Pharmacogenomic of Atazanavir/Efavirenz (ATV/EFV)

Study Overview
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Brief Summary
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Objectives: To evaluate the impact of genetic polymorphism on ARV drug levels To evaluate the effect of genetic polymorphism/drug levels on long term immunologic and virologic response To correlate the genetic polymorphism/drug levels on antiretroviral toxicities The long-term objective of this research plan is to characterize impact of pharmacogenomics to HIV drug concentration, toxicities, and response to antiretroviral therapy among HIV-infected adults. A comprehensive understanding of the impact of pharmacogenomics to HIV infection and HIV medication will lead to the development of appropriate intervention such as dose reduction strategies in patients with particular gene(s) correlated with higher drug levels. The dose reduction strategy will decrease long term drug toxicity and cost saving for Thais and Asian Ethnicities.

Detailed Description
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The overall goal of this study is to characterize role of pharmacogenomic on ARV drug (atazanavir, and efavirenz) levels, its toxicities, and its long term efficacy among HIV-infected adults in Thailand. The specific aims are (1) to evaluate the impact of genetic polymorphism on ARV drug levels (2) to evaluate the effect of genetic polymorphism/ drug levels on long term immunologic and virologic response (3) to correlate the genetic polymorphism/drug levels on antiretroviral toxicities. The proposed study will be analysed in stored samples of the well-established cohort of long-term follow-up study for HIV-infected patients participated in HIV-NAT study protocols, the HIV-NAT006 study. This cohort provide us unique opportunity to study impact of pharmacogenomics on long term treatment response and long term drug toxicities since this cohort was started in 1996. Furthermore, the important factors include ARV regimen, drug toxicities, PBMC, immunological and virological parameters have been collected every 6 months basis in HIV-NAT006 study. A comprehensive understanding of the impact of pharmacogenomics to HIV infection and HIV medication will lead to development of appropriate intervention, particularly, dose reduction strategy in patient with particular gene correlated with greater drug levels. The dose reduction strategy will decrease long term drug toxicity and cost saving for Thai and Asian Ethnicity.

Official Title
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Impact of Pharmacogenomics on Antiretroviral Drugs (Atazanavir and Efavirenz) Concentration and Treatment Response in HIV-infected Adults Study-team

Conditions
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HIV Infections

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Inclusion criteria for pharmacogenomic of ATV: On low-dose ATV/r at the time blood samples are collected for ATV drug levels Age > 18 years of age or older with HIV-1 infection Provided consent form Inclusion criteria for pharmacogenomic of EFV: On EFV at the time blood samples are collected for EFV levels Age > 18 years of age or older with HIV-1 infection Patients who were on EFV but later switched to another ARV regimen due to toxicity of EFV and have stored sample at time of taking EFV Provided consent form Exclusion Criteria: Exclusion criteria for both ATV and EFV Inability to understand the nature and extent of the study and the procedures required. Contramedication such as rifampin, proton pump inhibitor (for ATV), etc Pregnancy during blood drawn for EFV or ATV drug levels Known renal insufficiency or cirrhosis during blood drawn for EFV or ATV drug levels

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Frequency of MDR1-3435 allele variants,MDR1-2677 allele variants,UGT1A1 allele variants, frequency of CYP 2B6 variants in efavirenz treatment and compare candidate gene and treatment response of ATV/r or EFV |  | 2 years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Compare drug conc. of UGT1A1 variant with bilirubin, drug conc. & treatment resp. of ATV/r or EFV, drug conc.for WT, drug conc.for 2B6 variant with EFV toxicity & drug discontinuation, drug conc.or 2B6 variant with long term efficacy & EFV resistance |  | 2 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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pharmacogenomics, ATV, EFV, pharmacogenomics of ATV and EFV