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Christopher fletcher

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https://www.readbyqxmd.com/read/28512850/in-situ-handheld-3d-bioprinting-for-cartilage-regeneration
#1
Claudia Di Bella, Serena Duchi, Cathal D O'Connell, Romane Blanchard, Cheryl Augustine, Zhilian Yue, Fletcher Thompson, Christopher Richards, Stephen Beirne, Carmine Onofrillo, Sebastien H Bauquier, Stewart D Ryan, Peter Pivonka, Gordon G Wallace, Peter F Choong
Articular cartilage injuries experienced at an early age can lead to the development of osteoarthritis later in life. In situ 3D printing is an exciting and innovative bio-fabrication technology that enables the surgeon to deliver tissue- engineering techniques at the time and location of need. We have created a hand- held 3D printing device (Biopen) that allows the simultaneous co-axial extrusion of bioscaffold and cultured cells directly into the cartilage defect in vivo in a single session surgery. This pilot study assesses the ability of the Biopen to repair a full thickness chondral defect and the early outcomes in cartilage regeneration, and compares these results to other treatments in a large animal model...
May 17, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28505006/myopericytomatosis-clinicopathologic-analysis-of-11-cases-with-molecular-identification-of-recurrent-pdgfrb-alterations-in-myopericytomatosis-and-myopericytoma
#2
Yin P Hung, Christopher D M Fletcher
Myopericytoma is a benign tumor of concentrically distributed perivascular myoid cells. Its molecular basis and relationship with myofibroma/myofibromatosis and other pericytic tumors are not fully understood. In our consultation/surgical files of over 1000 myopericytic lesions, we identified 11 cases with diffuse dermal/subcutaneous involvement by microscopic myopericytomatous nodules, a phenomenon we have termed myopericytomatosis. Myopericytomatosis affected mostly adults (female:male=8:3; median age, 37 y; range, 9 to 63 y) in the lower extremities (foot/ankle, 5; calf, 3; knee, 1; thigh, 1; neck, 1) over months to 25 years, ranging from 1...
May 12, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28505004/a-subset-of-malignant-mesotheliomas-in-young-adults-are-associated-with-recurrent-ewsr1-fus-atf1-fusions
#3
Patrice Desmeules, Philippe Joubert, Lei Zhang, Hikmat A Al-Ahmadie, Christopher D Fletcher, Efsevia Vakiani, Deborah F Delair, Natasha Rekhtman, Marc Ladanyi, William D Travis, Cristina R Antonescu
Malignant mesothelioma (MM) is a rare, aggressive tumor often associated with asbestos exposure and characterized by complex genetic abnormalities, including deletions of chromosome 22. A gene fusion involving EWSR1 and YY1 gene on 14q32 has been reported in 2 patients over the age of 60 with peritoneal MM. However, the incidence of EWSR1 rearrangements in MM and the spectrum of its fusion partners remain unknown. We recently encountered 2 MM cases with EWSR1-ATF1 fusions and sought to investigate the prevalence and clinicopathologic features associated with this abnormality...
May 12, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28498505/autosomal-dominant-frontometaphyseal-dysplasia-delineation-of-the-clinical-phenotype
#4
Emma M Wade, Zandra A Jenkins, Philip B Daniel, Tim Morgan, Marie C Addor, Lesley C Adés, Debora Bertola, Axel Bohring, Erin Carter, Tae-Joon Cho, Christa M de Geus, Hans-Christoph Duba, Elaine Fletcher, Kinga Hadzsiev, Raoul C M Hennekam, Chong A Kim, Deborah Krakow, Eva Morava, Teresa Neuhann, David Sillence, Andrea Superti-Furga, Hermine E Veenstra-Knol, Dagmar Wieczorek, Louise C Wilson, David M Markie, Stephen P Robertson
Frontometaphyseal dysplasia (FMD) is caused by gain-of-function mutations in the X-linked gene FLNA in approximately 50% of patients. Recently we characterized an autosomal dominant form of FMD (AD-FMD) caused by mutations in MAP3K7, which accounts for the condition in the majority of patients who lack a FLNA mutation. We previously also described a patient with a de novo variant in TAB2, which we hypothesized was causative of another form of AD-FMD. In this study, a cohort of 20 individuals with AD-FMD is clinically evaluated...
May 12, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28463157/histologic-appearance-after-preoperative-radiation-therapy-for-soft-tissue-sarcoma-assessment-of-the-european-organization-for-research-and-treatment-of-cancer-soft-tissue-and-bone-sarcoma-group-response-score
#5
Inga-Marie Schaefer, Jason L Hornick, Constance M Barysauskas, Chandrajit P Raut, Sagar A Patel, Trevor J Royce, Christopher D M Fletcher, Elizabeth H Baldini
PURPOSE: To critically assess the prognostic value of the European Organization for Research and Treatment of Cancer-Soft Tissue and Bone Sarcoma Group (EORTC-STBSG) response score and define histologic appearance after preoperative radiation therapy (RT) for soft tissue sarcoma (STS). METHODS AND MATERIALS: For a cohort of 100 patients with STS of the extremity/trunk treated at our institution with preoperative RT followed by resection, 2 expert sarcoma pathologists evaluated the resected specimens for percent residual viable cells, necrosis, hyalinization/fibrosis, and infarction...
June 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28462517/learning-from-redd-a-response-to-fletcher-et-al
#6
Arild Angelsen, Maria Brockhaus, Amy E Duchelle, Anne Larson, Christopher Martius, William D Sunderlin, Louis Verchot, Grace Wong, Sven Wunder
No abstract text is available yet for this article.
June 2017: Conservation Biology: the Journal of the Society for Conservation Biology
https://www.readbyqxmd.com/read/28368924/smarcb1-ini1-loss-in-epithelioid-schwannoma-a-clinicopathologic-and-immunohistochemical-study-of-65-cases
#7
Vickie Y Jo, Christopher D M Fletcher
The epithelioid variant of schwannoma is rare, and loss of SMARCB1/INI1 expression has been observed in a subset of cases. Our aim was to further define the clinicopathologic features and to evaluate SMARCB1/INI1 deficiency in a large cohort of 65 epithelioid schwannomas diagnosed between 2002 and 2015, which consisted of 32 men and 33 women with median age at diagnosis of 45 years (range, 13 to 75 y). Most tumors arose in the extremities (upper, 20, lower, 15) and trunk (17); 9 were visceral (8 gastrointestinal)...
March 31, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28346326/sarcomas-with-cic-rearrangements-are-a-distinct-pathologic-entity-with-aggressive-outcome-a-clinicopathologic-and-molecular-study-of-115-cases
#8
Cristina R Antonescu, Adepitan A Owosho, Lei Zhang, Sonja Chen, Kemal Deniz, Joseph M Huryn, Yu-Chien Kao, Shih-Chiang Huang, Samuel Singer, William Tap, Inga-Marie Schaefer, Christopher D Fletcher
CIC-DUX4 gene fusion, resulting from either a t(4;19) or t(10;19) translocation, is the most common genetic abnormality detected in EWSR1-negative small blue round cell tumors. Following their discovery it was debated if these tumors should be classified as variants of Ewing sarcoma (ie, atypical Ewing sarcoma) or as a stand-alone pathologic entity. As such the WHO classification temporarily grouped the CIC-rearranged tumors under undifferentiated sarcomas with round cell phenotype, until further clinical evidence was available...
March 24, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28337592/head-and-neck-round-cell-sarcomas-a-comparative-clinicopathologic-analysis-of-2-molecular-subsets-ewing-and-cic-rearranged-sarcomas
#9
Adepitan A Owosho, Cherry L Estilo, Joseph M Huryn, Lei Zhang, Christopher D M Fletcher, Cristina R Antonescu
CIC-rearranged sarcoma (CRS) is a relatively new entity defined by its pathognomonic genetic signature and undifferentiated round cell phenotype, initially grouped together with the 'Ewing sarcoma-like tumors'. However, increasing data suggest that these tumors should be regarded as a stand-alone pathologic entity. We conducted a clinicopathologic analysis on molecularly conformed Ewing sarcoma (ES) and CRS arising in the head and neck (HN) and compared to a well characterized cohort of ES and CRS from other locations...
March 23, 2017: Head and Neck Pathology
https://www.readbyqxmd.com/read/28292859/-18-f-fluoride-and-18-f-fluorodeoxyglucose-positron-emission-tomography-after-transient-ischemic-attack-or-minor-ischemic-stroke-case-control-study
#10
COMPARATIVE STUDY
Alex T Vesey, William S A Jenkins, Agnese Irkle, Alastair Moss, Greg Sng, Rachael O Forsythe, Tim Clark, Gemma Roberts, Alison Fletcher, Christophe Lucatelli, James H F Rudd, Anthony P Davenport, Nicholas L Mills, Rustam Al-Shahi Salman, Martin Dennis, William N Whiteley, Edwin J R van Beek, Marc R Dweck, David E Newby
BACKGROUND: Combined positron emission tomography (PET) and computed tomography (CT) can assess both anatomy and biology of carotid atherosclerosis. We sought to assess whether (18)F-fluoride or (18)F-fluorodeoxyglucose can identify culprit and high-risk carotid plaque. METHODS AND RESULTS: We performed (18)F-fluoride and (18)F-fluorodeoxyglucose PET/CT in 26 patients after recent transient ischemic attack or minor ischemic stroke: 18 patients with culprit carotid stenosis awaiting carotid endarterectomy and 8 controls without culprit carotid atheroma...
March 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28270683/max-inactivation-is-an-early-event-in-gist-development-that-regulates-p16-and-cell-proliferation
#11
Inga-Marie Schaefer, Yuexiang Wang, Cher-Wei Liang, Nacef Bahri, Anna Quattrone, Leona Doyle, Adrian Mariño-Enríquez, Alexandra Lauria, Meijun Zhu, Maria Debiec-Rychter, Susanne Grunewald, Jaclyn F Hechtman, Armelle Dufresne, Cristina R Antonescu, Carol Beadling, Ewa T Sicinska, Matt van de Rijn, George D Demetri, Marc Ladanyi, Christopher L Corless, Michael C Heinrich, Chandrajit P Raut, Sebastian Bauer, Jonathan A Fletcher
KIT, PDGFRA, NF1 and SDH mutations are alternate initiating events, fostering hyperplasia in gastrointestinal stromal tumours (GISTs), and additional genetic alterations are required for progression to malignancy. The most frequent secondary alteration, demonstrated in ∼70% of GISTs, is chromosome 14q deletion. Here we report hemizygous or homozygous inactivating mutations of the chromosome 14q MAX gene in 16 of 76 GISTs (21%). We find MAX mutations in 17% and 50% of sporadic and NF1-syndromic GISTs, respectively, and we find loss of MAX protein expression in 48% and 90% of sporadic and NF1-syndromic GISTs, respectively, and in three of eight micro-GISTs, which are early GISTs...
March 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/28248815/recurrent-srf-rela-fusions-define-a-novel-subset-of-cellular-myofibroma-myopericytoma-a-potential-diagnostic-pitfall-with-sarcomas-with-myogenic-differentiation
#12
Cristina R Antonescu, Yun-Shao Sung, Lei Zhang, Narasimhan P Agaram, Christopher D Fletcher
Cellular myofibroblastic tumors other than desmoid-type fibromatosis are often diagnostically challenging due to their relative rarity, lack of known genetic abnormalities, and expression of muscle markers which may be confused with sarcomas with myogenic differentiation. In this study we investigate the molecular alterations of a group of cellular myofibroblastic lesions with in the myofibroma and myopericytoma spectrum for better subclassification. Two index cases were studied by paired-end RNA sequencing for potential fusion gene discovery...
May 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28196207/correlation-of-long-term-results-of-imatinib-in-advanced-gastrointestinal-stromal-tumors-with-next-generation-sequencing-results-analysis-of-phase-3-swog-intergroup-trial-s0033
#13
Michael Heinrich, Cathryn Rankin, Charles D Blanke, George D Demetri, Ernest C Borden, Christopher W Ryan, Margaret von Mehren, Martin E Blackstein, Dennis A Priebat, William D Tap, Robert G Maki, Christopher L Corless, Jonathan A Fletcher, Kouros Owzar, John J Crowley, Robert S Benjamin, Laurence H Baker
Importance: After identification of activating mutations of the KIT gene in gastrointestinal stromal tumor (GIST)-the most common sarcomaof the gastrointestinal tract-a phase 2 study demonstrated efficacy of imatinib mesylate in patients with metastatic GIST harboring a KIT exon 11 mutation. Initial results of long-term follow-up have found a survival benefit in this subgroup of patients. Obective: To assess the long-term survival of patients with GIST who were treated in SWOG study S0033 and to present new molecular data regarding treatment outcomes...
February 9, 2017: JAMA Oncology
https://www.readbyqxmd.com/read/28152822/the-value-of-secondary-pathology-review
#14
Tinisha L Mayo, Tracy E Spinks, Richard Cheney, Peiguo Chu, Harry S Cooper, Suzanne Dintzis, Hormoz Ehya, Christopher D Fletcher, Amy Gerwirtz, Anthony Martin Magliocco, Sue Ellen Martin, Andrew E Rosenberg, Andy Sherrod, Lee K Tan, Brent L Wood, Ronald Stewart Walters
6 Background: Improving the value of cancer care is a major focus for the Alliance of Dedicated Cancer Centers (ADCC). Looking to align with the Institute of Medicine's (IOM) initiative to "Develop and deploy approaches to identify, learn from, and reduce diagnostic errors and near misses in clinical practice," the ADCC implemented a study to examine the clinical impact of expert secondary pathology review. The goal of this project was to: 1) demonstrate the value of secondary review of outside pathological specimens by ADCC subspecialty pathologists in identifying significant errors that can potentially impact treatment; and 2) create an opportunity to improve patient cancer care...
March 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28138155/corrigendum-mutations-in-snord118-cause-the-cerebral-microangiopathy-leukoencephalopathy-with-calcifications-and-cysts
#15
Emma M Jenkinson, Mathieu P Rodero, Paul R Kasher, Carolina Uggenti, Anthony Oojageer, Laurence C Goosey, Yoann Rose, Christopher J Kershaw, Jill E Urquhart, Simon G Williams, Sanjeev S Bhaskar, James O'Sullivan, Gabriela M Baerlocher, Monika Haubitz, Geraldine Aubert, Kristin W Barañano, Angela J Barnicoat, Roberta Battini, Andrea Berger, Edward M Blair, Janice E Brunstrom-Hernandez, Johannes A Buckard, David M Cassiman, Rosaline Caumes, Duccio M Cordelli, Liesbeth M De Waele, Alexander J Fay, Patrick Ferreira, Nicholas A Fletcher, Alan E Fryer, Himanshu Goel, Cheryl A Hemingway, Marco Henneke, Imelda Hughes, Rosalind J Jefferson, Ram Kumar, Lieven Lagae, Pierre G Landrieu, Charles M Lourenço, Timothy J Malpas, Sarju G Mehta, Imke Metz, Sakkubai Naidu, Katrin Õunap, Axel Panzer, Prab Prabhakar, Gerardine Quaghebeur, Raphael Schiffmann, Elliott H Sherr, Kanaga R Sinnathuray, Calvin Soh, Helen S Stewart, John Stone, Hilde Van Esch, Christine E G Van Mol, Adeline Vanderver, Emma L Wakeling, Andrea Whitney, Graham D Pavitt, Sam Griffiths-Jones, Gillian I Rice, Patrick Revy, Marjo S van der Knaap, John H Livingston, Raymond T O'Keefe, Yanick J Crow
No abstract text is available yet for this article.
January 31, 2017: Nature Genetics
https://www.readbyqxmd.com/read/28092203/machine-learning-of-three-dimensional-right-ventricular-motion-enables-outcome-prediction-in-pulmonary-hypertension-a-cardiac-mr-imaging-study
#16
Timothy J W Dawes, Antonio de Marvao, Wenzhe Shi, Tristan Fletcher, Geoffrey M J Watson, John Wharton, Christopher J Rhodes, Luke S G E Howard, J Simon R Gibbs, Daniel Rueckert, Stuart A Cook, Martin R Wilkins, Declan P O'Regan
Purpose To determine if patient survival and mechanisms of right ventricular failure in pulmonary hypertension could be predicted by using supervised machine learning of three-dimensional patterns of systolic cardiac motion. Materials and Methods The study was approved by a research ethics committee, and participants gave written informed consent. Two hundred fifty-six patients (143 women; mean age ± standard deviation, 63 years ± 17) with newly diagnosed pulmonary hypertension underwent cardiac magnetic resonance (MR) imaging, right-sided heart catheterization, and 6-minute walk testing with a median follow-up of 4...
May 2017: Radiology
https://www.readbyqxmd.com/read/28032662/5-hydroxymethylcytosine-is-a-nuclear-biomarker-to-assess-biological-potential-in-histologically-ambiguous-heavily-pigmented-melanocytic-neoplasms
#17
Jonathan J Lee, Ricardo E Vilain, Scott R Granter, Nina R Hu, Scott C Bresler, Shuyun Xu, Alexander H Frank, Martin C Mihm, Robyn P M Saw, Christopher D Fletcher, Richard A Scolyer, George F Murphy, Christine G Lian
BACKGROUND: 5-Hydroxymethylcytosine (5-hmC) is an epigenetic marker detectable through immunohistochemistry (IHC) that has been shown to distinguish benign nevi from melanoma with high sensitivity and specificity. The purpose of the study was to explore its diagnostic utility in a subset of histologically challenging, heavily pigmented cutaneous melanocytic neoplasms. METHODS: 5-hmC IHC was performed on 54 heavily pigmented melanocytic tumors. Semi-quantitative analysis of immunoreactivity was correlated with clinical, pathologic and follow-up data...
December 29, 2016: Journal of Cutaneous Pathology
https://www.readbyqxmd.com/read/28009608/fosb-is-a-useful-diagnostic-marker-for-pseudomyogenic-hemangioendothelioma
#18
Yin P Hung, Christopher D M Fletcher, Jason L Hornick
Pseudomyogenic (epithelioid sarcoma-like) hemangioendothelioma is a distinctive vascular neoplasm of intermediate biological potential with a predilection for young adults and frequent multifocal presentation. Pseudomyogenic hemangioendothelioma is characterized by loose fascicles of plump spindled and epithelioid cells with abundant eosinophilic cytoplasm and coexpression of keratins and endothelial markers. Recently, a SERPINE1-FOSB fusion has been identified as a consistent genetic alteration in pseudomyogenic hemangioendothelioma...
May 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/27998625/a-consensus-driven-agenda-for-emergency-medicine-firearm-injury-prevention-research
#19
Megan L Ranney, Jonathan Fletcher, Harrison Alter, Christopher Barsotti, Vikhyat S Bebarta, Marian E Betz, Patrick M Carter, Magdalena Cerdá, Rebecca M Cunningham, Peter Crane, Jahan Fahimi, Matthew J Miller, Ali Rowhani-Rahbar, Jody A Vogel, Garen J Wintemute, Muhammad Waseem, Manish N Shah
STUDY OBJECTIVE: To identify critical emergency medicine-focused firearm injury research questions and develop an evidence-based research agenda. METHODS: National content experts were recruited to a technical advisory group for the American College of Emergency Physicians Research Committee. Nominal group technique was used to identify research questions by consensus. The technical advisory group decided to focus on 5 widely accepted categorizations of firearm injury...
February 2017: Annals of Emergency Medicine
https://www.readbyqxmd.com/read/27927700/cardiac-%C3%AE-v%C3%AE-3-integrin-expression-following-acute-myocardial-infarction-in-humans
#20
William S A Jenkins, Alex T Vesey, Colin Stirrat, Martin Connell, Christophe Lucatelli, Anoushka Neale, Catriona Moles, Anna Vickers, Alison Fletcher, Tania Pawade, Ian Wilson, James H F Rudd, Edwin J R van Beek, Saeed Mirsadraee, Marc R Dweck, David E Newby
OBJECTIVE: Maladaptive repair contributes towards the development of heart failure following myocardial infarction (MI). The αvβ3 integrin receptor is a key mediator and determinant of cardiac repair. We aimed to establish whether αvβ3 integrin expression determines myocardial recovery following MI. METHODS: (18)F-Fluciclatide (a novel αvβ3-selective radiotracer) positron emission tomography (PET) and CT imaging and gadolinium-enhanced MRI (CMR) were performed in 21 patients 2 weeks after ST-segment elevation MI (anterior, n=16; lateral, n=4; inferior, n=1)...
April 2017: Heart: Official Journal of the British Cardiac Society
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