Antiretroviral Resistance Detection by Ultrasensitive Pyrosequencing of the HIV-1 Genome and Virological Response to Antiretroviral Rescue Treatment
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 143
- 试验地点
- 4
- 主要终点
- Time to virological failure
研究概览
简要总结
This study aims to analyze the association between the baseline detection of resistance mutations through Ultra deep Sequencing (UDS) and the virological outcome of salvage antiretroviral therapy, in comparison with conventional genotypic resistance tests. Based on the data generated in this study, new resistance interpretation tools and algorithms will be developed to improve the prediction of antiretroviral therapy outcomes. The final aim of the study is to improve the clinical care of HIV-1-infected patients through the incorporation of improved new antiretroviral resistances tests in the clinical practice.
详细描述
Antiretroviral resistance testing is an essential tool for the clinical management of Human Immunodeficiency Virus (HIV-1)-infected persons and HIV surveillance in the community. In the absence of appropriate treatment, HIV-1 infection leads toward the collapse of the immune system and death of most HIV-1-infected persons. Adequate antiretroviral treatment usually reverses this process. Nevertheless, HIV-1 easily develops treatment resistance through the accumulation of mutations in its genome. This causes treatment failure, and the requirement of increasingly complex, toxic and expensive treatments. Resistant viruses can be transmitted to other persons. More than 10 % of HIV-1-positive persons in Spain become infected with viruses that are already resistant to at least one antiretroviral drug. Antiretroviral treatment regimens designed on the basis of drug resistance information are more efficacious, effective and efficient.
In spite of their clinical relevance, however, conventional resistance tests are insensitive and underestimate antiretroviral resistance. By means of new ultrasensitive resistance tests it is possible to detect resistant viruses in minority populations that remain undetected by conventional genotypic tests. Ultrasensitive resistance tests thus double or triple the number of patients in whom antiretroviral resistance is detected. It is important to emphasize that detection of minority resistant mutants in antiretroviral naïve patients increases more than triples the risk of virological failure. The clinical impact of detecting minority resistant variants in treatment-experienced patients with therapeutic failure remains unknown.
Recently developed techniques of parallel emulsion sequencing of thousands of amplicon clones (Ultra deep Sequencing (UDS), Roche Diagnostics/454 Life Sciences) increase the sensibility to detect polymorphisms and mutations in highly variable genomes such as in HIV-1 in several orders of magnitude. In addition, this technique allows stablishing genetic linkage of such mutations and polymorphisms in thousands of HIV-1 clonal sequences for every patient and point of follow-up. This generates an unprecedented opportunity to characterize the nature of HIV-1 variability and the physiopathology of antiretroviral resistance in depth. Ultrasensitive resistance tests hold the promise of improving the clinical management of HIV-1 seropositive patients, avoiding unnecessary toxicities, improving epidemiological estimations of antiretroviral resistance, improving the knowledge of the pathogenesis of HIV-1 infection and antiretroviral resistance, and improving the cost-efficiency of HIV-related pharmaceutical cost.
This study aims to analyze the association between the baseline detection of resistance mutations through UDS and the virological outcome of salvage antiretroviral therapy, in comparison with conventional genotypic resistance tests. Based on the data generated in this study, new resistance interpretation tools and algorithms will be developed to improve the prediction of antiretroviral therapy outcomes. The final aim of the study is to improve the clinical care of HIV-1-infected patients through the incorporation of improved new antiretroviral resistances tests in the clinical practice.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Retrospective
入排标准
- 年龄范围
- 18 Years 至 65 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Adults over 18 years old, HIV +, distributed in one of the following 3 treatment groups:
- •PI GROUP: prior virologic failure of a HAART regimen including a PI (ritonavir boosted or not), and a second consecutive start HAART regimen including a PI boosted with ritonavir + 2 NRTIs. The 6 months prior to the start of the second HAART regimen, are considered as a baseline.
- •NNRTI GROUP: Virologic failure after a HAART regimen that includes 1 NNRTI and 2 NRTIs, and beginning, consecutive or not, a rescue HAART regimen with etravirine, in combination with any other drug. The 6 months before starting rescue HAART regimen with etravirine, are considered as a baseline.
- •II GROUP: Virologic failure to any prior HAART and initiation of rescue HAART including raltegravir, in combination with any other drug. The 6 months before starting rescue HAART with raltegravir are considered as a baseline.
- •Sample of 1 mL of plasma available for pyrosequencing before starting rescue HAART.
- •Viral load of HIV-1 > 5,000 copies / mL at the time of obtaining the plasma sample.
- •Any CD4 + count.
- •Availability of clinical follow-up, viral load of HIV-1 and quarterly CD4 counts to at least 48 weeks after initiation of rescue HAART.
- •Good adherence to therapy.
- •The investigation period is in any event before the start of the study.
排除标准
- •HIV-2 infection or HIV-1 subtype non-B.
- •Poor adherence to therapy.
- •Lack of adequate clinical and laboratory follow up.
- •Non-compliance of the patient to participate in the study.
结局指标
主要结局
Time to virological failure
时间窗: One year
次要结局
- Cost-benefit analysis of minority mutant detection by ultrasensitive pyrosequencing.(Week 48)
- Area under curve of viral load(week 24 and 48)
- CD4 increase(week 24 and 48)
- Comparison of virological failure rate associated with baseline genotypic resistance detection by conventional sequencing and ultrasensitive pyrosequencing of the HIV-1 genome.(One year)
- Absolute decrease of viral load(week 24 and 48)
- Proportion of patients with VL <50 and <200 copies(week 12 and 48)