Implementing the EffTox dose-finding design in the Matchpoint trial

Brock, K., Billingham, L., Copland, M. , Siddique, S., Sirovica, M. and Yap, C. (2017) Implementing the EffTox dose-finding design in the Matchpoint trial. BMC Medical Research Methodology, 17, 112. (doi: 10.1186/s12874-017-0381-x) (PMID:28728594) (PMCID:PMC5520236)

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Background: The Matchpoint trial aims to identify the optimal dose of ponatinib to give with conventional chemotherapy consisting of fludarabine, cytarabine and idarubicin to chronic myeloid leukaemia patients in blastic transformation phase. The dose should be both tolerable and efficacious. This paper describes our experience implementing EffTox in the Matchpoint trial. Methods: EffTox is a Bayesian adaptive dose-finding trial design that jointly scrutinises binary efficacy and toxicity outcomes. We describe a nomenclature for succinctly describing outcomes in phase I/II dose-finding trials. We use dose-transition pathways, where doses are calculated for each feasible set of outcomes in future cohorts. We introduce the phenomenon of dose ambivalence, where EffTox can recommend different doses after observing the same outcomes. We also describe our experiences with outcome ambiguity, where the categorical evaluation of some primary outcomes is temporarily delayed. Results: We arrived at an EffTox parameterisation that is simulated to perform well over a range of scenarios. In scenarios where dose ambivalence manifested, we were guided by the dose-transition pathways. This technique facilitates planning, and also helped us overcome short-term outcome ambiguity. Conclusions: EffTox is an efficient and powerful design, but not without its challenges. Joint phase I/II clinical trial designs will likely become increasingly important in coming years as we further investigate non-cytotoxic treatments and streamline the drug approval process. We hope this account of the problems we faced and the solutions we used will help others implement this dose-finding clinical trial design. Trial registration: Matchpoint was added to the European Clinical Trials Database (2012-005629-65) on 2013-12-30.

Item Type:Articles
Keywords:CML, dose-finding, EffTox, efficacy, phase I/II, toxicity.
Glasgow Author(s) Enlighten ID:Copland, Professor Mhairi
Authors: Brock, K., Billingham, L., Copland, M., Siddique, S., Sirovica, M., and Yap, C.
College/School:College of Medical Veterinary and Life Sciences > School of Cancer Sciences
Journal Name:BMC Medical Research Methodology
Publisher:BioMed Central
ISSN (Online):1471-2288
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in BMC Medical Research Methodology 17: 112
Publisher Policy:Reproduced under a Creative Commons license

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