In designing a scheme based on the advantages of self-assembled peptides, Yingying Tang et al. first captured BC cells using nucleolin adaptor AS1411, which was immobilized on the electrode surface, which subsequently bound self-assembled peptide nanofibers targeting the stemness marker CD44 to BC stem cells, and finally recruited electroactive silver nanoparticles to generate electrochemical signals [132]. The gene discussed is CD44; the disease is breast cancer.