NRP1 and neoplasm: AGuIX-TPP is a polysiloxane-based nanoplatform (AGuIX, Activation and Guidance of Irradiation by X-ray) that combines a photosensitizer (PS); the magnetic resonance imaging (MRI) contrast agent gadolinium (Gd); and a peptide ligand motif (KDKPPR) targeting neuropilin-1 (NRP-1), a receptor overexpressed by vascular tumor endothelial cells and glioblastoma cells (Figure 1) [29].