Abstract
Purpose
We aimed to compare the staging efficiency of [68Ga]Ga-DOTATATE and [68Ga]Ga-FAPI PET/CT in nasopharyngeal carcinoma (NPC) patients.
Methods
Thirty-nine patients with pathologically confirmed NPC were enrolled in this prospective study. Each patient underwent paired [68Ga]Ga-DOTATATE and [68Ga]Ga-FAPI PET/CT on 2 successive days. The accuracy of two PET/CT for assessing T, N, and M stages was compared by using head-and-neck MRI, histopathologic diagnosis and follow-up results as reference standards. The radiotracer uptake derived from two PETs was also compared.
Results
For treatment-naïve patients, [68Ga]Ga-DOTATATE PET/CT showed identical sensitivity for the primary tumours but clearer tumor delineation induced by higher tumour-to-background (TBR) ratio (19.1 ± 8.7 vs. 12.4 ± 7.7, P = 0.003), compared with [68Ga]Ga-FAPI PET/CT. Regarding cervical lymph node (CLN) metastases, [68Ga]Ga-DOTATATE PET had significantly better sensitivity and accuracy based on neck sides (98% vs. 82%, P < 0.001; 99% vs. 88% P = 0.008), neck levels (98% vs. 78%, 99% vs. 97%; both P < 0.001) and individual nodes (89% vs. 56%, 91% vs. 76%; both P < 0.001), and higher TBR (8.1 ± 4.1 vs. 6.3 ± 3.7, P < 0.001). Additionally, [68Ga]Ga-DOTATATE PET/CT revealed higher sensitivity and accuracy for distant metastases (96% vs. 53%, 95% vs. 52%; both P < 0.001), particularly in bone metastases (99% vs. 49%, 97% vs. 49%; both P < 0.001). For post-treatment patients, [68Ga]Ga-DOTATATE PET/CT identified one more true-negative case than [68Ga]Ga-FAPI PET/CT.
Conclusion
[68Ga]Ga-DOTATATE PET/CT performed better than [68Ga]Ga-FAPI PET/CT in visualizing the primary tumours, detecting the metastatic lesions and identifying the local recurrence, suggesting [68Ga]Ga-DOTATATE PET/CT may be superior to [68Ga]Ga-FAPI PET/CT for NPC staging.
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Funding
This study was supported in part by the Joint Funds for the Innovation of Science and Technology Fujian Province (No.2021Y9134), Natural Science Foundation of Fujian Province (No.2023J01564) and the Fujian Provincial Health Technology Project (No.2022QNA032).
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Experimental design: Jieling Zheng and Weibing Miao; Patients recruiting: Jieling Zheng, Li Su, Wenlong Lv, Chunlin Ke, Peirong Wang, Xiaohui Liu, Feng Liu; Radiopharmaceutical preparation: Yun Yang; PET imaging analyses: Jieling Zheng and Weibing Miao; Immunohistochemistry analysis: Qian Ru and Li Zhang; Statistical analyses: Jieling Zheng and Guochang Wang; Manuscript writing: Jieling Zheng; Manuscript revision: Guochang Wang and Weibing Miao. All authors have seen and approved the manuscript.
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Zheng, J., Wang, G., Ru, Q. et al. A head-to-head comparison of [68Ga]Ga-DOTATATE and [68Ga]Ga-FAPI PET/CT in patients with nasopharyngeal carcinoma: a single-center, prospective study. Eur J Nucl Med Mol Imaging (2024). https://doi.org/10.1007/s00259-024-06744-4
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DOI: https://doi.org/10.1007/s00259-024-06744-4