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Circulating tumor cells (CTCs), as potential cancer biomarkers, play a crucial role in cancer diagnosis, prognosis and treatment. However, there are still significant challenges due to their rarity. In this paper, a label-free and ultrasensitive electrochemical impedance cytosensor was developed by a galactosylated gold-nanoisland (Gal-GNI) biointerface for the capture and detection of rare cancer...