MKI67 and neoplasm: Either tumour uptake on MIBG (p = 1.0), 68Ga-PET/CT (p = 1.0) or 18F-FDG-PET/CT (0.58), the Ki67 index (cut off 3% (p = 1) or 10% (p = 0.63)), tumour functionality (p = 0.63), timing of metastases (p = 0.63) or primary tumour location (p = 0.54) influenced the response to first-line chemotherapy (Table 3).