Skip to content

Loading Events

« All Events

  • This event has passed.

Webinar: Biostatistics and Bioinformatics Seminar – ‘Mediation analysis for survival data with high-dimensional mediators’

September 29, 12:00 pm to 1:00 pm

Presented by: Lei Liu, PhD, Professor, Division of Biostatistics at Washington University in St. Louis.

About the presentation: Mediation analysis has become a prevalent method to identify causal pathway(s) between an independent variable and a dependent variable through intermediate variable(s). However, little work has been done when the intermediate variables (mediators) are high-dimensional and the outcome is a survival endpoint. In this paper, we introduce a novel method to identify potential mediators in a causal framework of high-dimensional Cox regression. We first reduce the data dimension through a mediation-based sure independence screening method. A debiased Lasso inference procedure is used for Cox’s regression parameters. We adopt a multiple-testing procedure to accurately control the false discovery rate when testing high-dimensional mediation hypotheses. Simulation studies are conducted to demonstrate the performance of our method. We apply this approach to explore the mediation mechanisms of 379 330 DNA methylation markers between smoking and overall survival among lung cancer patients in The Cancer Genome Atlas lung cancer cohort. Two methylation sites (cg08108679 and cg26478297) are identified as potential mediating epigenetic markers.

To join via Zoom, visit

­­­­­­­­­­­­­­­­­­­­To join via phone, dial:  929-205-6099

Meeting ID:  967 8647 5339

Passcode:  013520



September 29
12:00 pm to 1:00 pm
Event Category:


Department of Public Health Sciences
View Organizer Website

Add events

Anyone affiliated with Penn State Health and Penn State College of Medicine can request access to add events to this calendar here.

Infonet calendar

Faculty, staff and students with Penn State Health network access can view selected internal events on the Infonet calendar here.