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000144259 1001_ $$0P:(DE-He78)bb6a7a70f976eb8df1769944bf913596$$aKopp-Schneider, Annette$$b0$$eFirst author$$udkfz
000144259 245__ $$aPower gains by using external information in clinical trials are typically not possible when requiring strict type I error control.
000144259 260__ $$aBerlin$$bWiley-VCH$$c2020
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000144259 520__ $$aIn the era of precision medicine, novel designs are developed to deal with flexible clinical trials that incorporate many treatment strategies for multiple diseases in one trial setting. This situation often leads to small sample sizes in disease-treatment combinations and has fostered the discussion about the benefits of borrowing of external or historical information for decision-making in these trials. Several methods have been proposed that dynamically discount the amount of information borrowed from historical data based on the conformity between historical and current data. Specifically, Bayesian methods have been recommended and numerous investigations have been performed to characterize the properties of the various borrowing mechanisms with respect to the gain to be expected in the trials. However, there is common understanding that the risk of type I error inflation exists when information is borrowed and many simulation studies are carried out to quantify this effect. To add transparency to the debate, we show that if prior information is conditioned upon and a uniformly most powerful test exists, strict control of type I error implies that no power gain is possible under any mechanism of incorporation of prior information, including dynamic borrowing. The basis of the argument is to consider the test decision function as a function of the current data even when external information is included. We exemplify this finding in the case of a pediatric arm appended to an adult trial and dichotomous outcome for various methods of dynamic borrowing from adult information to the pediatric arm. In conclusion, if use of relevant external data is desired, the requirement of strict type I error control has to be replaced by more appropriate metrics.
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000144259 7001_ $$0P:(DE-HGF)0$$aCalderazzo, Silvia$$b1
000144259 7001_ $$0P:(DE-He78)1042737c83ba70ec508bdd99f0096864$$aWiesenfarth, Manuel$$b2$$eLast author$$udkfz
000144259 773__ $$0PERI:(DE-600)1479920-0$$a10.1002/bimj.201800395$$gp. bimj.201800395$$n2$$p361-374$$tBiometrical journal$$v62$$x1521-4036$$y2020
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