Related Experiment Video
Updated: Sep 18, 2025
05:26
A Standardized Liquid Biopsy Preanalytical Protocol for Downstream Circulating-Free DNA Applications
Published on: September 16, 2022
4.1K
Minimum Technical Preanalytical, Patient, and Clinical Context Data Elements for Cerebrospinal Fluid Liquid Biopsy:
Stephen J Bagley1, Nike Beaubier2, Leonora Balaj3
1University of Pennsylvania Perelman School of Medicine, Philadelphia, PA.
JCO Precision Oncology
|June 26, 2025
Summary
Cerebrospinal fluid (CSF) liquid biopsy offers a promising alternative to blood tests for detecting cell-free DNA (cfDNA) in brain tumors. Standardizing preanalytical variables is crucial for reliable CSF cfDNA analysis in CNS malignancies.
Area of Science:
- Oncology
- Molecular Diagnostics
- Neuroscience
Background:
- Liquid biopsy using cell-free DNA (cfDNA) is challenging for central nervous system (CNS) cancers due to low tumor material in blood.
- Cerebrospinal fluid (CSF) contains higher concentrations of tumor-derived cfDNA, making it a viable alternative for brain tumor (BT) molecular profiling.
- The field of CSF liquid biopsy is emerging, with a need to address preanalytical variables impacting assay performance.
Purpose of the Study:
- To identify and standardize key preanalytical variables for cfDNA-based CSF liquid biopsy in patients with brain tumors.
- To address critical unanswered questions regarding preanalytical factors affecting CSF liquid biopsy assay performance.
- To establish a foundation for reliable molecular profiling in CNS malignancies.
Main Methods:
- A review of CSF sample collection and processing protocols from expert members of the Blood Profiling Atlas in Cancer (BLOODPAC) Consortium's BT Working Group.
- Inclusion of literature review on CSF liquid biopsy techniques.
- A collaborative and iterative process to develop a comprehensive list of preanalytical variables.
Main Results:
- Agreement on a recommended list of preanalytical minimum technical data elements, clinical context data elements, and patient context data elements for cfDNA-based CSF liquid biopsy.
- Identification of a subset of critical priority variables designated as required annotations for data submission to the BLOODPAC Data Commons.
- Establishment of standardized data elements for cfDNA analysis in CNS malignancies.
Conclusions:
- A proposed list of preanalytical variables for cfDNA-based CSF liquid biopsy in CNS malignancies.
- Encouraging the routine collection and reporting of these variables in future research studies.
- Aimed at improving the reliability and reproducibility of CSF liquid biopsy for brain tumor diagnostics and research.
