcatheter device closure has become the established standard of care for suitable atrial septal defects. Device erosion has been a recent focus and has prompted changes in the Instructions for Users documentation released by device companies. We reviewed our entire local experience with atrial septal defect device closure, focussing on the evolution of this procedure in our centre and particularly on complications. METHODS: We carried out a retrospective review of 581 consecutive patients undergoing attempted transcatheter device closure of an atrial septal defect in Auckland from December 1997 to June 2014...
January 12, 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/28077044/reducing-health-disparities-for-women-through-use-of-the-medical-home-model
#13
Patricia Moyle Wright
BACKGROUND: Healthcare services can be difficult to access, particularly for low-income or underinsured women. One way of overcoming the barriers to quality, patient-centered care is through the use of the Medical Home Model (MHM). The MHM is a cost-effective approach to care that improves patient outcomes and improves access. In this article, the benefits of extending the MHM into the area of women's health will be discussed. AIM: The purpose of this article is to discuss barriers to healthcare, with an emphasis on reducing healthcare disparities for women...
January 11, 2017: Contemporary Nurse
https://www.readbyqxmd.com/read/28076755/rad51-is-a-selective-dna-repair-target-to-radiosensitize-glioma-stem-cells
#14
Harry O King, Tim Brend, Helen L Payne, Alexander Wright, Thomas A Ward, Karan Patel, Teklu Egnuni, Lucy F Stead, Anjana Patel, Heiko Wurdak, Susan C Short
Patients with glioblastoma die from local relapse despite surgery and high-dose radiotherapy. Resistance to radiotherapy is thought to be due to efficient DNA double-strand break (DSB) repair in stem-like cells able to survive DNA damage and repopulate the tumor. We used clinical samples and patient-derived glioblastoma stem cells (GSCs) to confirm that the DSB repair protein RAD51 is highly expressed in GSCs, which are reliant on RAD51-dependent DSB repair after radiation. RAD51 expression and RAD51 foci numbers fall when these cells move toward astrocytic differentiation...
January 10, 2017: Stem Cell Reports
https://www.readbyqxmd.com/read/28076663/synthesis-and-biological-evaluation-of-novel-amidinourea-and-triazine-congeners-as-inhibitors-of-mda-mb-231-human-breast-cancer-cell-proliferation
#15
Daniele Castagnolo, Rosemary Bass, Sarah Jenkinson, Jennifer Wright, Tora Smulders-Srinivasan, Jamie C Marshall
A series of novel amidinourea derivatives has been synthesised and the new compounds have been evaluated as inhibitors of MDA-MB-231 human breast cancer cell proliferation. In addition, a second series of triazine derivatives designed as rigid congeners of the amidinoureas was synthesised as well and the compounds were evaluated for their antiproliferative activity. Among the two series, the amidinourea 3d emerged as a potent anticancer hit compound with IC50 = 0.76 micormolar comparable to tamoxifen.
January 11, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28075471/alterations-in-splenic-function-and-gene-expression-in-mice-with-depressive-like-behavior-induced-by-exposure-to-corticosterone
#16
Heqin Zhan, Feng Huang, Fulin Yan, Zhenghang Zhao, Jixia Zhang, Taizhen Cui, Fan Yang, Guangfan Hai, Xiaoman Jia, Yongji Shi
Depressed patients present with increased cortisol levels and attenuated immune responses. However, little is known about the association between depression and the spleen, as this is the largest peripheral immune organ. In this study, we examined alterations in splenic function and gene expression in mice with depressive-like behavior, well as the expression of certain proteins in related pathways. A mouse model of depression was established with the use of corticosterone. Splenic function and histopathology were assessed using Wright and H&E staining...
January 5, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28074950/self-neutralizing-oligonucleotides-with-enhanced-cellular-uptake
#17
Ivan Yanachkov, Boris Zavizion, Valeri Metelev, Laura J Stevens, Yekaterina Tabatadze, Milka Yanachkova, George Wright, Anna M Krichevsky, David R Tabatadze
There is tremendous potential for oligonucleotide (ON) therapeutics, but low cellular penetration due to their polyanionic nature is a major obstacle. We addressed this problem by developing a new approach for ON charge neutralization in which multiple branched charge-neutralizing sleeves (BCNSs) are attached to the internucleoside phosphates of ON by phosphotriester bonds. The BCNSs are terminated with positively charged amino groups, and are optimized to form ion pairs with the neighboring phosphate groups...
January 11, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28074012/reduced-abundance-of-the-e3-ubiquitin-ligase-e6ap-contributes-to-decreased-expression-of-the-ink4-arf-locus-in-non-small-cell-lung-cancer
#18
Cristina Gamell, Twishi Gulati, Yaara Levav-Cohen, Richard J Young, Hongdo Do, Pat Pilling, Elena Takano, Neil Watkins, Stephen B Fox, Prudence Russell, Doron Ginsberg, Brendon J Monahan, Gavin Wright, Alex Dobrovic, Sue Haupt, Ben Solomon, Ygal Haupt
The tumor suppressor p16(INK4a), one protein encoded by the INK4/ARF locus, is frequently absent in multiple cancers, including non-small cell lung cancer (NSCLC). Whereas increased methylation of the encoding gene (CDKN2A) accounts for its loss in a third of patients, no molecular explanation exists for the remainder. We unraveled an alternative mechanism for the silencing of the INK4/ARF locus involving the E3 ubiquitin ligase and transcriptional cofactor E6AP (also known as UBE3A). We found that the expression of three tumor suppressor genes encoded in the INK4/ARF locus (p15(INK4b), p16(INK4a), and p19(ARF)) was decreased in E6AP(-/-) mouse embryo fibroblasts...
January 10, 2017: Science Signaling
https://www.readbyqxmd.com/read/28073815/costs-of-care-for-hospitalized-children-associated-with-preferred-language-and-insurance-type
#19
K Casey Lion, Davene R Wright, Arti D Desai, Rita Mangione-Smith
OBJECTIVE: The study goal was to determine whether preferred language for care and insurance type are associated with cost among hospitalized children. METHODS: A retrospective cohort study was conducted of inpatients at a freestanding children's hospital from January 2011 to December 2012. Patient information and hospital costs were obtained from administrative data. Cost differences according to language and insurance were calculated using multivariate generalized linear model estimates, allowing for language/insurance interaction effects...
January 10, 2017: Hospital Pediatrics
https://www.readbyqxmd.com/read/28072893/a-pediatric-application-of-the-strac-regional-hospital-trauma-registry-database-pediatric-trauma-deaths-in-south-central-texas-during-2004-2013
#20
Michelle Buehner, Jay Aden, Mathew Borgman, Preston Love, Brandi Wright, Mary Edwards
The purpose of this study was to define the demographics of pediatric traumatic injuries and to understand the predictive value of injury type, prehospital, and emergency department (ED) data regarding the mortality of pediatric trauma patients (<14 years of age) in South Central Texas. We report a retrospective review of pediatric trauma patients presenting to Trauma Service Area P in South Central Texas during 2004-2013. The primary outcome was mortality; secondary outcomes were ventilator days, hospital days, and intensive care unit stay...
January 1, 2017: Texas Medicine
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