Panel A. Fluorescence images from tumor (T), Liver (L), Intestine (I), Pancreatobiliary (P), Spleen (S), Kidney (K), Brain (B), bisected heart (H), and Lungs (Lu) of a mouse bearing an orthotopic liver tumor generated after injecting Hep3B cells into the liver. Panel B. Relative tissue distribution of C60-serPF in mouse tissues, demonstrating accumulation in most tissues at 16-hours and predominantly in the kidney, liver, and liver cancer. (n=3) Panel C. Pharmacokinetics of fullerene uptake in select tissues, suggesting early renal clearance and a delayed hepatic clearance. C60-serPF localizes to the brain and tumor within 16 hours and persists for more than one week (one mouse per time point represented).