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Clinical Chemistry

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https://www.readbyqxmd.com/read/28100495/probe-free-digital-pcr-quantitative-methodology-to-measure-donor-specific-cell-free-dna-after-solid-organ-transplantation
#1
Su Kah Goh, Vijayaragavan Muralidharan, Christopher Christophi, Hongdo Do, Alexander Dobrovic
BACKGROUND: Donor-specific cell-free DNA (dscfDNA) is increasingly being considered as a noninvasive biomarker to monitor graft health and diagnose graft rejection after solid-organ transplantation. However, current approaches used to measure dscfDNA can be costly and/or laborious. A probe-free droplet digital PCR (ddPCR) methodology using small deletion/insertion polymorphisms (DIPs) was developed to circumvent these limitations without compromising the quantification of dscfDNA. This method was called PHABRE-PCR (Primer to Hybridize across an Allelic BREakpoint-PCR)...
January 18, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28100494/quantification-of-bk-virus-standards-by-quantitative-real-time-pcr-and-droplet-digital-pcr-is-confounded-by-multiple-virus-populations-in-the-who-bkv-international-standard
#2
Allen C Bateman, Alexander L Greninger, Ederlyn E Atienza, Ajit P Limaye, Keith R Jerome, Linda Cook
BACKGROUND: The WHO recently released a BK virus (BKV) international standard. This study evaluated the WHO international standard and commercially available BKV standards by quantitative real-time PCR (qPCR) and droplet digital PCR (ddPCR). METHODS: WHO, Exact Diagnostics, Acrometrix, and Zeptometrix BKV standards were tested by qPCR and ddPCR. Two preparations of NIST BKV clones were also tested. Nucleic acid was extracted with the Roche MP96 and MPLC, followed by quantification in duplicate...
January 18, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28087583/retrospective-accuracy-study-of-point-of-care-hemoglobin-a1c-in-field-conditions
#3
LETTER
David M Manthei, Nicholas Wesener, Denise Twarkowski, Donald A Giacherio, Lee F Schroeder
No abstract text is available yet for this article.
January 13, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28087582/driving-under-the-influence-of-drugs-looking-for-reasonable-blood-cutoffs-and-realistic-analytical-values
#4
LETTER
Francesco Paolo Busardò, Simona Pichini, Roberta Pacifici
No abstract text is available yet for this article.
January 13, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28082463/the-ubiquitous-existence-of-microrna-in-body-fluids
#5
Kai Wang
No abstract text is available yet for this article.
January 12, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28077442/miniaturized-nanopore-dna-sequencing-accelerating-the-path-to-precision-medicine
#6
Linnea M Baudhuin, Matthew J Ferber
No abstract text is available yet for this article.
January 11, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28073902/state-of-harmonization-of-24-serum-albumin-measurement-procedures-and-implications-for-medical-decisions
#7
Lorin M Bachmann, Min Yu, James C Boyd, David E Bruns, W Greg Miller
BACKGROUND: Measurements of serum and plasma albumin are widely used in medicine, including as indicators of quality of patient care in renal dialysis centers. METHODS: Pools were prepared from residual patient serum (n = 50) and heparin plasma (n = 48) from patients without renal disease, and serum from patients with kidney failure before hemodialysis (n = 53). Albumin was measured in all samples and in ERM-DA470k/IFCC reference material (RM) by 3 immunochemical, 9 bromcresol green (BCG), and 12 bromcresol purple (BCP) methods...
January 10, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28073901/cardiac-troponin-t-smaller-molecules-in-patients-with-end-stage-renal-disease-than-after-onset-of-acute-myocardial-infarction
#8
Alma M A Mingels, Eline P M Cardinaels, Natascha J H Broers, Anneke van Sleeuwen, Alexander S Streng, Marja P van Dieijen-Visser, Jeroen P Kooman, Otto Bekers
BACKGROUND: We have found previously that in acute myocardial infarction (AMI), cardiac troponin T (cTnT) is degraded in a time-dependent pattern. We investigated whether cTnT forms differed in patients with chronic cTnT increases, as seen with renal dysfunction, from those in the acute phase of myocardial infarction. METHODS: We separated cTnT forms by gel filtration chromatography (GFC) in end-stage renal disease (ESRD) patients: prehemodialysis (pre-HD) and post-HD (n = 10) and 2 months follow-up (n = 6)...
January 10, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28073900/the-longer-the-better-an-empirical-study-of-the-extent-and-mechanisms-of-attenuating-biomarker-associations-in-cardiovascular-patient-cohorts
#9
Lutz P Breitling, Ute Mons, Harry Hahmann, Wolfgang Koenig, Dietrich Rothenbacher, Hermann Brenner
BACKGROUND: Identifying novel risk markers in cardiovascular patients remains a research priority. Longer follow-up generally is considered favorable in such studies, but associations of interest may become attenuated with increasing follow-up. This issue has not been adequately addressed in the context of patient cohorts. The current study analyzed the extent and mechanisms of attenuating associations in a cardiovascular patient cohort. METHODS: The associations of numerous biomarkers with all-cause mortality were estimated by multiple Cox regression in the Langzeiterfolge der KARdiOLogischen Anschlussheilbehandlung (KAROLA) prospective cohort study of 1204 patients who had participated in an inpatient rehabilitation program after an acute coronary syndrome (ACS) or coronary bypass operation...
January 10, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28073899/paper-based-microrna-expression-profiling-from-plasma-and-circulating-tumor-cells
#10
Sai Mun Leong, Karen Mei-Ling Tan, Hui Wen Chua, Mo-Chao Huang, Wai Chye Cheong, Mo-Huang Li, Steven Tucker, Evelyn Siew-Chuan Koay
BACKGROUND: Molecular characterization of circulating tumor cells (CTCs) holds great promise for monitoring metastatic progression and characterizing metastatic disease. However, leukocyte and red blood cell contamination of routinely isolated CTCs makes CTC-specific molecular characterization extremely challenging. METHODS: Here we report the use of a paper-based medium for efficient extraction of microRNAs (miRNAs) from limited amounts of biological samples such as rare CTCs harvested from cancer patient blood...
January 10, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28073898/two-stage-isothermal-enzymatic-amplification-for-concurrent-multiplex-molecular-detection
#11
Jinzhao Song, Changchun Liu, Michael G Mauk, Shelley C Rankin, James B Lok, Robert M Greenberg, Haim H Bau
BACKGROUND: The wide array of pathogens responsible for infectious diseases makes it difficult to identify causative pathogens with single-plex tests. Although multiplex PCR detects multiple targets, it is restricted to centralized laboratories, which delays test results or makes multiplexing unavailable, depriving healthcare providers of critical, real-time information. METHODS: To address the need for point-of-care (POC) highly multiplexed tests, we propose the 2-stage, nested-like, rapid (<40 min) isothermal amplification assay, dubbed rapid amplification (RAMP)...
January 10, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28073897/identification-of-alk-ros1-and-ret-fusions-by-a-multiplexed-mrna-based-assay-in-formalin-fixed-paraffin-embedded-samples-from-advanced-non-small-cell-lung-cancer-patients
#12
Noemí Reguart, Cristina Teixidó, Ana Giménez-Capitán, Laia Paré, Patricia Galván, Santiago Viteri, Sonia Rodríguez, Vicente Peg, Erika Aldeguer, Nuria Viñolas, Jordi Remon, Niki Karachaliou, Esther Conde, Fernando Lopez-Rios, Ernest Nadal, Sabine Merkelbach-Bruse, Reinhard Büttner, Rafael Rosell, Miguel A Molina-Vila, Aleix Prat
BACKGROUND: Anaplastic lymphoma receptor tyrosine kinase (ALK), ROS protooncogene 1, receptor tyrosine kinase (ROS1), and ret protooncogene (RET) fusions are present in 5%-7% of patients with advanced non-small-cell lung cancer (NSCLC); their accurate identification is critical to guide targeted therapies. FISH and immunohistochemistry (IHC) are considered the gold standards to determine gene fusions, they have limitations. The nCounter platform is a potentially useful genomic tool for multiplexed detection of gene fusions, but has not been validated in the clinical setting...
January 10, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28073896/patient-specific-circulating-tumor-dna-detection-during-neoadjuvant-chemotherapy-in-triple-negative-breast-cancer
#13
Francesca Riva, Francois-Clement Bidard, Alexandre Houy, Adrien Saliou, Jordan Madic, Aurore Rampanou, Caroline Hego, Maud Milder, Paul Cottu, Marie-Paule Sablin, Anne Vincent-Salomon, Olivier Lantz, Marc-Henri Stern, Charlotte Proudhon, Jean-Yves Pierga
BACKGROUND: In nonmetastatic triple-negative breast cancer (TNBC) patients, we investigated whether circulating tumor DNA (ctDNA) detection can reflect the tumor response to neoadjuvant chemotherapy (NCT) and detect minimal residual disease after surgery. METHODS: Ten milliliters of plasma were collected at 4 time points: before NCT; after 1 cycle; before surgery; after surgery. Customized droplet digital PCR (ddPCR) assays were used to track tumor protein p53 (TP53) mutations previously characterized in tumor tissue by massively parallel sequencing...
January 10, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28073895/evaluation-of-genotypic-and-phenotypic-methods-to-detect-carbapenemase-production-in-gram-negative-bacilli
#14
Allison R McMullen, Melanie L Yarbrough, Meghan A Wallace, Angela Shupe, Carey-Ann D Burnham
BACKGROUND: Carbapenemase-producing gram-negative bacteria (CP-GNB) are an urgent and expanding public health threat. Rapid and accurate identification of these organisms facilitates infection prevention efforts in healthcare facilities. The objective of our study was to evaluate methods to detect and identify CP-GNB. METHODS: We examined 189 carbapenem-resistant GNB (CR-GNB), including Enterobacteriaceae, Pseudomonas aeruginosa, and Acinetobacter baumannii complex, using 3 different methods: 2 methods to screen isolates of GNB for carbapenemase production [the carbapenem inactivation method (CIM) and 2 chromogenic agars] and a molecular method (Cepheid GeneXpert Carba-R) to identify the mechanism of carbapenem resistance and the associated resistance genes (blaKPC, blaNDM, blaIMP, blaOXA-48-like, and blaVIM)...
January 10, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28073894/patient-consent-and-the-commercialization-of-lab-data
#15
Adam Tanner
No abstract text is available yet for this article.
January 10, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28031418/peripheral-inflammatory-biomarkers-for-myocardial-infarction-risk-a-prospective-community-based-study
#16
Zhijun Wu, Zhe Huang, Wei Jin, Eric B Rimm, Alice H Lichtenstein, Penny M Kris-Etherton, Shouling Wu, Xiang Gao
BACKGROUND: Most previous studies regarding chronic inflammation and risk of myocardial infarction (MI) have lacked repeated measures of high-sensitivity C-reactive protein (hs-CRP) and/or white blood cell (WBC) count over time. We examined whether cumulative average and longitudinal changes in these biomarkers were associated with subsequent MI risk. METHODS: In this prospective, community-based study, we included 82544 Chinese participants [66796 men and 15748 women; mean (SD) age 55...
December 28, 2016: Clinical Chemistry
https://www.readbyqxmd.com/read/28007957/molecular-portrait-of-metastasis-competent-circulating-tumor-cells-in-colon-cancer-reveals-the-crucial-role-of-genes-regulating-energy-metabolism-and-dna-repair
#17
Catherine Alix-Panabières, Laure Cayrefourcq, Thibault Mazard, Thierry Maudelonde, Eric Assenat, Said Assou
BACKGROUND: Unraveling the molecular mechanisms that regulate the biology of metastasis-competent circulating tumor cells (CTCs) is urgently needed to understand metastasis formation and tumor relapse. Our group previously established the first cell line (CTC-MCC-41) derived from metastasis-competent CTCs of a patient with colon cancer. METHODS: In this study, we analyzed the transcriptome of CTC-MCC-41 cells using Human Genome U133 Plus 2.0 microarrays with the aim of unraveling the molecular basis of their special features (stem cell properties and ability to initiate and support metastasis formation)...
December 22, 2016: Clinical Chemistry
https://www.readbyqxmd.com/read/27998906/biomedical-journals-and-preprint-services-friends-or-foes
#18
Thomas Annesley, Mitchell Scott, Hilda Bastian, Vivian Fonseca, John P A Ioannidis, Michael A Keller, Jessica Polka
No abstract text is available yet for this article.
December 20, 2016: Clinical Chemistry
https://www.readbyqxmd.com/read/27993938/direct-to-consumer-testing
#19
Michelle Li, Eleftherios P Diamandis, David Grenache, Michael J Joyner, Daniel T Holmes, Rodger Seccombe
No abstract text is available yet for this article.
December 19, 2016: Clinical Chemistry
https://www.readbyqxmd.com/read/27986784/anabasine-is-a-poor-marker-for-determining-smoking-status-of-transplant-patients
#20
LETTER
Matthew Feldhammer, James C Ritchie
No abstract text is available yet for this article.
December 16, 2016: Clinical Chemistry
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