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Triple-negative breast cancer has few biomarkers to guide benefit from immunotherapy; furthermore, the biochemical features of the tumor microenvironment including acidosis, hypoxia, and high hydrogen peroxide concentrations, significantly modulate cancer cell metabolism and metastatic potential, and associate with bad outcomes from chemo-radiotherapy and surgery. Herein, a theranostic nanocomposite with a dual imaging modality and chemical phototherapeutic capacity has been used for breast cancer cell inhibition, which is developed to self-assemble superparamagnetic iron oxide nanocrystals and IR-780 iodides in one system. Due to the magnetic resonance and near-infrared Ⅱ fluorescence capacity, this nanocomposite serves as a contrast agent for the high-sensitivity, accurate cancer diagnosis and facilitates imaging-guided phototherapy. Furthermore, this nanocomposite not only performs dual …