title: High expression of RAB27A and TP53 in pancreatic cancer predicts poor survival.
abstract: RAB27A is a member of Rab family GTPases involved in cellular vesicle trafficking, and TP53 has recently been implicated in regulating the exosome secretion pathway. Because exosome secretion plays an important role in modulating tumor microenvironment and invasive growth, we hypothesized that RAB27A and TP53 expression might be associated with aggressive behavior in pancreatic ductal adenocarcinoma (PDAC), one of the most deadly human malignancies. We determined protein expression of RAB27A and TP53 in 265 pancreatic tissues (186 carcinomas and 79 normal or benign tissues) by immunohistochemistry analysis on tissue microarray and found their expression was correlated with patients' clinical parameters and overall survival. We found that RAB27A and TP53 protein expression was significantly higher in cancerous tissues compared to normal and benign tissues. High RAB27A protein expression (RAB27A+) was significantly associated with tumor stage and vascular invasion. No correlation between RAB27A and TP53 expression was observed. Patients with high RAB27A expression and high TP53 expression had a poor overall survival. Our data indicate that RAB27A expression is an independent prognostic marker for PDAC, and RAB27A-regulated exosome secretion pathway may represent a novel therapeutic target in pancreatic cancer .
authors.affiliation: Department of General Surgery, Nantong University Affiliated Hospital, Nantong, 226001, Jiangsu, China.
authors.forename: Qingqing
authors.initials: Q
authors.lastname: Wang
authors.forename: Qichao
authors.initials: Q
authors.lastname: Ni
authors.forename: Xudong
authors.initials: X
authors.lastname: Wang
authors.forename: Huijun
authors.initials: H
authors.lastname: Zhu
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Wang
authors.forename: Jianfei
authors.initials: J
authors.lastname: Huang
mesh_terms: D014408:Biomarkers, Tumor / Q000032:analysis*; D021441:Carcinoma, Pancreatic Ductal / Q000378:metabolism / Q000401:mortality / Q000473:pathology*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000378:metabolism / Q000401:mortality / Q000473:pathology*; D011379:Prognosis; D016016:Proportional Hazards Models; D046888:Tissue Array Analysis; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis*; D020691:rab GTP-Binding Proteins / Q000096:biosynthesis*; D000075745:rab27 GTP-Binding Proteins
chemical_list: D014408:Biomarkers, Tumor; C495901:TP53 protein, human; D016159:Tumor Suppressor Protein p53; D000075745:rab27 GTP-Binding Proteins; C066694:RAB27A protein, human; D020691:rab GTP-Binding Proteins