Optimal whole blood dilution protocol for preprocessing samples prior to circulating tumor cell capture by size-based...

Area of Science:

• Biomedical Engineering
• Oncology
• Cell Biology

Background:

• Circulating tumor cells (CTCs) are crucial biomarkers for cancer detection and monitoring.
• Efficient pre-processing of blood samples is vital for accurate CTC capture.
• Current methods like density gradient centrifugation have limitations in CTC recovery.

Purpose of the Study:

• To compare the efficiency of whole blood dilution versus density gradient centrifugation for CTC isolation.
• To optimize a whole blood dilution protocol for enhanced CTC capture.
• To evaluate the effectiveness of size-based isolation of CTCs after different pre-processing methods.

Main Methods:

• Optimization of whole blood dilution parameters including sample volume, dilution ratio, and paraformaldehyde (PFA) concentration.
• Spiking of healthy volunteer blood with various cancer cell lines (SKBR3, A549, PC3).
• Comparison of the optimized whole blood dilution protocol with density gradient centrifugation using spiked blood and patient samples.

Main Results:

• Optimized whole blood dilution yielded significantly higher recovery rates for spiked SKBR3, A549, and PC3 cells (87.67%, 79.50%, and 71.83% respectively) compared to density gradient centrifugation (46.83%, 37.00%, and 41.00% respectively).
• The optimal dilution protocol involved 5 ml of whole blood, 2.5 ml buffer, and 0.2% PFA.
• Statistical analysis confirmed the significant difference in recovery rates between the two methods.

Conclusions:

• Whole blood dilution is a superior pre-processing method for CTC capture compared to density gradient centrifugation.
• The optimized whole blood dilution protocol enhances the efficiency of size-based CTC isolation.
• This improved pre-processing technique holds promise for more sensitive cancer detection and monitoring through CTC analysis.