In their approach, Giesel et al. related lymph node density in Hounsfield units in NECT to malignancy in a broad PET/CT study investigating various malignant entities (lung cancer, malignant melanoma, prostate cancer, gastroenteropancreatic neuroendocrine tumors) using different PET-tracers (18F-FDG, 68Ga-DOTATOC, 68Ga-labeled prostate-specific membrane antigen), but without including patients with Hodgkin's disease39. This evidence concerns the gene FOLH1 and lung cancer.