We still opted to functionalize our membranes with an anti‐EpCAM antibody to maximize the number of CTCs that can be enriched, since recovery rates were nonsignificantly improved by functionalizing the membrane with antibodies against surface‐specific antigens such as EpCAM and EGFR, using either SHP‐77 and MDA‐MB‐468 cells, respectively, as every single CTC can carry relevant information and represent a tumor's heterogeneity. Here, EGFR is linked to neoplasm.