Abstract
Purpose
We sought to assess the performance of 68 Ga-FAPI-04 PET/MR for the diagnosis of primary tumours as well as metastatic lesions in patients with pancreatic cancer and to compare the results with those of 18F-FDG PET/CT.
Methods
Prospectively, we evaluated 33 patients suspected to have pancreatic adenocarcinoma, of whom thirty-two were confirmed by histopathology, and one had autoimmune pancreatitis confirmed by needle biopsy and glucocorticoid treatment. Within 1 week, each patient underwent both 68 Ga-FAPI-04 PET/MR and 18F-FDG PET/CT. Comparisons of the detection abilities for primary tumours, lymph nodes, and metastases were conducted for the two imaging approaches. The original maximum standard uptake values (SUVmax) and normalised SUVmax (SUVmax/SUVbkgd) of paired lesions on 68 Ga-FAPI-04 PET/MR and 18F-FDG PET/CT were measured and compared.
Results
Thirty pancreatic cancer patients and three pancreatitis patients were enrolled. 68 Ga-FAPI-04 PET/MR and 18F-FDG PET/CT exhibited equivalent (100%) detection rates for primary tumours. The original/normalised SUVmax of primary tumours on 68 Ga-FAPI-04 PET was markedly higher than that on 18F-FDG (p < 0.05). Sixteen pancreatic cancer patients had pancreatic parenchymal uptake, whereas 18F-FDG PET images showed parenchymal uptake in only four patients (53.33% vs. 13.33%, p < 0.001). 68 Ga-FAPI-04 PET detected more positive lymph nodes than 18F-FDG PET (42 vs. 30, p < 0.001), while 18F-FDG PET was able to detect more liver metastases than 68 Ga-FAPI-04 (181 vs. 104, p < 0.001). In addition, multisequence MR imaging helped explain ten pancreatic cancers that could not be definitively revealed due to 68 Ga-FAPI-04 inflammatory uptake and identified more liver metastases than 18F-FDG (256 vs. 181, p < 0.001).
Conclusion
68 Ga-FAPI-04 PET might be better than 18F-FDG PET in the detection of suspicious lymph node metastases. MR multiple sequence imaging of 68 Ga-FAPI-04 PET/MR was helpful for explaining pancreatic lesions in patients with obstructive inflammation and detecting tiny liver metastases.
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Funding
We gratefully acknowledge the financial support of the National Natural Science Foundation of China (Grant Nos. 82001867 and 81871390) and the “234 Discipline Climbing Plan” of the First Affiliated Hospital of Naval Medical University (Grant Nos. 2019YPT002 and 2020YPT002).
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Zeyu Zhang, Guorong Jia, Chao Cheng, and Changjing Zuo designed the study, interpreted the data, and led the writing and review of the manuscript. Kai Cao, Guixia Pan, Lu Zhang, and Tao Wang synthesised 68 Ga-FAPI-04 and performed the examination. Chao Cheng, Changjing Zuo, Zeyu Zhang, Guorong Jia, Qinqin Yang, Hongyu Meng, and Jian Yang collected clinical and imaging data. Chao Cheng and Changjing Zuo participated in the review of the manuscript.
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This article does not contain any studies with animals. All procedures of this study followed the principles of the Declaration of Helsinki. This prospective study was approved by the Ethics Committee of the First Affiliated Hospital of Naval Medical University (Changhai Hospital, CHEC2020-071).
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259_2022_5729_MOESM1_ESM.tif
Supplementary Fig. 1 Radiographic follow-up date of 4 patients with abnormal 18F-FDG uptake in pancreas parenchyma.(a)A 61-year-old man (Patient 6) with pancreatic head cancer. 18F-FDG PET/CT showed diffuse increased 18F-FDG uptake in the pancreatic parenchyma of the body and tail. Radiographic follow-up 5 months later showed the peripancreatic inflammation and inflammatory exudation, and no abnormal lesions were found in pancreatic parenchyma. (b) A 65-year-old woman (Patient 10) with pancreatic body cancer. 18F-FDG PET/CT showed focal increased uptake of 18F-FDG in the pancreatic tail parenchyma. Radiographic follow-up 8 months later showed no significant lesions in the tail of the pancreas. (c) A 66-year-old man (Patient 28) with pancreatic head cancer. 18F-FDG PET/CT showed diffuse increased 18F-FDG uptake in the pancreatic parenchyma of the body and tail. Radiographic follow-up 4 months later showed dilation of the pancreatic duct in the body andtail, and no obvious lesions in the pancreatic parenchyma. (d) A 72-year-old man (Patient 30) with pancreatic body cancer.18F-FDG PET/CT showed atrophied pancreatic parenchymal in the body and tail with diffuse increased 18F-FDG uptake. Radiographic follow-up 3 months later showed no significant lesions inthe body and tail of the pancreas. (TIF 52555 KB)
259_2022_5729_MOESM2_ESM.tif
Supplementary Fig. 2 MIP images of 68Ga-FAPI-04 PET and 18F-FDG PET in patients with multiple hepatic metastases (patients 8, 9, 29 and 30) (TIF 41013 KB)
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Zhang, Z., Jia, G., Pan, G. et al. Comparison of the diagnostic efficacy of 68 Ga-FAPI-04 PET/MR and 18F-FDG PET/CT in patients with pancreatic cancer. Eur J Nucl Med Mol Imaging 49, 2877–2888 (2022). https://doi.org/10.1007/s00259-022-05729-5
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DOI: https://doi.org/10.1007/s00259-022-05729-5