Background: Peptide receptor radionuclide therapy (PRRT) is an effective form of treatment for patients with metastatic neuroendocrine tumors (NETs). However, delivering sufficient radiation dose to the tumor to result in a high percentage of long-term tumor remissions remains challenging because of the limits imposed on administered activity levels by radiation damage to normal tissues. The goal of this study was to evaluate the dosimetric advantages of adding (131)I meta-iodobenzylguanidine ((131)I-MIBG) to (90)Y DOTA Phe1-Tyr3-octreotide ((90)Y-DOTATOC) in patients with advanced stage midgut NETs.
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