11.07.2015 Views

Clinical Trials

Clinical Trials

Clinical Trials

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■■❚❙❘Chapter 27InteractionDuolao Wang, Tim Clayton, and Ameet BakhaiInteraction effects in clinical trials occur when a subject’sresponse to a treatment varies according to the level of anothervariable such as age or gender. Identifying and understandingthe real interaction effects can help us target therapies tosubgroups of patients who may benefit most. In this chapter,we review the basis of this most important concept anddescribe different types of interaction effects in clinical trials.We also describe how an interaction effect can be evaluatedand interpreted within a framework of a regression model.305

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