Who can participate?

Inclusion Criteria:

• Participant is able and willing to provide informed consent (≥18 years), or informed consent is obtained by the parent or legal guardian for minor participants, with the minor providing age appropriate assent, according to local law and regulations;
• Life expectancy ≥ 12 weeks;
• Known high-risk neuroblastoma OR previously intermediate-risk neuroblastoma that has relapsed or progressed to high-risk, with failure to achieve complete response with standard therapy (defined as at least 4 cycles of aggressive multi-drug induction chemotherapy with or without radiation and surgery, or according to a standard high-risk treatment/neuroblastoma protocol), OR who are medically ineligible to receive standard treatment OR who are intolerant to standard treatment;
• Adequate recovery from acute toxic effects of any prior therapy, as deemed by the Investigator or treating Sub-Investigator;
• Adequate liver function as defined by the following laboratory values obtained within 28 days prior to administration of 64Cu-SARTATE: Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) < 3.0 x upper limit of normal (ULN);
• Adequate renal function;
• Adequate laboratory parameters: Absolute neutrophil count > 1.0 x 10 9/L; Platelet count > 50 x 10 9/L; Total bilirubin <1.5 x ULN;
• Karnofsky or Lansky performance status ≥50;
• All participants must have a hematopoietic stem cell product available (minimum CD34+ cell dose is ≥2 x 10 6 cells/kg);
• Sexually active participants of reproductive potential must practice an effective method of birth control while participating on this study, to avoid possible damage to the fetus. Abstinence is considered acceptable;
• 64Cu-SARTATE uptake on the 4 hour scan (SUVmax) of any lesion equal to or higher than that of the liver in order to move on to the therapy phase of the study.

Exclusion Criteria:

• Participants with disease of any major organ system that would compromise their ability to tolerate therapy, as deemed by the Investigator or treating Sub-Investigator;
• Any other active malignancy, or a history of prior malignancy within the past 3 years;
• History of cardiac failure as evidenced by: dyspnea at rest, exercise intolerance, oxygen requirement, clinically significant cardiac dysfunction;
• Planned administration of chemotherapy, anti-cancer cytokine therapy, immunotherapy or radiotherapy within 2 weeks prior to the administration of 64Cu-SARTATE;
• Administration of therapeutic dose of 131I-MIBG within 8 weeks prior to the administration of 64Cu-SARTATE;
• External beam radiation therapy (EBRT) to both kidneys or a single functioning kidney within 12 months prior to the administration of 64Cu-SARTATE;
• Administration of any investigational agents within 21 days prior to administration of 64Cu-SARTATE;
• Treatment with long acting somatostatin analogues (administered within 28 days prior to the administration of 64Cu-SARTATE), or short acting somatostatin analogues (administered within 24 hours prior to the administration of 64Cu-SARTATE);
• Known sensitivity or allergy to somatostatin analogues;
• Previous peptide receptor radionuclide therapy (PRRT);
• Female participants who are pregnant or lactating;
• Participants who are on hemodialysis;
• QTc interval ≥ 0.45 seconds as measured by Screening ECG;
• Participants with uncontrolled infection(s);
• Any medical condition which the Investigator feels may interfere with the procedures or evaluations of the study;
• Participants 12 months and younger will be excluded from cohorts where the planned single or cumulative administered activity is modelled to deliver a radiation dose to the marrow that exceeds 2 Gy.