Abstract：
BACKGROUND:In standard pre-analytical conditions, an isolation step is required for circulating tumor DNA (ctDNA) analysis. The need for this step remains unclear with the development of ultrasensitive detection technologies such as digital PCR (dPCR). The aim of our study was to evaluate the ctDNA detection by dPCR platform either directly from plasma (plasma group, PG) or after an isolation step (isolation group, IG). METHODS:We included 17 patients corresponding to a selection of 43 blood samples in metastatic colorectal cancer patients. For each sample, ctDNA was analyzed with or without isolation step (IG and PG, respectively) using KRAS, NRAS and BRAF mutations identified from the tumor tissue. ctDNA detection was performed after a preamplication step using dPCR platform (QuantStudio™ 3D Digital PCR System). ctDNA detection rate and mutant allelic frequencies (MAF) were compared between IG and PG. RESULTS:Our results showed a detection rate at 93% in IG vs. 88% in PG. The concordance rate between the two groups was 91% (39/43) for ctDNA detection with the four discordant cases occurring in patients with low MAF (<0.5%). The mean value of MAF were 16.9±18.9 and 18.5±18.9 for IG and PG, respectively (p=0.24). The correlation coefficient r2 for MAF was 0.82 between the two methods (p<0.0001). CONCLUSION:In conclusion, our results show that direct detection of ctDNA from unpurified plasma is a feasible approach, particularly from sample with high MAF (>0.5%).
journal_name
Clin Biochemjournal_title
Clinical biochemistryauthors
Sefrioui D,Beaussire L,Perdrix A,Clatot F,Michel P,Frebourg T,Di Fiore F,Sarafan-Vasseur Ndoi
10.1016/j.clinbiochem.2017.06.005subject
Has Abstractpub_date
2017-11-01 00:00:00pages
963-966issue
16-17eissn
0009-9120issn
1873-2933pii
S0009-9120(17)30204-7journal_volume
50pub_type
杂志文章abstract：OBJECTIVES:Most clinical laboratories replaced their manual precipitation techniques for the determination of urinary protein with automated dye binding assays or benzethonium chloride-turbidimetric assays. Few studies have validated these assays for the measurement of urinary proteins in the normal range. DESIGN AND ...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2004.12.010
更新日期：2005-05-01 00:00:00
abstract：OBJECTIVE:The purpose of our study was to investigate the serum levels of soluble a-proliferation-inducing ligand (sAPRIL) in patients with colorectal cancer (CRC), benign intestinal disease and healthy volunteers and explore the potential possibility of sAPRIL severing as a CRC biomarker. METHODS:Our investigation wa...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2013.06.008
更新日期：2013-10-01 00:00:00
abstract：OBJECTIVE:We developed assays for measurement of urinary betaLH and betaFSH under collection and storage conditions typical of non-clinical research settings. DESIGN AND METHODS:IEMAs for free betaLH and total betaFSH were validated by standard methods. Stability of urinary betaLH and betaFSH was tested across freeze-...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2006.08.009
更新日期：2006-11-01 00:00:00
abstract：OBJECTIVE:Erythrocyte pyrimidine 5'-nucleotidase (Pyr-5'-N) is highly sensitive to heavy metal inactivation in vitro and in vivo, and a number of studies have verified its usefulness as a biomarker of acute and chronic lead exposures. Retrospective and prospective studies attempted to determine whether the known linear...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(99)00003-x
更新日期：1999-04-01 00:00:00
abstract：OBJECTIVES:Both kidney expression and soluble serum Klotho are influenced by chronic kidney disease (CKD) and diabetes. Serum Klotho is a yet poorly explored biomarker. We describe, for the first time to our knowledge, serum Klotho in diabetic patients with CKD and its relationship to vascular endothelial growth factor...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2012.07.098
更新日期：2012-11-01 00:00:00
abstract：:Lipoprotein lipase (LPL) of adipose cells is present only in membrane compartments, mainly in the Golgi apparatus. LPL is a typical secretory protein which appears to be active as a homodimer. The process of LPL synthesis and maturation requires multiple steps. LPL is synthesized in the endoplasmic reticulum as an ina...
journal_title：Clinical biochemistry
pub_type： 杂志文章,评审
doi：10.1016/0009-9120(90)90034-r
更新日期：1990-10-01 00:00:00
abstract：:Plasma levels of dehydroepiandrosterone sulfate, dehydroepiandrosterone and delta 5-androstenediol were measured in several women throughout pregnancy. The levels of both dehydroepiandrosterone and its sulfate decreased while those of delta 5-androstenediol did not. The levels of binding of the latter steroid to plasm...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(80)90795-x
更新日期：1980-06-01 00:00:00
abstract：OBJECTIVES:In joint degenerative diseases, the collagens are degraded by matrix metalloproteinases and protein fragments are released to serum as potential biomarkers. METHODS:A collagen type II specific neoepitope, CIIM, was identified (…RDGAAG(1053)) by mass spectrometry. Two ELISAs against the neoepitope were devel...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2011.01.001
更新日期：2011-04-01 00:00:00
abstract：OBJECTIVES:To determine the relationship between BiliChek TcB (Respironics, Marietta GA) and Doumas reference serum or plasma total bilirubin (TSB). DESIGN AND METHODS:Pooled samples with values assigned by the Doumas reference method were used to establish the relationship between a local laboratory and reference Dou...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2010.04.065
更新日期：2010-08-01 00:00:00
abstract：OBJECTIVES:To investigate the activities of the main antioxidative enzymes and oxidative stress in women with depressive disorder (DD). METHODS:In 35 drug-naive women with DD and 35 age matched healthy women enzymes superoxide dismutase (CuZnSOD), catalase (CAT), glutathione peroxidase (GPX1), glutathione reductase (G...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2009.06.006
更新日期：2009-09-01 00:00:00
abstract：OBJECTIVES:The practical application of elevated carbohydrate antigen 125 (CA125) to predict clinical outcome in chronic heart failure (CHF) is under debate. The mechanism for this CA125 elevation remains unknown. We hypothesize that mechanical stress on mesothelial cells initiates CA125 synthesis. DESIGN AND METHODS:...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2013.09.008
更新日期：2013-11-01 00:00:00
abstract：:Matrix metalloproteinases (MMPs) may play a pathophysiological role in the development of diabetic nephropathy (DN). We hypothesized that urinary MMP activity in patients with type 2 diabetes mellitus (T2DM) is related to a decline in renal function. We determined MMP-2, -8 and -9 activity in 24-h urine collections in...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2010.02.006
更新日期：2010-05-01 00:00:00
abstract：OBJECTIVES:We investigated the relationships of biomarkers of various pathophysiologic pathways including high-sensitivity C-reactive protein (hs-CRP), lipocalin-2 (LCN2), myeloperoxidase (MPO) and matrix metalloproteinases 9 (MMP9) with mortality in stroke patients. DESIGN AND METHODS:hs-CRP, LCN2 and MPO concentrati...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2012.06.014
更新日期：2012-11-01 00:00:00
abstract：OBJECTIVES:Association between vitamin D deficiency and excess of vitamin A as a potential risk factor of osteoporosis and fracture has been evaluated. DESIGN AND METHODS:232 healthy postmenopausal women were studied. Serum parameters were analyzed by standard methods and fat-soluble vitamins by an own HPLC method. QU...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2010.06.001
更新日期：2010-09-01 00:00:00
abstract：:Drug therapy may produce toxicity. Patient individuality or drug interactions account for many cases of poisoning, but other factors such as genetic predisposition, drug contamination or human error are also known causes. Examples of various types of drug poisoning are given, illustrating the role of the clinical chem...
journal_title：Clinical biochemistry
pub_type： 杂志文章,评审
doi：10.1016/0009-9120(90)90507-q
更新日期：1990-02-01 00:00:00
abstract：BACKGROUND:While investigating estrogen response element (ERE) binding properties of human estrogen receptor-α (hERα) in breast cancer cytosols, other ERE-binding proteins (ERE-BP) were observed. DESIGN AND METHODS:Recognition properties of ERE-BP were evaluated by electrophoretic mobility shift assays (EMSA) with ERE...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2013.07.005
更新日期：2013-11-01 00:00:00
abstract：UNLABELLED:Experimental studies confirmed that reactive oxygen species increase endothelin-1 (ET-1) synthesis, and modulate ET-1 signaling pathway resulting in vasoconstriction and vascular remodeling. The aim of this study was to evaluate the relationship between plasma ET-1 concentration and antioxidant status in pat...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2008.11.002
更新日期：2009-03-01 00:00:00
abstract：:Increasing interest in the use of tumor markers in the clinical management of cancer patients has encouraged development of guidelines by local, national and international groups. Such guidelines generally include recommendations about which markers are likely to be most helpful in given circumstances. Particular requ...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(01)00199-0
更新日期：2001-07-01 00:00:00
abstract：OBJECTIVES:To develop immunofluorometric procedures for measuring BRCA1 protein in various biological fluids and tissue extracts. DESIGN AND METHODS:Five commercially available monoclonal and polyclonal antibodies against BRCA1 were evaluated for developing competitive and non-competitive immunofluorometric procedures...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(97)00042-8
更新日期：1997-07-01 00:00:00
abstract：:Fourteen antirheumatoid drugs were tested for their effects on the in vitro hyaluronidase activity of normal human serum. Four drugs produced significant changes in enzyme activity. Different results were obtained with ovine testicular hyaluronidase when diluted with either saline or inactivated human serum. No increa...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(76)80053-7
更新日期：1976-08-01 00:00:00
abstract：OBJECTIVES:Mucopolysaccharidoses (MPSs) are a group of rare, inherited metabolic disorders which result from the lack of one of the lysosomal enzymes responsible for the degradation of glycosaminoglycans. Early recognition of MPS is important as it enables prompt implementation of enzyme replacement therapy (ERT). Dipe...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2015.11.011
更新日期：2016-04-01 00:00:00
abstract：OBJECTIVES:In a study by Couto et al. (Use of an algorithm applied to urine drug screening to assess adherence to an oxycontin regimen. J Opioid Manag 2009;5:359-64), adjusted urine measurements of oxycodone plus metabolites noroxycodone and oxymorphone were determined among volunteer subjects in three groups according...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2012.09.016
更新日期：2013-01-01 00:00:00
abstract：OBJECTIVES:The aims of this study were to develop a new technique for determination of iron content of serum ferritin (ICF, micromol Fe/mg protein) and to investigate relations between ICF and clinical status in patients with hyperferritinemia. METHODS:ICF values were determined by a combination of immunoprecipitation...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(02)00380-6
更新日期：2002-10-01 00:00:00
abstract：OBJECTIVE:To determine the serum level of fast skeletal troponin I (fsTnl) resulting from skeletal muscle damage, we have developed a sensitive two-site enzyme immunoassay to measure skeletal troponin I. DESIGN AND METHODS:Twelve monoclonal antibodies were raised against human fsTnl. Of these antibodies, 8 were fsTnl-...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/0009-9120(96)00016-1
更新日期：1996-08-01 00:00:00
abstract：OBJECTIVE:To evaluate if peak characteristics, the retention time, and percentage of total hemoglobin of an unknown peak on the Bio-Rad VARIANT II Hb A1c method may be used to establish a tentative identification of hemoglobin variants. METHOD:The peak characteristics, retention time, and percentage of total hemoglobi...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2004.11.004
更新日期：2005-03-01 00:00:00
abstract：:1. A relatively inexpensive semi-automated enzymatic procedure is described for the determination of total glycerol with an Auto Analyzer. Free glycerol is determined without saponification in a deproteinized supernatant. 2. The dilution of triglyceride samples during preparation is such that the samples during prepar...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(77)90232-6
更新日期：1977-02-01 00:00:00
abstract：:Immunoturbidimetric assays for specific proteins are available on "open system" clinical chemistry analyzers. The analytical performance of nine immunoturbidimetric specific protein assays (C3, C4, CRP, Haptoglobin, IgA, IgG, IgM, RF, and Transferrin) was compared to immunonephelometry. Testing was performed on the Ab...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2009.06.016
更新日期：2009-10-01 00:00:00
abstract：INTRODUCTION:Gaucher disease (GD) is caused by a deficiency of β-glucosidase (GCase), leading to accumulation of glucosylceramide (GlcC) and glucosylsphingosine (Lyso-Gb1). Lyso-Gb1 is a reliable biomarker for GD. OBJECTIVES:This study aims to develop a simple, effective and accurate method for the screening and diagn...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2020.10.011
更新日期：2021-01-01 00:00:00
abstract：OBJECTIVES:Define performance characteristics of the Stratus CS cardiac troponin I (cTnI) assay in routine practice. METHODS:Imprecision at low cTnI values was assessed according to NCCLS EP5-A. Linearity was assessed by regression analysis; the reference interval was determined in 345 healthy individuals. Minimum det...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2004.03.009
更新日期：2004-08-01 00:00:00
abstract：:Increased hemoglobin A1 (HbA1) occurs in diabetes mellitus as a direct consequence of hyperglycemia, which causes postsynthetic modification of hemoglobin proportional to blood glucose concentration. Glycosylation of hemoglobin is demonstrable also in vitro, not only by glucose, but with other reducing sugars such as ...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(82)90556-2
更新日期：1982-06-01 00:00:00
