Abstract
Purpose
This study investigates the prognostic value of 68Ga-Pentixafor PET/CT using PET-derived quantitative in multiple myeloma (MM) patients with suspected recurrence in comparison to 18F-FDG PET/CT and clinical data.
Methods
Twenty-four MM patients with suspicion for relapse who underwent 68Ga-Pentixafor and 18F-FDG PET/CT were retrospectively evaluated. Total bone marrow glycolysis for 18F-FDG (TBMFDG) and total bone marrow uptake for 68Ga-Pentixafor PET/CT (TBMCXCR4) were calculated using whole-body metabolic tumor burden obtained by dedicated software (MIM 7.0.6). The patients were followed for 19–24 months, and the association of PET-derived quantitative data with overall survival (OS) was analyzed.
Results
68Ga-Pentixafor PET/CT was positive in 17 patients, of which 13 were also positive on 18F-FDG PET/CT, whereas 7 patients were negative on both scans. The positive rate of 68Ga-Pentixafor and 18F-FDG PET/CT on a patient-based approach was 70.8% and 54.1%, respectively. 68Ga-Pentixafor positivity was significantly associated with OS (p = 0.009), and 18F-FDG positivity was at the margin of statistical significance (p = 0.056). TBMCXCR4 and TBMFDG were negatively correlated with OS (r = −0.457, p = 0.025 and r = −0.617, p = 0.001, respectively). The OS was negatively correlated with beta-2-microglobulin levels (r = −0.511, p = 0.01) and CRAB score (r = −0.592, p = 0.002) as an indicator of the end-organ disease, which confirmed these results. Serum beta-2-microglobulin levels and CRAB score were also correlated with TBMCXCR4 (r = 0.442, p = 0.039 and r = 0.573, p = 0.003, respectively) and TBMFDG (r = 0.543, p = 0.009 and r = -0.424, p = 0.003, respectively).
Conclusion
68Ga-Pentixafor PET/CT positivity is a negative prognostic factor in the survival outcome of MM patients. Complementary 68Ga-Pentixafor PET/CT has the potential to overcome 18F-FDG PET/CT limitations and helps a more precise risk stratification.
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Acknowledgements
The authors thank Prof. Dr. Hans-Jürgen Wester for his support. The authors thank Istanbul Development Agency for their support in the theranostic research infrastructure of our department and radiopharmacy laboratory
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The authors disclose that they did not receive any personal or financial support for this study.
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Supplementary Fig. 1 18F-FDG and 68Ga-Pentixafor-PET maximum intensity projection images showing tumor burden of patient #24 obtained using dedicated software (MIM 7.0.6 Lesion ID) for segmentation (PNG 455 KB)
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Kuyumcu, S., Isik, E.G., Tiryaki, T.O. et al. Prognostic significance of 68Ga-Pentixafor PET/CT in multiple myeloma recurrence: a comparison to 18F-FDG PET/CT and laboratory results. Ann Nucl Med 35, 1147–1156 (2021). https://doi.org/10.1007/s12149-021-01652-1
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DOI: https://doi.org/10.1007/s12149-021-01652-1