TSPO and glioblastoma: Accordingly, dual PET imaging studies including other tracers than [18F]FET in IDH-wildtype glioblastoma, such as TSPO-ligands which offer complementary information to the [18F]FET uptake [49], are of high potential to further increase the power of survival prediction models, as exemplified by recent successful multi-tracer PET prediction approaches in other entities, such as prostate cancer [50].