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Methods for proper handling of overrunning and underrunning in phase II designs for oncology trials

Phase II studies in oncology are frequently conducted as two-stage single-arm trials with a binary endpoint indicating tumor response. As a common feature of these designs, the sample sizes of the two stages and the decision rules for the interim and the final analysis have to be pre-specified and a...

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Hauptverfasser: Englert, Stefan (VerfasserIn) , Kieser, Meinhard (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 17 March 2015
In: Statistics in medicine
Year: 2015, Jahrgang: 34, Heft: 13, Pages: 2128-2137
ISSN:1097-0258
DOI:10.1002/sim.6479
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1002/sim.6479
Verlag, lizenzpflichtig, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/sim.6479
Volltext
Verfasserangaben:Stefan Englert and Meinhard Kieser

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520 |a Phase II studies in oncology are frequently conducted as two-stage single-arm trials with a binary endpoint indicating tumor response. As a common feature of these designs, the sample sizes of the two stages and the decision rules for the interim and the final analysis have to be pre-specified and adhered to strictly during the course of the trial in order to assure control of the type I error rate. In practice, however, the attained sample sizes often deviate from the planned ones leading to the situation of overrunning or underrunning. The currently available approaches to deal with this problem are either based on assumptions that are rarely met in practice or do not guarantee that the significance level is kept. However, strict control of the type I error rate plays an important role also for single-arm cancer trials, as they are frequently a fundamental part of the registration information. We propose a general methodology that allows handling both unintentional and intentional overrunning and underrunning while strictly controlling the type I error rate. Application of the proposed procedure and some of its characteristics are illustrated with a real phase II oncology trial. Copyright © 2015 John Wiley & Sons, Ltd. 
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