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Bioinformatics 2007 23(9):1106-1114; doi:10.1093/bioinformatics/btm036
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

MSVM-RFE: extensions of SVM-RFE for multiclass gene selection on DNA microarray data

Xin Zhou and David P. Tuck *

Department of Pathology, Yale University School of Medicine, New Haven, Connecticut 06510, USA

*To whom correspondence should be addressed.


  Abstract

Motivation: Given the thousands of genes and the small number of samples, gene selection has emerged as an important research problem in microarray data analysis. Support Vector Machine—Recursive Feature Elimination (SVM-RFE) is one of a group of recently described algorithms which represent the stat-of-the-art for gene selection. Just like SVM itself, SVM-RFE was originally designed to solve binary gene selection problems. Several groups have extended SVM-RFE to solve multiclass problems using one-versus-all techniques. However, the genes selected from one binary gene selection problem may reduce the classification performance in other binary problems.

Results: In the present study, we propose a family of four extensions to SVM-RFE (called MSVM-RFE) to solve the multiclass gene selection problem, based on different frameworks of multiclass SVMs. By simultaneously considering all classes during the gene selection stages, our proposed extensions identify genes leading to more accurate classification.

Contact: david.tuck{at}yale.edu

Supplementary information: Supplementary materials, including a detailed review of both binary and multiclass SVMs, and complete experimental results, are available at Bioinformatics online.

Associate Editor: David Rocke

Received on December 7, 2006; revised on January 24, 2007; accepted on January 26, 2007

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