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https://www.readbyqxmd.com/read/27921459/investigation-of-the-derivatization-conditions-for-gc-ms-metabolomics-of-biological-samples
#1
Georgios Moros, Anastasia Chrysovalantou Chatziioannou, Helen G Gika, Nikolaos Raikos, Georgios Theodoridis
AIM: Metabolomics applications represent an emerging field where significant efforts are directed. Derivatization consists prerequisite for GC-MS metabolomics analysis. METHODS: Common silylation agents were tested for the derivatization of blood plasma. Optimization of methoxyamination and silylation reactions was performed on a mixture of reference standards, consisting of 46 different metabolites. Stability of derivatized metabolites was tested at 4°C. RESULTS: Optimum results were achieved using N-methyl-N-(trimethylsilyl)trifluoroacetamide...
January 2017: Bioanalysis
https://www.readbyqxmd.com/read/27921457/impact-of-exercise-on-fecal-and-cecal-metabolome-over-aging-a-longitudinal-study-in-rats
#2
Olga Deda, Helen Gika, Theodoros Panagoulis, Ioannis Taitzoglou, Nikolaos Raikos, Georgios Theodoridis
AIM: Physical exercise can reduce adverse conditions during aging, while both exercise and aging act as metabolism modifiers. The present study investigates rat fecal and cecal metabolome alterations derived from exercise during rats' lifespan. METHODS & RESULTS: Groups of rats trained life-long or for a specific period of time were under study. The training protocol consisted of swimming, 15-18 min per day, 3-5 days per week, with load of 4-0% of rat's weight. Fecal samples and cecal extracts were analyzed by targeted and untargeted metabolic profiling methods (GC-MS and LC-MS/MS)...
January 2017: Bioanalysis
https://www.readbyqxmd.com/read/27920827/catheter-ablation-of-anteroseptal-accessory-pathways-from-the-aortic-cusps-a-case-series-and-a-review-of-the-literature
#3
REVIEW
Konstantinos P Letsas, Michael Efremidis, Konstantinos Vlachos, Stamatis Georgopoulos, Nikolaos Karamichalakis, Athanasios Saplaouras, Sotirios Xydonas, Kosmas Valkanas, Antonios Sideris
Data regarding catheter ablation of anteroseptal accessory pathways through the aortic cusps are limited. We describe two cases of true para-Hisian accessory pathways successfully ablated from the aortic cusps (right coronary cusp and non-coronary cusp, respectively) along with a review of the current literature. Due to the close proximity to the atrioventricular node and the high risk of complication, mapping of the aortic cusps should always be considered in the case of anteroseptal accessory pathways. Anteroseptal accessory pathways can be safely and effectively ablated from the aortic cusps with good long-term outcomes...
December 2016: Journal of Arrhythmia
https://www.readbyqxmd.com/read/27920625/a-retrospective-analysis-of-toxicity-and-efficacy-for-2-hypofractionated-irradiation-schedules-versus-a-conventional-one-for-post-mastectomy-adjuvant-radiotherapy-in-breast-cancer
#4
Vassilis Kouloulias, Eftychia Mosa, Anna Zygogianni, Efrosini Kypraiou, John Georgakopoulos, Kalliopi Platoni, Christos Antypas, George Kyrgias, Maria Tolia, Christos Papadimitriou, Amanda Psyrri, George Patatoukas, Maria Dilvoi, Christina Armpilia, Kyriaki Theodorou, Maria-Aggeliki Kalogeridi, Ivelina Beli, John Kouvaris, Nikolaos Kelekis
INTRODUCTION: The aim of this analysis was a retrospective evaluation of the efficacy and toxicity of 2 hypofractionated irradiation schedules compared to conventional therapy in post-mastectomy patients. METHODS: 3 irradiation schedules were analyzed: 48.30 Gy in 21 fractions (group A, n = 60), 42.56 Gy in 16 fractions (group B, n = 27) and 50 Gy in 25 fractions (group C, n = 30) of the front chest wall. All groups were also treated with a supraclavicular field, with 39...
October 2016: Breast Care
https://www.readbyqxmd.com/read/27916360/combined-resection-and-rfa-in-colorectal-liver-metastases-stratification-of-long-term-outcomes
#5
Kazunari Sasaki, Georgios A Margonis, Nikolaos Andreatos, Yuhree Kim, Ana Wilson, Faiz Gani, Neda Amini, Timothy M Pawlik
BACKGROUND: Combined hepatic resection and radiofrequency ablation (resection-RFA) is a widely accepted multidisciplinary treatment for unresectable colorectal cancer liver metastases. Worse prognosis after resection-RFA is correlated to tumor morphology, although unfavorable morphology is inherent to this patient cohort. This study aimed to select patients who may or may not benefit from resection-RFA with the aid of tumor biology. METHOD: Data from 485 patients who underwent curative hepatectomy with or without concurrent RFA were retrospectively collected and analyzed...
November 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27913357/introducing-a-stable-bootstrap-validation-framework-for-reliable-genomic-signature-extraction
#6
Nikolaos-Kosmas Chlis, Ekaterini S Bei, Michael Zervakis
The application of machine learning methods for the identification of candidate genes responsible for phenotypes of interest, such as cancer, is a major challenge in the field of bioinformatics. These lists of genes are often called genomic signatures and their linkage to phenotype associations may form a significant step in discovering the causation between genotypes and phenotypes. Traditional methods that produce genomic signatures from DNA Microarray data tend to extract significantly different lists under relatively small variations of the training data...
November 29, 2016: IEEE/ACM Transactions on Computational Biology and Bioinformatics
https://www.readbyqxmd.com/read/27910711/endometrial-injury-for-rif-patients-undergoing-ivf-icsi-a-prospective-nonrandomized-controlled-trial
#7
Charalampos Siristatidis, Maria Kreatsa, Nikoleta Koutlaki, George Galazios, Vasileios Pergialiotis, Nikolaos Papantoniou
To evaluate the effect of endometrial injury on clinical outcomes in subfertile women with repeated implantation failures (RIF) undergoing assisted reproduction. In this prospective nonrandomized controlled trial, 103 subfertile women with RIF were included. Fifty-one underwent endometrial injury through hysteroscopy in the early follicular phase of the previous cycle and 52 underwent the standard protocol without any intervention. Live birth and miscarriage were the primary outcomes. Clinical and in vitro fertilization (IVF) cycle characteristics, were also compared between groups...
December 2, 2016: Gynecological Endocrinology
https://www.readbyqxmd.com/read/27909879/investigating-vaginal-bleeding-in-postmenopausal-women-found-to-have-an-endometrial-thickness-of-equal-to-or-greater-than-10%C3%A2-mm-on-ultrasonography
#8
Hilary L Turnbull, Nikolaos Akrivos, Paul Simpson, Timothy J Duncan, Joaquin J Nieto, Nikolaos Burbos
PURPOSE: This aim of this study is to determine the risk of endometrial cancer in symptomatic postmenopausal women, when endometrial thickness on transvaginal ultrasonography is equal to or greater than 10 mm, and subsequent office-based endometrial sampling histology is negative. METHODS: This is a prospective cross-sectional study, performed in a gynaecological oncology centre in the United Kingdom between February 2008 and July 2012. All postmenopausal women presenting with vaginal bleeding were investigated using transvaginal ultrasonography...
December 1, 2016: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/27909531/brugada-syndrome-risk-stratification-and-management
#9
REVIEW
Konstantinos P Letsas Md Fesc, Stamatis Georgopoulos Md, Konstantinos Vlachos Md, Nikolaos Karamichalakis Md, Ioannis Liatakis Md, Panagiotis Korantzopoulos Md PhD, Tong Liu Md PhD, Michael Efremidis Md, Antonios Sideris Md
The Brugada syndrome (BrS) is an arrhythmogenic disease associated with an increased risk of ventricular fibrillation and sudden cardiac death. The risk stratification and management of BrS patients, particularly of asymptomatic ones, still remains challenging. A previous history of aborted sudden cardiac death or arrhythmic syncope in the presence of spontaneous type 1 ECG pattern of BrS phenotype appear to be the most reliable predictors of future arrhythmic events. Several other ECG parameters have been proposed for risk stratification...
August 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27908804/custom-made-conical-endograft-in-the-treatment-of-saccular-abdominal-aortic-aneurysms-with-tight-and-calcified-distal-neck-thinking-out-of-the-box
#10
Efstratios Georgakarakos, Christos Argyriou, Nikolaos Schoretsanitis, George S Georgiadis
PURPOSE: to describe the use of the combination of a conical custom-made TREO® (TREO CM) stent-graft in the treatment of a saccular abdominal aortic endograft (AAA) with long but tight and calcified distal neck. TECHNIQUE: A 65-year female patient was treated for a saccular 5.2 cm AAA with a 3cm-long but calcified and tight (16mm) distal neck, precluding the safe use of a bifurcated endograft. Since the patient refused an open surgery, a conical TREO CM endograft was manufactured with 20% proximal oversizing, whereas the 3cm caudal sealing segment demonstrated a conical configuration comprised of a 2cm and 1cm nitinol-supported zones of 20% and 10% oversizing, respectively, in order to avoid excessive strain and incomplete expand at the most distal calcified area, leading ultimately to an insidious infolding and consequent type Ib endoleak...
November 28, 2016: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/27908456/wastewater-based-epidemiology-to-assess-human-exposure-to-pyrethroid-pesticides
#11
Nikolaos I Rousis, Ettore Zuccato, Sara Castiglioni
Pesticides are active substances with potentially adverse effects on human health, and therefore great effort is addressed to study the relation between their widespread use and the effects on humans. To track human exposure to pesticides, novel approaches are needed to give additional information on exposure at population level. In this study, a novel application of Wastewater-Based Epidemiology (WBE) was developed to measure the intake of pyrethroid pesticides in a population. Three human urinary metabolites of pyrethroids were selected and validated as biomarkers of exposure by evaluating their sources and stability in wastewater...
November 28, 2016: Environment International
https://www.readbyqxmd.com/read/27905066/a-multiscale-approach-to-the-migration-of-cancer-stem-cells-mathematical-modelling-and-simulations
#12
Nikolaos Sfakianakis, Niklas Kolbe, Nadja Hellmann, Mária Lukáčová-Medvid'ová
We propose a multiscale model for the invasion of the extracellular matrix by two types of cancer cells, the differentiated cancer cells and the cancer stem cells. We investigate the epithelial mesenchymal-like transition between them being driven primarily by the epidermal growth factors. We moreover take into account the transdifferentiation program of the cancer stem cells towards the cancer-associated fibroblast cells as well as the fibroblast-driven remodelling of the extracellular matrix. The proposed haptotaxis model combines the macroscopic phenomenon of the invasion of the extracellular matrix by both types of cancer cells with the microscopic dynamics of the epidermal growth factors...
November 30, 2016: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/27903668/malignant-pleural-mesothelioma-an-update-on-investigation-diagnosis-and-treatment
#13
Anna C Bibby, Selina Tsim, Nikolaos Kanellakis, Hannah Ball, Denis C Talbot, Kevin G Blyth, Nick A Maskell, Ioannis Psallidas
Malignant pleural mesothelioma is an aggressive malignancy of the pleural surface, predominantly caused by prior asbestos exposure. There is a global epidemic of malignant pleural mesothelioma underway, and incidence rates are predicted to peak in the next few years.This article summarises the epidemiology and pathogenesis of malignant pleural mesothelioma, before describing some key factors in the patient experience and outlining common symptoms. Diagnostic approaches are reviewed, including imaging techniques and the role of various biomarkers...
December 2016: European Respiratory Review: An Official Journal of the European Respiratory Society
https://www.readbyqxmd.com/read/27900797/evidence-for-feedback-regulation-following-cholesterol-lowering-therapy-in-a-prostate-cancer-xenograft-model
#14
Elizabeth M Masko, Mahmoud A Alfaqih, Keith R Solomon, William T Barry, Christopher B Newgard, Michael J Muehlbauer, Nikolaos A Valilis, Tameika E Phillips, Susan H Poulton, Alexis R Freedland, Stephanie Sun, Shweta K Dambal, Sergio E Sanders, Everardo Macias, Michael R Freeman, Mark W Dewhirst, Salvatore V Pizzo, Stephen J Freedland
BACKGROUND: Epidemiologic data suggest cholesterol-lowering drugs may prevent the progression of prostate cancer, but not the incidence of the disease. However, the association of combination therapy in cholesterol reduction on prostate or any cancer is unclear. In this study, we compared the effects of the cholesterol lowering drugs simvastatin and ezetimibe alone or in combination on the growth of LAPC-4 prostate cancer in vivo xenografts. METHODS: Proliferation assays were conducted by MTS solution and assessed by Student's t-test...
November 30, 2016: Prostate
https://www.readbyqxmd.com/read/27900527/should-all-patients-with-arrhythmogenic-right-ventricular-dysplasia-cardiomyopathy-undergo-epicardial-catheter-ablation
#15
Andreas Müssigbrodt, Elena Efimova, Helge Knopp, Livio Bertagnolli, Nikolaos Dagres, Sergio Richter, Daniela Husser, Andreas Bollmann, Gerhard Hindricks, Arash Arya
BACKGROUND: Epicardial radiofrequency catheter ablation is currently considered as the therapeutic option of choice in patients with arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C) and recurrent ventricular tachycardia (VT). We hypothesised that inducibility of VT may guide the ablation strategy and thereby affect long-term results. Additional epicardial ablation was only performed if VT were still inducible after thorough endocardial ablation. METHODS: The objective was to examine an inducibility-guided ablation approach by comparing the long-term results between endocardial and epi-endocardial radiofrequency catheter ablation of VT in a large cohort of patients with ARVD/C...
November 30, 2016: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/27899247/association-of-plasma-fetuin-a-levels-with-peripheral-arterial-disease-and-lower-extremity-arterial-calcification-in-subjects-with-type-2-diabetes-mellitus
#16
Ioanna Eleftheriadou, Pinelopi Grigoropoulou, Alexander Kokkinos, Iordanis Mourouzis, Despoina Perrea, Nicholas Katsilambros, Petros P Sfikakis, Nikolaos Tentolouris
AIMS: Fetuin-A is a hepatic glycoprotein that is involved in insulin resistance and atherosclerosis. Herein we examined the association of plasma fetuin-A levels with peripheral arterial disease (PAD) in patients with type 2 diabetes mellitus (T2DM). MATERIAL AND METHODS: A total of 71 patients with T2DM and 57 non-diabetic individuals were recruited. Diagnosis of PAD was based on the absence of triphasic waveform at pedal arteries, while ankle-brachial index (ABI) was calculated...
November 12, 2016: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/27899140/transapical-transcatheter-aortic-valve-replacement-in-patients-with-or-without-prior-coronary-artery-bypass-graft-operation
#17
Konstantinos V Voudris, S Chiu Wong, Ryan Kaple, Polydoros N Kampaktsis, Andreas R de Biasi, Jonathan S Weiss, Richard Devereux, Karl Krieger, Luke Kim, Rajesh V Swaminathan, Dmitriy N Feldman, Harsimran Singh, Nikolaos J Skubas, Robert M Minutello, Geoffrey Bergman, Arash Salemi
BACKGROUND: Transapical approach (TA) is an established access alternative to the transfemoral technique in patients undergoing transcatheter aortic valve replacement (TAVR) for treatment of symptomatic aortic valve stenosis. The impact of prior coronary artery bypass grafting (CABG) on clinical outcomes in patients undergoing TA-TAVR is not well defined. METHODS: A single center retrospective cohort analysis of 126 patients (male 41%, mean age 85.8 ± 6.1 years) who underwent TA balloon expandable TAVR (Edwards SAPIEN, SAPIEN XT or SAPIEN 3) was performed...
November 29, 2016: Journal of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/27898186/human-papillomavirus-dna-detection-in-fine-needle-aspirates-as-indicator-of-human-papillomavirus-positive-oropharyngeal-squamous-cell-carcinoma-a-prospective-study
#18
Lars Sivars, David Landin, Linnea Haeggblom, Nikolaos Tertipis, Nathalie Grün, Cinzia Bersani, Linda Marklund, Mehran Ghaderi, Anders Näsman, Torbjörn Ramqvist, Cecilia Nordfors, Eva Munck-Wikland, Edneia Tani, Tina Dalianis
BACKGROUND: Human papillomavirus (HPV)-positive oropharyngeal squamous cell carcinoma (SCC) has a better outcome than most head neck squamous cell carcinomas (HNSCCs) and an HPV-positive lymph node metastasis likely has an HPV-positive oropharyngeal SCC origin. Determining HPV-status in cervical lymph nodes by fine-needle aspiration cytology (FNAC) may be useful for diagnosis. METHODS: FNACs from 66 patients with neck masses were prospectively examined for HPV DNA and HPV16 mRNA by a polymerase chain reaction (PCR)-based assay, and the data correlated to diagnosis and HPV-status obtained from histopathological specimens...
November 29, 2016: Head & Neck
https://www.readbyqxmd.com/read/27896243/profile-of-tivantinib-and-its-potential-in-the-treatment-of-hepatocellular-carcinoma-the-evidence-to-date
#19
REVIEW
Daniel Pievsky, Nikolaos Pyrsopoulos
Hepatocellular carcinoma (HCC) is the fastest rising cause of cancer-related death in the United States and carries a very poor prognosis, with a median survival time of <50% at 1 year for advanced disease. To date, sorafenib is the only therapy approved by the Food and Drug Administration for the treatment of advanced HCC. Tivantinib (ARQ-197), a non-ATP competitive inhibitor of cellular mesenchymal-epithelial transcription factor (c-MET), has shown a survival benefit in patients with advanced HCC who have failed or are intolerant to sorafenib in Phase I and II trials...
2016: Journal of Hepatocellular Carcinoma
https://www.readbyqxmd.com/read/27895815/molecular-predictive-markers-in-tumors-of-the-gastrointestinal-tract
#20
REVIEW
Eirini Papadopoulou, Vasiliki Metaxa-Mariatou, Georgios Tsaousis, Nikolaos Tsoulos, Angeliki Tsirigoti, Chrisoula Efstathiadou, Angela Apessos, Konstantinos Agiannitopoulos, Georgia Pepe, Eugenia Bourkoula, George Nasioulas
Gastrointestinal malignancies are among the leading causes of cancer-related deaths worldwide. Like all human malignancies they are characterized by accumulation of mutations which lead to inactivation of tumor suppressor genes or activation of oncogenes. Advances in Molecular Biology techniques have allowed for more accurate analysis of tumors' genetic profiling using new breakthrough technologies such as next generation sequencing (NGS), leading to the development of targeted therapeutical approaches based upon biomarker-selection...
November 15, 2016: World Journal of Gastrointestinal Oncology
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