Cited by 96Cancer Genomics and DiagnosticsClinical Laboratory Practices and Quality ControlPrenatal Screening and Diagnostics

Recommendations for Cell-Free DNA Assay Validations

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Lockwood, Christina M., Borsu, Laetitia, Cankovic, Milena, Earle, Jonathan S.L., Gocke, Christopher D., Hameed, Meera, Jordan, Danielle, Lopategui, Jean R. +7 more·2023·The Journal of Molecular Diagnostics

Abstract

Diagnosing, selecting therapy for, and monitoring cancer in patients using a minimally invasive blood test represents a significant advance in precision medicine. Wide variability exists in how circulating tumor DNA (ctDNA) assays are developed, validated, and reported in the literature, which hinders clinical adoption and may negatively impact patient care. Standardization is needed for factors affecting ctDNA assay performance and reporting, including pre-analytical variables, analytical considerations, and elements of laboratory assay reporting. The Association for Molecular Pathology Clinical Practice Committee's Liquid Biopsy Working Group (LBxWG), including organizational representation from the American Society of Clinical Oncology and the College of American Pathologists, has undertaken a full-text data extraction of 1228 ctDNA publications that describe assays performed in patients with lymphoma and solid tumor malignancies. With an emphasis on clinical assay validation, the LBxWG has developed a set of 13 best practice consensus recommendations for validating, reporting, and publishing clinical ctDNA assays. Recommendations include reporting key pre-analytical considerations and assay performance metrics; this analysis demonstrates these elements are inconsistently included in publications. The LBxWG recommendations are intended to assist clinical laboratories with validating and reporting ctDNA assays and to ensure high-quality data are included in publications. It is expected that these recommendations will need to be updated as the body of literature continues to mature.

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  • Pre-analytical variables including collection tube type, sample volume, time to processing, centrifugation protocol, storage conditions, freeze-thaw exposure, DNA extraction method, cfDNA input, sequencing depth, and error-suppression strategy can affect assay performance.

    “Collection tube type, sample volume, time to processing, centrifugation protocol, storage conditions, freeze–thaw exposure, DNA extraction method, cfDNA input, sequencing depth, and error-suppression strategy can all affect assay performance [ 11 , 12 ].”
  • Tumor-informed assays can improve sensitivity by tracking patient-specific alterations identified from tissue sequencing.

    “Tumor-informed assays can improve sensitivity by tracking patient-specific alterations identified from tissue sequencing”
  • MRD detection requires substantially greater analytical sensitivity than baseline genotyping because tumor-derived DNA may be present at very low levels after surgery or definitive therapy.

    “MRD detection is the most clinically ambitious use of ctDNA in sarcoma. It requires substantially greater analytical sensitivity than baseline genotyping because tumor-derived DNA may be present at very low levels after surgery or definitive therapy [ 5 , 9 , 10 , 11 , 12 ].”
  • Blood collection tube type, sample volume, time from venipuncture to plasma separation, centrifugation protocol, storage temperature, freeze-thaw exposure, and cfDNA extraction method can influence cfDNA yield, leukocyte DNA contamination, fragment size, tumor fraction, and downstream assay performance.

    “Blood collection tube type, sample volume, time from venipuncture to plasma separation, centrifugation protocol, storage temperature, freeze–thaw exposure, and cfDNA extraction method can all influence cfDNA yield, leukocyte DNA contamination, fragment size, tumor fraction, and downstream assay performance [ 5 , 11 , 12 , 40 ].”

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Authors
Lockwood, C. M., Borsu, L., Cankovic, M., Earle, J. S. L., Gocke, C. D., Hameed, M., Jordan, D., Lopategui, J. R., Pullambhatla, M., Reuther, J., Rumilla, K. M., Tafe, L. J., Temple-Smolkin, R. L., Terraf, P., & Tsimberidou, A. M.
Affiliations
  • University of Washington (US)
  • Memorial Sloan Kettering Cancer Center (US)
  • Henry Ford Hospital (US)
  • Hartford Hospital (US)
  • Johns Hopkins University (US)
  • Association for Molecular Pathology (US)
  • Cedars-Sinai Medical Center (US)
  • Invitae (United States) (US)
  • Mayo Clinic (US)
  • Dartmouth–Hitchcock Medical Center (US)
  • The University of Texas MD Anderson Cancer Center (US)
Corresponding author
Lockwood, Christina M.
Venue
The Journal of Molecular Diagnostics
Publisher
Elsevier BV
Published
2023-12
Volume
25
Issue
12
Pages
876-897
ISSN
1525-1578 (ISSN-L)
OpenAlex
W4387398478
Cited by
96
References
82
Citations by year
2026: 45 · 2025: 27 · 2024: 23 · 2023: 1
FWCI
12.23
Type
journal article
Language
en
Open access
Locations
  • Journal of Molecular Diagnostics (publishedVersion)
  • PubMed (publishedVersion)
Funders
Association for Molecular Pathology
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer Genomics and Diagnostics
  • Health Sciences › Medicine › Physiology › Clinical Laboratory Practices and Quality Control
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Prenatal Screening and Diagnostics
Keywords
circulating tumor DNA, liquid biopsy, assay standardization, pre-analytical variables, lymphoma, solid tumors, precision oncology
MeSH terms
Pathologists, Cell-Free Nucleic Acids, Humans, Neoplasms, United States, Consensus, Pathology, Molecular

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