Inclusion Criteria:  Pathology 1.1. Histologically confirmed diagnosis of neuroblastoma 1.2. Immunohistochemical staining for somatostatin receptors (SSTR) performed from primary tumor tissue when available Relapsed or primary refractory high-risk neuroblastoma: International Neuroblastoma Staging System (INSS) stage 4 disease or International Neuroblastoma Risk Group Staging System (INRGSS) stage M disease Age >18 months and < 18 years of age at the time of enrolment into this study Life expectancy of greater than 3 months Performance Status 5.1. Karnofsky > 50% (for patients > 12 years of age) 5.2. Lansky > 50% (for patients ≤ 12 years of age) Prior treatment 6.1. Two-week washout from any prior treatment 6.2. Patients must have recovery of hematological toxicity following previous therapy 6.3. Adequate recovery from major surgery prior to receiving study treatment Diagnostic imaging 7.1. Uptake in the primary tumor or metastatic tumour deposits on 68Ga-DOTATATE PET/CT at least higher than the liver uptake and performed within two months prior to registration 7.2. 123I-mIBG scintigraphy to be performed within two months prior to registration 7.3. CT or MRI of the primary tumor and bulky metastatic sites within two months prior to registration Laboratory requirements to be performed within 7 days prior to commencing trial treatment 8.1. Hematology: 8.1.1. Hemoglobin, If Hb is <120 g/L then patient will receive a blood transfusion prior to commencing trial treatment 8.1.2. Absolute neutrophil count > 1.0 x 109/L 8.1.3. Absolute Platelets > 100 x 109/L 8.2. Biochemistry: 8.2.1. Bilirubin within 1.5 x ULN 8.2.2. ALT within 2.5 x ULN 8.2.3. AST within 2.5 x ULN 8.2.4. GGT within 5 x ULN 8.2.5. ALP within 5 x ULN 8.2.6. Glomerular filtration rate >50mL/min/1.73m2 assessed by a recognised method, such as inulin, 51Cr-EDTA, 99mTc-DTPA or iohexol clearance and performed within 2 months prior to registration 8.2.7. Urinary catecholamine metabolites measured within 2 months prior to registration Peripheral blood stem cells (PBSC) 9.1. A minimum of 4 x106 CD34+ cells/kg (optimally 6 x106 CD34+ cells/kg) must be available for each study subject prior to registering Written informed consent from patient and/or parent(s) or legal guardian(s) in accordance with national regulations, prior to registration or any trial-related screening procedures  Exclusion Criteria:  Not fit enough to undergo proposed study treatment, as assessed by national PI, considering precautions defined in the latest version of the Lutathera SmPC Pregnant or lactating patient Concurrent treatment with any anti-tumor agents Prior treatment with other radiolabeled somatostatin analogues Any psychological, familial, sociological or geographical condition potentially hampering compliance with the study protocol and follow-up schedule; those conditions should be discussed with the patient or legal guardian before registration in the trial Hypersensitivity to any component of the investigational drug Lutathera® Treatment with long-acting somatostatin analogues within 30 days prior the administration of Lutathera®