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分类依据与纠错

AI 根据所提供的论文材料归类:摘要以临床试验处理效应的估计与检验为核心,并调整随时间变化的安慰剂效应。

反馈分类问题

正在核对关联版本…

代码、数据与补充材料

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关注这篇论文的作者
Tianyu Zhan
Yihua Gu

时变安慰剂效应确证性临床试验中的半参数加权样条回归

研究问题
在跨多年招募的确证性临床试验中,如何处理未知的安慰剂效应时间漂移,使处理效应推断兼顾错误率、功效与稳健性?
方法与思路
作者提出半参数加权样条回归,以 B 样条非参数刻画时变安慰剂效应并估计处理效应,使用模拟和临床案例评估表现。
材料陈述的贡献
摘要称模拟与案例支持其控制第一类错误、保持较高功效并适应未知时间趋势的目标,且提供代码和补充理论讨论。
阅读关注点
核对权重来源、样条复杂度选择、时间与处理分配的关系,以及检验校准和预先指定分析方案所需的具体条件。
阅读边界
这是 arXiv 预印本,同行评审及期刊接收均未核实;摘要未给出错误率与功效数值,不能确认任意时间漂移下均有稳健保证。

原文摘要

In confirmatory Phase 3 clinical trials with recruitment over the years, the underlying placebo effect may follow an unknown temporal trend. Taking a clinical trial on Hidradenitis Suppurativa (HS) as an example, fluctuations or variabilities are common in HS-related endpoints, mainly due to the natural disease characteristics, variations of evaluation from different physicians, and standard of care evolvement. The adjustment of time-varying placebo effects receives some attention in adaptive clinical trials and platform trials, but is usually ignored in traditional non-adaptive designs. However, under the impact of such a time drift, some existing methods may not simultaneously control the type I error rate and achieve satisfactory power. In this article, we propose SWSR (Semiparametric Weighted Spline Regression) to estimate the treatment effect with B-splines to accommodate the time-varying placebo effects nonparametrically. Our method aims to achieve the following three objectives: a proper type I error rate control under varying settings, an overall high power to detect a potential treatment effect, and robustness to unknown time-varying placebo effects. Simulation studies and a case study provide supporting evidence. Those three key features make SWSR an appealing option to be pre-specified for practical confirmatory clinical trials. Supplemental materials, including the R code, additional simulation results and theoretical discussion, are available online.

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