Oncotarget

Research Papers:

CRM1/XPO1 expression in pancreatic adenocarcinoma correlates with survivin expression and the proliferative activity

David M. Saulino, Pamela S. Younes, Jennifer M. Bailey and Mamoun Younes _

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Oncotarget. 2018; 9:21289-21295. https://doi.org/10.18632/oncotarget.25088

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Abstract

David M. Saulino1, Pamela S. Younes1, Jennifer M. Bailey2 and Mamoun Younes1

1Department of Pathology and Laboratory Medicine, University of Texas Health Science Center at Houston McGovern Medical School, Houston, TX, USA

2Department of Medicine, Section of Gastroenterology, Hepatology and Nutrition, University of Texas Health Science Center at Houston McGovern Medical School, Houston, TX, USA

Correspondence to:

Mamoun Younes, email: mamoun.younes@uth.tmc.edu

Keywords: XPO1; CRM1; biomarkers; pancreas; nuclear export

Received: February 05, 2018    Accepted: March 21, 2018    Published: April 20, 2018

ABSTRACT

CRM1/XPO1 (CRM1) is a nuclear export chaperone that mediates the export of proteins essential to growth regulation and tumor suppression. Its overexpression in tumors was found to be associated with poor prognosis. Selective inhibitors of nuclear export are in phase I and II clinical trials for several tumor types. Our aim was to investigate CRM1 expression in pancreatic adenocarcinoma (PAC) and its relationship to survivin expression and the proliferative activity. Sections of tissue microarray containing 76 formalin fixed and paraffin embedded PAC were stained by immunohistochemistry (IHC) for CRM1, survivin, and Cyclin A. Expression levels of CRM1 and survivin and the proliferative activity, the S-phase fraction (SPF) in tumor cells, were determined using a quantitative digital image analysis solution (OTMIAS). Sixty-six of the 76 (86%) PAC showed positive staining for CRM1, and 10 (14%) were completely negative. The mean CRM1 expression levels ranged from 0.3 to 53 units and the median from 0.3 to 45 units. There was significant positive correlation between the mean and median expression levels of CRM1 in tumor cells and the mean and median levels of survivin (p<0.001). Moreover, there was positive correlation between the mean and median CRM1 levels in tumor cells and the SPF (p=0.013). Our results show that CRM1 is expressed in a significant proportion of PAC, and increased CRM1 levels correlates with increased survivin levels and increased proliferative activity.


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