Figure S1. Characterization of CeO2NPs conjugated with murine serum albumin; Table S1: CT contrast values (H.U.) corresponding to Figure 2 of the main article; Figure S2. Examples of in vivo 3D rendering videos before injection of CeO2NPs and 2 h after intravenous injection; Figure S3. CT coronal images 5 min and 24 h after intravenous injection of CeO2NPs-MSA; Figure S4. In vivo 3D rendering videos and their corresponding snapshots were recorded at 15 min, 24h and 7 days post-intratumoral injection; Table S2. ICP-MS analysis of organs after intratumoral injection; Figure S5. CeO2NPs-albumin conjugated and naked CeO2NPs capacity to scavenge hydrogen peroxide. Figure S6. (Left) Mouse anesthetized before a CT scans. (Right) Mouse placed in the plate of the Quantum FX micro-CT instrument (Perkin Elmer, Waltham, MA). References [57,63] are cited in the supplementary materials.

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