Two-step hypothesis testing to detect gene-environment interactions in a genome-wide scan with a survival endpoint.

Abstract

Defined by their genetic profile, individuals may exhibit differential clinical outcomes due to an environmental exposure. Identifying subgroups based on specific exposure-modifying genes can lead to targeted interventions and focused studies. Genome-wide interaction scans (GWIS) can be performed to identify such genes, but these scans typically suffer from low power due to the large multiple testing burden. We provide a novel framework for powerful two-step hypothesis tests for GWIS with a time-to-event endpoint under the Cox proportional hazards model. In the Cox regression setting, we develop an approach that prioritizes genes for Step-2 G×E testing based on a carefully constructed Step-1 screening procedure. Simulation results demonstrate this two-step approach can lead to substantially higher power for identifying gene-environment ( G×E ) interactions compared to the standard GWIS while preserving the family wise error rate over a range of scenarios. In a taxane-anthracycline chemotherapy study for breast cancer patients, the two-step approach identifies several gene expression by treatment interactions that would not be detected using the standard GWIS.

• Authors: Eric S Kawaguchi, Gang Li, Juan Pablo Lewinger, W James Gauderman
• Journal: Statistics in medicine (Stat Med) Vol. 41 Issue 9 Pg. 1644-1657 (04 30 2022) ISSN: 1097-0258 [Electronic] England
• PMID: 35075649 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)
• Copyright: © 2022 John Wiley & Sons Ltd.

Topics

• Computer Simulation
• Gene-Environment Interaction
• Genome-Wide Association Study (methods)
• Humans
• Models, Genetic
• Polymorphism, Single Nucleotide