The Sate of Liquid Biopsy
Author:Pam Harrison Date: March 5, 2018 Source: Medscape.com So called "liquid biopsies" — which can detect circulating tumor DNA (ctDNA) in blood samples — are not yet ready for prime time in the diagnosis or management of early-stage or advanced solid tumors, a new expert review concludes. These assays are also not useful, outside of clinical trials, for monitoring patients for minimal residual disease following definitive treatment of cancer, nor for cancer screening, the expert review concludes. The review was prepared jointly by the American Society of Clinical Oncology (ASCO) and the College of American Pathologists (CAP) and was published online March 5 in the Journal of Clinical Oncology. "This is an area of great interest to both pathologists and oncologists, [and] it's also an area where we see a lot of commercial advertisement and a lot of enthusiasm from the public," Jason Merker, MD, PhD, cochair of the expert panel, who was representing the CAP, said in a statement. "We thought it was a good time to look at the literature and take an evidence-based approach to various uses for ctDNA assays," he added. "Like all new things in medicine, the use of ctDNA assays in routine cancer care requires evidence of clinical utility. At present, there is insufficient evidence of clinical validity and utility for the majority of ctDNA assays in advanced cancer, including those that interrogate a panel of genes," said Daniel F. Hayes, MD, coauthor of the review, who was representing ASCO. "What is promising is that this area [...]