Numerous nano‐ and micro‐techniques have been developed to decode the fundamental mechanisms and track the expansion of complex artificial tumor tissues.[399, 400, 401, 402, 403, 404, 405, 406, 407, 408] For instance, one work used a nanostructured herringbone (nano‐HB) microfluidic chip to enhance exosome capturing (Figure 28a).[409] They utilized a microchannel platform to induce evaporation‐driven colloidal self‐assembly (CSA) into designated nanopatterns (Figure 28b), which were modified with anti‐CD81 monoclonal antibody to capture tumor exosomes. The gene discussed is CD81; the disease is neoplasm.