molecular imaging of net - human health campus · molecular imaging of net prof. dr. christophe...
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Molecular Imaging of NET
Prof. Dr. Christophe Deroose
Nuclear Medicine - University Hospitals Leuven (UZ Leuven)
Department of Imaging & Pathology – KU Leuven
Leuven Cancer Institute (LKI)
Leuven, Belgium International Course on
THERANOSTICS AND MOLECULAR
RADIOTHERAPY Tuesday October 3rd 2017
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Vector:
Is responsible for a specific interaction
with the target (receptor, transporter,
enzyme,…)
For molecular imaging (diagnosis)
Radionuclide:
Emits radiation upon decay.
The radiation can be detected
by the nuclear medicine
cameras
Radiopharmaceutical: diagnostic
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Molecular targets for GEP-NET imaging
Lysosome
Nucleus
Secretory
vesicle
99mTc-DMSA
11C-5-HTP
18F-DOPA
123I-IMT
Phosphate
metabolism
Serotonin pathway
Catecholamine pathway IMT
Secretory
vesicle
18F-Dopamine
123I-MIBG 18F-FDG
Glucose metabolism
Adapted from Koopmans, Crit Rev Oncol Hematol, 2009; 71(3):199-213
Passive diffusion
Active transport
Receptor/ligand internalisation
LAT1 amino acid
transporter
Noradrenaline
transporter
NaPi
co-transporter
GLUT glucose
transporter
VMAT transporter
Somatostatin
receptor
Bombesin
receptor
CCK receptor
VIP receptor
GLP1 receptor
Peptide
receptors
Receptor-based 1. Receptor-based techniques
2. Metabolism based
a) Precursor uptake
b) Neurotransmitter uptake
Metabolic tracers
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MOLECULAR IMAGING IN NET
SOMATOSTATIN RECEPTOR
IMAGING
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Peptide Receptors
Nucleus
Secretory
vesicle
99mTc-DMSA
11C-5-HTP
18F-DOPA
123I-IMT
Phosphate
metabolism
Serotonin pathway
Catecholamine pathway IMT
Secretory
vesicle
18F-Dopamine
123I-MIBG 18F-FDG
Glucose metabolism
Passive diffusion
Active transport
Receptor/ligand internalisation
LAT1 amino acid
transporter
Noradrenaline
transporter
NaPi
co-transporter
GLUT glucose
transporter
VMAT transporter
Peptide
receptors
Lysosome
Somatostatin
receptor
Bombesin
receptor
CCK receptor
VIP receptor
GLP1 receptor
Receptor-based
Adapted from Koopmans, Crit Rev Oncol Hematol, 2009; 71(3):199-213
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Somatostatin Receptor (SSTR)
• Seven transmembrane G-coupled receptor
• Six human subtypes
– SSTR1
– SSTR2 (2A & 2B)
– SSTR3
– SSTR4
– SSTR5
• Function
– secretions
• Endocrine
• Exocrine
– Cell growth
– Apoptosis
• Internalise upon agonist binding / recycle
Weckbecker, 2003, Nat Rev Drug Disc; 2(12):999-1017 Waser, 2009, J Nucl Med; 50(6):936-41
Vector
Receptor
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Overexpression of SSTR subtypes on
NET
• cytoplasmic staining
– SSTR1
– SSTR3
– SSTR5
• membrane bound
– SSTR2A
Kaemmerer, 2011, Eur J Nucl Med Mol Imaging;
38(9):1659-68 NET LN+ NET ileum pNET
48%
86%
87%
50%
46% N=34
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SSTR overexpressing tumortypes
• Carcinoid:
– Thymus
– Bronchus
– Esophagus
– Stomach
– Small bowel
– Appendix
– Large bowel
– Unkown primary
• Pancreatic NET
– Gastrinoma
– Insulinoma
– Glucagonoma
– VIPoma
– ACTHoma
– Somatostinoma
– Non-functioning
– Medullary thyroid carcinoma
– Neuroblastoma
– Pheochromocytoma
– Paraganglioma
– Small-cell lung cancer
– Pituitary gland tumours
– Merkel cell tumours
– Menigeoma
– Renal cell carcinoma
– GIST
NET Other tumour entities
GEP
-NET
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The somatostatin receptor as a
molecular target in NET
• Overexpression correlates with differentiation status
• No correlation with hormonal function of tumor
• SSTR target of pharmacological and radionuclide therapy – SRS as predictive marker
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Diagnostic agents for SSR
DIAGNOSTIC COMBINATIONS:
• 111In-DTPA-octreotide (pentetreotide) (Octreoscan®)
• 68Ga-DOTA,Tyr3-octreotide (68Ga-DOTATOC)
• 68Ga-DOTA,Tyr3-octreotate (68Ga-DOTATATE)
• 68Ga-DOTA, [Phe1-1-Nal3]-octreotide) (68Ga-DOTANOC)
Chelator 111Indium 99mTechnetium 68Gallium 18Fluorine 64Copper
DTPA
DOTA
NOTA
HYNIC
Octreotide
Tyr3-octreotide
Tyr3-octreotate
Naph-octreotide
SPECT
PET
Radio-
nuclide
Somatostatin analogue
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Vector molecule for SSTR
• Somatostatin: plasma T1/2 ~1 to 3 min
• Chemical modification needed
Trp
Phe-Phe-Asn-Lys-Cys-Gly-Ala-H
Thr- Phe-Thr- Ser-Cys-OH
Lys
Somatostatin (SS14), 14 amino acids
Tyr-Cys-DPhe-H
Thr- Cys-Thr(ol)
Trp
Lys
Tyr3-Octreotide, 8 amino acids (TOC)
Phe-Cys-DPhe-H
Thr- Cys-Thr(ol)
Trp
Lys
Octreotide, 8 amino acids
T1/2 ~ 90 min
Tyr-Cys-DPhe-H
Thr- Cys-Thr
Trp
Lys
Tyr3-Octreoate, 8 amino acids (TATE)
Naphtalene3-Octreotide, 8 amino acids (NOC)
Naϕ-Cys-DPhe-H
Thr- Cys-Thr(ol)
Trp
Lys
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Radioisotope – Indium-111
• Indium-111 (111In)
• Gamma-emitter (also Auger)
• Cyclotron product
– p,2n reaction of cadmium Cd-112
• Metal
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Radioisotope – Gallium-68
• Gallium-68 (68Ga)
• Positron emitter
• Generator product (germanium-68)
• No cyclotron needed for production (≠18F)
• Metal
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Affinity profiles (IC50 in nM) of SS
analogues for human SSTR
Wild, 2005, Eur J Nucl Med Mol Imaging; 32(6):724-724
Reubi, Eur J Nucl Med 2000;27(3): 273-82
SSTR1 SSTR2 SSTR3 SSTR4 SSTR5
Very high High Moderate Low
PAN 2,5
2
2,5
2
Ga-DOTA-NOC >10,000 1.9 ± 0,4 40 ± 5.8 260± 74 7.2± 1.6 2,3,5
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68Ga-DOTATOC: normal biodistribution
• High uptake:
– Spleen
– Adrenals
– Pituitary gland
– Kidney
– Bladder
• Moderate:
– Liver
– Pancreas
(head/uncinate process)
– Bowel
– Inflammatory LN
• Low:
– Lung
– Brain
– Muscle SUV: 0-7 SUV: 0-16
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68Ga-DOTATOC normal biodistribution:
adrenal
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68Ga-DOTATOC PET/CT is highly
sensitive for small tumors
MIP
Transverse
Transverse
CT & Fusion
MEN 1
Smallest lesion is 10 mm, but it
is hotter than the spleen!
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68Ga-DOTATATE: detection of small
lesions
Liver M+ LN: SUVmax 35
LN: SUVmax 4.5 – 4 mm LN: SUVmax 8.5 – 7 mm
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Contribution of SSTR radionuclide
imaging • Sensitive and specific detection of tumoral lesions,
including very small lesions (G1&G2): – Diagnosis of NET in cases of clinical suspicion
• lesion on morphological imaging
• hormonal symptoms
• serum chromogranin A
– Pre-operative staging
– Post-operative staging
– Suspicion of recurrence
– Advanced therapy planning: liver surgery, debulking, SIRT, liver Tx, …
• Molecular characterization of tumoral lesions: – Predictive biomaker for cold somatostatin analogue (SSA)
treatment
– Predictive biomaker for peptide receptor radionuclide therapy (PRRT)
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2012 ESMO guidelines for NET
management • response evaluation and follow-up
• Follow-up investigations should include biochemical
• parameters and conventional imaging. In patients with R0/R1
• resected NET G1/G2, it is recommended that imaging is
• performed every 3–6 months (CT or MRI), and in NEC G3,
• every 2–3 months. Somatostatin receptor imaging, either
• Octreoscan or PET/CT using 68Ga-DOTA-TOC/-NOC/-TATE
• should be included in the follow-up and is recommended after
• 18–24 months if expression of somatostatin receptor 2a has
• been proven on the tumor cells. In the case of rapid tumor
• progression or if imaging information is lacking, it may be
• necessary to re-biopsy liver metastases to re-assess the
• proliferative activity. If chromogranin A is not elevated NSE
• represents an alternative biomarker.
Öberg, 2012, Ann Oncol; Suppl 7:vii 124-30
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ENETS Guidelines Si-NET:
SRS only if gallium-68 not available!
In the search for a primary tumor, cross-sectional imaging
with CT and/or MRI should be followed by 68Ga-DOTATOC
PET in combination with native or preferably 3-phase
contrast-enhanced CT (functional imaging) or if not available
SRS SPECT/CT.
Niederle, 2016, Neuroendocrinology; 2016;103(2):125-38.
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SRS (111In-Pentetreotide) detects more
NET lesions than FDG or MIBG
SRS > FDG >MIBG
Liver MIBG≈FDG
n=96
Binderup, 2010, J Nucl Med; 51(5):704-12
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SRS (111In-Pentetreotide) has higher
sensitivity for NET than FDG or MIBG All NET subtypes, except colonic (FDG>111In-Pentetreotide)
Total Sensitivity
SRS: 89%
MIBG: 52%
FDG: 58%
N=96
For Ki67 >2% and 2%-15%, but not for >15% (FDG>111In-Pentetreotide)
Binderup, 2010, J Nucl Med; 51(5):704-12 41% of grade 1 patients are positive on FDG!
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Semi-quantitative determination of SSR
expression with111In-pentetreotide
Krenning scale
Visual comparison of uptake in tumor versus normal organs
I II III IV
< Liver = Liver > Liver Most intense
Krenning, Somatostatin receptor scintigraphy. In: Nuclear medicine annual. 1995:1-5
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Cold somatostatin analogues can slow tumor
growth… in SSTR scintigraphy + patients
Rinke, 2009, J Clin Oncol; 2009;27:4656-4663
PF
S
SSTR scintigraphy
HR: 0.34
in 73/85 patients (86%)
•Positive: 63/85 (74%; 86% w. scan)
•Negative:10/85 (12%; 14% w. scan)
•Unknown12/85 (14%)
PROMID CLARINET
PF
S
Inclusion criterium: target
lesion grade 2 or higher on
SSTR scintigraphy
(Krenning scale)
100% SSTR positive
Caplin ME, 2014, New Engl J Med; 371:224-233.
HR: 0.47
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SUV of 68Ga-DOTATOC predicts
probability of PRRT response in NETs
Kratochwil C, 2014, Mol Imaging Biol; 17:313-16
Responding
Lesions
Non-
Responding
Lesions
SUVmax: 26.4
SUVmax: 16.5
SU
Vm
ax
Sens: 68%
Spec: 95%
Sens: 95%
Spec: 60%
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NETTER-1
Metastatic NET
(midgut)
• RECIST progression
on fixed dose SSA
• Ki67 <20% (Gr 1/2)
• SRS + (G2-4) all
lesions
• Adequate GFR,
blood, liver
• No prior PRRT
229
1
1
1ary end: PFS
2ary end: ORR, TTP, OS, DoR, PFS2
Stratification
: • Fixed dose SSA: <6
months vs >6 months
• SRS uptake score
PRRT 177Lu-DOTATATE
4 x 7.4GBq; interval 8±1w
30 mg Octreotide LAR/4w
116
60 mg Octreotide LAR/4w
113
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NETTER-1: Prespecified subgroup
analysis
Strosberg, …Van Cutsem, et al., New England Journal of Medicine; 376(2):125-135
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SRS: 68Ga-peptide PET is superior to
conventional scintigraphy (111In-Pentetreotide)
Comparison 111In-Pentetreotide, 68Ga-DOTATOC, CT (n=84)
• Sensitivity:
– 68Ga-DOTATOC 97%
– 111In-Pentetreotide 52%
– CT 61%
• Better performance for small lesions in LN and bone
Gabriel, 2007, J Nucl Med; 48(4):508-18
Comparison 111In-Pentetreotide, 68Ga-DOTATOC, CT (n=27)
• Sensitivity: – 68Ga-DOTATOC 100%
– 111In-Pentetreotide 66%
– CT or MRI 73%
• 68Ga-DOTATOC finds more lesions in lung and bones
Buchmann, 2007, Eur J Nucl Med Mol Imaging;34(10):1617-26 2007
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Author Year n 68Ga-Peptide
Level (Patient/lesion)
Sensitivity 111In-
pentetreotide
Sensitivity 68Ga-
peptide
Δ Sens
Gabriel 2007 84 -TOC Patient 52.0% 97.0% 45.0%
Buchmann 2007 27 -TOC Region 66.0% 100.0% 34.0%
Srirajaskanthan 2010 51 -TATE Lesion 11.9% 74.3% 62.4%
Van Binnebeek 2016 53 -TOC Lesion 60.0% 99.9% 39.9%
Deppen 2016 78 -TATE Patient 72.0% 96.0% 24.0%
Sadowski 2016 131 -TATE Lesion 30.9% 95.1% 64.2%
Morgat* 2016 19 -TOC Lesion 20.0% 76.0% 56.0%
*: MEN-1
TOTAL 443 Range 12-72% 74-100% 24-62%
Gabriel, 2007, J Nucl Med; 48(4):508-18; Buchmann, 2007, Eur J Nucl Med Mol Imaging;34(10):1617-26; Srirajaskanthan, 2010, J Nucl Med; 51:875-82; Van
Binnebeek…Deroose, 2016 Eur Radiol; 26(3):900-9; Deppen, 2016, J Nucl Med; 57: 708-14; Sadowski, 2016, J Clin Oncol; 34(6): 588-96; Morgat, 2016, Eur J Nucl Med Mol
Imaging; 43:1258-66
Comparison of 68Ga-DOTA-peptide
PET vs. 111In-pentetreotide
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Comparison of 68Ga-DOTATATE PET/CT vs. 111In-
pentetreotide SPECT: largest series on record
Sadowski, 2016, J Clin Oncol; 34(6): 588-96
Comparison 111In-Pentetreotide, 68Ga-DOTATATE, CT (n=131)
• Sensitivity: – 68Ga-DOTATATE 95.1%
– 111In-Pentetreotide SPEC/CT 30.9%
– CT 45.3%
• 68Ga-DOTATATE PET/CT induced change in management in 43 of 131 patients (32.8%)
• In patients with carcinoid symptoms and negative biochemical testing: – 68Ga-DOTATATE PET/CT: positive in 65.2%
– 40% of these were anatomic imaging and 111In-pentetreotide SPECT/CT negative
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68Ga-DOTATOC ≈ 68Ga-DOTATATE
• n=40
• Lesions detected: SUVmax
– 68Ga-DOTATOC: 262 20.4 ± 14.7
– 68Ga-DOTATATE: 254 (97%) 16.0 ± 10.8
Poeppel, 2011, J Nucl Med, 52(12):1864-70
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Very similar findings in 68Ga-DOTATOC
vs 68Ga-DOTATATE
DOTATO
68Ga-DOTATATE
68Ga-DOTATOC
Poeppel, 2011, J Nucl Med, 52(12):1864-70
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68Ga-DOTANOC vs 68Ga-DOTATATE
Kabasakal, 2012, Eur J Nucl Med Mol Imaging;39(8):1271-7
Normal Biodistribution
68Ga-DOTANOC 68Ga-DOTATATE
Metastatic NET
68Ga-DOTANOC 68Ga-DOTATATE
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Clinical impact of 68Ga-DOTA-peptide PET/CT
vs 111In-Pentretreotide
• Detection of smaller lesions
• Detection of lesions with only light to moderate SSR
expression
• Detection of more lesions
– No change in therapy
– Change in therapy in substantial fraction of patients e.g.:
• Additional liver metastases change in liver directed therapy
• Extra-hepatic metastases (refrain from SIRS, refrain from liverTx)
• “One stop shop” – 90 minutes door to door, including
diagnostic CT (111In-pentetreotide: 2 day procedure)
• Be careful with direct comparison between 111In-
pentetreotide and 68Ga-DOTA-peptide PET
– More lesions does not necessarily mean clinical progression!
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Differential binding of SSTR agonists
and antagonists
Based on Ginj, 2006, Proc Natl Acad Sci U S A.;103(44):16436-41
SSTR Agonist
Activated receptor state
Bound to GDP
GTP GTP GTP
Inactivated receptor state
Bound to GTP
GDP
GTP
GTP GTP GTP
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Differential binding of SSTR agonists
and antagonists
Based on Ginj, 2006, Proc Natl Acad Sci U S A.;103(44):16436-41
SSTR Agonist
Activated receptor state
Bound to GDP
GTP GTP GTP
Inactivated receptor state
Bound to GTP
SSTR Antagonist
GTP
GTP GTP GTP GDP GDP
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Differential binding of SSTR agonists
and antagonists
Lysosome
Nucleus
Based on Ginj, 2006, Proc Natl Acad Sci U S A.;103(44):16436-41
SSTR Agonist
Activated receptor state
Internalisation
GDP
GTP GTP GTP
GDP GTP GTP GTP
SSTR Antagonist
Lysosome
No Internalisation
GDP
Nucleus
Inactivated receptor state
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Imaging somatostatin receptor
expression with SSTR antagonists
111In-DOTA-BASS
(Antagonist)
Wild, 2011, J Nucl Med; 52(9):1412-7
111In-pentetreotide (Octreoscan®)
(Agonist)
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Pitfall: increased physiological uptake in
pancreatic head and uncinate process
MIP CORONAL
No Whipple without cytological or morphological imaging confirmation
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Pitfall: SSR expression on
meningeoma (68Ga-DOTATATE)
Pancreatic head!
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Pitfall: inflammatory uptake in degenerative
osteoarthritis (68Ga-DOTATATE)
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Pitfall: Accesorry spleen and probable intrapancreatic
accessory spleen on 68Ga-DOTATOC
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Peptide Receptors – Glucagon-like
peptide 1 receptor (GLP-1R)
Nucleus
Secretory
vesicle
99mTc-DMSA
11C-5-HTP
18F-DOPA
123I-IMT
Phosphate
metabolism
Serotonin pathway
Catecholamine pathway IMT
Secretory
vesicle
18F-Dopamine
123I-MIBG 18F-FDG
Glucose metabolism
Passive diffusion
Active transport
Receptor/ligand internalisation
LAT1 amino acid
transporter
Noradrenaline
transporter
NaPi
co-transporter
GLUT glucose
transporter
VMAT transporter
Peptide
receptors
Lysosome
Somatostatin
receptor
Bombesin
receptor
CCK receptor
VIP receptor
GLP1 receptor
Receptor-based
Adapted from Koopmans, Crit Rev Oncol Hematol, 2009; 71(3):199-213
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Glucagon-like peptide 1 receptor (GLP-1R)
ligands for SPECT
• Receptors for glucagon-like peptide 1 (GLP-1) are
highly overexpressed in almost all insulinomas
• [Lys40(Ahx-DTPA-111In)NH2]exendin-4 pre-clinically
validated tracer (RIP-Tag mouse model)
HE Autoradiography Blocked
Autoradiography
100 nmol/L GLP
Reubi, 2003, Eur J Nucl Med Mol Imaging;30(5):781-93
Korner, 2007, J Nucl Med;48(5):736-43
Wild, 2006, J Nucl Med;47(12):2025-33
Mouse SPECT/CT
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Glucagon-like peptide 1 receptor (GLP-1R)
ligands for SPECT
Man, 64 year
Neuroglycopenia
Endogenous
hyperinsulinism
SPECT/CT: small
nodule between the
duodenum and the
superior mesenteric
artery
4 h PI 4 days PI
T/B:5.8 T/B:13.4 Tumor
Autoradiography Control
Autoradiography
SPECT/CT
Wild, 2008, New Engl J Med; 359(7):766-8
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Glucagon-like peptide 1 receptors (GLP-1R)
ligands for PET (68Ga-DOTA-exendin-4)
Antwi…Wild, 2015, J Nucl Med;56:1075–1078
PET
SPECT
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MOLECULAR IMAGING IN NET 18F-FDG
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Glucose Metabolism – 18F-FDG
Lysosome
Nucleus
Secretory
vesicle
99mTc-DMSA
11C-5-HTP
18F-DOPA
123I-IMT
5-
HTP
Phosphate
metabolism
Secretory
vesicle
Secretory
vesicle
Serotonin pathway
Catecholamine pathway IMT
Secretory
vesicle
18F-Dopamine
123I-MIBG 18F-FDG
Glucose metabolism
Adapted from Koopmans, Crit Rev Oncol/Hem, 2009
Passive diffusion
Active transport
Receptor/ligand internalisation
LAT1 amino acid
transporter
Noradrenaline
transporter
NaPi
co-transporter
VMAT transporter
Somatostatin
receptor
Bombesin
receptor
CCK receptor
VIP receptor
GLP1 receptor
Peptide
receptors
GLUT glucose
transporter
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Differentiation MORE LESS
Ki67 index LOW HIGH
Mitoses LOW HIGH
Biological aggressiveness LOW HIGH
Patient prognosis GOOD POOR
SSTR expression HIGH LOW
18F-FDG LOW HIGH
INDOLENT AGRESSIVE
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2-[18F]fluoro-2-deoxy-D-glucose vs.
D-Glucose
• FDG = Glucose
– Transported by GLUT receptors
• Brain
• Myocardium – Skeletal muscle
• Tumoral cells
• Inflammatory cells (activated neutrophils, macrofages)
• Bowel (small intestine, colon)
– Phosphorylation by hexokinase
• FDG ≠ Glucose
– No isomerisation by phosphohexose isomerase
– No substrate for SGLT (active renal tubular transporter)
renal clearance
FDG Glucose
F
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Contribution of 18F-FDG PET(/CT)
imaging for GEP-NETs
• Sensitive detection of tumoral lesions, including small lesions (G3): – Staging
– Suspicion of recurrence
– Restaging
– Therapy monitoring
• Molecular characterization of tumoral lesions: – Prognostic biomaker
– Guidance for (re-)biopsy incase of clinical/morphological progression.
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SRS (111In-Pentetreotide) has higher
sensitivity for NET than FDG or MIBG All NET subtypes, except colonic (FDG>111In-Pentetreotide)
Total Sensitivity
SRS: 89%
MIBG: 52%
FDG: 58%
N=96
For Ki67 >2% and 2%-15%, but not for >15% (FDG>111In-Pentetreotide)
Binderup, 2010, J Nucl Med; 51(5):704-12 41% of grade 1 patients are positive on FDG!
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18F-FDG PET detects patients with
poor prognosis
OS PFS
Binderup, 2010, Clin Cancer Res;16(3):978-85
FDG -
FDG +
N=98
Sensitivity for FDG: 58%
Determines biological properties
FDG -
FDG +
Hazard Ratio: 9.4 Hazard Ratio: 10.3
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Metabolic grading of NET with 18F-FDG
Ezzidin, 2014, J Nucl Med;55(8):1260-6
T/L:Tumor/Liver
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mG1 mG2 mG3
Ki67:10% Ki67:1% Ki67:20%
Metabolic grading of NET with 18F-FDG
Ezzidin, 2014, J Nucl Med;55(8):1260-6
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Metabolic grading of NET with 18F-FDG
Metabolic grading Pathological grading
Ezzidin, 2014, J Nucl Med;55(8):1260-6
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Radiolabelled Neurotransmitter Precursors
Lysosome
Nucleus
Secretory
vesicle
99mTc-DMSA
11C-5-HTP
18F-DOPA
123I-IMT
5-
HTP
Phosphate
metabolism
Secretory
vesicle
Secretory
vesicle
Serotonin pathway
Catecholamine pathway IMT
18F-Dopamine
123I-MIBG 18F-FDG
Glucose metabolism
Passive diffusion
Active transport
Receptor/ligand internalisation
Noradrenaline
transporter
NaPi
co-transporter
GLUT glucose
transporter
Somatostatin
receptor
Bombesin
receptor
CCK receptor
VIP receptor
GLP1 receptor
Peptide
receptors
Secretory
vesicle
LAT1 amino
acid transporter
VMAT transporter
Adapted from Koopmans, Crit Rev Oncol Hematol, 2009; 71(3):199-213
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18F-FDOPA:
6-L-18F-Fluorodihydroxyphenylalanine
Jager, JNM 2008
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18F-DOPA metabolism
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Diagnostic accuracy of 18F-DOPA
18F-DOPA Planar SRS
18F-DOPA biodistribution: striatum,
kidney, ureter, bladder
PET/CT
Koopmans, Lancet Oncol, 2006
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Diagnostic accuracy of 18F-DOPA in
patients with carcinoid tumors: lesion base
Koopmans, Lancet Oncol, 2006
Sensitivity for all studied sites is better for 18F-DOPA than SRS
or than CT, except for lung (55% vs. 64% SRS+CT)
Parameter 18F-DOPA SRS CT SRS+CT
Sensitivity 96% 46% 54% 65%
95% CI (95-98%) (43-50%) (51-58%) (62-69%)
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18F-DOPA: normal biodistribution
Jager, JNM 2008
•Carbidopa pretreatment
•Major uptake in
•kidneys
•ureter
•bladder
•Minor uptake in
•striatum
•myocardium
•liver
•muscles
•Note absence of pancreatic
uptake
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18F-DOPA: pathological uptake in NET
Jager, JNM 2008
•Carbidopa pretreatment
•Carcinoid in several
locations
•abdomen
•liver
•mediastinum
•Intense uptake
•Detection of small lesions
•Absence of pancreatic
uptake.
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18F-DOPA: pathological uptake in
pancreatic islet NET
Jager, JNM 2008
•Carbidopa pretreatment
•Primary malignant islet cell
tumor located in tail of pancreas
(blue arrow)
•Several liver metastases (red
arrows)
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11C-5-HTP, a serotonergic metabolic tracer
for NET
Koopmans, JCO 2008
CT SRS 18F-DOPA 11C-5-HTP
11C-HTP>>18F-DOPA>SRS=CT
18F-DOPA PET/CT SRS 18F-DOPA 11C-5-HTP
11C-HTP=18F-DOPA>SRS
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11C-5-HTP, a serotonergic metabolic tracer
for NET
Koopmans, JCO 2008
Technique Sensitivity 95% CI
CT 68% 63 - 74
SRS (111In-Octreotide)
46% 40 - 52
SRS + CT 77% 72 - 82
18F-DOPA 41% 36 - 47
18F-DOPA + CT 80% 75 - 85
11C-5-HTP 67% 62 - 73
11C-5-HTP + CT 96% 93 - 98
N=294 lesions
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Radiolabeled Catecholamines
Lysosome
Nucleus
99mTc-DMSA
11C-5-HTP
18F-DOPA
123I-IMT
Phosphate
metabolism
Serotonin pathway
Catecholamine pathway IMT
Secretory
vesicle
18F-Dopamine
123I-MIBG 18F-FDG
Glucose metabolism
Passive diffusion
Active transport
Receptor/ligand internalisation
LAT1 amino acid
transporter
NaPi
co-transporter
GLUT glucose
transporter
VMAT transporter
Somatostatin
receptor
Bombesin
receptor
CCK receptor
VIP receptor
GLP1 receptor
Peptide
receptors
Secretory
vesicle
Noradrenaline
transporter
Adapted from Koopmans, Crit Rev Oncol Hematol, 2009; 71(3):199-213
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C
NH OH
OH
C C NH2
OH H
H H
C N NH2
I
noradrenaline MIBG
University of Michigan Medical School, 1980
Guanethidine derivative – Mimicks Norepinephrine
(NE) 131I or 123I label
Uptake: (a) Active (type I)
(b) Passive
neuroendocrine tumors
H
H H
meta-IodoBenzylGuanidine
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Catecholamine radiopharmaceuticals
• 131I-MIBG: – Low specific activity
– Physically infavourable characteristics for imaging
– 123I-MIBG: – High specific activity
– Physically more favourable
– Photon energy: 159 keV vs 364 keV
– T1/2: 13 hours vs 192 hours
– No beta emission
– -> reduced dosimetry, increased sensitivity, allows SPECT
– Negative: Cost
– 124I-MIBG: – PET imaging
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Cellular uptake of MIBG - General
1
2
3
4
5
1: Uptake 1, 2: Passive diffusion, 3: Intracellular transport
4: Storage in granules, 5: Release from cell.
ATP dependent
Reserpine sensitive
Cytoplasmic structures
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Cellular uptake of MIBG - NET
1
2
3
4
5
1: Uptake 1, 2: Passive diffusion, 3: Intracellular transport
4: Storage in granules, 5: Release from cell.
ATP dependent
Reserpine sensitive
Cytoplasmic structures
Norepinephrin transporter (abbreviation: NET)
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Sensitivity of MIBG for NET
Koopmans, Crit Rev Oncol/Hem, 2009
Binderup, JNM, 2010
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Outcomee Toxicity
N=31 Ezzidin S. et al., J Nucl Med, 2013; 54:2032-8
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• 18F-FDG
• First choice in patients with grade 3 NET for determination of tumor extent
• Offers prognostic information in patients with grade 1 or 2 NET
• Metabolic grading in metastatic patients?
• 18F-DOPA/11C-5-HTP/18F-Dopamine: other techniques inconclusive
Take Home Messages
• SSTR scintigraphy or PET – Sensitivity > 90% compared to conventional techniques
– Is part of standard management in a large fraction of NET patients • Time of diagnosis
• During follow-up
– First choice in patients with grade 1 or 2 NET
– Can be useful in isolated tumor marker rise (chromogranin, 5-HIAA)
– 111In-Pentetreotide: not gold standard (use of SPECT/CT strongly advised)
– 68Ga-DOTA-peptides are the best tracers, should be used when available
– Pitfalls: uncinate process, other tumors (e.g. meningeoma), spleen, inflammation
– Antagonists next step
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Take Home messages
SSR as theranostic target
FDG is gold standard for NET G3 and has prognostic value in
G1/2
SSR imaging, preferentially with PET, is current gold
standard for NET (G1/2) imaging
SSR expression can be (semi-)quantitatively scored
Predictive value for cold SSA treatment (Clarinet > Promid)
Very strong predictive value for SSR-targeting radionuclide
treatment (PRRT)
GLP-1 PET ligands best imaging agents for benign insulinoma
Other tracers (18F-DOPA/11C-5-HTP/18F-Dopamine) can be
considered to localize (biochemicaly) suspected NET (e.g.
ACTH producing tumor)
.
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Henry N. Wagner Jr
1927 - 2012
“Forefather of Nuclear Medicine”
“The future of nuclear
medicine is PET….
…and Therapy”
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Questions?
Leuven City Hall