Improved inference for MCP‐Mod approach using time‐to‐event endpoints with small sample sizes

Autor: Márcio A. Diniz, Diego I. Gallardo, Tiago M. Magalhães
Rok vydání: 2023
Předmět:
Zdroj: Pharmaceutical Statistics.
ISSN: 1539-1612
1539-1604
DOI: 10.1002/pst.2303
Popis: The Multiple Comparison Procedures with Modeling Techniques (MCP-Mod) framework has been recently approved by the U.S. Food and Administration and European Medicines Agency as fit-per-purpose for phase II studies. Nonetheless, this approach relies on the asymptotic properties of Maximum Likelihood (ML) estimators, which might not be reasonable for small sample sizes. In this paper, we derived improved ML estimators and correction for their covariance matrices in the censored Weibull regression model based on the corrective and preventive approaches. We performed two simulation studies to evaluate ML and improved ML estimators with their covariance matrices in (i) a regression framework (ii) the Multiple Comparison Procedures with Modeling Techniques framework. We have shown that improved ML estimators are less biased than ML estimators yielding Wald-type statistics that controls type I error without loss of power in both frameworks. Therefore, we recommend the use of improved ML estimators in the MCP-Mod approach to control type I error at nominal value for sample sizes ranging from 5 to 25 subjects per dose.
Comment: Pharmaceutical Statistics. 2023 Apr 29
Databáze: OpenAIRE
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