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https://www.readbyqxmd.com/read/28414972/an-lc-ms-ms-method-for-quantification-of-ac0010-a-novel-mutant-selective-epidermal-growth-factor-receptor-egfr-inhibitor-and-its-metabolites-in-human-plasma-and-the-application-to-a-pharmacokinetic-study
#1
Lu Wang, Xin Zheng, Weicong Wang, Pei Hu, Ji Jiang
AC0010 is an irreversible, mutant-selective EGFR inhibitor that effectively inhibits EGFR active and T790M resistance mutations in non-small cell lung cancer (NSCLC). A sensitive ultra-performance liquid chromatography - tandem mass spectrometry (UPLC-MS/MS) method was developed and fully validated for determining AC0010 and its metabolites in human plasma. The samples were purified by solid-phase extraction (SPE) columns and separated on a BEH C18 column. Electrospray ionization (ESI) in positive ion mode and multiple reaction monitoring (MRM) were used to monitor the ion transitions of AC0010 (m/z 488→257) and its metabolites M1 (m/z 474→403), M2 (m/z 504→487), M4 (m/z 434→377), M7 (m/z 490→405), MII-1 (m/z 651→434) and MII-2 (m/z 609→434)...
March 28, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28409339/quantification-of-tumor-hypoxic-fractions-using-positron-emission-tomography-with-18-f-fluoromisonidazole-18-f-fmiso-kinetic-analysis-and-invasive-oxygen-measurements
#2
Olivia J Kelada, Sara Rockwell, Ming-Qiang Zheng, Yiyun Huang, Yanfeng Liu, Carmen J Booth, Roy H Decker, Uwe Oelfke, Richard E Carson, David J Carlson
PURPOSE: The purpose of this study is to use dynamic [(18)F]fluoromisonidazole ([(18)F]FMISO) positron emission tomography (PET) to compare estimates of tumor hypoxic fractions (HFs) derived by tracer kinetic modeling, tissue-to-blood ratios (TBR), and independent oxygen (pO2) measurements. PROCEDURES: BALB/c mice with EMT6 subcutaneous tumors were selected for PET imaging and invasive pO2 measurements. Data from 120-min dynamic [(18)F]FMISO scans were fit to two-compartment irreversible three rate constant (K 1, k 2, k 3) and Patlak models (K i)...
April 13, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/28408698/reproducibility-of-lobar-perfusion-and-ventilation-quantification-using-a-spect-ct-segmentation-software-in-lung-cancer-patients
#3
Karine Provost, Antoine Leblond, Annie Gauthier Lemire, Edith Fillion, Houda Bahig, Martin Lord
Planar perfusion scintigraphy with Tc99m-labelled macroaggregated albumin (Tc99m-MAA) is often used for pre-therapy quantification of regional lung perfusion in lung cancer patients, particularly in patients with poor respiratory function. However, subdividing lung parenchyma in rectangular regions of interests, as done on planar images, is a poor reflection of true lobar anatomy. New tridimensional methods using SPECT and SPECT/CT have been introduced, including a semi-automatic lung segmentation software (Hermes Medical Solutions)...
April 13, 2017: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/28401709/the-role-of-microrna-93-regulating-angiopoietin2-in-the-formation-of-malignant-pleural-effusion
#4
Qian Qian, Wenkui Sun, Wen Zhu, Yanan Liu, Ai Ge, Yuan Ma, Yu Zhang, Xiaoning Zeng, Mao Huang
The biological roles of miRNAs in the development of malignant pleural effusion (MPE) are unclear. In this study, the miRNA microarray analysis was performed in two different prognosis groups of lung adenocarcinoma patients. Expression profiles of miRNAs in MPEs were identified. With the help of quantification PCR, we confirmed the expression differences of miRNAs and further analyzed their biological functions and relative target genes in vitro. The target gene of miR-93 was estimated by online database, and also, the protein was tested...
April 11, 2017: Cancer Medicine
https://www.readbyqxmd.com/read/28396617/long-non-coding-rna-malat1-drives-gastric-cancer-progression-by-regulating-hmgb2-modulating-the-mir-1297
#5
Jijun Li, Jinghua Gao, Wen Tian, Yongsheng Li, Jinghua Zhang
BACKGROUND: Emerging evidences have verified that long non-coding RNAs (lncRNAs) play important regulatory roles in the pathogenesis and progression of cancers. lncRNAs metastasis associated lung adenocarcinoma transcript 1 (MALAT1) have been found to be up-regulated in some human cancers. The main objective of this study was to investigate the expression level and biological function of MALAT1 in gastric cancer (GC). METHODS: Quantificational real-time polymerase chain reaction (qRT-PCR) was performed to detect the mRNA levels of MALAT1 in 78 paired gastric carcinoma tissues and adjacent normal tissues, and the associations of MALAT1 expression with the clinicopathological features were analyzed, and the prognosis of gastric carcinoma patients was evaluated...
2017: Cancer Cell International
https://www.readbyqxmd.com/read/28392613/lung-nodule-volume-quantification-and-shape-differentiation-with-an-ultra-high-resolution-technique-on-a-photon-counting-detector-ct-system
#6
W Zhou, J Montoya, R Gutjahr, A Ferrero, A Halaweish, S Kappler, C McCollough, S Leng
A new ultra high-resolution (UHR) mode has been implemented on a whole body photon counting-detector (PCD) CT system. The UHR mode has a pixel size of 0.25 mm by 0.25 mm at the iso-center, while the conventional (macro) mode is limited to 0.5 mm by 0.5 mm. A set of synthetic lung nodules (two shapes, five sizes, and two radio-densities) was scanned using both the UHR and macro modes and reconstructed with 2 reconstruction kernels (4 sets of images in total). Linear regression analysis was performed to compare measured nodule volumes from CT images to reference volumes...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28388076/immunopet-imaging-of-ctla-4-expression-in-mouse-models-of-non-small-cell-lung-cancer
#7
Emily B Ehlerding, Christopher G England, Rebecca L Majewski, Hector F Valdovinos, Dawei Jiang, Glenn Liu, Douglas G McNeel, Robert J Nickles, Weibo Cai
Cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) is expressed on the surface of activated T cells and some tumor cells, and is the target of the clinically approved monoclonal antibody ipilimumab. In this study, we investigate specific binding of radiolabeled ipilimumab to CTLA-4 expressed by human non-small cell lung cancer cells in vivo using positron emission tomography (PET). Ipilimumab was radiolabeled with (64)Cu (t1/2 = 12.7 h) through the use of the chelator 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) to formulate (64)Cu-DOTA-ipilimumab...
April 12, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28387927/multimodal-lung-cancer-screening-using-the-italung-biomarker-panel-and-low-dose-computed-tomography-results-of-the-italung-biomarker-study
#8
Francesca Maria Carozzi, Simonetta Bisanzi, Laura Carrozzi, Fabio Falaschi, Andrea Lopes Pegna, Mario Mascalchi, Giulia Picozzi, Marco Peluso, Cristina Sani, Luana Greco, Cristina Ocello, Eugenio Paci
Asymptomatic high-risk subjects, randomized in the intervention arm of the ITALUNG trial (1406 screened for lung cancer), were enrolled for the ITALUNG biomarker study (n = 1356), in which samples of blood and sputum were analysed for plasma DNA quantification (cut off 5ng/ml), loss of heterozygosity and microsatellite instability. The ITALUNG biomarker panel (IBP) was considered positive if at least one of the two biomarkers included in the panel was positive. Subjects with and without lung cancer diagnosis at the end of the screening cycle with LDCT (n = 517) were evaluated...
April 7, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/28377578/role-of-cytochrome-p450-cyp-1a-in-hyperoxic-lung-injury-analysis-of-the-transcriptome-and-proteome
#9
Krithika Lingappan, Suman Maity, Weiwu Jiang, Lihua Wang, Xanthi Couroucli, Alex Veith, Guodong Zhou, Cristian Coarfa, Bhagavatula Moorthy
Hyperoxia contributes to lung injury in experimental animals and diseases such as acute respiratory distress syndrome in humans. Cytochrome P450 (CYP)1A enzymes are protective against hyperoxic lung injury (HLI). The molecular pathways and differences in gene expression that modulate these protective effects remain largely unknown. Our objective was to characterize genotype specific differences in the transcriptome and proteome of acute hyperoxic lung injury using the omics platforms: microarray and Reverse Phase Proteomic Array...
April 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28376262/the-effects-of-iterative-reconstruction-and-kernel-selection-on-quantitative-computed-tomography-measures-of-lung-density
#10
Alfonso Rodriguez, Frank N Ranallo, Philip F Judy, Sean B Fain
PURPOSE: To determine the effects of iterative reconstruction (IR) and high frequency kernels on quantitative computed tomography (qCT) density measures at reduced X-ray dose. MATERIALS AND METHODS: The COPDGene 2 Phantom (CTP 698, The Phantom Laboratory, Salem, NY) with four embedded lung mimicking foam densities (12lb, 20lb, and 4lb), as well as water, air, and acrylic reference inserts was imaged using a GE 64 slice CT750 HD scanner in helical mode with four current-time products ranging from 12-100 mAs...
April 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28375558/analysis-of-the-advantages-of-cis-reporters-in-optimized-facs-gal
#11
Miguel Ángel Sánchez-Luengo, Miguel Rovira, Manuel Serrano, Pablo Jose Fernandez-Marcos, Lola Martinez
Flow cytometry is a powerful multiparametric technology, widely used for the identification, quantification, and isolation of defined populations of cells based on the expression of target proteins. It also allows for the use of surrogate reporters, either enzymatic or fluorescent, to indirectly monitor the expression of these target proteins. In this work, we optimised the dissociation protocol for the detection of the enzymatic reporter LacZ using the FACS-Gal detection system with the fluorogenic substrate FDG to compare cis- versus trans-positioned reporters efficiency...
April 4, 2017: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
https://www.readbyqxmd.com/read/28370323/recombinant-cells-in-the-lung-increase-with-age-via-de-novo-recombination-events-and-clonal-expansion
#12
Takafumi Kimoto, Jennifer E Kay, Na Li, Bevin P Engelward
Homologous recombination (HR) is a critical DNA repair pathway, which is usually error-free, but can sometimes lead to cancer-promoting mutations. Despite the importance of HR as a driver of mutations, the spontaneous frequency of such mutations has proven difficult to study. To gain insight to location, cell type, and subsequent proliferation of mutated cells, we used the Rosa26 Direct Repeat (RaDR) mice for in situ detection and quantification of recombinant cells in the lung. We developed a method for automated enumeration of recombinant cells in lung tissue using the Metafer 4 slide-scanning platform...
April 2017: Environmental and Molecular Mutagenesis
https://www.readbyqxmd.com/read/28367434/mediator-complex-subunit-med1-protein-expression-is-decreased-during-bladder-cancer-progression
#13
Niklas Klümper, Isabella Syring, Wenzel Vogel, Doris Schmidt, Stefan C Müller, Jörg Ellinger, Zaki Shaikhibrahim, Johannes Brägelmann, Sven Perner
INTRODUCTION: Bladder cancer (BCa) is among the most frequent cancer entities and relevantly contributes to cancer-associated deaths worldwide. The multi-protein Mediator complex is a central regulator of the transcriptional machinery of protein-coding genes and has been described to be altered in several malignancies. MED1, a subunit of the tail module, was described to negatively modulate expression of metastasis-related genes and to be downregulated in melanoma and lung cancer. In contrast, MED1 hyperactivity was described in breast and prostate cancer, likely due its function as a hub for nuclear hormone receptors...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/28366212/a-new-configuration-for-bar-adsorptive-microextraction-ba%C3%AE-e-for-the-quantification-of-biomarkers-hexanal-and-heptanal-in-human-urine-by-hplc-providing-an-alternative-for-early-lung-cancer-diagnosis
#14
Anderson Luiz Oenning, Lucas Morés, Adriana Neves Dias, Eduardo Carasek
In this paper, a remodeling of the bar adsorptive microextraction (BAμE) technique is proposed with impregnation of the derivatization reagent on the surface of the adsorptive bar containing a biosorbent material. The derivatization reagent was 2,4-dinitrophenylhydrazine (DNPH), which was adsorbed on the surface of the bar containing cork powder as the extractor phase for the determination of two aldehydes (hexanal and heptanal) which are known as lung cancer biomarkers in human urine samples. The derivatization reaction and the extraction occurred simultaneously on the surface of the bar (length 7...
May 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28363113/the-attractor-recurrent-neural-network-based-on-fuzzy-functions-an-effective-model-for-the-classification-of-lung-abnormalities
#15
Mohammad Bagher Khodabakhshi, Mohammad Hassan Moradi
The respiratory system dynamic is of high significance when it comes to the detection of lung abnormalities, which highlights the importance of presenting a reliable model for it. In this paper, we introduce a novel dynamic modelling method for the characterization of the lung sounds (LS), based on the attractor recurrent neural network (ARNN). The ARNN structure allows the development of an effective LS model. Additionally, it has the capability to reproduce the distinctive features of the lung sounds using its formed attractors...
March 23, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28362408/in-vitro-imaging-and-quantification-of-the-drug-targeting-efficiency-of-fluorescently-labeled-gnrh-analogues
#16
József Murányi, Attila Varga, Bianka Gurbi, Pál Gyulavári, Gábor Mező, Tibor Vántus
GnRH analogues are effective targeting moieties and able to deliver anticancer agents selectively into malignant tumor cells which highly express GnRH receptors. However, the quantitative analysis of GnRH analogues' cellular uptake and the investigated cell types in GnRH-based drug delivery systems are currently limited. Previously introduced, selectively labeled fluorescent GnRH I, -II and -III derivatives provide great detectability, and they have suitable chemical properties for reproducible and robust experiments...
March 21, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28361177/chronic-thromboembolic-pulmonary-hypertension-evaluation-of-2d-perfusion-angiography-in-patients-who-undergo-balloon-pulmonary-angioplasty
#17
Sabine K Maschke, Julius Renne, Thomas Werncke, Karen M Olsson, Marius M Hoeper, Frank K Wacker, Bernhard C Meyer, Jan B Hinrichs
OBJECTIVE: To evaluate the feasibility of 2D-perfusion angiography (2D-PA) in order to quantify perfusion changes of the lung parenchyma pre- and post-balloon pulmonary angioplasty (BPA). METHODS: Thirty consecutive interventions in 16 patients with 99 treated pulmonary artery segments were included. To quantify changes in pulmonary blood flow using 2D-PA, the acquired digital subtraction angiographies (DSA) pre- and post-BPA were post-processed. A reference ROI in the treated pulmonary artery and a distal target ROI in the lung parenchyma were placed in corresponding areas on DSA pre- and post-BPA...
March 30, 2017: European Radiology
https://www.readbyqxmd.com/read/28358666/a-study-of-the-beam-specific-interplay-effect-in-proton-pencil-beam-scanning-delivery-in-lung-cancer
#18
Minglei Kang, Sheng Huang, Timothy D Solberg, Rulon Mayer, Andy Thomas, Boon-Keng Kevin Teo, James E McDonough, Charles B Simone, Liyong Lin
BACKGROUND: For lung tumors with large motion amplitudes, the use of proton pencil beam scanning (PBS) can produce large dose errors. In this study, we assess under what circumstances PBS can be used to treat lung cancer patients who exhibit large tumor motion, based on the quantification of tumor motion and the dose interplay. MATERIAL AND METHODS: PBS plans were optimized on average 4DCT datasets using a beam-specific PTV method for 10 consecutive patients with locally advanced non-small-cell-lung-cancer (NSCLC) treated with proton therapy to 6660/180 cGy...
April 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28352869/biophysical-isolation-and-identification-of-circulating-tumor-cells
#19
James Che, Victor Yu, Edward B Garon, Jonathan W Goldman, Dino Di Carlo
Isolation and enumeration of circulating tumor cells (CTCs) from blood is important for determining patient prognosis and monitoring treatment. Methods based on affinity to cell surface markers have been applied to both purify (via immunoseparation) and identify (via immunofluorescence) CTCs. However, variability of cell biomarker expression associated with tumor heterogeneity and evolution and cross-reactivity of antibody probes have long complicated CTC enrichment and immunostaining. Here, we report a truly label-free high-throughput microfluidic approach to isolate, enumerate, and characterize the biophysical properties of CTCs using an integrated microfluidic device...
April 11, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28339127/quantitative-ultrasound-texture-analysis-for-differentiating-preterm-from-term-fetal-lungs
#20
Sleiman R Ghorayeb, Luis A Bracero, Matthew J Blitz, Zara Rahman, Martin L Lesser
OBJECTIVES: To differentiate preterm (<37 weeks' gestation) from term (≥37 weeks' gestation) fetal lungs by using quantitative texture analysis of ultrasound images. METHODS: This study retrospectively evaluated singleton gestations with valid dating at 20 weeks' gestational age (GA) or later between January 2015 and December 2015. Images were obtained from Voluson E8 ultrasound systems (GE Healthcare, Milwaukee, WI). A region of interest was selected in each fetal lung image at the level of the 4 heart chambers from an area that appeared most representative of the overall lung tissue and had the least shadow...
March 24, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
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