HSPA1A and neoplasm: We studied the radiosensitizing effect of novel Hsp70-specific, hybrid iron oxide–gold (Fe3O4-Au) nanoparticles (NPs) functionalized with the Hsp70 peptide TPP via a PEG4 linker (TPP-PEG4) to target tumor-specific membrane Hsp70 (mHsp70) on TNBCs.