Abstract:
PURPOSE:Paired imaging/therapy with radiolabeled somatostatin receptor (SSTR) antagonists is a novel approach in neuroendocrine tumors (NETs). The aim of this study was to compare tumor uptake of 68Ga-DOTA-JR11 and 177Lu-satoreotide tetraxetan (177Lu-DOTA-JR11) in patients with NETs. METHODS:As part of a prospective clinical trial, 20 patients with metastatic NETs underwent 68Ga-DOTA-JR11 PET/CT and serial imaging with 177Lu-satoreotide tetraxetan. PET/CT and SPECT/CT parameters for lesion uptake and absorbed dose of 177Lu-satoreotide tetraxetan in lesions were compared using linear regression analysis and Pearson correlation. RESULTS:A total of 95 lesions were analyzed on 68Ga-DOTA-JR11 PET/CT and 177Lu-satoreotide tetraxetan SPECT/CT. SUVs and tumor-to-normal-tissue ratios on PET/CT and SPECT/CT were significantly correlated (p < 0.01), but the degree of correlation was modest with Pearson correlation coefficients ranging from 0.3 to 0.7. Variation in intrapatient lesional correlation was observed. Nevertheless, in all patients, the lesion SUVpeak uptake ratio for 177Lu-satoreotide tetraxetan vs. 68Ga-DOTA-JR11 was high; even in those with low uptake on 68Ga-DOTA-JR11 PET/CT (SUVpeak ≤ 10), a ratio of 8.0 ± 5.2 was noted. Correlation of SUVpeak of 68Ga-DOTA-JR11 with projected 177Lu-satoreotide tetratexan-absorbed dose (n = 42) was modest (r = 0.5, p < 0.01), while excellent correlation of SUVpeak of 177Lu-satoreotide tetraxetan with projected 177Lu-satoreotide tetraxetan-absorbed dose was noted (r = 0.9, p < 0.0001). CONCLUSION:Our study shows that 68Ga-DOTA-JR11 PET can be used for patient selection and PRRT and that low tumor uptake on PET should not preclude patients from treatment with 177Lu-satoreotide tetraxetan. The ability to use single time-point SPECT/CT for absorbed dose calculations could facilitate dosimetry regimens, save costs, and improve patient convenience.
journal_name
Eur J Nucl Med Mol Imagingauthors
Krebs S,O'Donoghue JA,Biegel E,Beattie BJ,Reidy D,Lyashchenko SK,Lewis JS,Bodei L,Weber WA,Pandit-Taskar Ndoi
10.1007/s00259-020-04832-9subject
Has Abstractpub_date
2020-12-01 00:00:00pages
3047-3057issue
13eissn
1619-7070issn
1619-7089pii
10.1007/s00259-020-04832-9journal_volume
47pub_type
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