Published online Aug 21, 2017. doi: 10.3748/wjg.v23.i31.5764
Peer-review started: April 8, 2017
First decision: April 26, 2017
Revised: May 11, 2017
Accepted: July 22, 2017
Article in press: July 24, 2017
Published online: August 21, 2017
Processing time: 140 Days and 22.4 Hours
To elucidate the effect of expression of doublecortin and CaM kinase-like-1 (DCLK1) in patients with pancreatic ductal adenocarcinoma (PDAC).
Tumor specimens were obtained from 136 patients with pancreatic cancer who had undergone resection without preoperative therapy between January 2000 and December 2013 at the Department of Surgical Oncology, Osaka City University. The resected specimens were analyzed for associations with clinicopathological data, including DCLK1 expression, epithelial mesenchymal transition (EMT) marker expression, and cancer stem cell (CSC) marker expression. Univariate and multivariate survival analyses were performed and we assessed the association between DCLK1 expression and clinicopathological factors, including the EMT marker and CSC marker.
In total, 48.5% (66/136) of the pancreatic cancer samples were positive for DCLK1. Patients with DCLK1-positive tumors had significantly shorter survival times than those with DCLK1-negative tumors (median, 18.7 mo vs 49.5 mo, respectively; P < 0.0001). Positive DCLK1 expression correlated with histological grade (P = 0.0290), preoperative CA19-9 level (P = 0.0060), epithelial cell adhesion molecule (EpCAM) expression (P = 0.0235), and the triple-positive expression of CD44/CD24/EpCAM (P = 0.0139). On univariate survival analysis, five factors were significantly associated with worse overall survival: histological grade of G2 to G4 (P = 0.0091), high preoperative serum SPan-1 level (P = 0.0034), R1/2 (P < 0.0001), positive expression of DCLK1 (P < 0.0001) or CD44 (P = 0.0245). On multivariate survival analysis, R1/2 [odds ratio (OR) = 2.019, 95% confidence interval (CI): 1.380-2.933; P = 0.0004] and positive DCLK1 expression (OR = 1.848, 95%CI: 1.2854-2.661; P = 0.0009) were independent prognostic factors.
DCLK1 expression was found to be an independent prognostic factor and it may play a crucial prognostic role by promoting acquisition of stemness.
Core tip: Doublecortin and CaM kinase-like-1 (DCLK1) is a microtubule - associated kinase and has recently attracted much attention as an important cancer stem cell marker. DCLK1 expression is correlated with aggressiveness in various cancers. However, there have been few investigations correlating DCLK1 expression with survival in pancreatic ductal adenocarcinoma (PDAC). PDAC patients with DCLK1-positive tumors had significantly shorter survival times than those with DCLK1-negative tumors. DCLK1 expression was an independent prognostic factor by multivariate survival analysis. Furthermore, DCLK1-positive expression was correlated to EpCAM expression and triple-positive expression of CD44/CD24/EpCAM. These findings suggest DCLK1 may have a crucial prognostic role in acquisition of stemness.