TSPO and neoplasm: A voxel-by-voxel correlation was carried out in TSPO PET, amino-acid PET, and T1-weighted MRI to assess differences in PET-signal intensity (i.e., TBR) within the tumor and to establish whether or not [18F]GE-180 uptake was correlated with BBB leakage and therefore partially or completely attributable to non-specific tracer accumulation.