CBS and malignant colon neoplasm: To achieve this, Yang's lab recently designed a H2S activated nanomaterial, Cu2O (21 nm), for colon cancer (HCT‐116, CBS overexpression) theranostics (Figure17A).54 After encountering endogenous H2S at the tumor site, Cu2O formed Cu9S8 which absorbed NIR irradiation (808 nm) and increased the tumor tissue temperature by 20.7 °C.