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https://www.readbyqxmd.com/read/29894210/improved-targeting-and-tumor-retention-of-a-newly-synthesized-antineoplaston-a10-derivative-by-intratumoral-administration-molecular-docking-technetium-99m-radiolabeling-and-in-vivo-biodistribution-studies
#1
Mohamed H Aboumanei, Aly A Abdelbary, Ismail T Ibrahim, Mina I Tadros, Mohamed T El-Kolaly
Recently, the direct intratumoral (i.t.) injection of anticancer agents has been investigated. A newly synthesized Antineoplaston A10 analog 3-(4-methoxybenzoylamino)-2,6-piperidinedione (MPD) showed an antitumor activity in human breast cancer cell line. Unfortunately, MPD suffered from poor water solubility. Pseudoternary phase diagram of oil (isopropyl myristate), surfactant (Tween 80), cosurfactant (ethanol), and water was plotted. MPD microemulsion (MPDME) was developed and characterized for particle size (PS), polydispersity index (PDI), zeta potential (ZP), and morphology (transmission electron microscopy)...
June 12, 2018: Cancer Biotherapy & Radiopharmaceuticals
https://www.readbyqxmd.com/read/29885559/-99m-tc-d-lpr-a-novel-retro-inverso-peptide-for-vegf-receptor-1-targeted-tumor-imaging
#2
Farzaneh Rezazadeh, Nourollah Sadeghzadeh, Seyed Mohammad Abedi, Saeid Abediankenari
INTRODUCTION: The aim of this study was to evaluate the ability of D (LPR), a novel retro-inverso peptidomimetic derivative for imaging colon cancer. METHODS: Two different D (LPR) analogs were designed and compared based on conjugation of HYNIC at peptide's C or N terminal and then labeled with technetium-99m using tricine/EDDA as an exchange coligands. The radiolabeled conjugates were assessed for in vitro stability in saline and serum. The VEGFR-1 and NRP-1 receptors affinity, in vitro internalization and also dissociation Constance was evaluated...
May 31, 2018: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/29884688/the-effect-of-the-presence-of-eeg-leads-on-image-quality-in-cerebral-perfusion-spect-and-fdg-pet-ct
#3
Lulu Zhang, Stephanie P Yen, Marc A Seltzer, George P Thomas, Kristen Willis, Alan Siegel
Rationale: Cerebral perfusion SPECT and 18 F-FDG PET/CT are commonly performed diagnostic procedures for patients suffering from epilepsy. Individuals receiving these tests are often in-patients undergoing examinations with EEG leads. We have routinely removed these leads before these tests due to concerns that they would lead to imaging artifacts. The leads would then be replaced at the conclusion of the scan. The goal of our study was to determine if the EEG leads actually do cause artifacts that could lead to erroneous scan interpretation or make the scan uninterpretable...
June 8, 2018: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/29877994/assessment-of-normal-reference-values-for-thyroid-uptake-of-technetium-99m-pertechnetate-in-a-single-centre-uk-population
#4
Mavin Macauley, Mohamed Shawgi, Tamir Ali, Andrew Curry, Kim Howe, Elizabeth Howell, Elizabeth Jefferson, Andrew James, Petros Perros, George S Petrides
OBJECTIVE: This study aims to explore the normal reference values for thyroid uptake of technetium-99m (Tc) pertechnetate in a UK population. PATIENTS AND METHODS: A retrospective review of 60 euthyroid patients who underwent thyroid imaging with Tc pertechnetate between January 2012 to April 2014 as part of dual-tracer subtraction parathyroid scintigraphy. Tc pertechnetate thyroid uptake values were determined for each patient. Medical records and biochemical thyroid function tests were reviewed to ensure that all patients were not on medication that could affect thyroid function and they were both clinically and biochemically euthyroid 6 months before and following the scan...
June 6, 2018: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/29877993/99mtc-phy-portal-perfusion-index-imaging-helps-predict-the-severity-of-hepatitis-b-virus-cirrhosis-a-preliminary-study
#5
Ning-Hu Liu, Meng-Jie Dong, Hao Liu, Xi-Li Lu, Dan Tian, Jun Zhang, Jun Yang, Jun-Hui Sun, Li-Hua Wu, Jian-Li Bi, Bo Zhang
OBJECTIVE: The aim was to perform exploratory research on the application of technetium phytate (Tc-Phy) portal perfusion index (PPI) imaging in predicting the complications of hepatitis B cirrhosis and their severity. PATIENTS AND METHODS: A total of 65 hepatitis B cirrhosis patients were stratified, respectively, into three groups from classes A to C according to Child-Pugh scores and five groups from stages 1 to 5 according to the five-stage prognostic system...
June 6, 2018: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/29877611/highly-specific-preoperative-selection-of-solitary-parathyroid-adenoma-cases-in-primary-hyperparathyroidism-by-quantitative-image-analysis-of-the-early-phase-technetium-99m-sestamibi-scan
#6
DaeHee Kim, Jeffrey A Rhodes, Jeffrey A Hashim, Lawrence Rickabaugh, David M Brams, Edward Pinkus, Yamin Dou
INTRODUCTION: Highly specific preoperative localizing test is required to select patients for minimally invasive parathyroidectomy (MIP) in lieu of traditional four-gland exploration. We hypothesized that Tc-99m sestamibi scan interpretation incorporating numerical measurements on the degree of asymmetrical activity from bilateral thyroid beds can be useful in localizing single adenoma for MIP. METHODS: We devised a quantitative interpretation method for Tc-99m sestamibi scan based on the numerically graded asymmetrical activity on early phase...
June 7, 2018: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/29876541/a-sensitive-and-rapid-radiolabelling-method-for-the-in-vivo-pharmacokinetic-study-of-lentinan
#7
Yu Zhang, Ziming Zheng, Xiawen Yang, Xianglin Pan, Lianglan Yin, Xiao Huang, Qiang Li, Yamin Shu, Qilin Zhang, Kaiping Wang
The aim of this study is to establish a rapid and sensitive method for detecting lentinan (LNT) in biosamples and to evaluate the pharmacokinetics of LNT in mice and rats. A diethylenetriaminepentaacetic acid (DTPA) derivative of LNT (DTPA-LNT) was synthesized first to allow labelling with 99m-technetium (99mTc). After purification and identification, 99mTc-DTPA-LNT was intravenously administered to mice (2 mg kg-1) and rats at different doses (0.5, 2 and 8 mg kg-1). The results showed that the 99mTc-labelling method was suitable for the quantification of the LNT concentration in biological samples, with satisfactory linearity (r2 > 0...
June 7, 2018: Food & Function
https://www.readbyqxmd.com/read/29875850/absent-99m-tc-mibi-uptake-in-the-thyroid-gland-during-early-phase-of-parathyroid-scintigraphy-in-patients-with-primary-and-secondary-hyperparathyroidism
#8
Anamarija Jovanovska, Bojana Stoilovska, Magdalena Mileva, Daniela Miladinova, Venjamin Majstorov, Ana Ugrinska
BACKGROUND: Thyroid uptake of technetium-99m methoxyisobutylisonitrile (99m Tc-MIBI) during parathyroid scintigraphy can be affected by various conditions. AIM: To evaluate the frequency of absent 99m Tc-MIBI uptake by the thyroid gland in the early phase of dual-phase parathyroid scintigraphy. METHODS: The early planar images of dual phase Tc99m MIBI parathyroid scintigraphy from 217 patients performed between 2014 and 2017 were retrospectively analysed...
May 20, 2018: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/29873171/a-rural-perspective-on-minimally-invasive-parathyroidectomy-optimal-preoperative-imaging-and-patient-outcomes
#9
Matthew Binks, Denbigh Burrows, David Littlejohn
BACKGROUND: Our retrospective review of prospectively collected data evaluated the efficacy of minimally invasive parathyroidectomy (MIP) and compared preoperative imaging modalities in a rural referral centre. METHODS: Patients with a diagnosis of primary hyperparathyroidism underwent surgeon-performed ultrasound (SUS) and technetium-99 m sestamibi (MIBI). Radiologist-performed ultrasound (RUS) was sought when the diagnosis remained in doubt. Four-dimensional computed tomography (4DCT) first replaced RUS in mid-2014, then MIBI as a frontline modality in 2015...
June 5, 2018: ANZ Journal of Surgery
https://www.readbyqxmd.com/read/29869521/spect-ct-imaging-of-chemotherapy-induced-tumor-apoptosis-using-99m-tc-labeled-dendrimer-entrapped-gold-nanoparticles
#10
Yan Xing, Jingyi Zhu, Lingzhou Zhao, Zhijuan Xiong, Yujie Li, San Wu, Gitasha Chand, Xiangyang Shi, Jinhua Zhao
Non-invasive imaging of apoptosis in tumors induced by chemotherapy is of great value in the evaluation of therapeutic efficiency. In this study, we report the synthesis, characterization, and utilization of radionuclide technetium-99m (99m Tc)-labeled dendrimer-entrapped gold nanoparticles (Au DENPs) for targeted SPECT/CT imaging of chemotherapy-induced tumor apoptosis. Generation five poly(amidoamine) (PAMAM) dendrimers (G5.NH2 ) were sequentially conjugated with 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA), polyethylene glycol (PEG) modified duramycin, PEG monomethyl ether, and fluorescein isothiocyanate (FI) to form the multifunctional dendrimers, which were then utilized as templates to entrap gold nanoparticles...
November 2018: Drug Delivery
https://www.readbyqxmd.com/read/29864917/%C3%AE-tocopherol-succinate-loaded-nano-structed-lipid-carriers-improves-antitumor-activity-of-doxorubicin-in-breast-cancer-models-in-vivo
#11
Renata S Fernandes, Juliana O Silva, Heloísa A Seabra, Mariana S Oliveira, Virgínia M Carregal, José M C Vilela, Margareth S Andrade, Danyelle M Townsend, Patrick M Colletti, Elaine A Leite, Valbert N Cardoso, Lucas A M Ferreira, Domenico Rubello, André L B Barros
Combination-based chemotherapies have been the standard treatment for multiple solid tumors since the 1960s. Combined therapies where both agents have toxicity results in dose-limiting effects. α- tocopherol succinate (TS) is an analogue of vitamin E that exhibits antitumor properties in the absence of toxicity. Hence, its combination with a frontline chemotherapy, doxorubicin (DOX) is an alternative to increase antitumor efficacy. Therefore, the aim of this work was to evaluate the antitumor activity of nanostructed lipid carriers (NLC) loaded with TS and DOX...
July 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29864241/targeting-of-the-cystic-fibrosis-transmembrane-conductance-regulator-cftr-protein-with-a-technetium-99m-imaging-probe
#12
Vera F C Ferreira, Bruno L Oliveira, João D Santos, João D G Correia, Carlos M Farinha, Filipa Fernandes Mendes
Cystic fibrosis (CF) is caused by mutations in the gene that encodes the CF transmembrane conductance regulator (CFTR) protein. The most common mutation, F508del, leads to almost total absence of CFTR at the plasma membrane, a defect potentially corrected via drug-based therapies. Herein, we report the first proof-of-principle study of a non-invasive imaging probe able to detect CFTR at the plasma membrane. We radiolabelled the CFTR inhibitor, CFTRinh-172a, with technetium-99m via a pyrazolyl-diamine chelating unit, yielding a novel 99mTc(CO)3-complex...
June 4, 2018: ChemMedChem
https://www.readbyqxmd.com/read/29807525/development-and-evaluation-of-liquid-and-solid-lipid-based-drug-delivery-systems-containing-technetium-99m-radiolabeled-alendronate-sodium
#13
Evren Gundogdu, Meliha Ekinci, Emre Ozgenc, Derya Ilem Ozdemir, Makbule Asikoglu
OBJECTIVE: The purpose of this study was to develop lipid-water based drug delivery system of Alendronate Sodium (ALD) in liquid and solid form obtained by using spray drying method and compare these two forms with radioactive cell culture studies. METHODS: This study included that development of liquid and solid form obtained by spray drying method, radiolabelling of ALD with 99mTc, preparation of formulations containing 99mTc -ALD and evaluation of their permeability with Caco-2 cell...
May 28, 2018: Current Radiopharmaceuticals
https://www.readbyqxmd.com/read/29803536/sentinel-lymph-node-biopsy-in-cutaneous-melanoma-of-the-head-and-neck-using-the-indocyanine-green-spy-elite-system
#14
Andrew M Vahabzadeh-Hagh, Keith E Blackwell, Elliot Abemayor, Maie A St John
PURPOSE: Lymph node status is the single most important prognostic factor for patients with early-stage cutaneous melanoma. Sentinel lymph node biopsy (SLNB) has become the standard of care for intermediate depth melanomas. Modern SLNB implementation includes technetium-99 lymphoscintigraphy combined with local administration of a vital blue dye. However, sentinel lymph nodes may fail to localize in some cases and false-negative rates range from 0 to 34%. Here we demonstrate the feasibility of a new sentinel lymph node biopsy technique using indocyanine green (ICG) and the SPY Elite near-infrared imaging system...
May 17, 2018: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/29799999/phase-3-assessment-of-the-automated-bone-scan-index-as-a-prognostic-imaging-biomarker-of-overall-survival-in-men-with-metastatic-castration-resistant-prostate-cancer-a-secondary-analysis-of-a-randomized-clinical-trial
#15
Andrew J Armstrong, Aseem Anand, Lars Edenbrandt, Eva Bondesson, Anders Bjartell, Anders Widmark, Cora N Sternberg, Roberto Pili, Helen Tuvesson, Örjan Nordle, Michael A Carducci, Michael J Morris
Importance: Prostate cancer commonly metastasizes to bone, and bone metastases are associated with pathologic fractures, pain, and reduced survival. Bone disease is routinely visualized using the technetium Tc 99m (99mTc) bone scan; however, the standard interpretation of bone scan data relies on subjective manual assessment of counting metastatic lesion numbers. There is an unmet need for an objective and fully quantitative assessment of bone scan data. Objective: To clinically assess in a prospectively defined analysis plan of a clinical trial the automated Bone Scan Index (aBSI) as an independent prognostic determinant of overall survival (OS) in men with metastatic castration-resistant prostate cancer (mCRPC)...
May 17, 2018: JAMA Oncology
https://www.readbyqxmd.com/read/29790486/-simplicity-or-complexity-of-the-radiopharmaceutical-production-process-in-the-light-of-optimization-of-radiation-protection-of-staff-sup-99m-sup-tc-vs-sup-18-sup-f
#16
Małgorzata Wrzesień
BACKGROUND: A radiopharmaceutical is a combination of a non-radioactive compound with a radioactive isotope. Two isotopes: technetium- 99m (<sup>99m</sup>Tc) and fluorine-18 (<sup>18</sup>F) are worth mentioning on the rich list of isotopes which have found numerous medical applications. Their similarity is limited only to the diagnostic area of applicability. The type and the energy of emitted radiation, the half-life and, in particular, the production method demonstrate their diversity...
May 22, 2018: Medycyna Pracy
https://www.readbyqxmd.com/read/29785109/development-and-characterization-of-a-nanoemulsion-containing-propranolol-for-topical-delivery
#17
Tatiana Zanela da Silva Marques, Ralph Santos-Oliveira, Luciana Betzler de Oliveira de Siqueira, Verônica da Silva Cardoso, Zaida Maria Faria de Freitas, Rita de Cássia da Silva Ascenção Barros, Ana Lúcia Vazquez Villa, Mariana Sato de Souza de Bustamante Monteiro, Elisabete Pereira Dos Santos, Eduardo Ricci-Junior
Background: Propranolol (PPN) is a therapeutic option for the treatment of infantile hemangiomas. This study aimed at the development of nanoemulsion (NE) containing 1% PPN, characterization of the system, and safety studies based on ex vivo permeation, cytotoxicity, and biodistribution in vivo. Methods: The formulation was developed and characterized in relation to the droplet size, polydispersity index (PDI), pH, zeta potential, and electronic microscopy. Ex vivo permeation studies were used to evaluate the cutaneous retention of PPN in the epidermis and dermis...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29778927/evaluation-of-99m-tc-sulfonamide-and-sulfocoumarin-derivatives-for-imaging-carbonic-anhydrase-ix-expression
#18
Misaki Nakai, Jihne Pan, Kuo-Shyan Lin, John R Thompson, Alessio Nocentini, Claudiu T Supuran, Yasuo Nakabayashi, Tim Storr
With the aim to prepare hypoxia tumor imaging agents, technetium(I) and rhenium(I) tricarbonyl complexes with dipyridylamine (L1 = N-{[1-(2,2-dioxido-1,2-benzoxathiin-6-yl)-1H-1,2,3-triazol-4-yl]methyl}-N-(2-pyridinylmethyl)-2-pyridinemethanamine; L3 = N-{[1-[N-(4-aminosulfonylphenyl)]-1H-1,2,3-triazol-4-yl]methyl}-N-(2-pyridinyl-methyl)-2-pyridinemethanamine), and iminodiacetate (H2 L2 = N-{[1-(2,2-dioxido-1,2-benzoxathiin-6-yl)-1H-1,2,3-triazole-4-yl]methyl}-N-(carboxy-methyl)-glycine; H2 L4 = N-{[1-[N-(4-aminosulfonylphenyl)]-1H-1,2,3-triazole-4-yl]methyl}-N-(carboxymethyl)-glycine) ligands appended to sulfonamide or sulfocoumarin carbonic anhydrase inhibitors were synthesized...
April 13, 2018: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29778333/radiotracer-localization-of-nonpalpable-pulmonary-nodules-a-single-center-experience
#19
Sandra L Starnes, Michael Wolujewicz, Julian Guitron, Valerie Williams, Jennifer Scheler, Ross Ristagno
OBJECTIVE: Multiple localization techniques to facilitate intraoperative identification of small or nonsolid pulmonary nodules have been developed. Radiotracer localization using technetium-labeled macroaggregated albumin has been our preferred localization method since 2009. We report our experience, including technical pitfalls and modifications, of our initial 77 patients who underwent this technique. METHODS: All patients undergoing preoperative radiotracer localization were identified from a prospective database...
April 11, 2018: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29777899/congenital-dyshormonogenic-hypothyroidism-with-goiter-caused-by-a-sodium-iodide-symporter-slc5a5-mutation-in-a-family-of-shih-tzu-dogs
#20
E A Soler Arias, V A Castillo, J D Garcia, J C Fyfe
An iodide transport defect (ITD) in the thyroid gland was determined to cause congenital dyshormonogenic hypothyroidism with goiter (CDHG) in 2 members of a family of Shih-Tzu dogs. Strikingly, both dogs were also diagnosed with dilated cardiomyopathy at 24 and 1.5 mo of age. The only sign of hypothyroidism was a moderate growth delay in the adult dog. The ITD was recognized by the absence of uptake of technetium-99m in the salivary glands (sg) and goiter observed by scintigraphy. In the same scan, radiopharmaceutical uptake was found in the anterior mediastinum of both dogs and in the right axillary lymph node in the oldest dog...
April 24, 2018: Domestic Animal Endocrinology
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