Analytical evaluation of circulating tumor DNA sequencing assays

Area of Science:

• Molecular Biology
• Genomics
• Biotechnology

Background:

• Circulating tumor DNA (ctDNA) analysis is a key tool in cancer research and diagnostics.
• Numerous ctDNA assays are available in China, necessitating systematic evaluation for informed selection.

Purpose of the Study:

• To systematically evaluate the performance of nine commercially available ctDNA assays in China.
• To compare these assays against a benchmark assay across various analytical parameters.

Main Methods:

• Evaluation of nine ctDNA assays using 23 contrived reference samples.
• Assessment of sensitivity, specificity, and reproducibility across different sample types, ctDNA inputs, variant allele frequencies, and variant types.
• Analysis included cell-free DNA extraction to bioinformatics.

Main Results:

• Most evaluated ctDNA assays demonstrated high analytical sensitivity, performing comparably or superiorly to the benchmark assay.
• Variations in extraction efficiency, quantification, sensitivity, and reproducibility were noted, particularly with low ctDNA inputs.
• Performance differences were observed across different sample types, input levels, and variant types.

Conclusions:

• The findings provide crucial guidance for selecting appropriate ctDNA assays for research and clinical applications in China.
• Consideration of multiple technical parameters, including input DNA quantity, is essential for optimal assay performance.
• The study highlights the need for ongoing evaluation of ctDNA assays to ensure reliable cancer diagnostics.