The systematic study of circulating tumor cell isolation using lithographic microfilters.

Area of Science:

• Biomedical Engineering
• Cancer Research
• Microfluidics

Background:

• Circulating tumor cells (CTCs) are crucial biomarkers for solid malignancies.
• Current CTC isolation methods, particularly size exclusion techniques, face limitations in design optimization.
• Microfiltration systems are widely used but lack design flexibility, hindering CTC capture efficiency.

Purpose of the Study:

• To develop and optimize a novel microfiltration system for efficient CTC isolation.
• To investigate the impact of microfilter design parameters on CTC capture.
• To compare the performance of the novel microfilter with standard filtration membranes.

Main Methods:

• Utilized a photo-definable material and photolithographic fabrication for scalable microfilter production.
• Systematically studied and optimized microfilter parameters, including pore size, pore density, and pattern uniformity.
• Compared the capture efficiency of optimized microfilters against standard membranes using MCF-7 cancer cells.

Main Results:

• Demonstrated that optimized microfilters with uniform patterned distributions, ≥160,000 pores, and 7 μm pore diameters achieve high CTC capture rates.
• Achieved a capture rate of 98 ± 2% for MCF-7 cancer cells with the optimized microfilters.
• Showcased the potential of photolithographic fabrication for creating customizable and efficient CTC isolation devices.

Conclusions:

• Optimized microfilter design is critical for enhancing CTC capture efficiency in liquid biopsies.
• Photolithographic fabrication offers a scalable and adaptable approach for developing advanced CTC isolation technologies.
• This novel microfiltration system holds promise for improving early cancer detection, diagnosis, and monitoring.