Rare cell isolation and profiling on a hybrid magnetic/size-sorting chip

Area of Science:

• Biomedical Engineering
• Cancer Biology
• Microfluidics

Background:

• Circulating tumor cells (CTCs) are crucial biomarkers for cancer diagnosis, prognosis, and treatment monitoring.
• Existing methods for CTC isolation often face challenges with low throughput, bias, and complex workflows.
• Accurate and efficient isolation of CTCs is essential for downstream molecular analyses and understanding cancer heterogeneity.

Purpose of the Study:

• To develop and validate a hybrid magnetic/size-sorting (HMSS) chip for high-throughput, unbiased isolation of CTCs.
• To enable simultaneous molecular analyses of individual CTCs directly on the chip.
• To facilitate the study of CTC heterogeneity in molecular marker expression.

Main Methods:

• The HMSS chip integrates self-assembled magnets for high magnetic forces and a weir-style structure for size-based cell sorting.
• The chip performs negative and positive cell selection for unbiased CTC enrichment from whole blood.
• On-chip molecular staining allows for direct analysis of isolated CTCs.

Main Results:

• The HMSS chip demonstrated efficient, one-step isolation and single-cell detection of spiked CTCs from whole blood.
• The system achieved high throughput and unbiased enrichment of CTCs.
• The device successfully facilitated molecular analyses of individual CTCs, revealing heterogeneity in marker expression.

Conclusions:

• The HMSS chip offers a powerful and versatile platform for CTC isolation and molecular characterization.
• This technology has the potential to advance cancer diagnostics and personalized medicine by enabling detailed analysis of CTCs.
• The HMSS chip provides a foundation for further research into CTC biology and its clinical implications.