Publications by authors named "Pierre Bet"

Article Synopsis
  • Up to 30% of patients experience severe toxicity from fluoropyrimidine chemotherapy due to dihydropyrimidine dehydrogenase (DPD) deficiency, prompting the need for DPYD genotyping, though only 17% of those with severe toxicity show a DPYD variant.
  • A study involving 36 gastrointestinal cancer patients examined the relationship between 5-FU exposure and levels of biomarkers such as uracil and thymine, finding a noteworthy correlation between thymine levels and 5-FU exposure.
  • The results suggest that using thymine concentrations in conjunction with DPYD genotyping could help predict and manage toxicity from 5-FU, indicating the need for larger trials to further validate this method.
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Background: Low-dose amitriptyline and mirtazapine are widely prescribed off-label for insomnia disorder. However, evidence from placebo-controlled studies is lacking.

Aim: To assess the effectiveness of low-dose mirtazapine and amitriptyline in patients with insomnia disorder.

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Non-specific effects of methylphenidate treatment, including expectancy and regression to the mean effects, contribute to the overall effect of methylphenidate on attention-deficit/hyperactivity disorder (ADHD) symptoms. Knowledge on the extent to which non-specific effects contribute to the overall effect and whether regression to the mean explains part of the non-specific effects, is currently lacking. A double-blind, randomized, placebo-controlled, cross-over trial was used to compare parent and teacher ratings of child ADHD symptoms at baseline and during treatment with placebo and 5, 10, 15 and 20 mg of methylphenidate, twice daily.

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Background: Tailoring antidepressant drugs (AD) to patients' genetic drug-metabolism profile is promising. However, literature regarding associations of ADs' treatment effect and/or side effects with drug metabolizing genes CYP2D6 and CYP2C19 has yielded inconsistent results. Therefore, our aim was to longitudinally investigate associations between CYP2D6 (poor, intermediate, and normal) and CYP2C19 (poor, intermediate, normal, and ultrarapid) metabolizer-status, and switching/discontinuing of ADs.

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Despite the availability of various treatment approaches for patients with posttraumatic stress disorder (PTSD), some patients do not respond to these therapies, and novel treatment approaches are needed. This study investigated the efficacy of mifepristone, a glucocorticoid receptor antagonist, in treatment-resistant PTSD patients. Three patients with PTSD who were resistant to standard psychological and pharmacological treatments were prescribed mifepristone (600-1,200 mg/day) for 1 week.

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Cognitive impairments, common sequelae of acquired brain injury (ABI), significantly affect rehabilitation and quality of life. Currently, there is no solid evidence-base for pharmacotherapy to improve cognitive functioning after ABI, nevertheless off-label use is widely applied in clinical practice. This meta-analysis and meta-regression aims to quantitatively aggregate the available evidence for the effects of pharmacological agents used in the treatment of cognitive impairments following ABI.

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Background And Objectives: Concerns exist regarding the rising use of methylphenidate. A double-blind, placebo-controlled methylphenidate titration (PCT) for children with attention-deficit/hyperactivity disorder (ADHD) has shown potential to improve titration (i.e.

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Novel gonadotrophin releasing hormone (GnRH) antagonist treatments have recently been developed in combination with hormonal add-back therapy, as an oral treatment option for women suffering from uterine fibroids. Registration trials assessing the GnRH antagonist combination preparations with relugolix, elagolix and linzagolix have assessed treatment efficacy for fibroid-related heavy menstrual blood loss in comparison to placebo. Marketing authorization has been granted by several agencies including those in Europe, the United Kingdom and the United States.

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Article Synopsis
  • - The study evaluated the effects of intravenous imatinib on patients with acute respiratory distress syndrome (ARDS) caused by COVID-19, focusing on its ability to reduce pulmonary edema.
  • - In a randomized trial involving 66 patients, results showed no significant difference in pulmonary edema reduction or clinical outcomes between imatinib and placebo groups, although imatinib was found to be safe.
  • - Interestingly, a subset of patients with high levels of specific inflammatory markers did benefit from imatinib treatment, indicating that targeted approaches may improve outcomes in certain ARDS patients.
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Article Synopsis
  • The CounterCOVID study demonstrated that oral imatinib treatment resulted in improved clinical outcomes and reduced mortality in COVID-19 patients compared to a placebo, with notable elevated levels of alpha-1 acid glycoprotein (AAG) impacting drug concentrations.
  • This post-hoc analysis aimed to compare the drug exposure of imatinib in COVID-19 patients versus cancer patients, hypothesizing that higher drug exposure in severe COVID-19 cases would enhance treatment outcomes.
  • Results indicated that COVID-19 patients had significantly higher imatinib concentrations than cancer patients, with certain exposure parameters showing significant associations with clinical outcomes, thereby suggesting that higher drug levels could improve recovery metrics in COVID-19 patients.
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Methylphenidate (MPH) is highly efficacious in reducing symptoms of attention-deficit/hyperactivity disorder (ADHD) in children. Generally increased doses are found to result in better symptom control; however, it remains unclear whether this pattern can be observed at the individual level, given the large heterogeneity in individual dose-response relationships and observed placebo responses. A double-blind, randomized, placebo-controlled cross-over trial was used to compare weekly treatment with placebo and 5, 10, 15 and 20 mg of MPH twice daily on parent and teacher ratings of child ADHD symptoms and side effects.

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Background: Cognitive side-effects are an important reason for the limited use of electroconvulsive therapy (ECT). Cognitive side-effects are heterogeneous and occur frequently in older persons. To date, insight into these side-effects is hampered due to inconsistencies in study designs and small sample sizes.

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An accurate estimated glomerular filtration rate (eGFR) is essential in drug dosing. This study demonstrates the limitations of indexed (ml/min/1.73 m ) and de-indexed (ml/min) eGFR based drug dosing in patients with obesity or underweight.

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Article Synopsis
  • - Vitamin D deficiency is common in COPD patients, and the study aimed to evaluate whether vitamin D supplementation could help reduce exacerbation rates in these individuals.
  • - A year-long randomized controlled trial involved COPD patients who received either vitamin D3 or a placebo, with their health outcomes measured over time.
  • - The results indicated that vitamin D supplementation did not significantly impact the exacerbation rate or other secondary health measures in the participants, regardless of their initial vitamin D levels.
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What Is Known And Objective: The recently conducted Medication Actions to Reduce hospital admissions through a collaboration between Community and Hospital pharmacists (MARCH) transitional care programme, which aimed to test the effectiveness of a transitional care programme on the occurrence of ADEs post-discharge, did not show a significant effect. To clarify whether this non-significant effect was due to poor implementation or due to ineffectiveness of the intervention as such, a process evaluation was conducted. The aim of the study was to gain more insight into the implementation fidelity of MARCH.

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Background: The coronavirus disease 2019 (COVID-19) pandemic has led to a disruptive increase in the number of intensive care unit (ICU) admissions with acute respiratory distress syndrome (ARDS). ARDS is a severe, life-threatening medical condition characterized by widespread inflammation and vascular leak in the lungs. Although there is no proven therapy to reduce pulmonary vascular leak in ARDS, recent studies demonstrated that the tyrosine kinase inhibitor imatinib reinforces the endothelial barrier and prevents vascular leak in inflammatory conditions, while leaving the immune response intact.

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Ulipristal acetate (UPA) is a medical treatment for uterine fibroids and was authorized for surgical pre-treatment in 2012 after the conduct of the PEARL I and II randomized controlled trials and for intermittent treatment after the observational PEARL III and IV trials. However, UPA came into disrepute due to its temporary suspension in 2017 and 2020 because of an apparent association with liver injury. This clinical opinion paper aims to review the process of marketing authorization and implementation of UPA, in order to provide all involved stakeholders with recommendations for the introduction of future drugs.

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This study aimed to determine whether published pharmacokinetic (PK) models can adequately predict the PK profile of imatinib in a new indication, such as coronavirus disease 2019 (COVID-19). Total (bound + unbound) and unbound imatinib plasma concentrations obtained from 134 patients with COVID-19 participating in the CounterCovid study and from an historical dataset of 20 patients with gastrointestinal stromal tumor (GIST) and 85 patients with chronic myeloid leukemia (CML) were compared. Total imatinib area under the concentration time curve (AUC), maximum concentration (C ) and trough concentration (C ) were 2.

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Objective: Neurocognitive deficits are at the heart of explanatory models of attention-deficit/hyperactivity disorder (ADHD), and lead to significant impairments in daily life. Determining the dosing effects of methylphenidate (MPH) on a broad range of neurocognitive functions and investigating possible impairing effects of high doses is therefore important.

Method: Placebo-controlled trials were included that investigated MPH dosing effects on neurocognitive functions in children and adolescents (aged 5-18 years) diagnosed with ADHD.

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Background: The major complication of COVID-19 is hypoxaemic respiratory failure from capillary leak and alveolar oedema. Experimental and early clinical data suggest that the tyrosine-kinase inhibitor imatinib reverses pulmonary capillary leak.

Methods: This randomised, double-blind, placebo-controlled, clinical trial was done at 13 academic and non-academic teaching hospitals in the Netherlands.

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Introduction: Transitional care programs (i.e. interventions delivered both in hospital and in primary care), could increase continuity and consequently quality of care.

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Purpose: The coronavirus disease 2019 (COVID-19) pandemic resulted in accelerated market access to remdesivir worldwide. Therefore, data about complications experienced during use of the drug are limited. This is the first published case series (1 case report exists) to describe remdesivir infiltration in 3 patients with COVID-19.

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Background: Interpatient variability in cytochrome P450 2D6 (CYP2D6) enzyme activity alters the serum concentrations of most psychotropics, which often have narrow therapeutic indices. Therefore, preemptive knowledge of CYP2D6 activity is desired. However, accessible indicators for deficient CYP2D6 activity are necessary because genotyping all patients prescribed CYP2D6 metabolized drugs is often not feasible or cost-effective.

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Aims: Uterine fibroids are benign tumours that cause various complaints. These complaints may significantly compromise quality of life, necessitating a clinical intervention in 25-50% of the affected women. Hysterectomy, myomectomy or embolization may offer symptomatic relief, but are costly, include a recovery period, can cause serious side-effects, sometimes fail to treat symptoms completely and are not always desired by patients.

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