PURPOSE: Selection of candidates for peptide receptor radionuclide therapy (PRRT) is increasingly based on receptor positron emission tomography (PET) imaging, including the common tracer 68Ga DOTATOC. However, no studies have yet compared standardized uptake values (SUVs) and absorbed doses in this field. MATERIALS AND METHODS: We retrospectively analyzed a consecutive cohort of 21 patients with 61 evaluable tumor lesions undergoing both pretherapeutic 68Ga DOTATOC-PET/CT (Biograph Duo [Siemens Medical Solutions, Erlangen, Germany]; PET acquisition, 75.3 ± 15.4 minutes postinjection; 117.3 ± 33.9 MBq 68Ga DOTATOC) and PRRT with Lu octreotate (7.47 ± 1.39 GBq; intratherapeutic tumor dosimetry with serial whole-body scans; 1, 2, and 4 days postinjection) at our institution. SUVs were compared with the tumor-absorbed doses per injected activity (D/A0) of the subsequent first treatment cycle. RESULTS: The correlation of SUV and D/A0 was r = 0.72 (SUVmean) and r = 0.71 (SUVmax), both P < 0.001. Pancreatic origin and hepatic localization were associated with higher D/A0, and chromogranin A level and Ki-67 index had no influence on SUV or D/A0. High-SUV lesions (SUVmean >15; SUVmax >25) resulted in high D/A0 (>10 Gy/GBq) in 66.7% to 70.8% and low D/A0 (<5 Gy/GBq) in only 8.3% to 12.5% on subsequent PRRT. The mentioned low D/A0 range, on the other hand, was achieved by all lesions with SUVmean <7 or SUVmax <9. CONCLUSIONS: Somatostatin receptor PET imaging may predict tumor-absorbed doses. The ability to indicate insufficient target irradiation by a low SUV could aid in selection of appropriate candidates for PRRT. However, larger series are needed to confirm and validate these initial findings.
PURPOSE: Selection of candidates for peptide receptor radionuclide therapy (PRRT) is increasingly based on receptor positron emission tomography (PET) imaging, including the common tracer 68Ga DOTATOC. However, no studies have yet compared standardized uptake values (SUVs) and absorbed doses in this field. MATERIALS AND METHODS: We retrospectively analyzed a consecutive cohort of 21 patients with 61 evaluable tumor lesions undergoing both pretherapeutic 68Ga DOTATOC-PET/CT (Biograph Duo [Siemens Medical Solutions, Erlangen, Germany]; PET acquisition, 75.3 ± 15.4 minutes postinjection; 117.3 ± 33.9 MBq 68Ga DOTATOC) and PRRT with Lu octreotate (7.47 ± 1.39 GBq; intratherapeutic tumor dosimetry with serial whole-body scans; 1, 2, and 4 days postinjection) at our institution. SUVs were compared with the tumor-absorbed doses per injected activity (D/A0) of the subsequent first treatment cycle. RESULTS: The correlation of SUV and D/A0 was r = 0.72 (SUVmean) and r = 0.71 (SUVmax), both P < 0.001. Pancreatic origin and hepatic localization were associated with higher D/A0, and chromogranin A level and Ki-67 index had no influence on SUV or D/A0. High-SUV lesions (SUVmean >15; SUVmax >25) resulted in high D/A0 (>10 Gy/GBq) in 66.7% to 70.8% and low D/A0 (<5 Gy/GBq) in only 8.3% to 12.5% on subsequent PRRT. The mentioned low D/A0 range, on the other hand, was achieved by all lesions with SUVmean <7 or SUVmax <9. CONCLUSIONS: Somatostatin receptor PET imaging may predict tumor-absorbed doses. The ability to indicate insufficient target irradiation by a low SUV could aid in selection of appropriate candidates for PRRT. However, larger series are needed to confirm and validate these initial findings.
Authors: L Bodei; M Kidd; I M Modlin; V Prasad; S Severi; V Ambrosini; D J Kwekkeboom; E P Krenning; R P Baum; G Paganelli; I Drozdov Journal: Eur J Nucl Med Mol Imaging Date: 2015-05-07 Impact factor: 9.236
Authors: Ka Kit Wong; Kirk A Frey; Jeremy Niedbala; Ravi K Kaza; Francis P Worden; Kellen J Fitzpatrick; Yuni K Dewaraja Journal: Nucl Med Commun Date: 2022-06-10 Impact factor: 1.698
Authors: Lisa Bodei; Mark S Kidd; Aviral Singh; Wouter A van der Zwan; Stefano Severi; Ignat A Drozdov; Anna Malczewska; Richard P Baum; Dik J Kwekkeboom; Giovanni Paganelli; Eric P Krenning; Irvin M Modlin Journal: Eur J Nucl Med Mol Imaging Date: 2019-12-14 Impact factor: 9.236
Authors: Simone Krebs; Joseph A O'Donoghue; Evan Biegel; Bradley J Beattie; Diane Reidy; Serge K Lyashchenko; Jason S Lewis; Lisa Bodei; Wolfgang A Weber; Neeta Pandit-Taskar Journal: Eur J Nucl Med Mol Imaging Date: 2020-05-06 Impact factor: 9.236
Authors: C Schraml; N F Schwenzer; O Sperling; P Aschoff; M P Lichy; M Müller; C Brendle; M K Werner; C D Claussen; C Pfannenberg Journal: Cancer Imaging Date: 2013-03-05 Impact factor: 3.909