RT Journal Article
SR Electronic
T1 Functional Imaging of Neuroendocrine Tumors: A Head-to-Head Comparison of Somatostatin Receptor Scintigraphy, <sup>123</sup>I-MIBG Scintigraphy, and <sup>18</sup>F-FDG PET
JF Journal of Nuclear Medicine
JO J Nucl Med
FD Society of Nuclear Medicine
SP 704
OP 712
DO 10.2967/jnumed.109.069765
VO 51
IS 5
A1 Binderup, Tina
A1 Knigge, Ulrich
A1 Loft, Annika
A1 Mortensen, Jann
A1 Pfeifer, Andreas
A1 Federspiel, Birgitte
A1 Hansen, Carsten Palnaes
A1 Højgaard, Liselotte
A1 Kjaer, Andreas
YR 2010
UL http://jnm.snmjournals.org/content/51/5/704.abstract
AB Functional techniques are playing a pivotal role in the imaging of cancer today. Our aim was to compare, on a head-to-head basis, 3 functional imaging techniques in patients with histologically verified neuroendocrine tumors: somatostatin receptor scintigraphy (SRS) with 111In-diethylenetriaminepentaacetic acid-octreotide, scintigraphy with 123I-metaiodobenzylguanidine (MIBG), and 18F-FDG PET. Methods: Ninety-six prospectively enrolled patients with neuroendocrine tumors underwent SRS, 123I-MIBG scintigraphy, and 18F-FDG PET on average within 40 d. The functional images were fused with low-dose CT scans for anatomic localization, and the imaging results were compared with the proliferation index as determined by Ki67. Results: The overall sensitivity of SRS, 123I-MIBG scintigraphy, and 18F-FDG PET was 89%, 52%, and 58%, respectively. Of the 11 SRS-negative patients, 7 were 18F-FDG PET-positive, of which 3 were also 123I-MIBG scintigraphy–positive, giving a combined overall sensitivity of 96%. SRS also exceeded 123I-MIBG scintigraphy and 18F-FDG PET based on the number of lesions detected (393, 185, and 225, respectively) and tumor subtypes. 123I-MIBG scintigraphy was superior to 18F-FDG PET for ileal neuroendocrine tumors, and 18F-FDG PET was superior to 123I-MIBG scintigraphy for pancreaticoduodenal neuroendocrine tumors. The sensitivity of 18F-FDG PET (92%) exceeded that of both SRS (69%) and 123I-MIBG scintigraphy (46%) for tumors with a proliferation index above 15%. Conclusion: The overall sensitivity of 123I-MIBG scintigraphy and 18F-FDG PET was low compared with SRS. However, for tumors with a high proliferation rate, 18F-FDG PET had the highest sensitivity. The results indicate that, although SRS should still be the routine method, 18F-FDG PET provides complementary diagnostic information and is of value for neuroendocrine tumor patients with negative SRS findings or a high proliferation index.