Power and sample size calculations for SNP association studies with censored time-to-event outcomes.

Journal Article (Journal Article)

For many clinical studies in cancer, germline DNA is prospectively collected for the purpose of discovering or validating single-nucleotide polymorphisms (SNPs) associated with clinical outcomes. The primary clinical endpoint for many of these studies are time-to-event outcomes such as time of death or disease progression which are subject to censoring mechanisms. The Cox score test can be readily employed to test the association between a SNP and the outcome of interest. In addition to the effect and sample size, and censoring distribution, the power of the test will depend on the underlying genetic risk model and the distribution of the risk allele. We propose a rigorous account for power and sample size calculations under a variety of genetic risk models without resorting to the commonly used contiguous alternative assumption. Practical advice along with an open-source software package to design SNP association studies with survival outcomes are provided.

Full Text

Duke Authors

Cited Authors

  • Owzar, K; Li, Z; Cox, N; Jung, S-H

Published Date

  • September 2012

Published In

Volume / Issue

  • 36 / 6

Start / End Page

  • 538 - 548

PubMed ID

  • 22685040

Pubmed Central ID

  • PMC3592339

Electronic International Standard Serial Number (EISSN)

  • 1098-2272

Digital Object Identifier (DOI)

  • 10.1002/gepi.21645


  • eng

Conference Location

  • United States