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Erschienen in: Wiener Medizinische Wochenschrift 1-2/2019

Open Access 04.09.2018 | main topic

Current status of functional imaging in neuroblastoma, pheochromocytoma, and paraganglioma disease

verfasst von: Alexander Stephan Kroiss, MD

Erschienen in: Wiener Medizinische Wochenschrift | Ausgabe 1-2/2019

Summary

Diagnostic imaging plays an important role in the detection of paraganglioma (PGL), pheochromocytoma (PCC), and neuroblastoma (NB). Anatomic imaging, for example CT or MRI, offers high sensitivity in these neuroendocrine tumors (NET) but only moderate specificity, often associated with difficulties in clearly distinguishing between NET and non-NET. Functional imaging, as in the use of different radioisotopes, is indispensable in oncological imaging. The introduction of PET and PET/CT, respectively, led to a dramatic improvement in both malignant and non-malignant PGL, PCC, and NB, assessing the exact tumor extent. This review gives an overview of functional and anatomical imaging in PGL, PCC, and NB.

Introduction

Tumors of the neural crest have a wide range of clinical presentations. These neuroendocrine tumors (NET)—with the ability to overexpress somatostatin (SST)—are referred to as pheochromocytoma (PCC) and neuroblastoma (NB) if they arise from the chromaffin cells of the adrenal medulla, whereas extra-adrenal tumors arising from the (para) sympathetic nervous system are known as paraganglioma (PGL). These tumors can be found anywhere from the neck to the pelvis [1]. Because of their neuroendocrine origin, most abdominal and thoracic extra-adrenal PGL produce catechol amines and related substances, whereas head and neck PGL (HNPGL) usually do not produce such substances [2]. Compared to HNPGL, which are usually of parasympathetic origin, extra-cervical PGL, PCC, and NB are associated with sympathetic ganglia.
Due to the high vascularization rate of these NET, a biopsy often cannot be performed in clinical routine. Therefore, diagnostic imaging is crucial to predict the exact tumor extent, foremost in metastatic disease.

Anatomical imaging

Anatomical imaging serves as the first-line modality in the locoregional staging of these tumors. Morphological imaging, such as CT or MRI, provides excellent anatomical detail and high sensitivity (100%; [2]), but lacks specificity as difficulties may occur when distinguishing between tumors derived from the sympathetic nervous system and other tumor entities [1]. Compared to MRI, CT offers less motion artefacts and better spatial resolution. On the other hand, MRI provides better soft tissue contrast than does CT, renouncing the use of ionic intravenous contrast agents which can lead to side effects such as allergic reactions, hypertensive crisis, or nephropathy.

Functional imaging

In contrast to CT and MRI, functional imaging modalities serve as a useful diagnostic tool for distinguishing between viable tumor and a nonviable residual lesion without being affected by anatomical distortion after surgery or irradiation, which is a limitation of anatomical imaging. Compared with anatomical imaging, radionuclide imaging (conventional scintigraphy, PET) shows both high sensitivity and specificity, distinguishing between scars and tumor recurrence after previous surgery.

Conventional scintigraphy

123I-MIBG: non-metastatic PCC/PGL and NB

Attempts to image PCC and NB by specific radiotracer techniques began with the development of metaiodobenzylguanidine (MIBG) in 1980. MIBG acts as a functional analogue of norepinephrine in following the so-called uptake-1 pathway in adrenergic cells, being stored in granules and released by exocytosis [3]. Labelled with 123I, MIBG has become the standard in clinical practice due to the favorable characteristics of the labelling radioisotope 123I, with its shorter half-life, higher emitted photon flux, and lack of beta particulate emission as compared to 131I [3]. Radiolabeled MIBG has to be administered by slow intravenous injection after thyroid blockade (either with sodium perchlorate or potassium iodide orally beginning 1 day before tracer injection and continuing for 5–7 days). To avoid false-negative results, drugs that are known or expected to reduce MIBG accumulation have to be withdrawn for 48 to 72 h prior to imaging, such as tricyclic antidepressants, reserpine, or sympathomimetic amines [1, 4, 5]. 123I-MIBG provides valuable prognostic information before/after 131I-MIBG therapy in these NET [3]. 123I-MIBG has been found to be highly sensitive and specific in non-malignant PCC and extra-cervical PGL (84% and 100%, 75% and 100%, respectively; [2, 6]). Reported sensitivity/specificity of 123I-MIBG scintigraphy was found to be 87% and 96%, respectively, for detecting NB [7, 8].
Compared to 123I-MIBG planar whole-body imaging single photon emission computed tomography (SPECT) and combined SPECT/CT may increase sensitivity in both, PCC and PGL [2, 3]. However, lesions beyond the diameter of 1 cm can be missed by both 123I-MIBG and SPECT [2].
An additional reason for this discrepancy can be explained on a molecular level: PGL may undergo dedifferentiation, leading to a loss of norepinephrine transporter or vesicular monoamine transporter (VMAT), which could then lead to false-negative findings in metastatic disease [2], concluding that particularly NET of parasympathetic origin (HNPGL) are not suitable for 123I-MIBG imaging [9].

111In-octreotide: HNPGL

SST is a peptide hormone containing 14 amino acids. In 1982, the long-acting SST analogue octreotide was synthesized, which can be used for therapy by blocking the excessive hormone production by NET [4]. To date, five receptor subtypes have been characterized that are G protein-coupled and able to bind SST. Abundant expression of SST is characteristic of NET, with overexpression of SST receptor subtype 2 in most NET.
Planar and SPECT imaging using 111In-diethylenetriaminepentaacetic acid octreotide (111In-octreotide) is an accepted functional imaging modality for the diagnosis of SST-positive NET, particularly for HNPGL [4, 9]. Similar to 123I-MIBG, 111In-octreotide offers pretherapeutic staging for peptide receptor radionuclide therapy (PRRT) in NET [4], particularly useful in surgically inoperable tumors or metastatic disease. 111In-octreotide scintigraphy should be performed not earlier than 6 weeks after the last injection of long-acting SST analogue. Koopmans and colleagues reported that both 111In-pentetreotide and anatomical imaging (CT/MRI) showed a sensitivity of 93% in the detection of HNPGL, with that of 123I-MIBG imaging being only 44%, suggesting that 111In-pentetreotide is a more suitable functional imaging tool for assessing HNPGL disease, particularly when there is high clinical suspicion and negative 123I-MIBG scintigraphy [9]. Similar to 123I-MIBG, the main disadvantage of 111In-pentetreotide scintigraphy remains the inherently limited spatial resolution of SPECT and SPECT/CT.

PET imaging

The introduction of PET and combined PET/CT into clinical practice including the development of new PET radiopharmaceuticals has produced promising results in the detection of these tumors. Compared to planar scintigraphy and SPECT imaging, PET has a much shorter injection-to-imaging interval, higher spatial resolution (beyond 4–5 mm), and a shorter scanning time within 2 h.

18F-FDG: genetic mutation of SDHB and negative 123I-MIBG NET

18F-fluorodeoxyglucose (18F-FDG) is used for the detection and management of many types of tumors in children and adults. 18F-FDG portrays the glucose metabolic activity of tumors, and its uptake and retention are unrelated to catecholamine uptake and storage [3]. 18F-FDG PET provides high sensitivity in patients with genetic mutation of succinate dehydrogenase subunit B (SDHB) in metastatic disease of PCC and PGL (83%; [2]).
18F-FDG PET appears valuable for the localization of NET which do not accumulate MIBG or other tracers of the sympathetic nervous system [3]. On the other hand, 18F-FDG has limited value in the detection of these NET due to uptake in various tumors, leading to decreased specificity [2, 10]. Taggart DR and colleagues compared functional imaging modalities using 18F-FDG and 123I-MIBG in patients suffering from relapsed NB before and after 123I-MIBG therapy, and concluded that FDG is not sensitive enough, especially for the detection of bone lesions, because bone marrow may also demonstrate increased 18F-FDG uptake due to bone marrow hyperplasia after myelosuppressive chemotherapy, particularly in advanced stages of NB [11].

18F-DOPA: non-metastatic (HN)PGL/PCC and NB

In contrast to 18F-FDG, 18F-fluoro-L-dihydroxyphenylalanine (18F-DOPA) is a very useful radiopharmaceutical for imaging catecholamine-secreting tumors [1], because of the ability of these tumors to take up, decarboxylate, and store amino acids, such as DOPA, and their biogenic amines (dopamine; [12]). Similar to MIBG, dopamine is actively transported via VMAT after uptake into cells by the norepinephrine transporter, being stored in neurosecretory granules of catecholamine-producing cells. In order to visualize small lesions, carbidopa pretreatment can be applied before staging.
Carbidopa is a drug which decreases decarboxylation and subsequent renal clearance of DOPA, leading to an increase of the tumor to background ratio of radiopharmaceutical uptake. In general, carbidopa pretreatment has a minor effect on lesions depicted by 18F-DOPA PET, because even with carbidopa pretreatment, the performance of 18F-DOPA PET appears to be suboptimal in case of metastatic disease [2].
18F-DOPA offers high sensitivity and specificity for detecting non-metastatic PCC (both 100%; [6]). However, decreased sensitivity with reference to CT/MRI was reported in metastatic disease of SDHB mutation-related PCC and PGL (20–45%; [2, 13]). These differences in 18F-DOPA accumulation between primary tumors and metastases of PCC and PGL were previously reported. This phenomenon is probably due to the fact that metastatic lesions have dedifferentiated cells. This dedifferentiation might lead to loss of specific norepinephrine transporters in these tumors [2].
A recent publication confirmed the superiority of combined functional and anatomical imaging (18F-DOPA PET/CT) over conventional scintigraphy (123I-MIBG; [14]) in extra-adrenal PGL of ten patients. In this article by Kroiss A and colleagues, 18F-DOPA PET and diagnostic CT detected all HNPGL, whereas 18F-DOPA PET failed to detect eight bone metastases that were verified by diagnostic CT, resulting in an overall decrease of sensitivity on a per-lesion basis for malignant HNPGL (69.2%). Combined functional and anatomical imaging (18F-DOPA PET/CT) was required to fully delineate the extent of tumor disease, emphasizing the low sensitivity of both planar 123I-MIBG and SPECT/CT imaging for malignant HNPGL (5.6% and 11.1%, respectively; [14]).
For NB in stages 3 and 4, a sensitivity and accuracy of 90% were reported on a lesion-based analysis for 18F-DOPA PET/CT compared to 123I-MIBG scintigraphy with 56% and 57%, respectively [15]. Although no significant difference in terms of specificity was found between the two imaging modalities (18F-DOPA PET/CT: 75%; 123I-MIBG imaging: 62%), the authors recommend 18F-DOPA PET/CT for NB taking into account the significant superiority (p < 0.001) of detecting soft tissue recurrence/metastases (84%) and bone lesions (96%) compared to 123I-MIBG scintigraphy (31% and 71%; [15]).

68Ga-labelled analogues: (non)-metastatic (HN)PGL and metastatic PCC/NB

The introduction of 68Ga-labelled SST analogues (e. g., 68G-DOTA-TOC, 68Ga-DOTA-NOC, 68Ga-DOTA-TATE) into clinical routine led to a dramatic improvement in sensitivity and specificity for imaging NET [16]. Due to its overall higher counting efficiency and higher spatial resolution, 68Ga PET is a more sensitive detection technique than conventional scintigraphy due to its high SST expression in subtypes 2, 3, and 5 in NET [16]. Due to high physiologic SST expression in both adrenal glands, 68Ga-labelled SST analogues may not be suitable for detecting PCC [17]. However, a recent publication showed promising results in the detection of suspected PCC: In contrast to 18F-FDG PET/CT, all primary tumors (nine patients) were correctly identified by 68Ga-DOTA-TATA PET/CT and 123I-MIBG SPECT/CT compared with postsurgical pathology and follow-up [18].
Our group reported on the high sensitivity of 68Ga-DOTA-TOC PET compared to 123I-MIBG imaging in both malignant PCC (91.7% versus 63.3%) and NB (97.2% versus 90.7%), with anatomical imaging (CT/MRI) as the reference standard. Additionally, we reported that especially bone metastases were more readily detectable in favor of higher spatial PET resolution compared to planar 123I-MIBG imaging (Fig. 1; [19]). The high detection rate of 68Ga-DOTA-TOC PET/CT (100%) compared to 123I-MIBG planar (3.4%) and SPECT/CT (6.9%) imaging in both non-malignant and malignant HNPGL of ten patients was recently confirmed [20], in line with a previous publication of Sharma P and colleagues, who found a significantly lower detection rate for 131I-MIBG scintigraphy (38.4%) compared to 68Ga-DOTA-NOC PET/CT (100%) in staging of HNPGL [21].
Besides the high accuracy in staging, 68Ga-labelled SST analogues give valuable information on tumor cell receptor status in NET when planning PRRT, similar to the information available with 123I-MIBG regarding treatment with 131I-MIBG [17]. Recent articles confirmed the benefit of combined functional and anatomical imaging (e. g., PET/CT) with change of tumor staging from non-malignant to metastatic disease in these rare NET, most observed for bone metastases (Figs. 234 and 5; [19]).
A recent publication by Janssen I and colleagues showed a lesion-based detection rate of 97.6% for 68Ga-DOTA-TATE PET/CT compared to 18F-DOPA PET/CT (74.8%), 18F-FDG PET/CT (49.2%), and CT/MRI (81.6%) in sporadic malignant PCC and PGL of 22 patients. 68Ga-DOTA-TATE detected all bone lesions and lymph nodes of the mediastinum and abdomen. On the other hand, 68Ga-DOTA-TATE missed six liver lesions, which were positive on 18F-DOPA and anatomical imaging. In addition, five lesions missed on 68Ga-DOTA-TATE PET/CT were pulmonary lesions—smaller than 0.6 cm—with four of them positive on 18F-DOPA [22]. In consideration of the limited PET spatial resolution and in addition to 68Ga-SST-labelled analogues, dedicated MRI and CT imaging of the liver and lungs is needed in order not to miss small metastases [19, 22]. Our group also reported on false-negative liver lesions of PCC and NB patients in both 68Ga-DOTA-TOC PET and 123I-MIBG imaging, which, however, were positive on CT/MRI [19]. This is in line with publication by Pfluger T and colleagues who compared 123I-MIBG imaging to MRI in pediatric NB [23]. In this context, 18F-FDG is a better tool for analyzing this organ [19, 24].
A recent publication by Nicolas GP and colleagues compared the sensitivity of 68Ga-DOTA-TOC PET/CT to 68Ga-OPS202—a novel radiolabeled SST receptor antagonist with high affinity for SST subtype 2—in twelve patients with metastatic gastroenteropancreatic NET. Their results showed a significant higher lesion detection rate for 68Ga-OPS202 PET/CT compared to 68Ga-DOTA-TOC PET/CT, most observed for liver lesions [25]. In the future, 68Ga-OPS202 PET/CT may be of high interest for the detection of both metastatic and non-metastatic NET like PCC, PGL, and NB.

Conclusion

Early detection of PCC, PGL, and NB is crucial and has a major effect on treatment and prognosis, particularly in metastatic disease. Combined functional and anatomical imaging (e. g., PET/CT) is required to fully delineate the extent of NET of both the sympathetic (PCC, extra-adrenal PGL, and NB) and parasympathetic nervous system (HNPGL). Similar to 123I-MIBG, 68Ga-labelled SST analogues provide valuable clinical information for planning PRRT in NET, which is particularly useful in patients with surgically inoperable tumors or metastatic disease. Prospective studies with novel combined functional/anatomical techniques (PET/MRI) are required to confirm the specificity of both 68Ga-labelled SST analogues and antagonists in these rare NET.

Conflict of interest

A.S. Kroiss declares that he has no competing interests.
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://​creativecommons.​org/​licenses/​by/​4.​0/​), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Metadaten
Titel
Current status of functional imaging in neuroblastoma, pheochromocytoma, and paraganglioma disease
verfasst von
Alexander Stephan Kroiss, MD
Publikationsdatum
04.09.2018
Verlag
Springer Vienna
Erschienen in
Wiener Medizinische Wochenschrift / Ausgabe 1-2/2019
Print ISSN: 0043-5341
Elektronische ISSN: 1563-258X
DOI
https://doi.org/10.1007/s10354-018-0658-7

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