To detect circulating tumor cells (CTCs) in the blood of Dplhi and Dpllow patients, we devised an in‐house microfluidic chip model that was coated with Doppel antibody (Dpl‐Ab) (Figure 5A) and identified CTCs based on their expression of Dapi, EpCAM and cytokeratin, while noting the absence of CD45 expression in CTCs (Figure 5B). The gene discussed is PTPRC; the disease is neoplasm.