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Effects of Repeated I-131-Meta-Iodobenzylguanidine Radiotherapy on Tumor Size and Tumor Metabolic Activity in Patients with Metastatic Neuroendocrine Tumors

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Title: Effects of Repeated I-131-Meta-Iodobenzylguanidine Radiotherapy on Tumor Size and Tumor Metabolic Activity in Patients with Metastatic Neuroendocrine Tumors
Authors: Yoshinaga, Keiichiro Browse this author
Abe, Takashige Browse this author →KAKEN DB
Okamoto, Shozo Browse this author →KAKEN DB
Uchiyama, Yuko Browse this author
Manabe, Osamu Browse this author
Ito, Yoichi M. Browse this author →KAKEN DB
Tamura, Naomi Browse this author →KAKEN DB
Ito, Natsue Browse this author
Yoshioka, Naho Browse this author
Washino, Komei Browse this author
Shinohara, Nobuo Browse this author →KAKEN DB
Tamaki, Nagara Browse this author
Shiga, Tohru Browse this author →KAKEN DB
Keywords: I-131-MIBG
neuroendocrine tumor
Issue Date: 10-May-2021
Publisher: Society of Nuclear Medicine
Journal Title: Journal of nuclear medicine
Volume: 62
Issue: 5
Start Page: 685
End Page: 694
Publisher DOI: 10.2967/jnumed.120.250803
Abstract: I-131-meta-iodobenzylguanidine (I-131-MIBG) radiotherapy has shown some survival benefits in metastatic neuroendocrine tumors (NETs). European Association of Nuclear Medicine clinical guidelines for I-131-MIBG radiotherapy suggest a repeated treatment protocol, although none currently exists. The existing single-high-dose I-131-MIBG radiotherapy (444 MBq/kg) has been shown to have some benefits for patients with metastatic NETs. However, this protocol increases adverse effects and requires alternative therapeutic approaches. Therefore, the aim of this study was to evaluate the effects of repeated I-131-MIBG therapy on tumor size and tumor metabolic response in patients with metastatic NETs. Methods: Eleven patients with metastatic NETs (aged 49.2 +/- 16.3 y) prospectively received repeated 5,550-MBq doses of I-131-MIBG therapy at 6-mo intervals. In total, 31 treatments were performed. The mean number of treatments was 2.8 0.4, and the cumulative I-131-MIBG dose was 15,640.9 + 2,245.1 MBq (286.01 MBq/kg). Tumor response was observed by CT and 18F-FDG PET or by F-18-FDG PET/CT before and 3-6 mo after the final I-131-MIBG treatment. Results: On the basis of the CT findings with RECIST, 3 pa tients showed a partial response and 6 patients showed stable disease. The remaining 2 patients showed progressive disease. Al though there were 2 progressive-disease patients, analysis of all patients showed no increase in summed length diameter (median, 228.7 mm [interquartile range (10R), 37.0-336.0 mm] to 171.0 mm [IQR, 38.0-270.0 mm]; P = 0.563). In tumor region-based analysis with par tial-response and stable-disease patients (n = 9), I-131-MIBG therapy significantly reduced tumor diameter (79 lesions; median, 16 mm [IQR, 12-22 mm] to 11 mm [10R, 6-16 mm]; P < 0.001). Among 5 patients with hypertension, there was a strong trend toward systolic blood pressure reduction (P = 0.058), and diastolic blood pressure was significantly reduced (P = 0.006). Conclusion: Eighty-two percent of metastatic NET patients effectively achieved inhibition of disease progression, with reduced tumor size and reduced metabolic activity, through repeated I-131-MIBG therapy. Therefore, this relatively short-term repeated I-131-MIBG treatment may have potential as one option in the therapeutic protocol for metastatic NETs. Larger prospective studies with control groups are warranted.
Type: article
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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