title: MicroRNAs in plasma of pancreatic ductal adenocarcinoma patients as novel blood-based biomarkers of disease.
abstract: Development of minimally invasive biomarker assays for early detection and effective clinical management of pancreatic cancer is urgently needed to reduce high morbidity and mortality associated with this malignancy. We hypothesized that if aberrantly expressing microRNAs (miRNA) in pancreatic adenocarcinoma tissues are detected in blood plasma, then plasma profiling of these miRNAs might serve as a minimally invasive early detection biomarker assay for this malignancy. By using a modified protocol to isolate and quantify plasma miRNAs from heparin-treated blood, we show that miRNA profiling in plasma can differentiate pancreatic adenocarcinoma patients from healthy controls. We have profiled four miRNAs, miR-21, miR-210, miR-155, and miR-196a, all implicated in the development of pancreatic cancer with either proven or predicted target genes involved in critical cancer-associated cellular pathways. Of these, miR-155 has recently been identified as a candidate biomarker of early pancreatic neoplasia, whereas elevated expression of miR196a has been shown to parallel progression of disease. The results revealed a sensitivity of 64% and a specificity of 89% with the analyses of plasma levels for this panel of four miRNAs. The area under the receiver operating characteristic curve were estimated at 0.82 and 0.78 without and with leave-one-out cross-validation scheme, respectively. These observations, although a "proof of principle" finding at this time, show the feasibility of developing plasma miRNA profiling as a sensitive and specific blood-based biomarker assay for pancreatic cancer that has the potential of translation to the clinic with additional improvements in the future.
authors.affiliation: Department of Molecular Pathology, The University of Texas M.D. Anderson Cancer Canter, Houston, Texas, 77054, USA.
authors.forename: Jin
authors.initials: J
authors.lastname: Wang
authors.forename: Jinyun
authors.initials: J
authors.lastname: Chen
authors.forename: Ping
authors.initials: P
authors.lastname: Chang
authors.forename: Aimee
authors.initials: A
authors.lastname: LeBlanc
authors.forename: Donghui
authors.initials: D
authors.lastname: Li
authors.forename: James L
authors.initials: JL
authors.lastname: Abbruzzesse
authors.forename: Marsha L
authors.initials: ML
authors.lastname: Frazier
authors.forename: Ann M
authors.initials: AM
authors.lastname: Killary
authors.forename: Subrata
authors.initials: S
authors.lastname: Sen
mesh_terms: D000230:Adenocarcinoma / Q000097:blood* / Q000473:pathology; D000368:Aged; D014408:Biomarkers, Tumor / Q000097:blood* / Q000235:genetics; D021441:Carcinoma, Pancreatic Ductal / Q000097:blood* / Q000556:secondary; D018450:Disease Progression; D005240:Feasibility Studies; D005260:Female; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008297:Male; D035683:MicroRNAs / Q000097:blood*; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000097:blood* / Q000473:pathology; D011379:Prognosis; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012372:ROC Curve; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012680:Sensitivity and Specificity
chemical_list: D014408:Biomarkers, Tumor; C524942:MIRN155 microRNA, human; C542543:MIRN196 microRNA, human; C524940:MIRN21 microRNA, human; C543800:MIRN210 microRNA, human; D035683:MicroRNAs; D012333:RNA, Messenger