NRP1 and neoplasm: AuNPs attached to the RGD peptide achieve site‐specific tumor accumulation, effectively improving the efficiency of RT.[133] iRGD (CRGDK/RGPD/EC) is a tumor‐homing peptide that can effectively deliver therapeutic molecules to tumors.[134] Neuropilin‐1 (NRP‐1) is overexpressed on the surface of blood vessels and head and neck squamous cell carcinoma tumor cell membranes and can be recognized by the CRGDK peptide.[135] Xu et al.