By contrast, high percentage of TUNEL positive cells (green fluorescence in images) were found in the tumor areas by the treatment of Hb@Hf‐Ce6 NPs combined with X‐ray irradiation and anti‐PD‐1 antibody, suggesting lots of tumor cells underwent apoptosis after treatments (Figure 5f; Figure S12, Supporting Information). The gene discussed is GSTM1; the disease is neoplasm.