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https://www.readbyqxmd.com/read/28821486/delayed-risk-stratification-system-in-pt1an0-nx-dtc-patients-treated-without-radioactive-iodine
#1
Danuta Gąsior-Perczak, Iwona Pałyga, Monika Szymonek, Artur Kowalik, Agnieszka Walczyk, Janusz Kopczyński, Katarzyna Lizis-Kolus, Anna Słuszniak, Janusz Słuszniak, Tomasz Łopatyński, Ryszard Mezyk, Stanisław Góźdź, Aldona Kowalska
PURPOSE: A delayed risk stratification (DRS) system by Momesso et al. was accepted by the American Thyroid Association as a diagnostic tool for the risk stratification of unfavorable clinical outcomes and to monitor the clinical outcomes of differentiated thyroid cancer (DTC) patients treated without radioactive iodine (RAI). The aim of this study was to evaluate the DRS system in patients with pT1aN0/Nx stage . METHODS: The study included 304 low-risk patients after thyroidectomy (n=202) or lobectomy (n=102) without RAI and were treated at a single center...
August 18, 2017: Endocrine Connections
https://www.readbyqxmd.com/read/28820600/magnesiate-addition-ring-expansion-strategy-to-access-the-6-7-6-tricyclic-core-of-hetisine-type-c20-diterpenoid-alkaloids
#2
Jason J Pflueger, Louis C Morrill, Justine N deGruyter, Melecio A Perea, Richmond Sarpong
A synthetic strategy to access the fused 6-7-6 tricyclic core of hetisine-type C20-diterpenoid alkaloids is reported. This strategy employs a Diels-Alder cycloaddition to assemble a fused bicyclic anhydride intermediate, which is elaborated to a vinyl lactone-acetal bearing an aromatic ring in five steps. Aromatic iodination is followed by magnesium-halogen exchange with a trialkyl magnesiate species, which undergoes intramolecular cyclization. Subsequent oxidation provides the desired 6-7-6 tricyclic diketoaldehyde, with carbonyl groups at all three positions for eventual C-N bond formation and subsequent elaboration...
August 18, 2017: Organic Letters
https://www.readbyqxmd.com/read/28819948/the-role-of-selenium-in-thyroid-gland-pathophysiology
#3
Michał Stuss, Marta Michalska-Kasiczak, Ewa Sewerynek
It is now assumed that proper functioning of the thyroid gland (TG), beside iodine, requires also a number of elements, including selenium, iron, zinc, copper, and calcium. In many cases, only an adequate supply of one of these microelements (e.g. iodine) may reveal symptoms resulting from deficits of other microelements (e.g. iron or selenium). Selenium is accounted to the trace elements of key importance for homeostasis of the human system, in particular, for the proper functioning of the immune system and the TG...
2017: Endokrynologia Polska
https://www.readbyqxmd.com/read/28817989/optimal-skin-antiseptic-agents-for-prevention-of-surgical-site-infection-in-cesarean-section-a-meta-analysis-with-trial-sequential-analysis
#4
Huaping Huang, Guirong Li, Haiyan Wang, Mei He
PURPOSE: The best choice of antiseptic agent for skin preparation at cesarean section remains controversial. We performed this meta-analysis to assess whether chlorhexidine (CH)-based skin antisepsis was more effective than povidone iodine (PI)-based antisepsis for prevention of surgical site infection (SSI) after cesarean section. METHODS: PubMed, EMBASE, and the Cochrane Library were systematically searched to identify English publications that compared chlorhexidine gluconate (CH) as a skin preparation agent with PI in cesarean section...
August 17, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28817776/electrophilic-cyclization-of-phenylalkynediols-to-naphthyl-aryl-iodonium-triflates-with-chelating-hydroxyls-preparation-and-x-ray-analyses
#5
Robert James Hinkle, Sarah E Bredenkamp, Robert David Pike, Seong Ik Cheon
Alkynediols containing one propargylic alcohol as well as a second alcohol, which is propargylic or homopropargylic, react with PhI(+)CN(-)OTf (Stang's reagent) or 3,5-(CF3)2C6H3I(+)CN(-)OTf to afford naphthyl(aryl)iodonium triflates. The reaction occurs at room temperature over the course of 6-12 hours and provides 36-82% yields of microcrystalline solids. Slow diffusion of Et2O into CH3CN solutions of the salts afforded X-ray quality crystals of five compounds with hydroxyl groups forming five- and six-membered chelation complexes with the iodine atom...
August 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28817768/metal-free-synthesis-of-homopropargylic-alcohols-from-aldehydes
#6
Bruno V M Teodoro, Luiz F Silva
The synthesis of homopropargylic alcohols under metal-free and mild condition is described. This transformation is based on a one-pot procedure involving sequential α-alkynylation of acyclic aldehydes using hypervalent iodine reagents and borohydride reduction. The chemistry exhibit broad substrate scope and good scalability, providing a convenient route for the α-alkynylation of aldehydes along with the formation of a quaternary carbon center. The applicability of the method is demonstrated by the gram-scale synthesis of the key synthetic precursor of botulinum toxin inhibitors...
August 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28817605/all-trans-retinoic-acid-suppresses-malignant-characteristics-of-cd133-positive-thyroid-cancer-stem-cells-and-induces-apoptosis
#7
Dan Mei, Bin Lv, Bo Chen, Shan Xiao, Jie Jiang, Yan Xie, Ling Jiang
Recently, diagnoses of radioiodine-refractory differentiated thyroid cancer (RAI-R DTC) have become more common; prognosis is poor. It has been suggested that cancer stem cells account for radiotherapy resistance. By flow cytometry, different expression percents of CD133 and OCT4 in thyroid cancer cell lines were detected. By real-time quantitative PCR, different mRNA expression of CD133, OCT4, GLUT1, thyroglobulin (TG), thyroperoxidase (TPO) and sodium iodine symporter (NIS) was analyzed; the localization of CD133, OCT4, and NIS expression was examined using immunofluorescence confocal microscopy...
2017: PloS One
https://www.readbyqxmd.com/read/28817273/single-step-synthesis-of-iodinated-oxazoles-from-n-propargyl-amides-mediated-by-i2-iodosylbenzene-tmsotf-systems
#8
Sho Suzuki, Akio Saito
A combination of I2, iodosylbenzene and TMSOTf is effective on a single-step synthesis of iodinated oxazoles from N-propargyl amides via the aromatization of the iodocyclized intermediates, which is difficult to proceed by the conventional iodocyclization methods. Compared to the former method consisting of the metal-catalyzed cyclization of N-propargyl amides followed by halogenation of alkylideneoxazolines, the present reaction provides facile and metal-free procedure.
August 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28816536/optimizing-lenvatinib-therapy-in-patients-with-metastatic-radioactive-iodine-resistant-differentiated-thyroid-cancers
#9
Sina Jasim, Nicole M Iniguez-Ariza, Crystal R Hilger, Ashish V Chintakuntlawar, Mabel M Ryder, John C Morris, Keith C Bible
BACKGROUND AND OBJECTIVES: Lenvatinib is approved for use in advanced radioactive iodine resistant differentiated thyroid cancers (RAIR-DTCs); its efficacy is indisputable, but toxicities are great, creating daunting challenges for patients and providers. Few data regarding early adverse events and impact on quality of life (QOL) exist; we sought to add clarity to these issues by analyzing our initial post-approval lenvatinib experience. METHODS: Standardized patient education was implemented, providing detailed instructions and expert provider contacts to facilitate timely reporting of toxicities and guide responsive actions...
August 17, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/28816304/iodoarene-catalyzed-oxidative-transformations-using-molecular-oxygen
#10
K Miyamoto, J Yamashita, S Narita, Y Sakai, K Hirano, T Saito, C Wang, M Ochiai, M Uchiyama
Molecular oxygen serves as a useful oxidant for the glycol scission of 1,2-diols and the Hofmann rearrangement of primary amides using pentamethyliodobenzene as a catalyst. The use of isobutyraldehyde and Lewis basic nitriles under O2 enabled the iodine(i)/(iii) catalytic cycle, where in situ-generated peracid acts as a terminal oxidant.
August 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28816214/synchronous-malignancies-of-thyroglossal-duct-cyst-and-thyroid-gland
#11
Chinna Naik, Sandip Basu
Malignant involvement of thyroglossal duct cyst is rare, still rarer is the synchronous malignant involvement of the thyroid gland. Although the Sistrunk procedure is often regarded as adequate, controversy exists of the need for an additional total thyroidectomy and radioiodine ablative therapy, the decision of which depends upon the presence of (i) suspicious thyroid gland nodule; (ii) presence of lymphadenopathy; or (iii) a previous history of neck irradiation. We report a 47-year-old woman diagnosed with papillary carcinoma within a recurrent thyroglossal duct cyst with infiltration into surrounding soft tissues and a suspicious thyroid nodule of the left thyroid lobe with no regional lymph node involvement...
March 2017: National Medical Journal of India
https://www.readbyqxmd.com/read/28814477/iodine-excess-exposure-during-pregnancy-and-lactation-impairs-maternal-thyroid-function-in-rats
#12
Caroline Serrano-Nascimento, Rafael Salgueiro, Kaio Vitzel, Thiago Urgal Pantaleao, Vania Maria Correa da Costa, Maria Tereza Nunes
Adequate maternal iodine consumption during pregnancy and lactation guarantees normal thyroid hormones (TH) production, which is crucial to the development of the fetus. Indeed, iodine deficiency is clearly related to maternal hypothyroidism and deleterious effects in the fetal development. Conversely, the effects of iodine excess (IE) consumption on maternal thyroid function are still controversial. Therefore, this study aimed to investigate the impact of IE exposure during pregnancy and lactation periods on maternal hypothalamus-pituitary-thyroid axis...
August 16, 2017: Endocrine Connections
https://www.readbyqxmd.com/read/28814251/the-role-of-radiopharmaceuticals-in-amiodarone-induced-thyroid-pathology
#13
Doina Piciu, Alexandru Irimie
Amiodarone is a di-iodinated benzofuran derivative and is classified as a class III antiarrhythmic agent. It is one of the most powerful and effective antiarrhythmics, being a first-line agent due to its ability to treat ventricular and supraventricular dysrhythmias; since 1960 the drug has become one of the most frequently prescribed antiarrhythmics, despite its potentially serious, side effects. By far, one of the most challenging condition is the thyroid pathology induced by this drug. Each 200 mg tablet of amiodarone contains approximately 75 mg of iodine, 3-10% from each tablet being released as free iodine...
August 16, 2017: Current Radiopharmaceuticals
https://www.readbyqxmd.com/read/28812923/the-use-of-prophylactic-nunchaku-stents-to-reduce-the-risk-of-nasolacrimal-duct-obstruction-in-patients-with-midfacial-tumours-undergoing-radiotherapy
#14
Valerie A R Juniat, Saul Rajak
The treatment of midfacial tumours with radiotherapy, chemotherapy and radio-iodine can cause nasolacrimal duct fibrosis resulting in epiphora. Nasolacrimal patency can be maintained by stenting. We report our experience of prophylatic Nunchaku stent insertion in 5 patients prior to midfacial radiotherapy. Four out of 5 patients (80%) had patent nasolacrimal ducts without any symptoms of epiphora following removal of the stents. One patient was initially asymptomatic with patent nasolacrimal duct, but subsequently developed epiphora...
August 16, 2017: Orbit
https://www.readbyqxmd.com/read/28812346/metal-free-synthesis-of-2-aminobenzothiazoles-via-iodine-catalyzed-and-oxygen-promoted-cascade-reactions-of-isothiocyanatobenzenes-with-amines
#15
Yuanshuang Xu, Bin Li, Xinying Zhang, Xuesen Fan
In this paper, a highly efficient and sustainable synthesis of 2-aminobenzothiazoles through the cascade reactions of isothiocyanatobenzenes with primary or secondary amines by using iodine as a catalyst and oxygen as an oxidant is presented. Mechanistically, the formation of the title compounds involves the in situ formation of the required benzothiourea intermediate followed by its intramolecular cross dehydrogenative coupling of a C(sp2)-H bond and a S-H bond. To our knowledge, this should be the first example in which 2-aminobenzothiazoles are efficiently prepared from simple and cheap isothiocyanates and amines under metal free conditions by using iodine as a catalyst and molecular oxygen as an oxidant with water as the byproduct...
August 16, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28812126/myocardial-iodine-concentration-measurement-using-dual-energy-computed-tomography-for-the-diagnosis-of-cardiac-amyloidosis-a-pilot-study
#16
Virgile Chevance, Thibaud Damy, Vania Tacher, François Legou, Fourat Ridouani, Alain Luciani, Hicham Kobeiter, Alain Rahmouni, Jean-François Deux
OBJECTIVE: To measure myocardium iodine concentration (MIC) in patients with cardiac amyloidosis (CA) using dual-energy computed tomography (DECT). METHODS: Twenty-two patients with CA, 13 with non-amyloid hypertrophic cardiomyopathies (CH) and 10 control patients were explored with pre-contrast, arterial and 5-minute DECT acquisition (Iomeprol; 1.5 mL/kg). Inter-ventricular septum (IVS) thickness, blood pool iodine concentration (BPIC), MIC (mg/mL), iodine ratio and extra-cellular volume (ECV) were calculated...
August 10, 2017: European Radiology
https://www.readbyqxmd.com/read/28811929/dual-energy-computed-tomography-angiography-virtual-calcified-plaque-subtraction-in-a-vascular-phantom
#17
Kwang Nam Jin, Jin Wook Chung, Eun-Ah Park, Whal Lee
BACKGROUND: Material decomposition of dual-energy computed tomography (DECT) enables subtraction of calcified plaque. PURPOSE: To evaluate the accuracy of lumen area measurement in calcified plaque by subtraction of DECT and to determine the effect of contrast material concentration, lumen diameter, density, and thickness of calcified plaque for the measurement. MATERIAL AND METHODS: Vessel phantoms were made with six lumen diameters (5.7, 4...
July 2017: Acta Radiologica Open
https://www.readbyqxmd.com/read/28811561/analysis-of-risk-factors-of-rapid-thyroidal-radioiodine-131-turnover-in-graves-disease-patients
#18
Ruiguo Zhang, Jian Tan, Renfei Wang, Guizhi Zhang, Qiang Jia, Zhaowei Meng, Yueqian Zhang
Rapid iodine-131((131)I) turnover in the thyroid gland is an important feature of Graves' disease (GD) and also a strong predictor of radioiodine therapy failure. The aim of this study was to explore the predictors of rapid (131)I turnover. The clinical data on 2543 patients were retrospectively reviewed. Patients were divided into 2 groups depending on present or absent with rapid (131)I turnover defined as a 4-hour to 24-hour (131)I uptake ratio of ≥1. Overall, 590 cases (23.2%) had a rapid (131)I turnover...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28810555/evaluation-of-rat-c6-malignant-glioma-using-spectral-computed-tomography
#19
Jianli Liu, Junlin Zhou, Jie Li, Lingyan Zhang, Peili Zhang, Bin Liu
To investigate the use of multi-parameter spectral computed tomography (CT) for the evaluation of rat C6 glioma, 15 male Wistar rats were seeded with C6 glioma cells into the right basal ganglia and scanned 12 days later using spectral CT. Brain sections corresponding to scanned regions were immunostained for proliferation marker protein Ki67 (Ki67). Pearson's correlation coefficients between spectral CT parameters and Ki67 expression were determined. Thirteen rats survived 12 days and developed tumors. Optimal contrast-to-noise ratio achieved was 65 keV...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28809976/2-2-diiododimedone-a-mild-electrophilic-iodinating-agent-for-the-selective-synthesis-of-%C3%AE-iodoketones-from-allylic-alcohols
#20
Samuel Martinez-Erro, Antonio Bermejo Gómez, Ana Vázquez-Romero, Elis Erbing, Belén Martín-Matute
2,2-Diiodo-5,5-dimethylcyclohexane-1,3-dione is reported as a new electrophilic iodinating agent that selectively iodinates electron-rich aromatics. In contrast to other common electrophilic iodinating reagents, its mild nature allows it to be used for the selective synthesis of α-iodinated carbonyl compounds from allylic alcohols through a 1,3-hydrogen shift/iodination process catalyzed by iridium(iii) complexes.
August 15, 2017: Chemical Communications: Chem Comm
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