Phase: unknown
nct MAJ Il y a 4 ans
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Grace Younes, M.D MAJ Il y a 4 ans
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Hao Long, Prof MAJ Il y a 4 ans

Efficacy and Safety Study of Bevacizumab Plus Chemotherapy in EGFR-TKI Resistant Non-Squamous Non-Small Cell Lung Cancer Epidermal growth factor receptor (EGFR) tyrosine kinase is one of most popular target molecules in the field of anticancer drug research. EGFR is highly expressed in many types of tumor cells, which could activate EGFR cytosolic kinase activity by binding to its ligand EGF, and regulates gene expression, cell proliferation, differentiation, apoptosis through different signal transduction pathways. Epidermal growth factor receptor tyrosine kinase inhibitor (EGFR-TKI), competitive to specifically combined with the EGFR kinase domain, thus inhibits its kinase activity, thereby blocking cancer cell proliferation or metastasis. At present, EGFR-TKI has been widely used in clinical activity, especially in patients with EGFR mutations, which had been proved to achieved a certain effect. But with the passage of time, a drug resistance is inevitable. At present, studies have found that the cessation of treatment immediately after EGFR-TKI resistance may lead to rapid progress of cancer. Chemotherapy, as one of the most widely accepted modality in cancer treatment, might also be one of the salvage therapies of target treatment. Therefore, in patients with better physical status (PS) scores, chemotherapy is commonly applicable. In January 2010, a study published in the journal of Clinical Lung Cancer reported the application of chemotherapy as salvage treatment for advanced non-small cell lung cancer (NSCLC) patients with resistant to first-line EGFR-TKI treatment. Of the 114 patients enrolled, 67 received sequential chemotherapy, the other 47 patients received best supportive care. The results showed that, sequential chemotherapy can improve the survival time of the patients, compared with chemotherapy and supportive care groups (11.2 months vs. 3.8 months, P< 0.01). Furthermore, in those who received sequential chemotherapy, a regimen containing paclitaxel got higher efficiency and disease control rate than those without (48.7% vs. 21.4%, 79.5% vs. 53.5% , P< 0.05), as well as longer progression-free survival (PFS, 5.1 months vs. 1.8 months, P< 0.01) and overall survival (OS, 12.7 months vs. 7 months, P< 0.01). Another study in Taiwan which enrolled 195 patients treated with at least 1 cycles sequential chemotherapy after first-line gefitinib shown similar results. Generally, gefitinib as a first-line treatment had PFS for 5 months, and the second-line treatment efficiency was 14.4%. Regimens of platinum or paclitaxel had a better treatment efficiency (50.6%). A poor therapeutic effect was reported for gefitinib as second-line therapy (5.6%). In total, the median OS of second-line treatment was 12.2 months. In addition, platinum containing regimens survival better (21.7 months vs. 8.9 months, P< 0.01); patients with mutant EGFR benefit more in a platinum-based chemotherapy (24.5 months vs. 8.5 months, P< 0.05). Bevacizumab (trade name Avastin ®) is a kind of recombinant humanized monoclonal immunoglobulin gamma-1 (IgG1) antibody, which can selectively inhibit the combination process of vascular endothelial growth factor (VEGF) and its receptor, Flt-1 and kinase domain receptor (KDR) in endothelial cells. A reduction of tumor angiogenesis, blood supply, oxygen and other nutrients supply could be obtained after the VEGF loss of its biological activity, thus inhibit tumor growth. The drug was approved for the first-line treatment of advanced colorectal cancer in 2004 by America food and Drug Administration (FDA),thus became the first for clinical use of drugs that targeting VEGF. As the first globally approved anti-angiogenic monoclonal antibody drugs, bevacizumab has approved for advanced colorectal cancer, lung cancer, breast cancer, renal cell carcinoma and malignant glioma patients, which was used in more than 500000 cases. In the field of advanced NSCLC treatment, clinical results confirm bevacizumab combined with chemotherapy can prolong OS and PFS of patients with NSCLC, and well tolerated. The thirty-fifth annual meeting of the European Society of Medical Oncology (ESMO) conference released a meta analysis results of bevacizumab combined with platinum chemotherapy for first-line treatment of advanced non squamous NSCLC. It is confirmed that, treatment with bevacizumab based chemotherapy for advanced non squamous NSCLC patients could achieve significant survival benefit, prolong remission time, and expected safety. Therefore, the investigators design this phase II to testify the efficacy and safety of bevacizumab + chemotherapy for EGFR-TKI resistant non squamous NSCLC.

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Gürkan Sengölge, MD MAJ Il y a 4 ans

Identification of Patients With High Probability of Poorly Responding to Therapy With Mycophenolic Acid Prodrugs This study is designed to define groups of patients (among patients with a heart or kidney graft or a glomerular disease and nephrotic range proteinuria) who would either not profit from a therapy with mycophenolate-mofetil (MMF) or need a higher than conventional dose to respond. Mainly there are 2 possible explanations for inter-patient differences in responsiveness to MMF therapy: 1. Based on a mutation (in this study single nucleotide polymorphisms-SNPs-) in the inosine monophosphate dehydrogenase 2 (IMPDH 2) transcript as the target enzyme of mycophenolic acid (MPA) pathway, MMF cannot exert its effect. 2. Based on a high enzyme activity of IMPDH 2 a higher MMF dose than in the conventional regimens is needed. To study the significance of these possible explanations there are 4 objectives in this study: Objective 1: Since there are no data on SNPs with functional relevance in IMPDH 2 transcript, we will first sequence all 14 exons of this gene in their entirety in 100 gender and age matched healthy individuals. Objective 2: The functional relevance of a detected SNP will be tested in vitro in a lymphocyte proliferation assay using various MPA concentrations. Objective 3: These functionally relevant SNPs will be searched in patients with kidney graft in a retrospective as well as prospective manner. Objective 4: Parallel to the genotyping experiments, IMPDH 2 activity and MPA plasma levels will be measured in all patients recruited in the study prospectively. An association between these SNPs or various IMPDH 2 activity / MPA plasma levels with MMF responsiveness will be examined.

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Angelo LIVOLSI MAJ Il y a 4 ans

Validation of a Non Invasive Blood Marker of SIDS and Vagal Disorders Context The investigators recently demonstrated a highly significant increase in muscarinic receptor density in the myocardium of infants deceased from sudden infant death syndrome (SIDS) compared to those of infants deceased from identified causes 1. Muscarinic receptor overexpression was found in all SIDS samples studied to date. It was associated with an average increase in acetylcholinesterase activity, appearing as a compensatory mechanism to oppose the cardiac muscarinic receptor overexpression. Similar vago-cardiac abnormalities were detected in a rabbit model of vagal hyperreactivity that the investigators first described some years ago2. In these hyperreactive animals, expression of muscarinic receptors was also enhanced in blood white cells. Noticeably, the pattern of changes in these cells paralleled the pattern of changes in the heart. Thus, muscarinic abnormalities in cardiac tissues could be inferred with high confidence from those measured in lymphocytes.This was the first report of a vago-cardiac abnormality in sudden infant death syndrome. The investigators findings also provided original and important perspectives for the identification and therapeutic management of infants at risk of sudden death. As such, the publication of the investigators work raised a major interest from the population and from the scientific and medical communities, in particular cardio-pediatricians. ObjectivesThe objective of the present clinical project is to validate, in human lymphocytes, muscarinic receptor expression level (assessed by quantitative RT-PCR) as a circulating biomarker of autonomic nervous system dysfunction and more specifically, of vagal hyperactivity and of risk of sudden death. The project will include 2 major items, conducted in parallel:1. evaluation of the muscarinic receptor expression in lymphocytes from adults with vagal syncopes (n=60 patients from an existing file versus 60 controls) (Cardiology unit + Clinical Investigation Centre (CIC) + Laboratory of Neurobiology and Cardiovascular Pharmacology); 2. evaluation of the muscarinic receptor expression in lymphocytes from children with vagal syncopes (n=60 versus 60 controls) (Pediatry unit + Clinical Investigation Centre + Laboratory of Neurobiology and Cardiovascular Pharmacology).PerspectivesThis project represents the first step of validation of a circulating marker of vagal hyperactivity and of risk of SIDS in human. Once this step is completed, the investigators will start with the prospective study " muscarinic receptor expression in lymphocytes and SIDS " (cord blood collected at birth and follow up of the new-borns) (Maternity ward + CIC + Laboratory of Neurobiology and Cardiovascular Pharmacology). Then therapeutic preventive management becomes a realistic objective. A therapeutic clinical study will then be started with atropinic drugs, in order to test their potential protective action against sudden death. The final objective of the investigators research is the prevention of SIDS through i) identification - as soon as birth - of new-borns at high risk and ii) appropriate prophylactic therapy. The investigators work also opens exciting perspectives in the field of the still poorly understood vagal disorders in children and adults such as vagal pauses.1 Livolsi et coll, Plos One 5, e9464, 2010 ; 2 Livolsi et coll, Circulation 106, 2301-2304, 2002

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