LAUSR

This paper presents an exhaustive empirical study to identify biomarkers using two approaches: frequency-based and network-based, over 17 different biclustering algorithms and six different cancer expression datasets. To systematically analyze the biclustering algorithms, we perform enrichment analysis, subtype identification, and biomarker identification. Biclustering algorithms such as C&C, SAMBA, and Plaid are useful to detect biomarkers by both approaches for all datasets except prostate cancer. We detect a total of 103 gene biomarkers using frequency-based method out of which 19 are for blood cancer, 36 for lung cancer, 25 for colon cancer, 13 for multi-tissue cancer, and 10 for prostate cancer. Using the network-based approach, we detect a total of 41 gene biomarkers of which 15 are from blood cancer, 12 from lung cancer, 6 from colon cancer, 7 from multi-tissue cancer, and 1 from prostate cancer dataset. We further extend our network analysis over some biclusters and detect some gene biomarkers not detected earlier by both frequency-based or network-based approach. We expand our work on breast cancer miRNA expression data to evaluate the performance of the biclustering algorithms. We detect 19 breast cancer biomarkers by frequency-based method and 5 by network-based method for the miRNA dataset.