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355 – Contributed Poster Presentations: Biopharmaceutical Section
Nonparametric Bayesian Method for Drug Combination With Discrete Doses
Galen Cook-Wiens
Cedars-Sinai Medical Center
Zahra S. Razaee
Cedars-Sinai Medical Center
Mourad Tighiouart
Cedars-Sinai Medical Center
We propose an adaptive design for early-phase drug-combination cancer trials with the goal of estimating the maximum tolerated dose (MTD). A nonparametric Bayesian model, using Beta priors truncated to the set of partially ordered dose combinations, is used to describe the probability of dose limiting toxicity (DLT). Dose allocation between successive cohorts of patients is estimated using a modified Continual Reassessment scheme. The updated probabilities of DLT are calculated with a Gibbs sampler that employs a weighting mechanism to calibrate the influence of data versus the prior. At the end of the trial, we recommend one or more dose combinations as the MTD based on our proposed algorithm. The design operating characteristics indicate that our method is comparable with existing methods.