Interestingly, the contralateral signal elevation was also strongly associated with the tumor volume as assessed via TSPO-PET (R = 0.601, P = 0.00027) and MRI [contrast enhancement (CE): R = 0.367, P = 0.039; T2 signal alteration: R = 0.518, P = 0.0024; Fig. 2B and C] but not amino acid PET ([18F]FET; R = 0.376, P = 0.077). This evidence concerns the gene TSPO and neoplasm.