The metabolic characterization of tumors is possible with this blood test, since elevated TKTL1 levels in macrophages correlated with an increased glucose uptake by the 18fluor-desoxyglucose (FDG) PET-imaging, and so tumor patients eligible for 18FDG-PET imaging can be identified by the EDIM-TKTL1 blood test [1]. Here, TKTL1 is linked to neoplasm.