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Traditional computational methods that detect genes differentially expressed between cancer and normal samples fail to work due to small sample size and independent assumption among genes. On the other hand, genes work in concert to perform their functions. Therefore, it is expected that dysregulated pathways will serve as better biomarkers compared with single genes.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>In this paper, we propose a novel approach to identify dysregulated pathways in cancer based on a pathway interaction network. Our contribution is three-fold. Firstly, we present a new method to construct pathway interaction network based on gene expression, protein-protein interactions and cellular pathways. Secondly, the identification of dysregulated pathways in cancer is treated as a feature selection problem, which is biologically reasonable and easy to interpret. Thirdly, the dysregulated pathways are identified as subnetworks from the pathway interaction networks, where the subnetworks characterize very well the functional dependency or crosstalk between pathways. The benchmarking results on several distinct cancer datasets demonstrate that our method can obtain more reliable and accurate results compared with existing state of the art methods. Further functional analysis and independent literature evidence also confirm that our identified potential pathogenic pathways are biologically reasonable, indicating the effectiveness of our method.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>Dysregulated pathways can serve as better biomarkers compared with single genes. In this work, by utilizing pathway interaction networks and gene expression data, we propose a novel approach that effectively identifies dysregulated pathways, which can not only be used as biomarkers to diagnose cancers but also serve as potential drug targets in the future.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1471-2105-13-126","type":"journal-article","created":{"date-parts":[[2012,6,15]],"date-time":"2012-06-15T11:20:20Z","timestamp":1339759220000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":103,"title":["Identifying dysregulated pathways in cancers from pathway interaction networks"],"prefix":"10.1186","volume":"13","author":[{"given":"Ke-Qin","family":"Liu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhi-Ping","family":"Liu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jin-Kao","family":"Hao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luonan","family":"Chen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xing-Ming","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2012,6,7]]},"reference":[{"key":"5364_CR1","doi-asserted-by":"publisher","DOI":"10.1002\/9780470488065","volume-title":"Biomolecular Networks: Methods and Applications in Systems Biology","author":"L Chen","year":"2009","unstructured":"Chen L, Wang R-S, Zhang X-S: Biomolecular Networks: Methods and Applications in Systems Biology. 2009, John Wiley & Sons Inc, Hoboken, New Jersey"},{"key":"5364_CR2","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-84996-214-8","volume-title":"Modelling Biomolecular Networks in Cells: Structures and Dynamics","author":"L Chen","year":"2010","unstructured":"Chen L, Wang R, Li C, Aihara K: Modelling Biomolecular Networks in Cells: Structures and Dynamics. 2010, Springer-Verlag, London"},{"issue":"5439","key":"5364_CR3","doi-asserted-by":"publisher","first-page":"531","DOI":"10.1126\/science.286.5439.531","volume":"286","author":"TR Golub","year":"1999","unstructured":"Golub TR, Slonim DK, Tamayo P, Huard C, Gaasenbeek M, Mesirov JP, Coller H, Loh ML, Downing JR, Caligiuri MA: Molecular classification of cancer: class discovery and class prediction by gene expression monitoring. 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