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EJNMMI Research

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https://www.readbyqxmd.com/read/28102507/-44-sc-psma-617-for-radiotheragnostics-in-tandem-with-177-lu-psma-617-preclinical-investigations-in-comparison-with-68-ga-psma-11-and-68-ga-psma-617
#1
Christoph A Umbricht, Martina Benešová, Raffaella M Schmid, Andreas Türler, Roger Schibli, Nicholas P van der Meulen, Cristina Müller
BACKGROUND: The targeting of the prostate-specific membrane antigen (PSMA) is of particular interest for radiotheragnostic purposes of prostate cancer. Radiolabeled PSMA-617, a 1,4,7,10-tetraazacyclododecane-N,N',N'',N'''-tetraacetic acid (DOTA)-functionalized PSMA ligand, revealed favorable kinetics with high tumor uptake, enabling its successful application for PET imaging ((68)Ga) and radionuclide therapy ((177)Lu) in the clinics. In this study, PSMA-617 was labeled with cyclotron-produced (44)Sc (T 1/2 = 4...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28102506/a-comparison-of-flt-to-fdg-pet-ct-in-the-early-assessment-of-chemotherapy-response-in-stages-ib-iiia-resectable-nsclc
#2
John P Crandall, Abdel K Tahari, Rosalyn A Juergens, Julie R Brahmer, Charles M Rudin, Giuseppe Esposito, Deepa S Subramaniam, Michael V Knopp, Nathan C Hall, Prateek Gajwani, Jeffrey P Leal, Martin A Lodge, Joo H O, Edward W Gabrielson, Lalitha K Shankar, Richard L Wahl
BACKGROUND: The aim of this study was to compare the percentage change in (18)F-fluorothymidine (FLT) standard uptake value (SUV) between baseline and after one cycle of chemotherapy in patients categorized by RECIST 1.1 computed tomography (CT) as responders or non-responders after two cycles of therapy. Change in (18)F-fluorodeoxyglucose (FDG) uptake was also compared between these time points. Nine patients with newly diagnosed, operable, non-small cell lung cancer (NSCLC) were imaged with FDG positron emission tomography/CT (PET), FLT PET/CT, and CT at baseline, following one cycle of neoadjuvant therapy (75 mg/m(2) docetaxel + 75 mg/m(2) cisplatin), and again after the second cycle of therapy...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28101850/assessment-of-regional-pulmonary-blood-flow-using-68-ga-dota-pet
#3
Carlos Velasco, Jesus Mateo, Arnoldo Santos, Adriana Mota-Cobian, Fernando Herranz, Juan Pellico, Ruben A Mota, Samuel España, Jesus Ruiz-Cabello
BACKGROUND: In vivo determination of regional pulmonary blood flow (PBF) is a valuable tool for the evaluation of many lung diseases. In this study, the use of (68)Ga-DOTA PET for the in vivo quantitative determination of regional PBF is proposed. This methodology was implemented and tested in healthy pigs and validated using fluorescent microspheres. The study was performed on young large white pigs (n = 4). To assess the reproducibility and consistency of the method, three PET scans were obtained for each animal...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28097640/priming-increases-the-anti-tumor-effect-and-therapeutic-window-of-177-lu-octreotate-in-nude-mice-bearing-human-small-intestine-neuroendocrine-tumor-got1
#4
Johanna Dalmo, Johan Spetz, Mikael Montelius, Britta Langen, Yvonne Arvidsson, Henrik Johansson, Toshima Z Parris, Khalil Helou, Bo Wängberg, Ola Nilsson, Maria Ljungberg, Eva Forssell-Aronsson
BACKGROUND: (177)Lu-[DOTA(0), Tyr(3)]-octreotate ((177)Lu-octreotate) is used for treatment of patients with somatostatin receptor (SSTR) expressing neuroendocrine tumors. However, complete tumor remission is rarely seen, and optimization of treatment protocols is needed. In vitro studies have shown that irradiation can up-regulate the expression of SSTR1, 2 and 5, and increase (177)Lu-octreotate uptake. The aim of the present study was to examine the anti-tumor effect of a (177)Lu-octreotate priming dose followed 24 h later by a second injection of (177)Lu-octreotate compared to a single administration of (177)Lu-octreotate, performed on the human small intestine neuroendocrine tumor cell line, GOT1, transplanted to nude mice...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28091980/comparison-of-tc-99m-maraciclatide-and-tc-99m-sestamibi-molecular-breast-imaging-in-patients-with-suspected-breast-cancer
#5
Michael K O'Connor, Melissa M B Morrow, Katie N Hunt, Judy C Boughey, Dietlind L Wahner-Roedler, Amy Lynn Conners, Deborah J Rhodes, Carrie B Hruska
BACKGROUND: Molecular breast imaging (MBI) performed with (99m)Tc sestamibi has been shown to be a valuable technique for the detection of breast cancer. Alternative radiotracers such as (99m)Tc maraciclatide may offer improved uptake in breast lesions. The purpose of this study was to compare relative performance of (99m)Tc sestamibi and (99m)Tc maraciclatide in patients with suspected breast cancer, using a high-resolution dedicated gamma camera for MBI. Women with breast lesions suspicious for malignancy were recruited to undergo two MBI examinations-one with (99m)Tc sestamibi and one with (99m)Tc maraciclatide...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28091979/blood-perfusion-in-osteomyelitis-studied-with-15-o-water-pet-in-a-juvenile-porcine-model
#6
Lars Jødal, Ole L Nielsen, Pia Afzelius, Aage K O Alstrup, Søren B Hansen
BACKGROUND: Osteomyelitis is a serious disease which can be difficult to treat despite properly instituted antibiotic therapy. This appears to be related at least partly to degraded vascularisation in the osteomyelitic (OM) lesions. Studies of perfusion in OM bones are, however, few and not quantitative. Quantitative assessment of perfusion could aid in the selection of therapy. A non-invasive, quantitative way to study perfusion is dynamic [(15)O]water positron emission tomography (PET)...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28091978/patient-specific-optimisation-of-administered-activity-and-acquisition-times-for-18-f-fdg-pet-imaging
#7
Fred Wickham, Helena McMeekin, Maria Burniston, Daniel McCool, Deborah Pencharz, Annah Skillen, Thomas Wagner
BACKGROUND: The purpose of this study is to identify a method for optimising the administered activity and acquisition time for (18)F-FDG PET imaging, yielding images of consistent quality for patients with varying body sizes and compositions, while limiting radiation doses to patients and staff. Patients referred for FDG scans had bioimpedance measurements. They were injected with 3 MBq/kg of (18)F up to 370 MBq and scanned on a Siemens Biograph mCT at 3 or 4 min per bed position...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28058660/hepatobiliary-scintigraphy-may-improve-radioembolization-treatment-planning-in-hcc-patients
#8
Manon N G J A Braat, Hugo W de Jong, Beatrijs A Seinstra, Mike V Scholten, Maurice A A J van den Bosch, Marnix G E H Lam
BACKGROUND: Routine work-up for transarterial radioembolization, based on clinical and laboratory parameters, sometimes fails, resulting in severe hepatotoxicity in up to 5% of patients. Quantitative assessment of the pretreatment liver function and its segmental distribution, using hepatobiliary scintigraphy may improve patient selection and treatment planning. A case series will be presented to illustrate the potential of this technique. Hepatocellular carcinoma patients with cirrhosis (Child-Pugh A and B) underwent hepatobiliary scintigraphy pre- and 3 months post-radioembolization as part of a prospective study protocol, which was prematurely terminated because of limited accrual...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28058659/three-minute-spect-ct-is-sufficient-for-the-assessment-of-bone-metastasis-as-add-on-to-planar-bone-scintigraphy-prospective-head-to-head-comparison-to-11-min-spect-ct
#9
Helle D Zacho, José A Biurrun Manresa, Ramune Aleksyniene, June A Ejlersen, Joan Fledelius, Henrik Bertelsen, Lars J Petersen
BACKGROUND: The aim of this study is to assess whether ultra-fast acquisition SPECT/CT (UF-SPECT/CT) can replace standard SPECT/CT (std-SPECT/CT) as "add-on" to whole-body bone scintigraphy (WB-BS) for the investigation of bone metastases. Consecutive cancer patients referred for WB-BS who underwent SPECT/CT in addition to WB-BS were included. Std-SPECT, UF-SPECT, and low-dose CT were performed (std-SPECT: matrix 128 × 128, zoom factor 1, 20 s/view, 32 views; UF-SPECT: identical parameters except for 10 s/view and 16 views, reducing the acquisition time from 11 to 3 min)...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28004357/yttrium-90-radioembolization-for-colorectal-cancer-liver-metastases-a-prospective-cohort-study-on-circulating-angiogenic-factors-and-treatment-response
#10
C E N M Rosenbaum, A F van den Hoven, M N G J A Braat, M Koopman, M G E H Lam, B A Zonnenberg, H M Verkooijen, M A A J van den Bosch
BACKGROUND: Yttrium-90 radioembolization ((90)Y-RE) as a treatment for liver tumours induces radiation damage and hypoxia in liver tissue, which is also a trigger for systemic release of angiogenic factors, potentially stimulating tumour growth. We examined changes in circulating angiogenic factors following (90)Y-RE and investigated the association between response and angiogenic factors. In this prospective study, 42 patients with unresectable, chemorefractory metastatic colorectal cancer (CRCLM) were treated with (90)Y-RE...
December 2016: EJNMMI Research
https://www.readbyqxmd.com/read/27957723/low-kidney-uptake-of-glp-1r-targeting-beta-cell-specific-pet-tracer-18-f-labeled-nle-14-lys-40-exendin-4-analog-shows-promise-for-clinical-imaging
#11
Kirsi Mikkola, Cheng-Bin Yim, Paula Lehtiniemi, Saila Kauhanen, Miikka Tarkia, Tuula Tolvanen, Pirjo Nuutila, Olof Solin
BACKGROUND: Several radiometal-labeled, exendin-based tracers that target glucagon-like peptide-1 receptors (GLP-1R) have been intensively explored for β cell imaging. The main obstacle has been the high uptake of tracer in the kidneys. This study aimed to develop a novel GLP1-R-specific tracer, with fluorine-18 attached to exendin-4, to label β cells for clinical imaging with PET (positron emission tomography). We hypothesized that this tracer would undergo reduced kidney uptake. (18)F-labeled [Nle(14),Lys(40)]exendin-4 analog ([(18)F]exendin-4) was produced via Cu-catalyzed click chemistry...
December 2016: EJNMMI Research
https://www.readbyqxmd.com/read/27957722/dynamic-pet-evaluation-of-elevated-flt-level-after-sorafenib-treatment-in-mice-bearing-human-renal-cell-carcinoma-xenograft
#12
Naoyuki Ukon, Songji Zhao, Wenwen Yu, Yoichi Shimizu, Ken-Ichi Nishijima, Naoki Kubo, Yoshimasa Kitagawa, Nagara Tamaki, Kei Higashikawa, Hironobu Yasui, Yuji Kuge
BACKGROUND: Sorafenib, an oral multikinase inhibitor, has anti-proliferative and anti-angiogenic activities and is therapeutically effective against renal cell carcinoma (RCC). Recently, we have evaluated the tumor responses to sorafenib treatment in a RCC xenograft using [Methyl-(3)H(N)]-3'-fluoro-3'-deoxythythymidine ([(3)H]FLT). Contrary to our expectation, the FLT level in the tumor significantly increased after the treatment. In this study, to clarify the reason for the elevated FLT level, dynamic 3'-[(18)F]fluoro-3'-deoxythymidine ([(18)F]FLT) positron emission tomography (PET) and kinetic studies were performed in mice bearing a RCC xenograft (A498)...
December 2016: EJNMMI Research
https://www.readbyqxmd.com/read/27957721/computational-simulation-of-the-predicted-dosimetric-impact-of-adjuvant-yttrium-90-pet-ct-guided-percutaneous-ablation-following-radioembolization
#13
Alexander S Pasciak, Abigail Lin, Christos Georgiades, Laura K Findeiss, Shannon Kauffman, Yong C Bradley
BACKGROUND: (90)Y PET/CT post-radioembolization imaging has demonstrated that the distribution of (90)Y in a tumor can be non-uniform. Using computational modeling, we predicted the dosimetric impact of post-treatment (90)Y PET/CT-guided percutaneous ablation of the portions of a tumor receiving the lowest absorbed dose. A cohort of fourteen patients with non-resectable liver cancer previously treated using (90)Y radioembolization were included in this retrospective study. Each patient exhibited potentially under-treated areas of tumor following treatment based on quantitative (90)Y PET/CT...
December 2016: EJNMMI Research
https://www.readbyqxmd.com/read/27957720/-99m-tc-labelled-s-hynic-certolizumab-pegol-in-rheumatoid-arthritis-and-spondyloarthritis-patients-a-biodistribution-and-dosimetry-study
#14
Bieke Lambert, Philippe Carron, Yves D'Asseler, Klaus Bacher, Filip Van den Bosch, Dirk Elewaut, Gust Verbruggen, Rudi Beyaert, Caroline Dumolyn, Filip De Vos
BACKGROUND: Biologicals directed against tumour necrosis factor (TNF) have proven their efficacy in the treatment of spondyloarthritis and rheumatoid arthritis. We present a radiolabelling method for certolizumab pegol (CZP), a commercially available humanized Fab'-fragment directed against TNF. A biodistribution and dosimetry study was conducted. Tc-S-HYNIC CZP was synthesized. The in vitro TNF neutralizing activity was tested by exposing L929s-cells to various concentrations 99mTc-S-HYNIC CZP and measuring TNF-induced cytotoxicity...
December 2016: EJNMMI Research
https://www.readbyqxmd.com/read/27896673/the-clinical-safety-biodistribution-and-internal-radiation-dosimetry-of-18-f-ah113804-in-healthy-adult-volunteers
#15
E J Somer, R Owenius, A Wall, G Antoni, A Thibblin, J Sörensen
BACKGROUND: Quantitative biodistribution, venous blood and excretion data have been obtained following the intravenous bolus injection of AH113804 ((18)F) Injection in six healthy volunteers (HVs), four males and two females, up to approximately 5 h post-injection. For each subject, key organs and tissues were delineated and analytical fits were made to the image data as functions of time to yield the normalised cumulated activities. These were input to an internal radiation dosimetry calculation based upon the Medical Internal Radiation Dose (MIRD) schema for the Cristy-Eckerman adult male or female phantom...
December 2016: EJNMMI Research
https://www.readbyqxmd.com/read/27888500/the-effect-of-isoflurane-on-18-f-fdg-uptake-in-the-rat-brain-a-fully-conscious-dynamic-pet-study-using-motion-compensation
#16
Matthew G Spangler-Bickell, Bart de Laat, Roger Fulton, Guy Bormans, Johan Nuyts
BACKGROUND: In preclinical positron emission tomography (PET) studies an anaesthetic is used to ensure that the animal does not move during the scan. However, anaesthesia may have confounding effects on the drug or tracer kinetics under study, and the nature of these effects is usually not known. METHOD: We have implemented a protocol for tracking the rigid motion of the head of a fully conscious rat during a PET scan and performing a motion compensated list-mode reconstruction of the data...
December 2016: EJNMMI Research
https://www.readbyqxmd.com/read/27885618/pre-clinical-quantitative-imaging-and-mouse-specific-dosimetry-for-111-in-labelled-radiotracers
#17
Ana M Denis-Bacelar, Sarah E Cronin, Chiara Da Pieve, Rowena L Paul, Sue A Eccles, Terence J Spinks, Carol Box, Adrian Hall, Jane K Sosabowski, Gabriela Kramer-Marek, Glenn D Flux
BACKGROUND: Accurate quantification in molecular imaging is essential to improve the assessment of novel drugs and compare the radiobiological effects of therapeutic agents prior to in-human studies. The aim of this study was to investigate the challenges and feasibility of pre-clinical quantitative imaging and mouse-specific dosimetry of (111)In-labelled radiotracers. Attenuation, scatter and partial volume effects were studied using phantom experiments, and an activity calibration curve was obtained for varying sphere sizes...
December 2016: EJNMMI Research
https://www.readbyqxmd.com/read/27873241/predictive-factors-of-18-f-choline-pet-ct-positivity-in-patients-with-prostate-cancer-recurrence-after-radiation-therapy-is-the-impact-of-psa-nadir-underestimated
#18
Alison C Johnson, Audrey Emmanuelle Dugué, Marlon Silva, Laura Moise, Xavier Tillou, Florence Joly, Nicolas Aide
BACKGROUND: The objective of this study is to explore the impact of PSA nadirs on detection rates of prostate cancer (PCa) recurrence with (18)F-choline (CH) PET/CT after external beam radiation therapy (EBRT). METHODS: In this retrospective study, data were collected from 54 patients with suspicion of PCa biochemical recurrence after EBRT (28 patients treated initially with EBRT and 26 as salvage therapy in the absence of PSA decrease after initial treatment), who underwent (18)F-CH PET/CT between 2010 and 2015...
December 2016: EJNMMI Research
https://www.readbyqxmd.com/read/27873240/improved-safety-and-efficacy-of-213-bi-dotatate-targeted-alpha-therapy-of-somatostatin-receptor-expressing-neuroendocrine-tumors-in-mice-pre-treated-with-l-lysine
#19
Ho Sze Chan, Mark W Konijnenberg, Tamara Daniels, Monique Nysus, Mehran Makvandi, Erik de Blois, Wouter A Breeman, Robert W Atcher, Marion de Jong, Jeffrey P Norenberg
BACKGROUND: Targeted alpha therapy (TAT) offers advantages over current β-emitting conjugates for peptide receptor radionuclide therapy (PRRT) of neuroendocrine tumors. PRRT with (177)Lu-DOTATATE or (90)Y-DOTATOC has shown dose-limiting nephrotoxicity due to radiopeptide retention in the proximal tubules. Pharmacological protection can reduce renal uptake of radiopeptides, e.g., positively charged amino acids, to saturate in the proximal tubules, thereby enabling higher radioactivity to be safely administered...
December 2016: EJNMMI Research
https://www.readbyqxmd.com/read/27873239/effects-of-acetaminophen-on-mitochondrial-complex-i-activity-in-the-rat-liver-and-kidney-a-pet-study-with-18-f-bcpp-bf
#20
Hiroyuki Ohba, Masakatsu Kanazawa, Takeharu Kakiuchi, Hideo Tsukada
BACKGROUND: In the present study, 2-tert-butyl-4-chloro-5-[6-(4-(18)F-fluorobutoxy)-pyridin-3-ylmethoxy]-2H-pyridazin-3-one ((18)F-BCPP-BF), a PET probe for mitochondrial complex I (MC-I), was used to validate whether MC-I is a useful biomarker for detecting acetaminophen-induced dysfunctions in the liver and kidney. The kinetic and distribution of (18)F-BCPP-BF were assessed in rats using high-resolution animal PET in vivo. The binding specificity of (18)F-BCPP-BF to MC-I in the liver and kidney was confirmed by the pre-administration of rotenone, a specific MC-I inhibitor...
December 2016: EJNMMI Research
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