To demonstrate an Hsp70-specific internalization of TPP-PEG4-FeAuNPs into mHsp70-positive MDA-MB-231 tumor cells, but not in mHsp70-negative PBL, both cell types were incubated with FITC-labeled TPP-PEG4-FeAuNPs as described above. This evidence concerns the gene HSPA1A and neoplasm.