USF-LVHN SELECT

Molecular counting enables accurate and precise quantification of methylated ctDNA for tumor-naive cancer therapy response monitoring.

Publication/Presentation Date

2-18-2025

Abstract

Personalized cancer treatment can significantly extend survival and improve quality of life for many patients, but accurate and real-time therapy response monitoring remains challenging. To overcome logistical and technical challenges associated with therapy response monitoring via imaging scans or assays that track the variant allele fraction (VAF) of somatic mutations in circulating tumor DNA (ctDNA), we developed a tumor-naive liquid biopsy assay that leverages Quantitative Counting Template (QCT) technology to accurately and precisely quantify methylated ctDNA (Northstar Response™). The assay achieves <  10% coefficient of variation at 1% tumor fraction, which is 2 × lower than tumor-naive, targeted-panel approaches using VAF. The assay accurately distinguishes 0.25% absolute changes in contrived tumor fraction (AUC > 0.94) and performs well in 12 solid tumor types. Finally, in a small cohort of patients with lung, colorectal, or pancreatic cancer, the assay detected changes in ctDNA methylation that correlate with clinical outcomes. With its precise quantification of ctDNA methylation, Northstar Response is a novel tool for therapy response monitoring with the potential to inform clinical decision making for cancer treatment.

Volume

15

Issue

1

First Page

5869

Last Page

5869

ISSN

2045-2322

Disciplines

Medical Education | Medicine and Health Sciences

PubMedID

39966612

Department(s)

USF-LVHN SELECT Program, USF-LVHN SELECT Program Students

Document Type

Article

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