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Updated: Aug 4, 2025

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CRM and partial order CRM with adaptive rescaling for dose-finding in immunotherapy trials with a continuous outcome
Pooja T Saha1, Jason P Fine1, Anastasia Ivanova1
1Department of Biostatistics, CB #7420, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Abstract:
In many phase 1 oncology trials of immunotherapies, no dose-limiting toxicities are observed and the maximum tolerated dose cannot be identified. In these settings, dose-finding can be guided by a biomarker of response rather than the occurrences of dose-limiting toxicity. The recommended phase 2 dose can be defined as the dose with mean response equal to a prespecified value of a continuous response biomarker. To target the mean of a continuous biomarker, we build on the idea of the continual reassessment method and the quasi-Bernoulli likelihood. We extend the design to a problem of finding the recommended phase 2 dose combination in a trial with multiple immunotherapies.
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