Joint modeling tumor burden and time to event data in oncology trials |
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Authors: | Ye Shen Aparna Anderson Ritwik Sinha Yang Li |
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Affiliation: | 1. Department of Epidemiology and Biostatistics, College of Public Health, University of Georgia, , Athens, 30602 GA, USA;2. Global Biometric Sciences, Research & Development, Bristol‐Myers Squibb Company, , Wallingford, 06492 CT, USA;3. Adobe Research India Labs, Adobe, , Bengaluru, India;4. School of Statistics and Center for Applied Statistics, Renmin University of China, , Beijing, China |
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Abstract: | The tumor burden (TB) process is postulated to be the primary mechanism through which most anticancer treatments provide benefit. In phase II oncology trials, the biologic effects of a therapeutic agent are often analyzed using conventional endpoints for best response, such as objective response rate and progression‐free survival, both of which causes loss of information. On the other hand, graphical methods including spider plot and waterfall plot lack any statistical inference when there is more than one treatment arm. Therefore, longitudinal analysis of TB data is well recognized as a better approach for treatment evaluation. However, longitudinal TB process suffers from informative missingness because of progression or death. We propose to analyze the treatment effect on tumor growth kinetics using a joint modeling framework accounting for the informative missing mechanism. Our approach is illustrated by multisetting simulation studies and an application to a nonsmall‐cell lung cancer data set. The proposed analyses can be performed in early‐phase clinical trials to better characterize treatment effect and thereby inform decision‐making. Copyright © 2014 John Wiley & Sons, Ltd. |
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Keywords: | overall survival tumor burden process longitudinal data informative missing joint modeling |
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