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On the Use of Nonparametric Curves in Phase I Trials with Low Toxicity Tolerance

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Gasparini and Eisele (2000, Biometrics56, 609–615) propose a design for phase I clinical trials during which dose allocation is governed by a Bayesian nonparametric estimate of the dose-response curve. The authors also suggest an elicitation algorithm to establish vague priors. However, in situations where a low percentile is targeted, priors thus obtained can lead to undesirable rigidity given certain trial outcomes that can occur with a nonnegligible probability. Interestingly, improvement can be achieved by prescribing slightly more informative priors. Some guidelines for prior elicitation are established using a connection between this curve-free method and the continual reassessment method.
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Keywords: Bayesian nonparametric estimation; Continual reassessment method

Document Type: Research Article

Affiliations: Division of Biostatistics, School of Public Health, Columbia University, New York, New York 10032, U.S.A., Email: [email protected]

Publication date: 2002-03-01

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