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https://www.readbyqxmd.com/read/28732021/in-vitro-comparison-of-213bi-and-177lu-radiation-for-peptide-receptor-radionuclide-therapy
#1
Ho Sze Chan, Erik de Blois, Alfred Morgenstern, Frank Bruchertseifer, Marion de Jong, Wouter Breeman, Mark Konijnenberg
BACKGROUND: Absorbed doses for α-emitters are different from those for β-emitters, as the high linear energy transfer (LET) nature of α-particles results in a very dense energy deposition over a relatively short path length near the point of emission. This highly localized and therefore high energy deposition can lead to enhanced cell-killing effects at absorbed doses that are non-lethal in low-LET type of exposure. Affinities of DOTA-DPhe1-Tyr3-octreotate (DOTATATE), 115In-DOTATATE, 175Lu-DOTATATE and 209Bi-DOTATATE were determined in the K562-SST2 cell line...
2017: PloS One
https://www.readbyqxmd.com/read/28729680/the-use-of-radiocobalt-as-a-label-improves-imaging-of-egfr-using-dota-conjugated-affibody-molecule
#2
Javad Garousi, Ken G Andersson, Johan H Dam, Birgitte B Olsen, Bogdan Mitran, Anna Orlova, Jos Buijs, Stefan Ståhl, John Löfblom, Helge Thisgaard, Vladimir Tolmachev
Several anti-cancer therapies target the epidermal growth factor receptor (EGFR). Radionuclide imaging of EGFR expression in tumours may aid in selection of optimal cancer therapy. The (111)In-labelled DOTA-conjugated ZEGFR:2377 Affibody molecule was successfully used for imaging of EGFR-expressing xenografts in mice. An optimal combination of radionuclide, chelator and targeting protein may further improve the contrast of radionuclide imaging. The aim of this study was to evaluate the targeting properties of radiocobalt-labelled DOTA-ZEGFR:2377...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28726679/accuracy-of-rhenium-188-spect-ct-activity-quantification-for-applications-in-radionuclide-therapy-using-clinical-reconstruction-methods
#3
Pedro L Esquinas, Carlos F Uribe, M Gonzalez, Cristina Rodríguez-Rodríguez, Urs O Häfeli, Anna Celler
The main applications of (188)Re in radionuclide therapies include trans-arterial liver radioembolization and palliation of painful bone-metastases. In order to optimize (188)Re therapies, the accurate determination of radiation dose delivered to tumors and organs at risk is required. Single photon emission computed tomography (SPECT) can be used to perform such dosimetry calculations. However, the accuracy of dosimetry estimates strongly depends on the accuracy of activity quantification in (188)Re images...
July 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28725249/two-years-results-of-electronic-brachytherapy-for-basal-cell-carcinoma
#4
Rosa Ballester-Sánchez, Olga Pons-Llanas, Cristian Candela-Juan, Blanca de Unamuno-Bustos, Francisco Javier Celada-Alvarez, Alejandro Tormo-Mico, Jose Perez-Calatayud, Rafael Botella-Estrada
PURPOSE: The use of radiation therapy (RT) for non-melanoma skin cancer (NMSC) has been changing throughout the last century. Over the last decades, the use of radiotherapy has surged with the development of new techniques, applicators, and devices. In recent years, electronic brachytherapy (eBT) devices that use small x-ray sources have been introduced as alternative to radionuclide dependence. Nowadays, several devices have been incorporated, with a few series reported, and with a short follow-up, due to the recent introduction of these systems...
June 2017: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/28718084/pancreatic-neuroendocrine-tumor-producing-insulin-and-vasopressin
#5
Omalkhaire M Alshaikh, Ju-Yoon Yoon, Bryan A Chan, Monika K Krzyzanowska, Jagdish Butany, Sylvia L Asa, Shereen Ezzat
The objective of the study is to report a rare case of pancreatic neuroendocrine tumor (pNET) producing insulin and vasopressin. We describe the clinical presentation and management of a metastatic pNET with refractory hypoglycemia and progressive severe hyponatremia. A 52-year-old patient had abdominal pain leading to the diagnosis of a tumor that was initially presumed to be splenic in origin. Investigations ultimately identified a pancreatic mass that on biopsy proved to be a pNET. Eventually, he developed extensive liver metastases, and with tumor progression, he manifested hypoglycemia and severe hyponatremia...
July 17, 2017: Endocrine Pathology
https://www.readbyqxmd.com/read/28713102/-contemporary-use-of-radiosynoviorthesis-in-chronic-polyarthrtitis
#6
Robert Zwolak, Maria Majdan
Radiosynoviorthesis is used for local treatment of recurrent joint effusions, leads to necrosis of inflamed synovium due to beta radiation energy served after intraarticular radionuclide administration. The aim of the therapy is destruction and fibrosis of abnormal, hypertrophic synovial membrane and then full recovery of its normal function after local corticosteroids and systemic modifying drugs failure. Radiosynoviorthesis is effective in different type of peripheral arthritis like rheumatoid arthritis, inflammatory spondyloarthtropaties, gout, chondrocalcinosis, pigmented villo-nodular synovitis, recurrent knee effusion after total joint replacement, idiopathic knee joint effusion, osteoarthritis and secondary prevention of intraarticular bleeding in haemophilia...
2017: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/28705090/the-safety-of-available-treatments-options-for-neuroendocrine-tumors
#7
A Faggiano, F Lo Calzo, G Pizza, R Modica, A Colao
Neuroendocrine neoplasms (NEN) represent a heterogeneous group of malignancies generally characterized by low proliferation and indolent course. However, about half of the newly diagnosed cases are metastatic and require long-term systemic therapies. Areas covered: this review revise the literature to summarize the current knowledge upon safety of all systemic treatment options available. A total amount of 33 different clinical studies have been considered, including 4 on somatostatin analogues (SSA), 5 on targeted therapies, 10 on peptide receptor radionuclide therapy (PRRT), and 14 on chemotherapy...
July 14, 2017: Expert Opinion on Drug Safety
https://www.readbyqxmd.com/read/28703340/core-satellite-polydopamine-gadolinium-metallofullerene-nanotheranostics-for-multimodal-imaging-guided-combination-cancer-therapy
#8
Sheng Wang, Jing Lin, Zhantong Wang, Zijian Zhou, Ruiliang Bai, Nan Lu, Yijing Liu, Xiao Fu, Orit Jacobson, Wenpei Fan, Junle Qu, Siping Chen, Tianfu Wang, Peng Huang, Xiaoyuan Chen
Integration of magnetic resonance imaging (MRI) and other imaging modalities is promising to furnish complementary information for accurate cancer diagnosis and imaging-guided therapy. However, most gadolinium (Gd)-chelator MR contrast agents are limited by their relatively low relaxivity and high risk of released-Gd-ions-associated toxicity. Herein, a radionuclide-(64) Cu-labeled doxorubicin-loaded polydopamine (PDA)-gadolinium-metallofullerene core-satellite nanotheranostic agent (denoted as CDPGM) is developed for MR/photoacoustic (PA)/positron emission tomography (PET) multimodal imaging-guided combination cancer therapy...
July 13, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28698069/theranostic-and-nanotheranostic-probes-in-nuclear-medicine
#9
REVIEW
Natascha Drude, Lena Tienken, Felix M Mottaghy
In nuclear medicine, a theranostic probe describes a substance that combines diagnostic and therapeutic capabilities by radiolabeling it with different radionuclides. Next to a brief description of the different emitters (α, β(+), β(-), γ) used for imaging and/or therapy, the aim of this review is to summarize the most commonly used theranostic probes in nuclear medicine. Another goal is to give an idea which chemical requirements need to be fulfilled for radiolabeling with either therapeutic and/ or diagnostic relevant nuclides...
July 8, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28693204/treatment-of-a-mixed-acinar-endocrine-carcinoma-with-uptake-on-68-gallium-dotatoc-positron-emission-tomography-computed-tomography-a-case-report
#10
Anneleen De Both, Marc De Man, Roberto Troisi, Hans Van Vlierberghe, Anne Hoorens, Karen Geboes
The case of a 35-year old female patient with a diagnosis of metastatic mixed acinar-endocrine carcinoma (MAEC) is investigated in the present study. The patient was believed to have a well-differentiated neuroendocrine tumor (NET) with a high Ki-67 index and uptake on (68)Gallium-DOTATOC positron emission tomography-computed tomography for 9 years, and was treated accordingly. The patient had long lasting disease control by treatment with sunitinib, and a response was observed in numerous lesions with peptide receptor radionuclide therapy (PRRT)...
July 2017: Oncology Letters
https://www.readbyqxmd.com/read/28690675/development-of-sentinel-node-biopsy-roll-and-iart-in-early-breast-cancer-at-the-european-institute-of-oncology-milan-ieo
#11
REVIEW
Giovanni Paganelli
The problem of unnecessary axillary clearance in many patients with early breast cancer was certainly a major issue at IEO when we started working with Prof. Umberto Veronesi in 1994. At that time, axillary dissection in EBC was offered to all patients and this procedure was often hotly debated during our multidisciplinary breast cancer meetings. The question as to whether we could avoid axillary dissection by using PET scans or other nuclear medicine methods was frequently asked by Veronesi. This eventually prompted us to investigate whether, as for melanoma patients, the sentinel node biopsy (SNB) approach could reliably be applied to breast cancer...
2017: Ecancermedicalscience
https://www.readbyqxmd.com/read/28687600/pretargeted-imaging-and-therapy
#12
Mohamed Altai, Rosemery Membreno, Brendon Cook, Vladimir Tolmachev, Brian Zeglis
In vivo pretargeting stands as a promising approach to harnessing the exquisite tumor-targeting properties of antibodies for nuclear imaging and therapy while simultaneously skirting their pharmacokinetic limitations. The core premise of pretargeting lies in administering the targeting vector and radioisotope separately and having the two components combine within the body. In this manner, pretargeting strategies decrease the circulation time of the radioactivity, reduce the uptake of the radionuclide in healthy non-target tissues, and facilitate the use of short-lived radionuclides that would otherwise be incompatible with antibody-based vectors...
July 7, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28682793/impact-of-pet-and-mri-threshold-based-tumor-volume-segmentation-on-patient-specific-targeted-radionuclide-therapy-dosimetry-using-clr1404
#13
Abigail E Besemer, Benjamin Titz, Joseph J Grudzinski, Jamey P Weichert, John S Kuo, H Ian Robins, Lance T Hall, Bryan P Bednarz
Variations in tumor volume segmentation methods in targeted radionuclide therapy (TRT) may lead to dosimetric uncertainties. This work investigates the impact of PET and MRI threshold-based tumor segmentation on TRT dosimetry in patients with primary and metastatic brain tumors. In this study, PET/CT images of five brain cancer patients were acquired at 6, 24, and 48 h post-injection of (124)I-CLR1404. The tumor volume was segmented using two standardized uptake value (SUV) threshold levels, two tumor-to-background ratio (TBR) threshold levels, and a T1 Gadolinium-enhanced MRI threshold...
July 6, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28680210/incidentally-detected-thyroid-follicular-neoplasm-on-somatostatin-receptor-imaging-and-post-therapy-scan
#14
Apurva Sood, Harpreet Singh, Ashwani Sood, Rajender Kumar Basher, Bhagwant Rai Mittal
Peptide receptor radionuclide therapy (PRRT) either using Lu-177 or Y-90 peptide radiopharmaceuticals has emerged as promising treatment modality in patients with inoperable metastatic neuroendocrine tumour (NET) including medullary thyroid cancer, because of overexpression of somatostatin receptor 2 (sstr-2) on these cells. The several investigators have used PRRT in non-iodine avid differentiated thyroid cancer patients with limited success, where other treatment modalities have failed, probably due to faint sstr-2 expression in these lesions...
July 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/28677577/targeted-radionuclide-therapy-in-combined-modality-regimens
#15
REVIEW
Martin R Gill, Nadia Falzone, Yong Du, Katherine A Vallis
Targeted radionuclide therapy (TRT) is a branch of cancer medicine concerned with the use of radioisotopes, radiolabelled molecules, nanoparticles, or microparticles that either naturally accumulate in or are designed to target tumours. TRT combines the specificity of molecular and sometimes physical targeting with the potent cytotoxicity of ionising radiation. Targeting vectors for TRT include antibodies, antibody fragments, proteins, peptides, and small molecules. The diversity of available carrier molecules, together with the large panel of suitable radioisotopes with unique physicochemical properties, allows vector-radionuclide pairings to be matched to the molecular, pathological, and physical characteristics of a tumour...
July 2017: Lancet Oncology
https://www.readbyqxmd.com/read/28675216/comparative-studies-on-the-therapeutic-benefit-of-targeted-%C3%AE-particle-radiation-therapy-for-the-treatment-of-disseminated-intraperitoneal-disease
#16
Diane E Milenic, Kwamena E Baidoo, Young-Seung Kim, Rachel Barkley, Martin W Brechbiel
Identification of the appropriate combination of radionuclide, target and targeting vehicle is critical for successful radioimmunotherapy. For the treatment of disseminated peritoneal diseases such as pancreatic or ovarian cancer, α-emitting radionuclides have been proposed for targeted radiation therapy. This laboratory has taken a systematic approach investigating targeted α-radiation therapy, allowing comparisons to now be made between (211)At, (227)Th, (213)Bi and (212)Pb. Herein, trastuzumab radiolabeled with (211)At and (227)Th was evaluated for therapeutic efficacy in the LS-174T i...
July 4, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28670182/-177-lu-dotatate-peptide-receptor-radionuclide-therapy-in-metastatic-or-advanced-and-inoperable-primary-neuroendocrine-tumors-of-rare-sites
#17
Pradeep Thapa, Rahul Parghane, Sandip Basu
The present study aimed at exploring the patient and imaging characteristics of primary neuroendocrine tumors (NETs) of rare sites who presented with metastatic and/or advanced inoperable stages and therefore was considered for peptide receptor radionuclide therapy (PRRT) with (177)Lu-DOTATATE. A retrospective analysis was undertaken of these patients focusing on the aforementioned aspects. All patients underwent dual-tracer molecular functional imaging with somatostatin receptor (SSTR)-based imaging (with either (99m)Tc-HYNIC-TOC or (68)Ga-DOTATATE) and (18)fluorine fludeoxyglucose positron emission tomography-computed tomography as the pretherapy assessment...
July 2017: World Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/28667454/effects-of-cardiac-resynchronization-therapy-on-right-ventricular-function-during-rest-and-exercise-as-assessed-by-radionuclide-angiography-and-on-nt-probnp-levels
#18
Cinzia Valzania, Mauro Biffi, Rachele Bonfiglioli, Francesco Fallani, Cristian Martignani, Igor Diemberger, Matteo Ziacchi, Jessica Frisoni, Luciana Tomasi, Stefano Fanti, Claudio Rapezzi, Giuseppe Boriani
AIM: We carried out this study to investigate mid-term effects of cardiac resynchronization therapy (CRT) on right ventricular (RV) function and neurohormonal response, expressed by N-terminal pro-brain natriuretic peptide (NT-proBNP), in heart failure patients stratified by baseline RV ejection fraction (RVEF). METHODS AND RESULTS: Thirty-six patients with nonischemic dilated cardiomyopathy underwent technetium-99m radionuclide angiography with bicycle exercise immediately after CRT implantation (during spontaneous rhythm and after CRT activation) and 3 months later...
June 30, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28663580/an-atlas-of-bloodstream-accessible-bone-marrow-proteins-for-site-directed-therapy-of-acute-myeloid-leukemia
#19
L Angenendt, S Reuter, D Kentrup, A S Benk, F Neumann, J Hüve, A C Martens, C Schwöppe, T Kessler, L H Schmidt, T Sauer, C Brand, J-H Mikesch, G Lenz, R M Mesters, C Müller-Tidow, W Hartmann, E Wardelmann, D Neri, W E Berdel, C Roesli, C Schliemann
The concept of arming antibodies with bioactive payloads for a site-specific therapy of cancer has gained considerable interest in recent years. However, a successful antibody-based targeting approach critically relies on the availability of a tumor-associated target, which is not only preferentially expressed in the tumor tissue but which is also easily accessible for antibody therapeutics coming from the bloodstream. Here, we perfused the vasculature of healthy and acute myeloid leukemia (AML)-bearing rats with a reactive ester derivative of biotin and subsequently quantified the biotinylated proteins to identify AML-associated bone marrow (BM) antigens accessible from the bloodstream...
June 30, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28655913/novel-small-peptides-derived-from-vegf125-136-potential-drugs-for-radioactive-diagnosis-and-therapy-in-a549-tumor-bearing-nude-mice
#20
Xiang Zhang, Shibin Feng, Jie Liu, Qianwei Li, Lei Zheng, Laiping Xie, Hongmin Li, Dingde Huang
Vascular endothelial growth factor receptor (VEGFR) is a critical factor in tumor angiogenesis and has been considered a potential target for receptor-mediated radionuclide imaging and therapy. In this study, we identified two peptides (QKRKRKKSRKKH and RKRKRKKSRYIVLS) derived from VEGF125-136 that displayed high binding affinities to VEGFR and strong inhibition of A549 cell growth. (99m)Tc- and (188)Re-labeled peptides displayed high labeling efficiency and favorable stability in saline and human plasma. At the cellular level, the radiolabeled peptides could bind with A549 cells and be internalized via the VEGFR-1-mediated pathway...
June 27, 2017: Scientific Reports
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