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    Gene expression profiling identifies distinct molecular subgroups of leiomyosarcoma with clinical relevance

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    Publication date
    2016
    Author
    Lee, Stephanie
    Roe, T.
    Mangham, D.C.
    Fisher, C.
    Grimer, R.J.
    Judson, I.
    Keyword
    Leiomyosarcoma; Microarray; Gene expression; Molecular classification; Clustering; Soft tissue sarcoma
    Rights
    © 2016 Cancer Research UK. All rights reserved. This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
    Peer-Reviewed
    Yes
    
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    Abstract
    Background: Soft tissue sarcomas are heterogeneous and a major complication in their management is that the existing classification scheme is not definitive and is still evolving. Leiomyosarcomas, a major histologic category of soft tissue sarcomas, are malignant tumours displaying smooth muscle differentiation. Although defined as a single group, they exhibit a wide range of clinical behaviour. We aimed to carry out molecular classification to identify new molecular subgroups with clinical relevance. Methods: We used gene expression profiling on 20 extra-uterine leiomyosarcomas and cross-study analyses for molecular classification of leiomyosarcomas. Clinical significance of the subgroupings was investigated. Results: We have identified two distinct molecular subgroups of leiomyosarcomas. One group was characterised by high expression of 26 genes that included many genes from the sub-classification gene cluster proposed by Nielsen et al. These sub-classification genes include genes that have importance structurally, as well as in cell signalling. Notably, we found a statistically significant association of the subgroupings with tumour grade. Further refinement led to a group of 15 genes that could recapitulate the tumour subgroupings in our data set and in a second independent sarcoma set. Remarkably, cross-study analyses suggested that these molecular subgroups could be found in four independent data sets, providing strong support for their existence. Conclusions: Our study strongly supported the existence of distinct leiomyosarcoma molecular subgroups, which have clinical association with tumour grade. Our findings will aid in advancing the classification of leiomyosarcomas and lead to more individualised and better management of the disease.
    URI
    http://hdl.handle.net/10454/14821
    Version
    Published version
    Citation
    Lee Y-F, Roe T, Mangham DC et al (2016) Gene expression profiling identifies distinct molecular subgroups of leiomyosarcoma with clinical relevance. British Journal of Cancer. 115: 1000-1007.
    Link to publisher’s version
    http://dx.doi.org/10.1038/bjc.2016.280
    Type
    Article
    Collections
    Life Sciences Publications

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