Abstract
Neuroendocrine tumors (NETs) can be visualized using radiolabeled somatostatin analogs. We have previously shown the clinical potential of 64Cu-DOTATATE in a small first-in-human feasibility study. The aim of the present study was, in a larger prospective design, to compare on a head-to-head basis the performance of 64Cu-DOTATATE and 111In-diethylenetriaminepentaacetic acid (DTPA)-octreotide (111In-DTPA-OC) as a basis for implementing 64Cu-DOTATATE as a routine. Methods: We prospectively enrolled 112 patients with pathologically confirmed NETs of gastroenteropancreatic or pulmonary origin. All patients underwent both PET/CT with 64Cu-DOTATATE and SPECT/CT with 111In-DTPA-OC within 60 d. PET scans were acquired 1 h after injection of 202 MBq (range, 183-232 MBq) of 64Cu-DOTATATE after a diagnostic contrast-enhanced CT scan. Patients were followed for 42-60 mo for evaluation of discrepant imaging findings. The McNemar test was used to compare the diagnostic performance. Results: Eightyseven patients were congruently PET-and SPECT-positive. No SPECT-positive cases were PET-negative, whereas 10 false-negative SPECT cases were identified using PET. The diagnostic sensitivity and accuracy of 64Cu-DOTATATE (97% for both) were significantly better than those of 111In-DTPA-OC (87% and 88%, respectively, P 5 0.017). In 84 patients (75%), 64Cu-DOTATATE identified more lesions than 111In-DTPA-OC and always at least as many. In total, twice as many lesions were detected with 64Cu-DOTATATE than with 111In-DTPA-OC. Moreover, in 40 of 112 cases (36%) lesions were detected by 64Cu-DOTATATE in organs not identified as disease-involved by 111In-DTPA-OC. Conclusion: With these results, we demonstrate that 64Cu-DOTATATE is far superior to 111In-DTPAOC in diagnostic performance in NET patients. Therefore, we do not hesitate to recommend implementation of 64Cu-DOTATATE as a replacement for 111In-DTPA-OC.
Original language | English |
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Journal | Journal of Nuclear Medicine |
Volume | 56 |
Issue number | 6 |
Pages (from-to) | 847-54 |
Number of pages | 8 |
ISSN | 0161-5505 |
DOIs | |
Publication status | Published - 1 Jun 2015 |
Keywords
- Adult
- Aged
- Aged, 80 and over
- Biopsy
- Female
- Humans
- Image Processing, Computer-Assisted
- Male
- Middle Aged
- Multimodal Imaging
- Neoplasm Metastasis
- Neuroendocrine Tumors
- Octreotide
- Organometallic Compounds
- Pentetic Acid
- Positron-Emission Tomography
- Prospective Studies
- Receptors, Somatostatin
- Stomach Neoplasms
- Tomography, Emission-Computed, Single-Photon
- Tomography, X-Ray Computed