Interim analyses and sequential designs in phase III studiesTodd, S. ORCID: https://orcid.org/0000-0002-9981-923X, Whitehead, A., Stallard, N. and Whitehead, J. (2001) Interim analyses and sequential designs in phase III studies. British Journal of Clinical Pharmacology, 51 (5). pp. 394-399. ISSN 0306-5251 Full text not archived in this repository. It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing. To link to this item DOI: 10.1046/j.1365-2125.2001.01382.x Abstract/SummaryRecruitment of patients to a clinical trial usually occurs over a period of time, resulting in the steady accumulation of data throughout the trial's duration. Yet, according to traditional statistical methods, the sample size of the trial should be determined in advance, and data collected on all subjects before analysis proceeds. For ethical and economic reasons, the technique of sequential testing has been developed to enable the examination of data at a series of interim analyses. The aim is to stop recruitment to the study as soon as there is sufficient evidence to reach a firm conclusion. In this paper we present the advantages and disadvantages of conducting interim analyses in phase III clinical trials, together with the key steps to enable the successful implementation of sequential methods in this setting. Examples are given of completed trials, which have been carried out sequentially, and references to relevant literature and software are provided.
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