Journal
BIOMETRICS
Volume 59, Issue 3, Pages 542-554Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1111/1541-0420.00064
Keywords
ANCOVA; Bayesian inference; censored data; DNA microarray; endometrial cancer; gene expression; hierarchical priors; HPD intervals
Funding
- NCI NIH HHS [CA90301, CA74015, CA70101] Funding Source: Medline
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In DNA microarray analysis, there is often interest in isolating a few genes that best discriminate between tissue types. This is especially important in cancer, where different clinicopathologic groups are known to vary in their outcomes and response to therapy. The identification of a small subset of gene expression patterns distinctive for tumor subtypes can help design treatment strategies and improve diagnosis. Toward this goal, we propose a methodology for the analysis of high-density oligonucleotide arrays. The gene expression measures are modeled as censored data to account for the quantification limits of the technology, and two gene selection criteria based on contrasts from an analysis of covariance (ANCOVA) model are presented. The model is formulated in a hierarchical Bayesian framework, which in addition to making the fit of the model straightforward and computationally efficient, allows us to borrow strength across genes. The elicitation of hierarchical priors, as well as issues related to parameter identifiability and posterior propriety, are discussed in detail. We examine the performance of our proposed method on simulated data, then present a detailed case study of an endometrial cancer dataset.
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