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Adaptive Dose-Response Studies
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Presenters
This half-day course will be taught by Christopher
Coffey (University of Alabama at Birmingham), Brenda Gaydos (Eli Lilly and Company)
and José Pinheiro (Novartis).
Abstract
Insufficient understanding of the dose response
profile of a compound is a shortcoming of clinical drug development,
often leading to incorrect dose selection for the confirmatory
phase. Indeed, failure to characterize adequate dosing early is
often cited as a key contributor to the high late-stage attrition
rate currently faced by the pharmaceutical industry. Adaptive
dose-response trials allow more efficient learning about the dose
response, for both efficacy and safety, earlier in development,
which should ultimately reduce overall costs/timelines and provide
better dosing information. Such designs may be thought of as a
subset of adaptive designs in general. The rapid proliferation
of adaptive designs, and inconsistent use of terminology, has
created confusion about the similarities and, more importantly,
the differences among the techniques. This half-day course will
clarify the differences between adaptive dose-response trials
and other types of adaptive designs, review traditional fixed
designs and adaptive dose-response designs, and provide information
on developing a Bayesian adaptive dose-response trial. Real and
simulated data examples will be used to illustrate the various
methods discussed in the course. The course is intended for anyone
with a basic understanding of statistical methods (at approximately
the 2nd year of a graduate program), basic knowledge of Bayesian
methods, and some exposure to drug development concepts.
Outline
1. What are Adaptive Designs? (Definition
of an 'adaptive design', classifications of adaptive designs,
adaptive dose-response designs).
2. Summary of Development Stages with Emphasis on Objectives for
Dose Finding (Early Exploratory Development, Late Stage Exploratory
Development, Phase II, Confirmatory Development).
3. Fixed Design Dose-Response Methods (Traditional designs, Hypothesis
testing approach based on multiple comparison methods, Modeling
approaches, Combination approaches).
4. Adaptive Dose-Response Methods for Early Exploratory Studies
(Summary of major philosophies regarding definition of maximum
tolerated dose, Conventional 3+3 Designs, Model-based designs,
Case-study).
5. Adaptive Dose-Response Methods for Late-Stage Exploratory Development
(What can be adapted and how can information gathered during the
trial be used to drive the adaptations, Hypothesis testing approach,
Model-based approach, Logistical and operational issues associated
with the implementation of adaptive dose-response designs).
6. Simulations to illustrate the performance and implementation
of adaptive dose-response designs and their comparison to traditional
methods.
7. Summary and conclusions.
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