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We list hundreds of Clinical Trials about "CYP2D6 Genotype on the Clinical Effect of Tamoxifen" on BioPortfolio. We draw our references from global clinical trials data listed on ClinicalTrials.gov and refresh our database daily.
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The purpose of this study is to investigate the impact of CYP2D6 Genotype on the clinical effects of tamoxifen using with samples from prospective randomized multicenter study(ASTRRA).
Tamoxifen is an important drug for the treatment of breast cancer. Used adjuvantly after operation in early breast cancer, tamoxifen reduces annual recurrence rate by half and cancer death by one third. Used preventatively it also reduces the risk of breast cancer by 50% in women at high risk for developing the disease Tamoxifen needs to be activated in the body to an active form called endoxifen, mainly by the enzyme called CYP2D6. Patients have variable capability to activate...
Aim of work: 1. To estimate the frequency of Cyp2D6*1 and *4 alleles in Egyptian patients maintained on tamoxifen (20 mg/day) for management of ER +ve breast cancer. 2. To measure levels of tamoxifen, 4-hydroxy tamoxifen, N-desmethyl-tamoxifen and 4- hydroxyl-N-desmethyl-tamoxifen (endoxifen) in the serum of these patients. 3. To correlate between the levels of tamoxifen/active metabolite enoxifen ratio and CYP2D6*1,*4 genotyping. 4. To in...
The aim of the study is to examine whether tamoxifen-treated Israeli breast cancer patients who are CYP2D6 poor metabolizers (CYP2D6*4/*4 genotype) are at higher cancer relapse risk during 2.5-5-year follow-up period from initial diagnosis and primary treatment.
This study is an observational study to determine phenotype and genotype of CYP2D6 as predictors of z-endoxifen concentrations in plasma of outgoing patients treated with tamoxifen for at least 4 months
Primary objectives of this study is to evaluate the effects of CYP2D6 genotypes on time to progression after tamoxifen treatment in pre- or postmenopausal women with metastatic breast cancer. Furthermore, we will evaluate the effects of CYP2D6 genotypes on clinical benefit and response duration to tamoxifen administration in pre- or postmenopausal women with metastatic breast cancer and also evaluate the effects of CYP2D6 genotypes on the steady state plasma concentration of ta...
The investigators plan to examine endoxifen and 4-OH-Tam as a function of the tamoxifen dose in patients with a genetic CYP2D6 polymorphism. The investigators also plan to investigate other genetic variations in the metabolism of tamoxifen.
We hypothesized that subjects with CYP2D6*10 alleles may have a lower steady state levels of endoxifen due to reduced conversion of tamoxifen to endoxifen. Primary objectives: - To determine the steady state pharmacokinetics of tamoxifen and its metabolites - To test the effects of genetic polymorphisms of CYP2D6 on plasma concentration of tamoxifen and its metabolites in hormone receptor positive women who are taking tamoxifen as adjuvant treatment for...
CYP2D6 is characterized by a huge variability in the general population, mainly because of genetic polymorphism and drug-drug interactions (DDIs). CYP2D6 genotype is known to have an impact on the extent of DDIs. Indeed several studies have pointed out differential DDIs extent according to CYP2D6 genotype. The terms phenoconversion and phenotype switch are both used to describe the phenomenon by which a given subject changes his phenotype to another due external influence such ...
The aim of the study is to examine whether determining treatment strategies based upon Cytochrome P450 2D6 (CYP2D6) genotype will improve drug response rates and clinical outcome in patients with psychosis. The investigators predict that prospectively testing CYP2D6 genotype and using this information to treat psychotic patients with risperidone will improve clinical outcomes. Specifically, CYP2D6 poor metabolizers who are treated with low dose and slow titration of risp...
This clinical trial is designed to be a multi-center prospective, parallel-controlled Phase III clinical study. In this study, the efficacy of tamoxifen versus toremifene shall be compared in CYP2D6 intermediate/poor metabolizers of premenopausal patients with estrogen receptor-positive early breast cancer.
This will be a randomized, open-labeled pilot pragmatic clinical trial. Patients undergoing arthroplasty surgery will be recruited for CYP2D6 pharmacogenetic testing from UF Health Orthopaedic clinic to manage post-surgical pain. Patient will be randomized to either usual care of genotype-guided care.
This Randomized Clinical Trial (RCT) compares outcomes in 1500 patients with major depressive disorder (MDD) treated according to the patient's CYP2D6 genotype status (N=1000) versus empiric "standard-of-care" psychotropic therapy (N=500). The hypothesis is that provision of medication based on the functional status of the patient's CYP2D6 enzyme inferred from genotype results within 48 hours of admission to treating clinicians will, through refined selection of psychotropic m...
This is a multicenter, randomized, open-label, parallel, active-controlled superiority clinical study conducted in early premenopausal estrogen-receptor positive breast cancer patients with CYP2D6*10 mutations. The efficacy and safety of Exemestane Tablets combined with ovarian function suppression/ablation and Tamoxifen Tablets combined with ovarian function suppression/ablation in the treatment of early premenopausal estrogen-receptor positive breast cancer patients with CYP2...
The cytochrome P450 (CYP) is a group of metabolic enzymes, from which the 2D6 and CYP2C19 polymorphisms are specifically related to the metabolism of psychiatric drugs. The prevalence of CYP2D6 and CYP2C19 polymorphisms differs among ethnicities. Depending on the number of functional alleles, individuals are classified as Poor Metabolizer (PM), Intermediate Metabolizer (IM), Extensive Metabolizer (EM) or Ultra Rapid Metabolizer (UM). Research has suggested that PM genotype is ...
Pain is one of the most burdensome symptoms associated with cancer and its treatment, and opioids are the cornerstone of clinical pain management in cancer patients. Yet, individual patient responses to opioids vary widely, and the patient's genotype contributes to this variability. Specifically, cytochrome P450 2D6 (CYP2D6) genotype has important relevance for response to opioid analgesics that depend on CYP2D6 for bioactivation. Poor metabolizers (PMs) have lower concentratio...
The purpose of this research is to try to identify which women who take tamoxifen are likely to suffer from hot flashes or are more likely to have other side effects or benefits from the drug. The researchers will do so by determining whether there are mutations that normally occur in human DNA that might influence the way individuals respond to medications.
Many methods to detect CYP2D6 poor metabolizers have been validated. Some of them are based on phenotyping (metabolism of dextromethorphan or debrisoquine) and some others on genotyping. Up to now, CYP2D6 pharmacogenetics has been restricted to the field of research, in spite of poor metabolizer profile concerns 5 to 10 % of caucasian population. Nevertheless, the polymorphism of CYP2D6 is responsible for the metabolism of many drugs, particularly of two opioids involved in pai...
Specific Aim: To investigate if isotretinoin (13-cis-retinoic acid) administration decreases CYP2D6 activity in adolescent patients.
This study will be an open-label prospective observational trial designed to test associations between polymorphisms of candidate genes and tamoxifen. Pre- and post-menopausal women taking tamoxifen as standard therapy or chemopreventive therapy will be included in this study.
Cancer of the gullet (oesophagus) is a lethal disease in which only 15% of patients survive 5 years once diagnosed. It is more common in men than women, and men appear to have a worse prognosis. One suggestion for this gender difference is the sex hormone oestrogen, which exerts its effect via oestrogen receptors. The role of oestrogen in breast cancer is well described, and antioestrogen medication such as tamoxifen, which blocks oestrogen receptors are in widespread and effec...
The study will examine whether changes in background parenchymal uptake (BPU) on molecular breast imaging (MBI) can be induced by short-term use of low-dose tamoxifen. Women who have previously had high BPU on MBI will be recruited. Participants will take low-dose tamoxifen for a 30-day period, with post-tamoxifen MBI in order to investigate the impact of tamoxifen on BPU.
Pupillometry will be performed before administration of tramadol, at T0 and then 1 to twice per hour in children having received tramadol as a pain killer as part of his/her routine care. Pupillometry measurement will be correlate to CYP2D6 phenotype and CYP2D6 genetic score
To assess the effect of ARIMIDEX on the pharmacokinetics of tamoxifen and the effects of tamoxifen on the pharmacokinetics of ARIMIDEX..
Duchenne muscular dystrophy (DMD) is a progressive devastating disease that affects mainly boys, with an incidence of about 1:3,500 live births. The pathology of DMD is a result of non-repaired muscle damage that leads to muscle-tissue replacement by scar tissue, a process known as fibrosis. Currently, there is no effective treatment for the disease. The only therapy offered to these boys are steroids which slightly delayed the disease progression. The boys lose their ability t...