Quantifying an Adherence Path-Specific Effect of Antiretroviral Therapy in the Nigeria PEPFAR Program
尼日利亚 PEPFAR 项目中抗逆转录病毒治疗经依从性传导的路径特定效应AI 解读 ↓
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尼日利亚 PEPFAR 项目中抗逆转录病毒治疗经依从性传导的路径特定效应
- 研究问题
- 不同抗逆转录病毒方案对病毒抑制的作用为何不同，如何分离仅经服药依从性传导、而不经药物毒性传导的效应？
- 方法与思路
- 作者采用中介与路径特定效应框架，放松既有分析中的部分混杂假设，在较弱条件下研究识别并提出相应估计量。
- 材料陈述的贡献
- 摘要称，某些路径特定效应在较弱条件下仍可识别，并给出仅经依从性而不经毒性传导的效应估计及模拟和项目数据应用。
- 阅读关注点
- 应核对毒性、依从性与治疗之间的因果结构、实际放松了哪些假设，以及目标路径效应的识别条件和估计步骤。
- 阅读边界
- 仅据 OpenAlex 索引摘要，稿件版本未注明；不能推断刊本变化。摘要未列出较弱条件，不能理解为任意未测混杂下均可识别。
原文摘要
Since the early 2000s, evidence has accumulated for a significant differential effect of first-line antiretroviral therapy (ART) regimens on human immunodeficiency virus (HIV) viral load suppression. This finding was replicated in our data from the Harvard President's Emergency Plan for AIDS Relief (PEPFAR) program in Nigeria. Investigators were interested in finding the source of these differences, i.e., understanding the mechanisms through which one regimen outperforms another, particularly via adherence. This question can be naturally formulated via mediation analysis with adherence playing the role of a mediator. Existing mediation analysis results, however, have relied on an assumption of no exposure-induced confounding of the intermediate variable, and generally require an assumption of no unmeasured confounding for nonparametric identification. Both assumptions are violated by the presence of drug toxicity. In this paper, we relax these assumptions and show that certain path-specific effects remain identified under weaker conditions. We focus on the path-specific effect solely mediated by adherence and not by toxicity and propose an estimator for this effect. We illustrate with simulations and present results from a study applying the methodology to the Harvard PEPFAR data. Supplementary materials are available online.