Actinin-4 splice variant - a complementary diagnostic and prognostic marker of pancreatic neuroendocrine neoplasms

Journal of Cancer
Xiaojun XuKlaus Felix

Abstract

Introduction: For pathological diagnosis of pancreatic neuroendocrine neoplasms (pNENs) the routinely used immunohistochemical markers are chromogranin A (CgA) and synaptophysin (Syn). Their ability as prognostic markers is not well established. A splice variant of actinin-4 (Actn-4sv) was recently found to be an excellent biomarker of neuroendocrine neoplasms of the lung. We aimed to investigate the expression of Actn-4sv in pNENs and evaluate its quality as a biomarker of pNENs. Methods: Paraffin-embedded and frozen tissues specimens from 122 pNENs were analyzed. Western blots were performed to prove and compare the relative amount of Actn-4sv expression in pNENs tissue homogenates. For comparison pancreatic ductal adenocarcinoma (PDAC) and normal pancreatic tissues were analyzed in parallel. Immunohistochemistry (IHC) of paraffin sections of pNENs for Actn-4sv were performed and compared to the classic neuroendocrine markers CgA and Syn. Correlations were calculated between the staining intensity and distribution of Actn-4sv and staging, grading and afflicted lymph nodes respectively. Results: Actn-4sv was expressed in 88.5% (108/122) of pNENs, but not in normal pancreatic tissues (0/14) or PDAC (0/14). Compared to CgA and S...Continue Reading

Methods Mentioned

BETA
electrophoresis
RNAseq

Software Mentioned

R package ' ggplot2 '
Picard
pNEN
SAS
BEDtools
ImageJ
GraphPad Prism

Related Concepts

Related Feeds

Adenoma, Islet Cell

Islet Cell Adenoma arises in the islet cells, which are insulin producing cells of the pancreas. These tumors can be either malignant or benign. Discover the latest research on Islet Cell Adenoma here.

Carcinoma, Islet Cell

Islet Cell Carcinoma or Pancreatic Neuroendocrine Tumours arises in the hormone producing cells of the pancreas. These tumors can be either malignant or benign. Discover the latest research on Islet Cell Carcinoma here.

Carcinoma, Islet Cell (Keystone)

Islet Cell Carcinoma or Pancreatic Neuroendocrine Tumours arise in the hormone producing cells of the pancreas. These tumors can be either malignant or benign. Discover the latest research on islet cell carcinoma in this feed.