Liquid Biopsy Assay for the Early Detection of Pancreatic Cancer

By LabMedica International staff writers
Posted on 29 Apr 2020

A liquid biopsy assay for multiple biomarkers enables early detection of pancreatic cancer before it metastasizes and while there are still treatment options available.

The assay, developed by investigators at the University of Pennsylvania School of Medicine (Philadelphia, USA), was designed to detect pancreatic cancer (pancreatic ductal adenocarcinoma or PDAC) while still in its earliest stages.

Image: This liquid biopsy blood test detects pancreatic cancer early before it metastasizes (Photo courtesy of University of Pennsylvania School of Medicine).

Initially, the investigators analyzed plasma samples from 204 subjects (71 healthy, 44 non-PDAC pancreatic disease, and 89 with PDAC) for the following biomarkers: carbohydrate antigen 19-9 (CA19-9), KRAS mutational burden, tumor-associated extra-cellular vesicle (EV) miRNA, and mRNA isolated on a nanomagnetic platform developed by the investigators. Circulating cell-free DNA (ccfDNA) concentration was measured by qPCR, ccfDNA KRASG12D/V/R mutations were detected by droplet digital PCR, and CA19-9 was measured by ECLIA (enhanced chemiluminescence immunoassay).

Results revealed that in a test group of 47 patients (20 with PDAC, 27 controls), the assay was 92% accurate in its ability to detect PDAC, which was better than measuring the best known PDAC biomarker, CA19-9, alone (89%). In addition, the assay was 84% accurate in determining disease staging in samples from the 25 PDAC patients who imaging showed did not have metastatic disease. This result was significantly better than that obtained by imaging alone (64% accurate).

"Right now, the majority of patients who are diagnosed already have metastatic disease, so there is a critical need for a test that can not only detect the disease earlier but also accurately tell us who might be at a point where we can direct them to a potentially curative treatment," said co-senior author Dr. Erica L. Carpenter, assistant professor of medicine at the University of Pennsylvania School of Medicine. "If validated, this test could not only provide a key tool for at-risk patients, but also a monitoring tool for patients with certain known risk factors like BRCA mutations."

The liquid biopsy assay for detection of pancreatic cancer was described in the April 16, 2020, online edition of the journal Clinical Cancer Research.

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University of Pennsylvania School of Medicine