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The capacity to diagnose cancer with the existing endogenous biomarkers remains limited because biomarkers usually act at the tumor site and are thus challenging to be detected directly from body fluids with high sensitivity and specificity, especially in the early stage of tumorigenesis. Here, we demonstrate an exogenous tumor-penetrating nanomarker composed of fluorescent nanoparticles conjugated with specific fluorescein-labeled peptides. The injectable nanomarkers perform four functions they penetrate the tumor, target sites of cance