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2017 ; 12
(5
): e0177662
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Network based stratification of major cancers by integrating somatic mutation and
gene expression data
#MMPMID28520777
He Z
; Zhang J
; Yuan X
; Liu Z
; Liu B
; Tuo S
; Liu Y
PLoS One
2017[]; 12
(5
): e0177662
PMID28520777
show ga
The stratification of cancer into subtypes that are significantly associated with
clinical outcomes is beneficial for targeted prognosis and treatment. In this
study, we integrated somatic mutation and gene expression data to identify
clusters of patients. In contrast to previous studies, we constructed
cancer-type-specific significant co-expression networks (SCNs) rather than using
a fixed gene network across all cancers, such as the network-based stratification
(NBS) method, which ignores cancer heterogeneity. For each type of cancer, the
gene expression data were used to construct the SCN network, while the gene
somatic mutation data were mapped onto the network, propagated, and used for
further clustering. For the clustering, we adopted an improved
network-regularized non-negative matrix factorization (netNMF) (netNMF_HC) for a
more precise classification. We applied our method to various datasets, including
ovarian cancer (OV), lung adenocarcinoma (LUAD) and uterine corpus endometrial
carcinoma (UCEC) cohorts derived from the TCGA (The Cancer Genome Atlas) project.
Based on the results, we evaluated the performance of our method to identify
survival-relevant subtypes and further compared it to the NBS method, which
adopts priori networks and netNMF algorithm. The proposed algorithm outperformed
the NBS method in identifying informative cancer subtypes that were significantly
associated with clinical outcomes in most cancer types we studied. In particular,
our method identified survival-associated UCEC subtypes that were not identified
by the NBS method. Our analysis indicated valid subtyping of patient could be
applied by mutation data with cancer-type-specific SCNs and netNMF_HC for
individual cancers because of specific cancer co-expression patterns and more
precise clustering.