9/18/2015

Post date: Sep 21, 2015 5:46:45 PM

Title: Semiparametric regression analysis for time-to-event marked endpoints in cancer studies

Speaker: Chen Hu, Assistant Professor, Division of Biostatistics and Bioinformatics, SKCCC, JHU

In cancer studies the disease natural history process is often observed only at a fixed, random point of diagnosis (a survival time), leading to a current status observation representing a surrogate (a mark) attached to the observed survival time. Examples include time to recurrence and stage (local vs. metastatic). We study a simple model that provides insights into the relationship between the observed marked endpoint and the latent disease natural history leading to it. A semiparametric regression model is developed to assess the covariate effects on the observed marked endpoint explained by a latent disease process. The proposed semiparametric regression model can be represented as a transformation model in terms of mark-specific hazards, induced by a process-based mixed effect. Large-sample properties of the proposed estimators are established. The methodology is illustrated by Monte Carlo simulation studies, and an application to a randomized clinical trial of adjuvant therapy for breast cancer.