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Artykuły w czasopismach na temat "Quantification tumorale"
Brulé, A., L. Matignon, N. Elie, J. Vigouroux, A. Roche, N. Lassau i P. Péronneau. "Acquisition 3D temps reel et quantification 3D de la perfusion tumorale par ultrasons". Journal de Radiologie 87, nr 10 (październik 2006): 1422. http://dx.doi.org/10.1016/s0221-0363(06)87456-1.
Pełny tekst źródłaBrulé, A., L. Matignon, N. Elie, J. Vigouroux, A. Roche, N. Lassau i P. Péronneau. "RECH2 Acquisition 3D temps reel et quantification 3D de la perfusion tumorale par ultrasons". Journal de Radiologie 87, nr 10 (październik 2006): 1552. http://dx.doi.org/10.1016/s0221-0363(06)87956-4.
Pełny tekst źródłaDucreux, D., i P. Lasjaunias. "Mesures et quantification de la perfusion et de la perméabilité tumorale: une nouvelle approche méthodologique". Journal of Neuroradiology 34, nr 1 (marzec 2007): 11–12. http://dx.doi.org/10.1016/j.neurad.2007.01.049.
Pełny tekst źródłaLassau, N., J. Pellier, J. Lacroix, V. Vilgrain, S. Taieb, R. Azziza, M. Cuinet, C. Labbe-Devilliers i A. Sarran. "ONCO-WS-12 Etude STIC : DCE-US avec quantification de la perfusion tumorale pour l’evaluation precoce des traitements anti-angiogeniques". Journal de Radiologie 90, nr 10 (październik 2009): 1557. http://dx.doi.org/10.1016/s0221-0363(09)76097-4.
Pełny tekst źródłaTARTA, Cláudio, Cláudio Rolim TEIXEIRA, Shinji TANAKA, Ken HARUMA, César CHIELE-NETO i Vinícius Duval da SILVA. "Angiogenesis in advanced colorectal adenocarcinoma with special reference to tumoral invasion". Arquivos de Gastroenterologia 39, nr 1 (marzec 2002): 32–38. http://dx.doi.org/10.1590/s0004-28032002000100007.
Pełny tekst źródłaSorbo, M. C., F. P. Antonucci, M. Manuelli, I. Lenci, D. Sforza, L. Carioti, M. C. Bellocchi i in. "Different Prevalence of HCV Resistance and HCV RNA Quantification Within Tumoral and Non Tumoral Liver Tissues in HCC/Transplanted Patients". Journal of Hepatology 64, nr 2 (2016): S416—S417. http://dx.doi.org/10.1016/s0168-8278(16)00668-1.
Pełny tekst źródłaSorbo, M. C., F. P. Antonucci, M. Manuelli, I. Lenci, D. Sforza, L. Carioti, M. C. Bellocchi i in. "Different prevalence of HCV resistance and HCV quantification within blood and liver samples (tumoral and non tumoral tissues) of HCC/transplanted patients". Digestive and Liver Disease 48 (luty 2016): e56. http://dx.doi.org/10.1016/j.dld.2015.12.130.
Pełny tekst źródłaRichards, Cathy E., Katherine M. Sheehan, Elaine W. Kay, Charlotta Hedner, David Borg, Joanna Fay, Anthony O’Grady, Arnold D. K. Hill, Karin Jirström i Ann M. Hopkins. "Development of a Novel Weighted Ranking Method for Immunohistochemical Quantification of a Heterogeneously Expressed Protein in Gastro-Esophageal Cancers". Cancers 13, nr 6 (13.03.2021): 1286. http://dx.doi.org/10.3390/cancers13061286.
Pełny tekst źródłaFeki-Tounsi, Molka, Pablo Olmedo, Fernando Gil, Mohamed-Nabil Mhiri, Ahmed Rebai i Amel Hamza-Chaffai. "Trace metal quantification in bladder biopsies from tumoral lesions of Tunisian cancer and controls subjects". Environmental Science and Pollution Research 21, nr 19 (7.06.2014): 11433–38. http://dx.doi.org/10.1007/s11356-014-3099-x.
Pełny tekst źródłaPatruno, Rosa, Giuseppe Passantino, Carmelo Laface, Antonella Tinelli, Alfredo Zito, Roberta Ruggieri, Francesco Luposella i in. "Microvascular Density, Endothelial Area, and Ki-67 Proliferative Index Correlate Each Other in Cat Post-Injection Fibrosarcoma". Cells 10, nr 1 (28.12.2020): 31. http://dx.doi.org/10.3390/cells10010031.
Pełny tekst źródłaRozprawy doktorskie na temat "Quantification tumorale"
Denis, Fabrice. "Quantification Doppler des modifications de la néovascularisation tumorale au cours des traitements anti-cancéreux". Tours, 2004. http://www.theses.fr/2004TOUR3303.
Pełny tekst źródłaTumour vascularization is implicated in tumour growth and progression. We aimed to study and quantify the functional vascularization of mammary tumours using Doppler-sonography in animal and in Human. A rat autochtonous mammary tumour system was used. Animals were treated by epirubicin, irradiation and TNP-470. Docosahexaenoique acid (DHA), a nutritional compound, was also used to assess its role in tumour growth and in vascularization. Vascular réduction following DHA administration was not associated with any changes in tumour growth. In irradiated rats, vascular changes occured 21 days before tumour shrinkage. Thèse changes in vascularization occured commensurely with tumour shrinkage subséquent to chemotherapy and were independant of tumour shrinkage following TNP-470 administration. In Human, early vascular changes were not predictive of tumour chemosensitivity following docetaxel. Tumour vascularization is involved in tumour response to anti-cancer agents
Lehmann, Pierre. "Quantification de la perfusion et de la perméabilité endothéliale dans la pathologie tumorale en IRM cérébrale". Amiens, 2008. http://www.theses.fr/2008AMIED012.
Pełny tekst źródłaThe perfusion imaging has shown its interest in the diagnosis and therapeutic monitoring of brain tumors. The MRI methods to measure the perfusion can be divided into two groups: methods using intravenous contrast agents and those not using them. The clinical applications on this imaging are still evaluating. After reminders on brain tumors, on angiogenesis and on contrast agent’s properties, we present the basic techniques of magnetic resonance imaging perfusion (MRI),and describe the different sequences acquisitions and analysis methods of perfusion images. In a second part three clinical studies using dynamic susceptibility contrast MR perfusion imaging, permeability and perfusion without injection of contrast are detailed and allow to characterize different types of brain tumors (eg, meningiomas, glioblastomas) These studies demonstrate the clinical use of MRI perfusion for a better diagnosis of encephalic tumors
Peretti, Agathe. "Quantification de l’hétérogénéité tumorale à partir de l’imagerie médicale. : Application à la classification de tumeurs rénales". Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0917.
Pełny tekst źródłaThis document deals with mathematical modelling of tumour growth. Biological indicators based on medical images are constructed in order to quantify tumoral heterogeneity. In the first part, a partial differential equations model made of two distinct cell subtypes is being studied. The model’s parameters are unique for each patient and each lesion. They are computed thanks to medical images (MRI or scan), which is a non-invasive method for the patient. Both the indicators and the model described are used on the cases of 5 patients treated with an anti-angiogenic medicine. The last part of the document aims at distinguishing different renal tumour subtypes that can be malignant or benign. Angiomyolipomas and renal cells carcinomas were particulary studied in the last part of the document
Orlhac, Fanny. "Au-delà de la mesure de SUV en imagerie TEP : propriétés et potentiel des paramètres de texture pour caractériser les tumeurs". Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112198/document.
Pełny tekst źródłaThe precise characterization of the biological heterogeneity of a tumor is a major issue in oncology. The calculation of biomarkers reflecting this heterogeneity directly from imaging data offers a number of advantages: it is non-invasive, can be repeated during the therapy, does not require supplementary examinations and the whole tumor and possible metastases can be investigated from the images. My research project was to develop and assess methods to characterize the metabolic activity distribution in tumors.Texture analysis based on PET images requires a protocol to compute index that is somehow more sophisticate than when simply measuring the conventional index used in clinical practice. To determine the role of the different steps that are involved in the computation of texture index, a methodological study was conducted. This study demonstrated that some texture parameters were redundant and that there existed a strong correlation between some of them and the metabolic volume. We have also shown that the formula and the rate of discretization impact the texture analysis and clarified the interpretation of these metrics. After the protocol of texture index computation has been established, the second part of this work was to assess the interest of these indices for the tumor characterization. We showed that some texture indices were different in tumor and in healthy tissue and could identify histological types such as the triple-negative breast tumors, the squamous cell carcinoma from adenocarcinoma in lung tumors, as well as the grade of gliomas.To understand the links between the tumor heterogeneity as measured from PET images and the biological heterogeneity of lesions, we compared the texture analysis based on different scales in a mouse model. This study revealed that the texture measured in vivo based on PET images reflects the texture measured ex vivo from autoradiographic images
Stute, Simon. "Modélisation avancée en simulations Monte Carlo de tomographie par émission de positons pour l'amélioration de la reconstruction et de la quantification". Paris 11, 2010. http://www.theses.fr/2010PA112264.
Pełny tekst źródłaPositron emission tomography (PET) is a medical imaging technique that plays a major role in cancer diagnosis and cancer patient monitoring. However, PET images suffer from a modest spatial resolution and high noise. As a result, there is no consensus on how the metabolically active tumour volume and the tumour uptake should be characterized. Ln the meantime, research groups keep producing new methods for tumour characterization based on PET images, which need to be assessed in realistic conditions. A Monte Carlo simulation based method has been developed to produce PET images of cancer patients that are indistinguishable from clinical images, and for which all parameters are known. Fourteen quantification methods were compared in realistic conditions using a group of patient data simulated using this method. Ln addition, the proposed method was extended to simulate serial PET scans in the context of patient monitoring, including modelling of tumour changes and variability over time of non-tumour physiological uptake. Ln a second part of the work, Monte Carlo simulations were used to study the detection probability inside the crystals of the tomograph. A model of the crystal response was derived and included in the system matrix involved in tomographic reconstruction. The resulting reconstruction method was compared with other sophisticated methods proposed in the literature. Using simulated data, we demonstrated that the proposed method improved the noise/resolution trade-off over equivalent approaches. We illustrated the robustness of the method using clinical data. The proposed method might lead to an improved accuracy in tumour characterization from PET images
Soussan, Michaël. "Developpement et applications cliniques de methodes de quantification en TEP pour le pronostic et le suivi therapeutique des cancers". Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112135.
Pełny tekst źródłaIn the era of personalized medicine, genomics and targeted therapies, the availability of quantitative tools assisting the interpretation of medical images is essential. In Positron Emission Tomography (PET), beyond measurements of uptake intensity, it is possible to derive quantitative index characterizing the metabolic volume or the tumoral heterogeneity. The objective of this work was to investigate the value of new quantitative indices to enhance PET imaging, allowing for a more comprehensive analysis of the whole tumor. The first part of the work deals with methodological issues associated with the measurement of tumor heterogeneity using textural index. In particular, we identified the most robust and informative textural index for clinical applications. Two sets of patients have then been used to explore the contribution of metabolic volume and texture analysis in PET. In lung cancer patients, our results suggest that the measurement of tumor heterogeneity gives some information regarding the histological features of the tumor. A second set of results shows that metabolic volume is more relevant than conventional indices for evaluating the impact of neoadjuvant chemotherapy in locally advanced stages. A correlation between quantitative changes during treatment and post-treatment histology results was used to demonstrate the relevance of these indices. In breast cancer patients, our results suggest that tumors with aggressive immunohistological patterns, particularly triple-negative phenotype, have a more heterogeneous texture than other types. In summary, our results suggest that a more comprehensive quantitative characterization of the metabolic activity distribution in tumor using PET imaging improves the pre-therapeutic and prognostic evaluation of cancer
Hullo, Marie. "Place des nanoparticules pour lutter contre la radio-résistance du cancer du sein : impact de l’hétérogénéité tumorale Gold Nanoparticle Uptake in Tumor Cells: Quantification and Size Distribution by sp-ICPMS . Radiation Enhancer Effect of Platinum Nanoparticles: Experimental in Vitrolimits Andrelevant Physical Chemical Simulation". Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPASL004.
Pełny tekst źródłaThe use of high-Z nanoparticles to enhance radiotherapy effects has gained momentum over the last decade. Historically, as nanoparticles increase tumor density, they were thought to improve radiation dose by locally increasing the probability of interactions with ionizing radiations. Local dose enhancement is then associated with increased oxidative stress and DNA damage. Therefore, radiosensitization with nanoparticles could impair radioresistance as well as improve therapeutic index. Radiotherapy is a cornerstone of breast cancer treatment. However, mammary tumors are heterogeneous and comprise distinct populations of cancer cells that respond differently to treatments. Cancer stem cells (CSC) and epithelial to mesenchymal transition (EMT) are major factors contributing to cancer cells plasticity, tumor heterogeneity, and escape from programmed cell death (apoptosis). In breast cancer, both CSC and cells undergoing EMT are characterized by the expression of two surface markers CD24 and CD44 (CD24-/low, CD44 high). This work aims to evaluate the efficiency of high-Z nanoparticles of different nature (gold, platinum), different size (from 5 to 35 nm) and different surface charge (positive and negative) as potent radiosensitizer on several breast cancer models of different epithelial or mesenchymal state. As no significant change could initially be observed in vitro following the combination of nanoparticles with radiation compared to radiation alone, I gain insight on the influence of physical, chemical and biological parameters required for characterizing radio-enhancement. Among them, I focused on improving the diffusion of nanoparticles and their internalization in tumor cells. I showed that nanoparticles uptake by breast cancer cells was depending on their mesenchymal state: nanoparticle internalization by cancer cells is dramatically increased in mesenchymal-like cancer cells compared to epithelial-like cells across a panel of several breast cancer cell lines. Importantly this discrepancy was not affected by the charge, size or surface chemistry of the nanoparticles themselves. This strongly suggests a cell-dependent mechanism, in opposition to the current paradigm that nanoparticles uptake is mainly governed by their inherent physical/chemical properties. This study emphasized the importance of membrane and extracellular structures in nanoparticle recognition and preferential interaction with cells. Our results are of peculiar interests as the identification of genes or mechanisms facilitating nanoparticles accumulation into radioresistant cancer cells could further conception of promising therapeutic nanoparticles
Gauthier, Marianne. "Etude de l’influence de l’entrée artérielle tumorale par modélisation numérique et in vitro en imagerie de contraste ultrasonore. : application clinique pour l’évaluation des thérapies ciblées en cancérologie". Thesis, Paris 11, 2011. http://www.theses.fr/2011PA11T088.
Pełny tekst źródłaDynamic contrast-enhanced ultrasonography (DCE-US) is currently used as a functional imaging technique for evaluating anti-angiogenic therapies. A mathematical model has been developed by the UPRES EA 4040, Paris-Sud university and the Gustave Roussy Institute to evaluate semi-quantitative microvascularization parameters directly from time-intensity curves. But DCE-US evaluation of such parameters does not yet take into account physiological variations of the patient or even the way the contrast agent is injected as opposed to other functional modalities (dynamic magnetic resonance imaging or perfusion scintigraphy). The aim of my PhD was to develop a deconvolution process dedicated to the DCE-US imaging, which is currently used as a routine method in other imaging modalities. Such a process would allow access to quantitatively-defined microvascularization parameters since it would provide absolute evaluation of the tumor blood flow, the tumor blood volume and the mean transit time. This PhD has been led according to three main goals. First, we developed a deconvolution method involving the creation of a quantification tool and validation through studies of the microvascularization parameter variability. Evaluation and comparison of intra-operator variabilities demonstrated a decrease in the coefficients of variation from 30% to 13% when microvascularization parameters were extracted using the deconvolution process. Secondly, we evaluated sources of variation that influence microvascularization parameters concerning both the experimental conditions and the physiological conditions of the tumor. Finally, we performed a retrospective study involving 12 patients for whom we evaluated the benefit of the deconvolution process: we compared the evolution of the quantitative and semi-quantitative microvascularization parameters based on tumor responses evaluated by the RECIST criteria obtained through a scan performed after 2 months. Deconvolution is a promising process that may allow an earlier, more robust evaluation of anti-angiogenic treatments than the DCE-US method in current clinical use
Machon, Christelle. "Quantification des pools de nucléotides à l'aide de la chromatographie liquide couplée à la spectrométrie de masse en tandem : applications à l'étude de la progression tumorale". Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10217/document.
Pełny tekst źródłaNucleotides, term including nucleoside mono-, di- and triphosphates, are endogenous compounds playing various roles in biology. They are components of nucleic acids, provide energy to metabolic reactions and act as carriers or second messenger. The study of endogenous nucleotides has become of great interest in physiological and pathological conditions. We developed a method for the quantification of endogenous nucleotides, using an on-line extraction on a WAX column coupled with LC-MS/MS. Analytical separation is performed on a Hypercarb column, without ion pairing agent in the mobile phase. The use of a triple quadrupole mass spectrometer following positive mode ionization allows the unambiguous identification of nucleotides presenting the same mass. Extraction and separation of nucleotides are achieved within 20 min and the method including re-equilibration of the two columns within 37 min. The method was validated for the quantification of nucleoside mono- and triphosphates, and could be applied to series of more than twenty biological samples. Secondly, in a study based on design of experiments, pre-analytical parameters influencing results of intracellular nucleotides were compared in four cell lines. We demonstrated that optimal pre-analytical parameters depend on cell lines. This clearly highlights the importance of pre- analytical conditions for the quantification of intracellular nucleotides to be as representative as possible of the real levels in cells. Then, thanks to experience acquired during the development and the validation of the analytical method, scientific collaborations have been established with several cancer research teams. For example, implication of nucleotide metabolism in replicative stress induced by oxidative stress or in the metabolic reprogramming in cancer cells was studied. Results obtained by our analytical approach were complementary to those obtained by other techniques. To conclude, our work consisted on the study of the entire workflow for the analysis of endogenous nucleotides in various biological samples
Goldwirt, Lauriane. "Rôle des médicaments antiangiogéniques et de l’expression des transporteurs d’efflux de la barrière hémato-encéphalique dans la modulation du passage intracérébral et intratumoral des médicaments utilisés dans le traitement du glioblastome". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA114820.
Pełny tekst źródłaGlioblastomas are the most common brain tumors occurring in France with an incidence of 4 new cases per year per 100 000 population (2400/year). The gold standard pharmacological treatment of newly diagnosed glioblastoma relies on temozolomide administration (75 mg/m2/d) concomitant to radiotherapy, followed by six cycles consolidation. However, despite this treatment, the median survival is only 15 months and relapse occurs within 3 to 9 months. New therapeutic approaches are needed. Among them, other chemotherapies (irinotecan) and inhibition of angiogenesis were explored. Angiogenesis is a critical process in GBM progression. Inhibition of angiogenesis, inducing a reduction of the blood vessels, reduces supply of nutrients and oxygen to the tumor. The effectiveness of GBM treatment is subjected to intra-brain diffusion through the blood-brain barrier. The objective of this study was firstly to study the impact of efflux transporter ABCB1 brain expression on temozolomide (TMZ) and irinotecan (CPT-11) brain distribution, and secondly, to assess the role of bevacizumab (BVZ)(angiogenesis inhibitor) in the modulation of TMZ and CPT-11 brain and tumor distribution. Using a comparative pharmacokinetic study in CF1 mdr1a (+/+) and CF1 mdr1a (-/-) mice, we demonstrated an active efflux of TMZ, CPT-11 and its active metabolite SN-38 from the brain to the plasma involving ABCB1. We also demonstrated in vivo that TMZ accumulates in brain tumor and BVZ pretreatment increased TMZ tumor distribution. However no effect of BVZ on CPT-11 brain or tumor distribution was evidenced. Therefore BVZ would appear to be an interesting way to increase TMZ tumor distribution. The same objective was pursued through a different approach using ultrasound unfocused to open the BBB (Carthera collaboration)
Streszczenia konferencji na temat "Quantification tumorale"
Schmidt, RA, SM Dintzis i KH Allison. "Abstract P6-05-04: Quantification of Intra-Tumoral Heterogeneity for HER2 Gene Amplification by FISH with Proposed New (“High-ICR”) Reporting System". W Abstracts: Thirty-Third Annual CTRC‐AACR San Antonio Breast Cancer Symposium‐‐ Dec 8‐12, 2010; San Antonio, TX. American Association for Cancer Research, 2010. http://dx.doi.org/10.1158/0008-5472.sabcs10-p6-05-04.
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