title: Risk-group-specific dose finding based on an average toxicity score.
abstract: We propose a Bayesian dose-finding design that accounts for two important factors, the severity of toxicity and heterogeneity in patients' susceptibility to toxicity. We consider toxicity outcomes with various levels of severity and define appropriate scores for these severity levels. We then use a multinomial-likelihood function and a Dirichlet prior to model the probabilities of these toxicity scores at each dose, and characterize the overall toxicity using an average toxicity score (ATS) parameter. To address the issue of heterogeneity in patients' susceptibility to toxicity, we categorize patients into different risk groups based on their susceptibility. A Bayesian isotonic transformation is applied to induce an order-restricted posterior inference on the ATS. We demonstrate the performance of the proposed dose-finding design using simulations based on a clinical trial in multiple myeloma.
authors: Department of Biostatistics, Division of Quantitative Sciences, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, Texas 77030, USA. bbekele@mdanderson.org
authors: B Nebiyou
authors: BN
authors: Bekele
authors: Yisheng
authors: Y
authors: Li
authors: Yuan
authors: Y
authors: Ji
mesh_terms: D000970:Antineoplastic Agents / Q000008:administration & dosage / Q000633:toxicity; D001499:Bayes Theorem; D003198:Computer Simulation; D004305:Dose-Response Relationship, Drug; D064420:Drug-Related Side Effects and Adverse Reactions; D006801:Humans; D009101:Multiple Myeloma / Q000150:complications / Q000188:drug therapy; D057285:Precision Medicine / Q000379:methods*; D011336:Probability; D018570:Risk Assessment; D012720:Severity of Illness Index
chemical_list: D000970:Antineoplastic Agents