Except for these examples, the administration of 99mTc-hydrazinopyridine-3-carboxylic acid (HYNIC)-SSTR2 and 68Ga- and 18F-labeled SSTR2 is increasing for tumor detection in patients with NETs because of the higher sensitivity of this technique and the shorter time needed for the investigation in comparison to SPECT imaging [162,163]. The gene discussed is SSTR2; the disease is neoplasm.