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Röhrich M, Daum J, Gutjahr E, Spektor AM, Glatting FM, Sahin YA, Buchholz HG, Hoppner J, Schroeter C, Mavriopoulou E, Schlamp K, Grott M, Eichhorn F, Heußel CP, Kauczor HU, Kreuter M, Giesel F, Schreckenberger M, Winter H, Haberkorn U. Diagnostic Potential of Supplemental Static and Dynamic 68Ga-FAPI-46 PET for Primary 18F-FDG-Negative Pulmonary Lesions. J Nucl Med 2024:jnumed.123.267103. [PMID: 38604763 DOI: 10.2967/jnumed.123.267103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 02/20/2024] [Indexed: 04/13/2024] Open
Abstract
PET using 68Ga-labeled fibroblast activation protein (FAP) inhibitors (FAPIs) holds high potential for diagnostic imaging of various malignancies, including lung cancer (LC). However, 18F-FDG PET is still the clinical gold standard for LC imaging. Several subtypes of LC, especially lepidic LC, are frequently 18F-FDG PET-negative, which markedly hampers the assessment of single pulmonary lesions suggestive of LC. Here, we evaluated the diagnostic potential of static and dynamic 68Ga-FAPI-46 PET in the 18F-FDG-negative pulmonary lesions of 19 patients who underwent surgery or biopsy for histologic diagnosis after PET imaging. For target validation, FAP expression in lepidic LC was confirmed by FAP immunohistochemistry. Methods: Hematoxylin and eosin staining and FAP immunohistochemistry of 24 tissue sections of lepidic LC from the local tissue bank were performed and analyzed visually. Clinically, 19 patients underwent static and dynamic 68Ga-FAPI-46 PET in addition to 18F-FDG PET based on individual clinical indications. Static PET data of both examinations were analyzed by determining SUVmax, SUVmean, and tumor-to-background ratio (TBR) against the blood pool, as well as relative parameters (68Ga-FAPI-46 in relation to18F-FDG), of histologically confirmed LC and benign lesions. Time-activity curves and dynamic parameters (time to peak, slope, k 1, k 2, k 3, and k 4) were extracted from dynamic 68Ga-FAPI-46 PET data. The sensitivity and specificity of all parameters were analyzed by calculating receiver-operating-characteristic curves. Results: FAP immunohistochemistry confirmed the presence of strongly FAP-positive cancer-associated fibroblasts in lepidic LC. LC showed markedly elevated 68Ga-FAPI-46 uptake, higher TBRs, and higher 68Ga-FAPI-46-to-18F-FDG ratios for all parameters than did benign pulmonary lesions. Dynamic imaging analysis revealed differential time-activity curves for LC and benign pulmonary lesions: initially increasing time-activity curves with a decent slope were typical of LC, and steadily decreasing time-activity curve indicated benign pulmonary lesions, as was reflected by a significantly increased time to peak and significantly smaller absolute values of the slope for LC. Relative 68Ga-FAPI-46-to-18F-FDG ratios regarding SUVmax and TBR showed the highest sensitivity and specificity for the discrimination of LC from benign pulmonary lesions. Conclusion: 68Ga-FAPI-46 PET is a powerful new tool for the assessment of single 18F-FDG-negative pulmonary lesions and may optimize patient stratification in this clinical setting.
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Affiliation(s)
- Manuel Röhrich
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;
- Department of Nuclear Medicine, University Hospital Mainz, Mainz, Germany
- German Center of Lung Research, Heidelberg, Germany
| | - Johanna Daum
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
- German Center of Lung Research, Heidelberg, Germany
| | - Ewgenija Gutjahr
- Institute of Pathology, University Hospital Heidelberg, Heidelberg, Germany
| | - Anna-Maria Spektor
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
- German Center of Lung Research, Heidelberg, Germany
| | - Frederik M Glatting
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
- Clinical Cooperation Unit Molecular and Radiation Oncology, German Cancer Research Center, Heidelberg, Germany
- Department of Radiation Oncology, University Hospital Heidelberg, Heidelberg, Germany
| | | | | | - Jorge Hoppner
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
- German Center of Lung Research, Heidelberg, Germany
| | - Cathrin Schroeter
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
- German Center of Lung Research, Heidelberg, Germany
| | - Eleni Mavriopoulou
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
- German Center of Lung Research, Heidelberg, Germany
| | - Kai Schlamp
- German Center of Lung Research, Heidelberg, Germany
- Department of Radiology, Thoraxklinik, University Hospital Heidelberg, Heidelberg, Germany
| | - Matthias Grott
- German Center of Lung Research, Heidelberg, Germany
- Department of Thoracic Surgery, Thoraxklinik, University Hospital Heidelberg, Heidelberg, Germany
| | - Florian Eichhorn
- German Center of Lung Research, Heidelberg, Germany
- Department of Thoracic Surgery, Thoraxklinik, University Hospital Heidelberg, Heidelberg, Germany
| | - Claus Peter Heußel
- German Center of Lung Research, Heidelberg, Germany
- Department of Radiology, Thoraxklinik, University Hospital Heidelberg, Heidelberg, Germany
| | - Hans Ulrich Kauczor
- German Center of Lung Research, Heidelberg, Germany
- Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany
- Center for Interstitial and Rare Lung Diseases, Pneumology, and Respiratory Critical Care Medicine, Thoraxklinik, University of Heidelberg, Heidelberg, Germany
| | - Michael Kreuter
- Department of Pneumology, Mainz Center for Pulmonary Medicine, Mainz University, Mainz, Germany
- Medical Center and Department of Pulmonary, Critical Care, and Sleep Medicine, Marienhaus Clinic Mainz, Mainz, Germany
| | - Frederik Giesel
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
- German Center of Lung Research, Heidelberg, Germany
- Department of Nuclear Medicine, Medical Faculty, University Hospital Düsseldorf, Heinrich Heine University, Düsseldorf, Germany
- Institute for Radiation Sciences, Osaka University, Osaka, Japan
- German Cancer Consortium, Heidelberg, Germany; and
| | | | - Hauke Winter
- German Center of Lung Research, Heidelberg, Germany
- Department of Radiology, Thoraxklinik, University Hospital Heidelberg, Heidelberg, Germany
| | - Uwe Haberkorn
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
- German Center of Lung Research, Heidelberg, Germany
- Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany
- Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, Heidelberg, Germany
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2
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Spektor AM, Gutjahr E, Lang M, Glatting FM, Hackert T, Pausch T, Tjaden C, Schreckenberger M, Haberkorn U, Röhrich M. Immunohistochemical FAP Expression Reflects 68Ga-FAPI PET Imaging Properties of Low- and High-Grade Intraductal Papillary Mucinous Neoplasms and Pancreatic Ductal Adenocarcinoma. J Nucl Med 2024; 65:52-58. [PMID: 38167622 PMCID: PMC10755523 DOI: 10.2967/jnumed.123.266393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 10/17/2023] [Indexed: 01/05/2024] Open
Abstract
Pancreatic intraductal papillary mucinous neoplasms (IPMNs) are grossly visible (typically > 5 mm) intraductal epithelial neoplasms of mucin-producing cells, arising in the main pancreatic duct or its branches. According to the current 2-tiered grading scheme, these lesions are categorized as having either low-grade (LG) dysplasia, which has a benign prognosis, or high-grade (HG) dysplasia, which formally represents a carcinoma in situ and thus can transform to pancreatic ductal adenocarcinoma (PDAC). Because both entities require different treatments according to their risk of becoming malignant, a precise pretherapeutic diagnostic differentiation is inevitable for adequate patient management. Recently, our group has demonstrated that 68Ga-fibroblast activation protein (FAP) inhibitor (FAPI) PET/CT shows great potential for the differentiation of LG IPMNs, HG IPMNs, and PDAC according to marked differences in signal intensity and tracer dynamics. The purpose of this study was to biologically validate FAP as a target for PET imaging by analyzing immunohistochemical FAP expression in LG IPMNs, HG IPMNs, and PDAC and comparing with SUV and time to peak (TTP) measured in our prior study. Methods: To evaluate the correlation of the expression level of FAP and α-smooth muscle actin (αSMA) in neoplasm-associated stroma depending on the degree of dysplasia in IPMNs, 98 patients with a diagnosis of LG IPMN, HG IPMN, PDAC with associated HG IPMN, or PDAC who underwent pancreatic surgery at the University Hospital Heidelberg between 2017 and 2023 were identified using the database of the Institute of Pathology, University Hospital Heidelberg. In a reevaluation of hematoxylin- and eosin-stained tissue sections of formalin-fixed and paraffin-embedded resection material from the archive, which was originally generated for histopathologic routine diagnostics, a regrading of IPMNs was performed by a pathologist according to the current 2-tiered grading scheme, consequently eliminating the former diagnosis of "IPMN with intermediate-grade dysplasia." For each case, semithin tissue sections of 3 paraffin blocks containing neoplasm were immunohistologically stained with antibodies directed against FAP and αSMA. In a masked approach, a semiquantitative analysis of the immunohistochemically stained slides was finally performed by a pathologist by adapting the immunoreactive score (IRS) and human epidermal growth factor receptor 2 (Her2)/neu score to determine the intensity and percentage of FAP- and αSMA-positive cells. Afterward, the IRS of 14 patients who underwent 68Ga-FAPI-74 PET/CT in our previous study was compared with their SUVmax, SUVmean, and TTP for result validation. Results: From 98 patients, 294 specimens (3 replicates per patient) were immunohistochemically stained for FAP and αSMA. Twenty-three patients had LG IPMNs, 11 had HG IPMNs, 10 had HG IPMNs plus PDAC, and 54 had PDAC. The tumor stroma was in all cases variably positive for FAP. The staining intensity, percentage of FAP-positive stroma, IRS, and Her2/neu score increased with higher malignancy. αSMA expression could be shown in normal pancreatic stroma as well as within peri- and intraneoplastic desmoplastic reaction. No homogeneous increase in intensity, percentage, IRS, and Her2/neu score with higher malignancy was observed for αSMA. The comparison of the mean IRS of FAP with the mean SUVmax, SUVmean, and TTP of 68Ga-GAPI-74 PET/CT showed a matching value increasing with higher malignancy in 68Ga-FAPI-74 PET imaging and immunohistochemical FAP expression. Conclusion: The immunohistochemical staining of IPMNs and PDAC validates FAP as a biology-based stromal target for in vivo imaging. Increasing expression of FAP in lesions with a higher degree of malignancy matches the expectation of a stronger FAP expression in PDAC and HG IPMNs than in LG IPMNs and corroborates our previous findings of higher SUVs and a longer TTP in PDAC and HG IPMNs than in LG IPMNs.
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Affiliation(s)
- Anna-Maria Spektor
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Ewgenija Gutjahr
- Institute of Pathology, University Hospital Heidelberg, Heidelberg, Germany
| | - Matthias Lang
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Frederik M Glatting
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
- Clinical Cooperation Unit Molecular and Radiation Oncology, German Cancer Research Center, Heidelberg, Germany
| | - Thilo Hackert
- Department of General, Visceral, and Thoracic Surgery, University Hospital Hamburg, Hamburg, Germany
| | - Thomas Pausch
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Christine Tjaden
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | | | - Uwe Haberkorn
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
- Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, Heidelberg, Germany
| | - Manuel Röhrich
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;
- Department of Nuclear Medicine, University Hospital Mainz, Mainz, Germany; and
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3
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Koerber SA, Röhrich M, Walkenbach L, Liermann J, Choyke PL, Fink C, Schroeter C, Spektor AM, Herfarth K, Walle T, Calais J, Kauczor HU, Jaeger D, Debus J, Haberkorn U, Giesel FL. Impact of 68Ga-FAPI PET/CT on Staging and Oncologic Management in a Cohort of 226 Patients with Various Cancers. J Nucl Med 2023; 64:1712-1720. [PMID: 37678928 PMCID: PMC10626373 DOI: 10.2967/jnumed.123.266046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 08/01/2023] [Indexed: 09/09/2023] Open
Abstract
Since the development of fibroblast activation protein-targeted radiopharmaceuticals, 68Ga-fibroblast activation protein inhibitor (FAPI) PET/CT has been found to be suitable for detecting primary and metastatic lesions in many types of tumors. However, there is currently a lack of reliable data regarding the clinical impact of this family of probes. To address this gap, the present study aimed to analyze the clinical impact of 68Ga-FAPI PET/CT by examining a large cohort of patients with various tumors. Methods: In total, 226 patients (137 male and 89 female) were included in this retrospective analysis. Pancreatic cancer and head and neck cancers were the most common tumor types in this cohort. TNM stage and oncologic management were initially determined with gold standard imaging, and these results were compared with 68Ga-FAPI PET/CT. Changes were classified as major and minor. Results: For 42% of all patients, TNM stage was changed by 68Ga-FAPI PET/CT results. Most of these changes resulted in upstaging. A change in clinical management occurred in 117 of 226 patients. Although a major change in management occurred in only 12% of patients, there was a significant improvement in the ability to accurately plan radiation therapy. In general, the highest clinical impact of 68Ga-FAPI PET/CT imaging was found in patients with lung cancer, pancreatic cancer, and head and neck tumors. Conclusion: 68Ga-FAPI PET/CT is a promising imaging probe that has a significant impact on TNM stage and clinical management. 68Ga-FAPI PET/CT promises to be a crucial new technology that will improve on conventional radiologic imaging methods such as contrast-enhanced CT and contrast-enhanced MRI typically acquired for cancer staging.
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Affiliation(s)
- Stefan A Koerber
- Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany
- National Center of Radiation Oncology, Heidelberg Institute of Radiation Oncology, Heidelberg, Germany
- Clinical Cooperation Unit Radiation Oncology, German Cancer Research Center, Heidelberg, Germany
- Department of Radiation Oncology, Barmherzige Brueder Hospital Regensburg, Regensburg, Germany
| | - Manuel Röhrich
- Department of Nuclear Medicine, Heidelberg University Hospital, Heidelberg, Germany;
- Department of Nuclear Medicine, Mainz University Hospital, Mainz, Germany
| | - Leon Walkenbach
- Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany
| | - Jakob Liermann
- Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany
- National Center of Radiation Oncology, Heidelberg Institute of Radiation Oncology, Heidelberg, Germany
| | - Peter L Choyke
- Molecular Imaging Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Christoph Fink
- Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany
- National Center of Radiation Oncology, Heidelberg Institute of Radiation Oncology, Heidelberg, Germany
| | - Cathrin Schroeter
- Department of Nuclear Medicine, Heidelberg University Hospital, Heidelberg, Germany
| | - Anna-Maria Spektor
- Department of Nuclear Medicine, Heidelberg University Hospital, Heidelberg, Germany
| | - Klaus Herfarth
- Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany
- National Center of Radiation Oncology, Heidelberg Institute of Radiation Oncology, Heidelberg, Germany
- Clinical Cooperation Unit Radiation Oncology, German Cancer Research Center, Heidelberg, Germany
| | - Thomas Walle
- Department of Medical Oncology, National Center for Tumor Diseases, Heidelberg University Hospital, Heidelberg, Germany
- Clinical Cooperation Unit Virotherapy, German Cancer Research Center, Heidelberg, Germany
- German Cancer Consortium, Heidelberg, Germany
| | - Jeremie Calais
- Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, California
| | - Hans-Ulrich Kauczor
- Department of Diagnostic and Interventional Radiology, Heidelberg University Hospital, Heidelberg, Germany
| | - Dirk Jaeger
- Department of Nuclear Medicine, Mainz University Hospital, Mainz, Germany
| | - Juergen Debus
- Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany
- National Center of Radiation Oncology, Heidelberg Institute of Radiation Oncology, Heidelberg, Germany
- Clinical Cooperation Unit Radiation Oncology, German Cancer Research Center, Heidelberg, Germany
- German Cancer Consortium, Heidelberg, Germany
| | - Uwe Haberkorn
- Department of Nuclear Medicine, Heidelberg University Hospital, Heidelberg, Germany
- Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, Heidelberg, Germany
| | - Frederik L Giesel
- Department of Nuclear Medicine, Heidelberg University Hospital, Heidelberg, Germany
- Department of Medical Oncology, National Center for Tumor Diseases, Heidelberg University Hospital, Heidelberg, Germany
- Department of Nuclear Medicine, Medical Faculty, Heinrich-Heine University, University Hospital Düsseldorf, Düsseldorf, Germany; and
- Institute for Radiation Sciences, Osaka University, Osaka, Japan
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4
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Hoppner J, van Genabith L, Hielscher T, Heger U, Sperling L, Colbatzky T, Gutjahr E, Lang M, Pausch T, Spektor AM, Glatting FM, Liermann J, Hackert T, Kratochwil C, Giesel FL, Haberkorn U, Röhrich M. Comparison of early and late 68Ga-FAPI-46-PET in 33 patients with possible recurrence of pancreatic ductal adenocarcinomas. Sci Rep 2023; 13:17848. [PMID: 37857656 PMCID: PMC10587145 DOI: 10.1038/s41598-023-43049-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 09/18/2023] [Indexed: 10/21/2023] Open
Abstract
Positron emission tomography with 68Gallium (68Ga) labeled inhibitors of fibroblast activation protein (68Ga-FAPI-PET) is a promising imaging technique for patients with recurrent pancreatic ductal adenocarcinomas (PDAC). To date, it is not clear if different acquisition timepoints for 68Ga-FAPI-PET may result in comparable imaging information and if repetitive 68Ga-FAPI-PET imaging may add diagnostic value to single timepoint acquisition for recurrent PDAC. Here we analyzed retrospectively early (20 min p.i.) and late (60 min p.i.) 68Ga-FAPI-PET imaging using FAPI-46 of 33 patients with possible recurrence of PDAC concerning detection rates and uptake over time of local recurrences, metastases, inflammatory lesions of the pancreas, cholestatic lesions of the liver and reactive tissue. 33 patients with histologically confirmed PDAC after complete or partial resection of the pancreas and possible recurrence were examined by 68Ga-FAPI-46-PET acquired 20- and 60-min post injection (p.i.) of the radiotracer. FAPI-positive lesions were classified as local recurrences, metastases, inflammatory lesions of the pancreas (ILP), cholestatic lesions of the liver and reactive tissue based on histology, PET- and CT-morphology and clinical information. Lesions were contoured, and standardized uptake values (SUVmax and SUVmean) and target-to-background ratios (TBR) were analyzed for both acquisition timepoints. In total, 152 FAPI-positive lesions (22 local relapses, 47 metastases, 26 inflammatory lesions of the pancreas, 28 reactive tissues, and 29 cholestatic lesions) were detected. Detection rates for the early and late acquisition of 68Ga-FAPI-46-PET were almost identical except cholestatic lesions, which showed a higher detection rate at early imaging. SUV parameters and TBRs of ILP significantly decreased over time. Cholestatic lesions showed a tendency towards decreasing uptake. All other types of lesions showed relatively stable uptake over time. Early and late acquisition of 68Ga-FAPI-PET results in comparable imaging information in patients with possible recurrence of PDAC. Two timepoint imaging offers additional diagnostic potential concerning differential diagnoses.
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Affiliation(s)
- Jorge Hoppner
- Department of Nuclear Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany
| | - Levin van Genabith
- Department of Nuclear Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany
| | - Thomas Hielscher
- Department of Biostatistics, German Cancer Research Center, Heidelberg, Germany
| | - Ulrike Heger
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Lucas Sperling
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Teresa Colbatzky
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Ewgenija Gutjahr
- Department of Pathology, University Hospital Heidelberg, Heidelberg, Germany
| | - Matthias Lang
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Thomas Pausch
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Anna-Maria Spektor
- Department of Nuclear Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany
| | - Frederik M Glatting
- Clinical Cooperation Unit Molecular and Radiation Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Jakob Liermann
- Department of Radiation Oncology, University Hospital Heidelberg, Heidelberg, Germany
| | - Thilo Hackert
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Clemens Kratochwil
- Department of Nuclear Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany
| | - Frederik L Giesel
- Department of Nuclear Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany
- Department of Nuclear Medicine, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Uwe Haberkorn
- Department of Nuclear Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany
- Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Manuel Röhrich
- Department of Nuclear Medicine, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany.
- Department of Nuclear Medicine, University Hospital Mainz, Langenbeckstraße 1, 55131, Mainz, Germany.
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5
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Lang M, Spektor AM, Hielscher T, Hoppner J, Glatting FM, Bicu F, Hackert T, Heger U, Pausch T, Gutjahr E, Rathke H, Giesel FL, Kratochwil C, Tjaden C, Haberkorn U, Röhrich M. Static and Dynamic 68Ga-FAPI PET/CT for the Detection of Malignant Transformation of Intraductal Papillary Mucinous Neoplasia of the Pancreas. J Nucl Med 2023; 64:244-251. [PMID: 35906094 PMCID: PMC9902850 DOI: 10.2967/jnumed.122.264361] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 07/16/2022] [Accepted: 07/16/2022] [Indexed: 02/04/2023] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) may arise from intraductal papillary mucinous neoplasms (IPMN) with malignant transformation, but a significant portion of IPMN remains to show benign behavior. Therefore, it is important to differentiate between benign IPMN and IPMN lesions undergoing malignant transformation. However, nonoperative differentiation by ultrasound, CT, MRI, and carbohydrate antigen 19-9 (CA19-9) is still unsatisfactory. Here, we assessed the clinical feasibility of additional assessment of malignancy by PET using 68Ga-labeled fibroblast activation protein inhibitors (68Ga-FAPI PET) in 25 patients with MRI- or CT-proven cystic pancreatic lesions. Methods: Twenty-five patients with cystic pancreatic lesions who were followed up in the European Pancreas Center of Heidelberg University hospital and who were led to surgical resection or fine-needle aspiration due to suspicious clinical, laboratory chemistry, or radiologic findings were examined by static (all patients) and dynamic (20 patients) 68Ga-FAPI PET. Cystic pancreatic lesions were delineated and SUVmax and SUVmean were determined. Time-activity curves and dynamic parameters (time to peak, K 1, k 2, K3, k 4) were extracted from dynamic PET data. Receiver-operating curves of static and dynamic PET parameters were calculated. Results: Eleven of the patients had menacing IPMN (high-grade IPMN with [6 cases] or without [5 cases] progression into PDAC) and 11 low-grade IPMN; 3 patients had other benign entities. Menacing IMPN showed significantly elevated 68Ga-FAPI uptake compared with low-grade IPMN and other benign cystic lesions. In dynamic imaging, menacing IPMN showed increasing time-activity curves followed by slow decrease afterward; time-activity curves of low-grade IPMN showed an immediate peak followed by rapid decrease for about 10 min and slower decrease for the rest of the time. Receiver-operating curves showed high sensitivity and specificity (area under the curve greater than 80%) of static and dynamic PET parameters for the differentiation of IPMN subtypes. Conclusion: 68Ga-FAPI PET is a helpful new tool for the differentiation of menacing and low-grade IPMN and shows the potential to avoid unnecessary surgery for nonmalignant pancreatic IPMN.
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Affiliation(s)
- Matthias Lang
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Anna-Maria Spektor
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Thomas Hielscher
- Department of Biostatistics, German Cancer Research Center, Heidelberg, Germany
| | - Jorge Hoppner
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Frederik M. Glatting
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;,Clinical Cooperation Unit Molecular and Radiation Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany;,Department of Radiation Oncology, University Hospital Heidelberg, Heidelberg, Germany
| | - Felix Bicu
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Thilo Hackert
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Ulrike Heger
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Thomas Pausch
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Ewgenija Gutjahr
- Department of Pathology, University Hospital Heidelberg, Heidelberg, Germany
| | - Hendrik Rathke
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;,Department of Nuclear Medicine, The Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Frederik L. Giesel
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;,Department of Nuclear Medicine, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Clemens Kratochwil
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Christine Tjaden
- Department of General, Visceral, and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Uwe Haberkorn
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;,Translational Lung Research Center Heidelberg (TLRC), Member of the German Center for Lung Research DZL, Heidelberg, Germany; and,Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Manuel Röhrich
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;
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6
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Glatting FM, Hoppner J, Liew DP, van Genabith A, Spektor AM, Steinbach L, Hubert A, Kratochwil C, Giesel FL, Dendl K, Rathke H, Kauczor HU, Huber PE, Haberkorn U, Röhrich M. Repetitive Early 68Ga-FAPI PET Acquisition Comparing 68Ga-FAPI-02, 68Ga-FAPI-46, and 68Ga-FAPI-74: Methodologic and Diagnostic Implications for Malignant, Inflammatory/Reactive, and Degenerative Lesions. J Nucl Med 2022; 63:1844-1851. [PMID: 35618480 PMCID: PMC9730916 DOI: 10.2967/jnumed.122.264069] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 05/16/2022] [Indexed: 01/11/2023] Open
Abstract
68Ga-labeled fibroblast activation protein (FAP) inhibitor (68Ga-FAPI) PET targets 68Ga-FAPI-positive activated fibroblasts and is a promising imaging technique for various types of cancer and nonmalignant pathologies. However, discrimination between malignant and nonmalignant 68Ga-FAPI-positive lesions based on static PET with a single acquisition time point can be challenging. Additionally, the optimal imaging time point for 68Ga-FAPI PET has not been identified yet, and different 68Ga-FAPI tracer variants are currently used. In this retrospective analysis, we evaluate the diagnostic value of repetitive early 68Ga-FAPI PET with 68Ga-FAPI-02, 68Ga-FAPI-46, and 68Ga-FAPI-74 for malignant, inflammatory/reactive, and degenerative lesions and describe the implications for future 68Ga-FAPI imaging protocols. Methods: Whole-body PET scans of 24 cancer patients were acquired at 10, 22, 34, 46, and 58 min after the administration of 150-250 MBq of 68Ga-FAPI tracer molecules (8 patients each for 68Ga-FAPI-02, 68Ga-FAPI-46, and 68Ga-FAPI-74). Detection rates and SUVs (SUVmax and SUVmean) for healthy tissues, cancer manifestations, and nonmalignant lesions were measured, and target-to-background ratios (TBR) versus blood and fat were calculated for all acquisition time points. Results: For most healthy tissues except fat and spinal canal, biodistribution analysis showed decreasing uptake over time. We analyzed 134 malignant, inflammatory/reactive, and degenerative lesions. Detection rates were minimally reduced for the first 2 acquisition time points and remained at a constant high level from 34 to 58 min after injection. The uptake of all 3 variants was higher in malignant and inflammatory/reactive lesions than in degenerative lesions. 68Ga-FAPI-46 showed the highest uptake and TBRs in all pathologies. For all variants, TBRs versus blood constantly increased over time for all pathologies, and TBRs versus fat were constant or decreased slightly. Conclusion: 68Ga-FAPI PET/CT is a promising imaging modality for malignancies and benign lesions. Repetitive early PET acquisition added diagnostic value for the discrimination of malignant from nonmalignant 68Ga-FAPI-positive lesions. High detection rates and TBRs over time confirmed that PET acquisition earlier than 60 min after injection delivers high-contrast images. Additionally, considering clinical feasibility, acquisition at 30-40 min after injection might be a reasonable compromise. Different 68Ga-FAPI variants show significant differences in time-dependent biodistributional behavior and should be selected carefully depending on the clinical setting.
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Affiliation(s)
- Frederik M. Glatting
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;,Clinical Cooperation Unit Molecular and Radiation Oncology, German Cancer Research Center, Heidelberg, Germany;,Department of Radiation Oncology, University Hospital Heidelberg, Heidelberg, Germany
| | - Jorge Hoppner
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;,Department of Diagnostic and Interventional Radiology, University of Heidelberg, Heidelberg, Germany
| | - Dawn P. Liew
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Antonia van Genabith
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Anna-Maria Spektor
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Levin Steinbach
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Alexander Hubert
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Clemens Kratochwil
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Frederik L. Giesel
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;,Department of Nuclear Medicine, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Katharina Dendl
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Hendrik Rathke
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;,Department of Nuclear Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Hans-Ulrich Kauczor
- Department of Diagnostic and Interventional Radiology, University of Heidelberg, Heidelberg, Germany;,Translational Lung Research Center Heidelberg, Member of the German Center for Lung Research DZL, Heidelberg, Germany; and
| | - Peter E. Huber
- Clinical Cooperation Unit Molecular and Radiation Oncology, German Cancer Research Center, Heidelberg, Germany;,Department of Radiation Oncology, University Hospital Heidelberg, Heidelberg, Germany
| | - Uwe Haberkorn
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;,Translational Lung Research Center Heidelberg, Member of the German Center for Lung Research DZL, Heidelberg, Germany; and,Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, Heidelberg, Germany
| | - Manuel Röhrich
- Department of Nuclear Medicine, University Hospital Heidelberg, Heidelberg, Germany;,Translational Lung Research Center Heidelberg, Member of the German Center for Lung Research DZL, Heidelberg, Germany; and
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Spektor AM, Blushteĭn LI, Kozhin AA. [Electrophysiological research on uterine and ovarian functions in women using intrauterine coils for contraception]. Akush Ginekol (Mosk) 1986:50-1. [PMID: 2949654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Spektor AM. [Outcome of rheumatism in patients over 50 years of age (clinico-morphological data)]. Vopr Revm 1975:45-8. [PMID: 1220195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Spektor AM. [Rheumatic heart defects in persons over 50 years of age]. Vopr Revm 1974:39-40. [PMID: 4446490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Spektor AM. [Diagnosis of rheumatism in patients over 50 years of age in polyclinics]. Vopr Revm 1970; 10:29-31. [PMID: 5503967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Spektor AM. [Phonocardiography in the diagnosis of free artrial thrombus]. Sov Med 1969; 32:139-41. [PMID: 5380410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Spektor AM. [Temporary disordrs of intraventricular conductivity (unstable intraventricular block)]. Klin Med (Mosk) 1967; 45:43-8. [PMID: 5614673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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