[177Lu]Lutetium-DOTA-DPhe1, Tyr3-octreotate ([177Lu]Lu-DOTA-TATE), is an analog of somatostatin with high affinity to somatostatin receptor type 2 (SSTR2) (1), which is overexpressed in various neuroendocrine tumors (NETs), including pheochromocytomas/paragangliomas. The gene discussed is SSTR2; the disease is pheochromocytoma.