Trial reportPloS one2013
Importance of ethnicity, CYP2B6 and ABCB1 genotype for efavirenz pharmacokinetics and treatment outcomes: a parallel-group prospective cohort study in two sub-Saharan Africa populations.
Trial report in PloS one, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 70 papers, 2 of them syntheses that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
70 citing papers in PubMed, 2 syntheses or guidelines pooled it, 124 citations in OpenAlex.
- Inter-ethnic differences in pharmacokinetics-is there more that unites than divides?Pharmacology research & perspectives · 2021Pooled it
- Recruitment of Yoruba families from Nigeria for genetic research: experience from a multisite keloid study.BMC medical ethics · 2014Pooled it
- Early or deferred initiation of efavirenz during rifampicin-based TB therapy has no significant effect on CYP3A induction in TB-HIV infected patients.British journal of pharmacology · 2021Trial
- Population pharmacokinetics of abacavir and lamivudine in severely malnourished human immunodeficiency virus-infected children in relation to treatment outcomes.British journal of clinical pharmacology · 2019Trial
- Variability of efavirenz plasma concentrations among pediatric HIV patients treated with efavirenz based combination antiretroviral therapy in Dar es Salaam, Tanzania.BMC pharmacology & toxicology · 2018Trial
- Clinical and pharmacogenomic implications of genetic variation in a Southern Ethiopian population.The pharmacogenomics journal · 2015Trial
- Immunological Determinants of Oncogenic Virus-Driven Cancers in Africa: Mechanisms, Co-Infections and Public Health Challenges.Pathogens (Basel, Switzerland) · 2026Review
- Building Sub-Saharan African PBPK Populations Reveals Critical Data Gaps: A Case Study on Aflatoxin B1.Toxins · 2025Article
- Opportunities and Challenges of Population Pharmacogenomics.Annals of human genetics · 2025Review
- Biomarker-Driven Pharmacokinetics and Efficacy of Polymyxin B in Critically Ill Patients with XDR-GN Pneumonia.Pharmaceuticals (Basel, Switzerland) · 2025Article
- Sub- and supratherapeutic efavirenz plasma concentrations with risk for HIV therapy failure are mainly genetically explained in Ugandan children: The prospective GENEFA cohort study.British journal of clinical pharmacology · 2025Article
- CYP2C19 and CYP2J2 genotypes predict praziquantel plasma exposure among Ethiopian school-aged children.Scientific reports · 2024Article
- Variability in plasma rifampicin concentrations and role ofInfectious diseases (London, England) · 2024Article
- 'Research ethics · 2024Article
- Article
- The Role of Pharmacogenomics Studies for Precision Medicine Among Ethiopian Patients and Their Clinical Implications: A Scoping Review.Pharmacogenomics and personalized medicine · 2024Article
- Research Participants' Preferences for Individual Results of Pharmacogenomics Research: A Case of a Ugandan HIV Research Institute.Journal of empirical research on human research ethics : JERHRE · 2023Article
- Genetic and non-genetic factors influencing efavirenz population pharmacokinetics among human immunodeficiency virus-1-infected children in Ethiopia.CPT: pharmacometrics & systems pharmacology · 2023Article
- A Systematic Review on Antimicrobial Pharmacokinetic Differences between Asian and Non-Asian Adult Populations.Antibiotics (Basel, Switzerland) · 2023Review
- Effect of pharmacogenetic variations on praziquantel plasma concentration and safety outcomes among school children in Rwanda.Scientific reports · 2023Article
10 more citing papers are in PubMed but not listed here.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
14 authors at 4 institutions in 4 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectivesWe evaluated the importance of ethnicity and pharmacogenetic variations in determining efavirenz pharmacokinetics, auto-induction and immunological outcomes in two African populations.
methodsART naïve HIV patients from Ethiopia (n = 285) and Tanzania (n = 209) were prospectively enrolled in parallel to start efavirenz based HAART. CD4+ cell counts were determined at baseline, 12, 24 and 48 weeks. Plasma and intracellular efavirenz and 8-hydroxyefvairenz concentrations were determined at week 4 and 16. Genotyping for common functional CYP2B6, CYP3A5, ABCB1, UGT2B7 and SLCO1B1 variant alleles were done.
resultPatient country, CYP2B6*6 and ABCB1 c.4036A>G (rs3842A>G) genotype were significant predictors of plasma and intracellular efavirenz concentration. CYP2B6*6 and ABCB1 c.4036A>G (rs3842) genotype were significantly associated with higher plasma efavirenz concentration and their allele frequencies were significantly higher in Tanzanians than Ethiopians. Tanzanians displayed significantly higher efavirenz plasma concentration at week 4 (p<0.0002) and week 16 (p = 0.006) compared to Ethiopians. Efavirenz plasma concentrations remained significantly higher in Tanzanians even after controlling for the effect of CYP2B6*6 and ABCB1 c.4036A>G genotype. Within country analyses indicated a significant decrease in the mean plasma efavirenz concentration by week 16 compared to week 4 in Tanzanians (p = 0.006), whereas no significant differences in plasma concentration over time was observed in Ethiopians (p = 0.84). Intracellular efavirenz concentration and patient country were significant predictors of CD4 gain during HAART.
conclusionWe report substantial differences in efavirenz pharmacokinetics, extent of auto-induction and immunologic recovery between Ethiopian and Tanzanian HIV patients, partly but not solely, due to pharmacogenetic variations. The observed inter-ethnic variations in efavirenz plasma exposure may possibly result in varying clinical treatment outcome or adverse event profiles between populations.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.