NCT06479811 2026-04-28[212Pb]VMT-Alpha-NET in Metastatic or Inoperable Somatostatin-Receptor Positive Gastrointestinal Neuroendocrine Tumors, Pheochromocytoma/Paragangliomas, Small Cell Lung, Renal Cell, and Head and Neck CancersNational Institutes of Health Clinical Center (CC)Phase 1 Recruiting120 enrolled