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PET/CT studies of multiple myeloma using 18 F-FDG and 18 F-NaF: comparison of distribution patterns and tracers’ pharmacokinetics

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Abstract

Objective

The aim of this prospective study is to evaluate the combined use of fluorine-18 fluorodeoxyglucose (18 F-FDG) and fluorine-18 sodium fluoride (18 F-NaF) PET/CT in the skeletal assessment of patients with multiple myeloma (MM) and to compare the efficacy of these two PET tracers regarding detection of myeloma-indicative osseous lesions.

Patients and methods

The study includes 60 patients with multiple myeloma (MM) diagnosed according to standard criteria. All patients underwent dynamic (dPET/CT) scanning of the pelvis as well as whole body PET/CT studies with both tracers. The interval between the two exams was one day. Sites of focal increased 18 F-FDG uptake were considered as highly suspicious of myelomatous involvement. The lesions detected on the 18 F-NaF PET/CT scans were then correlated with those detected on 18 F-FDG PET/CT, which served as a reference. Moreover, the 18 F-FDG PET/CT results were also correlated with the low-dose CT findings. The evaluation of dPET/CT studies was based on qualitative evaluation, SUV calculation, and quantitative analysis based on a 2-tissue compartment model and a non-compartmental approach.

Results

Whole body 18 F-FDG PET/CT revealed approximately 343 focal lesions while 18 F-NaF PET/CT revealed 135 MM-indicative lesions (39 % correlation). CT demonstrated 150 lesions that correlated with those in 18 F-FDG PET/CT (44 % correlation). Six patients demonstrated a diffuse pattern of disease with 18 F-FDG, while 15 of them had a mixed (diffuse and focal) pattern of skeletal 18 F-FDG uptake. A high number of degenerative, traumatic and arthritic disease lesions were detected with 18 F-NaF PET/CT. In three patients with multiple focal 18 F-FDG-uptake, 18 F-NaF PET/CT failed to demonstrate any bone lesion. The dPET/CT scanning of the pelvic area with 18 F-FDG and 18 F-NaF revealed 77 and 24 MM-indicative lesions, respectively. Kinetic analysis of 18 F-FDG revealed the following mean values: SUVaver = 5.1, k1 = 0.37 (1/min), k3 = 0.10 (1/min), VB = 0.06, influx = 0.04 (1/min), FD = 1.28; the respective values for 18 F-NaF were SUVaverage = 10.7, k1 = 0.25 (1/min), k3 = 0.34 (1/min), VB = 0.02, influx = 0.10 (1/min), FD = 1.37. Apart from the correlation between VB of 18 F-FDG and k1 of 18 F-NaF (r = 0.54), no other significant correlation was observed between the two tracers’ kinetic parameters. We found a significant correlation between FD and SUVaverage (r = 0.93), FD and SUVmax (r = 0.80), FD and influx ( r = 0.85), as well as between influx and SUVaverage (r = 0.74) for 18 F-FDG. In 18 F-NaF we observed the most significant correlations between FD and SUVaverage (r = 0.97), FD and SUVmax (r = 0.87), and between influx and k1 (r = 0.72).

Conclusion

The combined use of 18 F-FDG PET/CT and 18 F-NaF PET/CT provides different molecular information regarding the biological processes that take place in a MM osseous lesion. 18 F-FDG PET/CT proved to be a more specific biomarker than 18 F-NaF PET/CT in multiple myeloma skeletal assessment.

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Acknowledgements

This study is part of the Sonderforschungsbereich-Transregio 79 (SFB-TRR 79) and was financially supported by the Deutsche Forschungsgemeinschaft (German Research Foundation, DFG).

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The authors declare that they have no conflict of interest.

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Correspondence to Christos Sachpekidis.

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Sachpekidis, C., Goldschmidt, H., Hose, D. et al. PET/CT studies of multiple myeloma using 18 F-FDG and 18 F-NaF: comparison of distribution patterns and tracers’ pharmacokinetics. Eur J Nucl Med Mol Imaging 41, 1343–1353 (2014). https://doi.org/10.1007/s00259-014-2721-y

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  • DOI: https://doi.org/10.1007/s00259-014-2721-y

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