title: The "orphan drug" problem in radiopharmaceutical research and development.
mesh_terms: D019797:3-Iodobenzylguanidine; D000301:Adosterol; D000302:Adrenal Cortex / Q000000981:diagnostic imaging*; D000310:Adrenal Gland Neoplasms / Q000000981:diagnostic imaging; D000313:Adrenal Medulla / Q000000981:diagnostic imaging*; D003480:Cushing Syndrome / Q000000981:diagnostic imaging; D006801:Humans; D007462:Iodobenzenes; D010673:Pheochromocytoma / Q000000981:diagnostic imaging; D011877:Radionuclide Imaging; D012106:Research; D013261:Sterols; D014481:United States; D014486:United States Food and Drug Administration
chemical_list: D007462:Iodobenzenes; D013261:Sterols; D019797:3-Iodobenzylguanidine; D000301:Adosterol