A Study to Evaluate a New Way to Identify/Diagnose Tumours With Somatostatin Receptors Using [68]Ga-HA-DOTATATE and to Ensure it is Safe to Use

Inclusion Criteria: 1. Known or suspected somatostatin receptor positive tumour including, but not limited to, GNET, PNET, pulmonary NET, PRUNK NET, pheochromocytoma, paraganglioma, medullary thyroid cancer, and medulloblastoma. A standard CT obtained within 6 months of enrolment is required. A standard MRI obtained within 6 months of enrolment is optional. Additional supporting evidence obtained within 12 months of enrolment may include: other standard imaging (In-111 octreotide (Octreoscan), \[18\]F-FDG PET, or \[18\]F-FDOPA PET); histopathology from surgery or biopsy; elevated biochemical markers (including Chromogranin A, 5-HIAA, insulin, vasoactive intestinal peptide (VIP), glucagon, gastrin, metanephrines, and/or others, as clinically indicated); and/or persistent carcinoid-like symptomology highly suspicious for the presence of NET even in absence of pathologic imaging findings by anatomic criteria; 2. Eastern Cooperative Oncology Group (ECOG) Performance Scale Score ≤ 3 within 2 weeks of enrolment; 3. At least 14 years of age; 4. Able and willing to follow instructions and comply with the protocol; 5. Ability to provide written informed consent prior to participation in the study. Exclusion Criteria: 1. Inability to lie still for the entire imaging time (e.g. cough, severe arthritis, etc.); 2. Inability to complete the needed investigational and standard-of-care imaging examinations due to other reasons (severe claustrophobia, radiation phobia, etc.); 3. Any additional medical condition, serious inter-current illness or other extenuating circumstance that, in the opinion of the Investigator, may significantly interfere with study performance or interpretation; 4. Weight exceeding the PET/CT or PET/MR scanner limit; 5. Pregnancy; 6. Allergic reaction to DOTATATE or somatostatin analogues.