To examine the tumor-delivery efficiency of IL4rP-conjugated TRAIL-ATNCs (TRAIL-ATNCIL4rP), we intravenously injected mice bearing MDA-MB-231 tumor xenografts with FPI774-labeled TRAIL-ATNCIL4rP, TRAIL-ATNC or TRAIL, and then scanned mice using an IVIS imaging system at different post-injection times. The gene discussed is TNFSF10; the disease is neoplasm.