1. Co-expression analysis of pancreatic cancer proteome reveals biology and prognostic biomarkers.
- Author
-
Mantini, G., Vallés, A. M., Le Large, T. Y. S., Capula, M., Funel, N., Pham, T. V., Piersma, S. R., Kazemier, G., Bijlsma, M. F., Giovannetti, E., and Jimenez, C. R.
- Subjects
BIOMARKERS ,PANCREATIC cancer ,EPITHELIAL-mesenchymal transition ,BIOLOGY ,PROGNOSIS ,GENES ,HISTOCHEMISTRY ,SYSTEMS biology - Abstract
Purpose: Despite extensive biological and clinical studies, including comprehensive genomic and transcriptomic profiling efforts, pancreatic ductal adenocarcinoma (PDAC) remains a devastating disease, with a poor survival and limited therapeutic options. The goal of this study was to assess co-expressed PDAC proteins and their associations with biological pathways and clinical parameters. Methods: Correlation network analysis is emerging as a powerful approach to infer tumor biology from omics data and to prioritize candidate genes as biomarkers or drug targets. In this study, we applied a weighted gene co-expression network analysis (WGCNA) to the proteome of 20 surgically resected PDAC specimens (PXD015744) and confirmed its clinical value in 82 independent primary cases. Results: Using WGCNA, we obtained twelve co-expressed clusters with a distinct biology. Notably, we found that one module enriched for metabolic processes and epithelial-mesenchymal-transition (EMT) was significantly associated with overall survival (p = 0.01) and disease-free survival (p = 0.03). The prognostic value of three proteins (SPTBN1, KHSRP and PYGL) belonging to this module was confirmed using immunohistochemistry in a cohort of 82 independent resected patients. Risk score evaluation of the prognostic signature confirmed its association with overall survival in multivariate analyses. Finally, immunofluorescence analysis confirmed co-expression of SPTBN1 and KHSRP in Hs766t PDAC cells. Conclusions: Our WGCNA analysis revealed a PDAC module enriched for metabolic and EMT-associated processes. In addition, we found that three of the proteins involved were associated with PDAC survival. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF