Related Experiment Video
Updated: Jul 29, 2025
05:26
A Standardized Liquid Biopsy Preanalytical Protocol for Downstream Circulating-Free DNA Applications
Published on: September 16, 2022
4.0K
Evaluating Pre-Analytical Variables for Saliva Cell-Free DNA Liquid Biopsy
Blake Salfer1, Daisy Havo1, Skyllar Kuppinger1
1Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles (UCLA), Los Angeles, CA 90095, USA.
Diagnostics (Basel, Switzerland)
|May 27, 2023
Summary
Saliva liquid biopsies show promise for cancer detection. A study found a specific preservative stabilized cell-free DNA (cfDNA) in saliva for one week at room temperature, improving sample reliability.
Area of Science:
- Biochemistry
- Oncology
- Molecular Diagnostics
Background:
- Liquid biopsy using cell-free DNA (cfDNA) is a developing area for cancer screening and monitoring.
- Blood-based liquid biopsies are widely studied, but other body fluids offer unique advantages.
- Saliva is a noninvasive, repeatable biofluid that may contain cfDNA relevant to certain cancers.
Purpose of the Study:
- To evaluate pre-analytical variables affecting cfDNA stability in saliva specimens.
- To identify optimal collection devices and preservatives for saliva-based cfDNA analysis.
- To enhance the reliability of saliva as a diagnostic medium for cancer.
Main Methods:
- Collected saliva from healthy individuals.
- Tested various collection devices and preservatives for their impact on cfDNA.
- Assessed cfDNA recovery and stability under different pre-analytical conditions.
- Utilized Novosanis's UAS preservative for stabilization tests.
Main Results:
- Identified key pre-analytical variables influencing saliva cfDNA stability.
- Demonstrated that Novosanis's UAS preservative effectively stabilized cfDNA.
- Achieved cfDNA stabilization at room temperature for up to one week using the UAS preservative.
- Showcased improved cfDNA recovery and stability with specific collection methods and preservatives.
Conclusions:
- Standardization of pre-analytical steps is crucial for saliva-based liquid biopsies.
- The UAS preservative offers a viable solution for stabilizing saliva cfDNA.
- This research provides foundational data for developing standardized saliva collection protocols.
- Findings support the advancement of saliva liquid biopsy for cancer diagnostics.
