Maximizing Cytologic Specimen Supernatants: a New Player in the Molecular Toolbox

Area of Science:

• Cytopathology
• Molecular Diagnostics
• Nucleic Acid Extraction

Background:

• Cytopathologists utilize various cytologic preparations for molecular testing (MT).
• Residual cytology specimens and cytology specimen supernatants (CSS) are emerging sources for nucleic acid extraction.
• CSS, typically discarded, can be repurposed for MT, preserving cellular material for other studies.

Purpose of the Study:

• To evaluate the utility of CSS for molecular testing.
• To understand the metrics for evaluating MT on CSS, including nucleic acid quantity, tumor percentage, and quality.
• To assess the impact of CSS on specimen contamination and turnaround time.

Main Methods:

• Review of studies evaluating analytic and clinical value of MT on CSS.
• Analysis of nucleic acid quantity (degradation value) and quality (sequencing-derived metrics, concordance).
• Assessment of specimen contamination and turnaround time in MT performed on CSS.

Main Results:

• CSS contains both cellular (genomic) and cell-free nucleic acid.
• MT on CSS demonstrates advantages in reduced specimen contamination and improved turnaround times.
• Variations in nucleic acid quantity and quality indicate a need for further specimen optimization.

Conclusions:

• CSS is a viable source for molecular testing, offering significant benefits.
• Understanding MT evaluation metrics is crucial for utilizing CSS effectively.
• Further optimization of CSS processing is recommended for broader clinical adoption.