For CTC capture, antibody-coated magnetic beads are used in the Magnetic-Activated Cell Separation (MACS) method (Miltenyi Biotec, Germany).85 Additionally, the Geometrically Enhanced Differential Immunocapture method combines microfluidics with different antibodies according to the kind of tumor (tumor includes, for instance, HER2 in breast cancer and PSMA in prostate cancer) and positive for cytokeratin for counting.161. Here, ERBB2 is linked to breast cancer.