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However, for a cancer, such disease signatures identified from different studies have little overlap.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Here, we propose a systemic approach to evaluate the reproducibility of disease signatures at multiple levels, on the basis of some statistically testable biological models. Using two datasets for breast cancer metastasis, we showed that different signature hubs identified from different studies were highly consistent in terms of significantly sharing interaction neighbours and displaying consistent co-expression changes with their overlapping neighbours, whereas the shared interaction neighbours were significantly over-represented with known cancer genes and enriched in pathways deregulated in breast cancer pathogenesis. Then, we showed that the signature hubs identified from the two datasets were highly reproducible at the protein interaction and pathway levels in three other independent datasets.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Our results provide a possible biological model that different signature hubs altered in different patient cohorts could disturb the same pathways associated with cancer metastasis through their interaction neighbours.<\/jats:p><\/jats:sec>","DOI":"10.1186\/1752-0509-4-151","type":"journal-article","created":{"date-parts":[[2010,11,9]],"date-time":"2010-11-09T07:16:48Z","timestamp":1289287008000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Multi-level reproducibility of signature hubs in human interactome for breast cancer metastasis"],"prefix":"10.1186","volume":"4","author":[{"given":"Chen","family":"Yao","sequence":"first","affiliation":[]},{"given":"Hongdong","family":"Li","sequence":"additional","affiliation":[]},{"given":"Chenggui","family":"Zhou","sequence":"additional","affiliation":[]},{"given":"Lin","family":"Zhang","sequence":"additional","affiliation":[]},{"given":"Jinfeng","family":"Zou","sequence":"additional","affiliation":[]},{"given":"Zheng","family":"Guo","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2010,11,9]]},"reference":[{"key":"562_CR1","doi-asserted-by":"publisher","first-page":"8418","DOI":"10.1073\/pnas.0932692100","volume":"100","author":"T Sorlie","year":"2003","unstructured":"Sorlie T, Tibshirani R, Parker J, Hastie T, Marron JS, Nobel A, Deng S, Johnsen H, Pesich R, Geisler S, et al.: Repeated observation of breast tumor subtypes in independent gene expression data sets. 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