Artificial Life and Robotics

, Volume 15, Issue 1, pp 21–24

Particle swarm optimization with a modified sigmoid function for gene selection from gene expression data

Original Article

DOI: 10.1007/s10015-010-0757-z

Cite this article as:
Mohamad, M.S., Omatu, S., Deris, S. et al. Artif Life Robotics (2010) 15: 21. doi:10.1007/s10015-010-0757-z


In order to select a small subset of informative genes from gene expression data for cancer classification, many researchers have recently analyzed gene expression data using various computational intelligence methods. However, due to the small number of samples compared with the huge number of genes (high-dimension), irrelevant genes, and noisy genes, many of the computational methods face difficulties in selecting such a small subset. Therefore, we propose an enhancement of binary particle swarm optimization to select the small subset of informative genes that is relevant for classifying cancer samples more accurately. In this method, three approaches have been introduced to increase the probability of the bits in a particle’s position being zero. By performing experiments on two gene expression data sets, we have found that the performance of the proposed method is superior to previous related works, including the conventional version of binary particle swarm optimization (BPSO), in terms of classification accuracy and the number of selected genes. The proposed method also produces lower running times compared with BPSO.

Key words

Binary particle swarm optimization Gene selection Gene expression data Cancer classification 

Copyright information

© International Symposium on Artificial Life and Robotics (ISAROB). 2010

Authors and Affiliations

  1. 1.Department of Computer Science and Intelligent Systems, Graduate School of EngineeringOsaka Prefecture UniversitySakai, OsakaJapan
  2. 2.Department of Software Engineering, Faculty of Computer Science and Information SystemsUniversiti Teknologi MalaysiaJohoreMalaysia

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