Natural human HFtn nanocages can be used as a carrier for PTX to form HFtn-PTX for targeted delivery, which can bind tumour cells by interacting with CD71, leading to endocytosis, and apoptosis assays show that HFtn-PTX has similar apoptotic characteristics to free PTX for MDA-MB-231 cells.66 The gene discussed is TFRC; the disease is neoplasm.