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Journal of Biomedicine and Biotechnology
Volume 2009 (2009), Article ID 608701, 10 pages
Research Article

Gene-Based Multiclass Cancer Diagnosis with Class-Selective Rejections

Institut Charles Delaunay (ICD, FRE CNRS 2848), Université de Technologie de Troyes, LM2S 12 rue Marie Curie, BP 2060, 10010 Troyes cedex, France

Received 15 January 2009; Accepted 13 March 2009

Academic Editor: Dechang Chen

Copyright © 2009 Nisrine Jrad et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Supervised learning of microarray data is receiving much attention in recent years. Multiclass cancer diagnosis, based on selected gene profiles, are used as adjunct of clinical diagnosis. However, supervised diagnosis may hinder patient care, add expense or confound a result. To avoid this misleading, a multiclass cancer diagnosis with class-selective rejection is proposed. It rejects some patients from one, some, or all classes in order to ensure a higher reliability while reducing time and expense costs. Moreover, this classifier takes into account asymmetric penalties dependant on each class and on each wrong or partially correct decision. It is based on --SVM coupled with its regularization path and minimizes a general loss function defined in the class-selective rejection scheme. The state of art multiclass algorithms can be considered as a particular case of the proposed algorithm where the number of decisions is given by the classes and the loss function is defined by the Bayesian risk. Two experiments are carried out in the Bayesian and the class selective rejection frameworks. Five genes selected datasets are used to assess the performance of the proposed method. Results are discussed and accuracies are compared with those computed by the Naive Bayes, Nearest Neighbor, Linear Perceptron, Multilayer Perceptron, and Support Vector Machines classifiers.