Clinical trial NCT03067350: Influence of a Combined Pharmacogenetic Score on Through Plasma Voriconazole Concentrations in Haematological Patients
Official title: Influence of a Combined Pharmacogenetic Score on Through Plasma Voriconazole Concentrations in Haematological Patients
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Invasive Aspergillosis
Haematological Cancer Patients
Voriconazole
Keywords: voriconazole
pharmacogenetics
pharmacokinetics
therapeutic drug monitoring
Lead sponsor: University Hospital, Grenoble
Sponsor class: OTHER
First posted: 2017-03-01
Enrollment: 47
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: patients suffering from haematological cancer Followed at the hematolofic clinic of Grenoble University Hospital Starting treatment by voriconazole whatever the route of administration

Brief summary: Hypothesis: A pharmacogenetic score integrating both CYP3A genotypes could be influence initial trough voriconazole plasma concentrations and thus useful to adapt a priori voriconazole dosing in order to get adequate voriconazole exposure as possible after starting treatment.

Main Objective: To determine predictive value of a combined pharmacogenetic score on onset of trough voriconazole plasma concentration inferior than lower therapeutic target.

Detailed description: Voriconazole (VRC), the gold-standard treatment of invasive aspergillosis is characterized by variables and nonlinear pharmacokinetics, causing many under- or over-dosing. A link exist between trough plasma concentrations (Cmin) of VRC and effectiveness but also its toxicity. Thus the longitudinal therapeutic drug monitoring of VRC is now recommended with a therapeutic range between 1 and 5 mg/L. The pharmacokinetic variability of VRC is in part explained by its metabolism, mainly dependent on cytochrome P 450 (CYP), particularly CYP2C19, 3A4, 3A5; all these CYP exhibiting genetic polymorphisms. The authors, recently shown, and for the first time , in a retrospective study conducted in 29 patients allogeneic hematopoietic stem cell that initial VRC Cmin adjusted the dose was not only influenced by the route of administration but also by a pharmacogenetics score whose determination is to assign each genotype CYP2C19 and CYP3A a score expressed in a arbitrary units.

The combined pharmacogenetic score was strongly correlated with the original Cmin (r= -0.748; p = 0.002) and was the only independent predictor of initial Cmin (after adjusting the dose and the route of administration). In addition, none of the patients having a genetic score \<2 (ie metabolizing capacity of reduced VRC) did not show an initial Cmin below 1 mg/L, while the initial Cmin was below this threshold efficiency in 47% of patients with a genetic score \>2. The aim of this new study is to confirm the impact of the pharmacogenetic score on the initial VRC Cmin over a larger prospective cohort of 60 adult patients with onco-hematological diseases.

Eligibility criteria: Inclusion Criteria:

* patients suffering from haematological cancer

Exclusion Criteria:

* less than 18-years old

Primary outcomes:
measure: number of initial voriconazole trough plasma concentration in the therapeutic range (1-4mg/l)
timeFrame: concentration measured between 5 to 10 days after voriconazole treatment initiation
Secondary outcomes:
measure: initial voriconazole trough plasma concentrations adjusted on the dose
timeFrame: concentration measured between 5 to 10 days after voriconazole treatment initiation
measure: number of patients with therapeutic success
timeFrame: 3 months after voriconazole therapy initiation
measure: number of patients with adverse effects
timeFrame: duration of voriconazole treatment (maximum length of follow-up : 3 months)
Other outcomes:
Locations:
city: Grenoble
country: France
facility: University Hospital, Grenoble Alpes
Study officials:
affiliation: University Hospital, Grenoble
name: Elodie GAUTIER
role: PRINCIPAL_INVESTIGATOR
References:
citation: Gautier-Veyret E, Fonrose X, Tonini J, Thiebaut-Bertrand A, Bartoli M, Quesada JL, Bulabois CE, Cahn JY, Stanke-Labesque F. Variability of voriconazole plasma concentrations after allogeneic hematopoietic stem cell transplantation: impact of cytochrome p450 polymorphisms and comedications on initial and subsequent trough levels. Antimicrob Agents Chemother. 2015 Apr;59(4):2305-14. doi: 10.1128/AAC.04838-14. Epub 2015 Feb 2.
citation: Gautier-Veyret E, Fonrose X, Stanke-Labesque F. A genetic score combining CYP450 2C19 and 3A4 genotypes to predict voriconazole plasma exposure? Int J Antimicrob Agents. 2016 Aug;48(2):221-2. doi: 10.1016/j.ijantimicag.2016.05.002. Epub 2016 Jun 7. No abstract available.
citation: Tonini J, Bailly S, Gautier-Veyret E, Wambergue C, Pelloux H, Thiebaut-Bertrand A, Cornet M, Stanke-Labesque F, Maubon D. Contribution of a Simple Bioassay in Effective Therapeutic Drug Monitoring of Posaconazole and Voriconazole. Ther Drug Monit. 2015 Oct;37(5):685-8. doi: 10.1097/FTD.0000000000000199.
citation: Tonini J, Thiebaut A, Jourdil JF, Berruyer AS, Bulabois CE, Cahn JY, Stanke-Labesque F. Therapeutic drug monitoring of posaconazole in allogeneic hematopoietic stem cell transplantation patients who develop gastrointestinal graft-versus-host disease. Antimicrob Agents Chemother. 2012 Oct;56(10):5247-52. doi: 10.1128/AAC.00815-12. Epub 2012 Jul 30.
citation: Jourdil JF, Tonini J, Stanke-Labesque F. Simultaneous quantitation of azole antifungals, antibiotics, imatinib, and raltegravir in human plasma by two-dimensional high-performance liquid chromatography-tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci. 2013 Mar 1;919-920:1-9. doi: 10.1016/j.jchromb.2012.12.028. Epub 2013 Jan 9.