PGP and neoplasm: This observation was confirmed by the mini-PET scans, since no significant 18FDG accumulation was observed at the sites of tumor cell inoculation in these animals, as reflected by the T/M 18FDG accumulation ratios being close to 1 (T/M = 1.1±0.2 for Pgp+ and T/M = 0.97±0.1 for Pgp- tumors; (n = 4)).