Background: Pancreatic ductal adenocarcinoma (PDAC) is associated with poor prognosis.
In this context, the identification of biomarkers regarding the PDAC diagnosis, monitoring, and prognosis
Objectives: The purpose of the current study was to investigate the differential gene expression profile
of the chloride intracellular channel (CLIC) gene family network in patients with PDAC, in order to
suggest novel biomarkers.
Methods: In silico techniques were used to construct the interactome of the CLIC gene family, identify
the differentially expressed genes (DEGs) in PDAC as compared to healthy controls, and evaluate
their potential prognostic role.
Results: Transcriptomic data of three microarray datasets were included, incorporating 114 tumor and
59 normal pancreatic samples. Twenty DEGs were identified; eight were up-regulated and twelve
were downregulated. A molecular signature of seven genes (Chloride Intracellular Channel 1 –
CLIC1; Chloride Intracellular Channel 3 – CLIC3; Chloride Intracellular Channel 4 – CLIC4; Ganglioside
Induced Differentiation Associated Protein 1 – GDAP1; Ganglioside Induced Differentiation
Associated Protein 1 Like 1 – GDAP1L1; Glutathione S-Transferase Pi 1 - GSTP1; Prostaglandin E
Synthase 2 – PTGES2) were identified as prognostic markers associated with overall survival. Positive
correlations were reported regarding the expression of CLIC1-CLIC3, CLIC4-CLIC5, and CLIC5-
CLIC6. Finally, gene set enrichment analysis demonstrated the molecular functions and miRNA families
(hsa-miR-122, hsa-miR-618, hsa-miR-425, and hsa-miR-518) relevant to the seven prognostic
Conclusion: These outcomes demonstrate a seven-gene molecular panel that predicts the patients’
prospective survival following pancreatic resection for PDAC.