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https://www.readbyqxmd.com/read/28529250/impact-of-jaw-position-accuracy-on-dose-variation-in-volumetric-modulated-arc-therapy-using-jaw-tracking
#1
Fumiyasu Matsubayashi, Yuki Koizumi, Ryo Takahashi, Minoru Yoshioka, Tomoharu Sato
The technique of jaw tracking can be used in volumetric modulated arc therapy (VMAT) and intensity modulated radiation therapy (IMRT). In this technique, jaw tracks apertures of the multi leaf collimator (MLC) during irradiation. It is reported that dose variation is occurred by the changing accuracy of MLC position in VMAT and IMRT. Though jaw moves dynamically in the irradiation by using this technique, the influence of the jaw position accuracy on dose variation is not examined. The purpose of this study is to verify the influence of jaw position accuracy on dose variation in VMAT using jaw tracking...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28495383/zinc-complex-of-tryptophan-appended-1-4-7-10-tetraazacyclododecane-as-potential-anticancer-agent-synthesis-and-evaluation
#2
Anupriya Adhikari, Neelam Kumari, Manish Adhikari, Nitin Kumar, Anjani K Tiwari, Abha Shukla, Anil K Mishra, Anupama Datta
With the rising incidences of cancer cases, the quest for new metal based anticancer drugs has led to extensive research in cancer biology. Zinc complexes of amino acid residue side chains are well recognized for hydrolysis of phosphodiester bond in DNA at faster rate. In the presented work, a Zn(II) complex of cyclen substituted with two l-tryptophan units, Zn(II)-Cyclen-(Trp)2 has been synthesized and evaluated for antiproliferative activity. Zn(II)-Cyclen-(Trp)2 was synthesized in ∼70% yield and its DNA binding potential was evaluated through QM/MM study which suggested good binding (G=-9...
April 29, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28487783/delayed-awareness-of-the-history-of-barium-examination-perforated-barium-appendicitis
#3
Susumu Saigusa, Masaki Ohi, Satoshi Oki, Takashi Ichikawa, Minako Kobayashi, Yasuhiro Inoue, Chikao Miki
A 41-year-old man presented to our hospital with lower abdominal pain and a high-grade fever. Physical examination revealed rebound tenderness and guarding in the lower abdomen. Abdominal X-ray examination showed a radiopaque object in the right lower quadrant of the abdomen. Abdominal computed tomography (CT) demonstrated that the object had a strong artifact with over 10,000 Hounsfield units, as well as ascites around the terminal ileum. We diagnosed acute peritonitis with a suspicion of the perforation due to unknown foreign body and performed an emergency laparotomy...
2017: Case Reports in Gastrointestinal Medicine
https://www.readbyqxmd.com/read/28486259/appendicitis-in-a-neutropenic-patient-a-multicentric-retrospective-study
#4
Alberto A Scarpa, Géraldine Hery, Arnaud Petit, Benoit Brethon, Irène Jimenez, Virginie Gandemer, Samuel Abbou, Stéphanie Haouy, Jean Breaud, Marilyne Poiree
To study the management of acute appendicitis in neutropenic patients, we retrospectively reviewed cases of acute appendicitis in neutropenic children treated for cancer. The patients' demographics, medical records, and outcomes were tracked. We compared nonoperative treatment versus emergency or delayed surgery. The cases of 30 patients with a mean age of 8.8 years in 12 French departments of Pediatric Hematology/Oncology between 1995 and 2013 were studied. Most patients (90%) were treated for hematological malignancies...
May 8, 2017: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/28482147/1-4-5-trisubstituted-imidazole-based-p53-mdm2-mdmx-antagonists-with-aliphatic-linkers-for-conjugation-with-biological-carriers
#5
Aleksandra Twarda-Clapa, Sylwia Krzanik, Katarzyna Kubica, Katarzyna Guzik, Beata Labuzek, Constantinos G Neochoritis, Kareem Khoury, Kaja Kowalska, Miroslawa Czub, Grzegorz Dubin, Alexander Dömling, Lukasz Skalniak, Tad A Holak
The tumor suppressor protein p53, the "guardian of the genome", is inactivated in nearly all cancer types by mutations in the TP53 gene or by overexpression of its negative regulators, oncoproteins MDM2/MDMX. Recovery of p53 function by disrupting the p53-MDM2/MDMX interaction using small-molecule antagonists could provide an efficient nongenotoxic anticancer therapy. Here we present the syntheses, activities, and crystal structures of the p53-MDM2/MDMX inhibitors based on the 1,4,5-trisubstituted imidazole scaffold which are appended with aliphatic linkers that enable coupling to bioactive carriers...
May 16, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28472016/laparoscopic-appendectomy-in-children-with-perforated-appendicitis-a-meta-analysis
#6
Shun Zhang, Tao Du, Xiaohua Jiang, Chun Song
BACKGROUND: The purpose of this meta-analysis was to compare the influence of different surgical procedures on perforated appendicitis in pediatric population. MATERIALS AND METHODS: Studies were identified through a computerized literature search of Pubmed, Embase, Ovid, the Cochrane Colorectal Cancer Group Controlled Trials Register, the Cochrane Central Register of Controlled Trials, the Cochrane Library database, and Web of Science. Two reviewers independently assessed the quality of each study and abstracted outcome data...
May 3, 2017: Surgical Laparoscopy, Endoscopy & Percutaneous Techniques
https://www.readbyqxmd.com/read/28395768/what-constitutes-an-unmet-medical-need-in-oncology-an-empirical-evaluation-of-author-usage-in-the-biomedical-literature
#7
Eric Lu, Joseph Shatzel, Florence Shin, Vinay Prasad
The phrase "unmet medical need" has important regulatory implications, but there is no empirical analysis of its real world usage. We sought to determine the annual US incidence, 5-year survival, and number of National Comprehensive Cancer Network (NCCN)-recommended regimens for indications described in the literature as an "unmet medical need." We queried Google Scholar to identify publications where authors used the phrase "unmet medical need" to refer to a specific cancer indication. For each indication, we investigated the annual US incidence, 5-year survival, and number of NCCN recommended regimens...
February 2017: Seminars in Oncology
https://www.readbyqxmd.com/read/28288326/a-hybrid-approach-to-appendicitis-with-right-external-iliac-artery-pseudo-aneurysm-a-case-report
#8
Benjamin T Chandler, Evan J Ryer, Benjamin M Keyser, James R Elmore
INTRODUCTION: While acute appendicitis is a common surgical problem, the simultaneous occurrence of appendicitis and an infected iliac artery pseudoaneurysm is exceedingly rare. We report the successful treatment of an infected right external iliac artery pseudo aneurysm in the 1setting of acute appendicitis. PRESENTATION OF CASE: The patient is an 83-year-old male who presents with severe sepsis, right lower quadrant and right leg pain. Additional past medical history is significant for rectal cancer status post resection and radiation therapy in 1997...
March 4, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28154107/impact-of-social-and-built-environment-factors-on-body-size-among-breast-cancer-survivors-the-pathways-study
#9
EDITORIAL
Salma Shariff-Marco, Julie Von Behren, Peggy Reynolds, Theresa H M Keegan, Andrew Hertz, Marilyn L Kwan, Janise M Roh, Catherine Thomsen, Candyce H Kroenke, Christine Ambrosone, Lawrence H Kushi, Scarlett Lin Gomez
Background: As social and built environment factors have been shown to be associated with physical activity, dietary patterns, and obesity in the general population, they likely also influence these health behaviors among cancer survivors and thereby impact survivorship outcomes.Methods: Enhancing the rich, individual-level survey and medical record data from 4,505 breast cancer survivors in the Pathways Study, a prospective cohort drawn from Kaiser Permanente Northern California, we geocoded baseline residential addresses and appended social and built environment data...
April 2017: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/28133078/-a-case-of-curatively-resected-goblet-cell-carcinoid-of-the-appendix-diagnosed-via-intraoperative-frozen-sectional-examination
#10
Tomoya Ikeda, Junichiro Yamauchi, Kento Miyazaki, Sho Yasuta, Shota Fujita, Mamoru Satoh, Keiichi Shirasaki, Shin Kobayashi, Takashi Ajiki, Katsuo Tsuchihara, Noriko Kondo, Shuichi Ishiyama
A 52-year-old patient presented with epigastric pain.An enhanced CT scan showed a strongly enhanced appendix with abscess formation.Appendectomy was performed under the diagnosis of acute appendicitis with perityphlitic abscess.The stump of the appendix was white and hard, suggesting malignant transformation.Intraoperative frozen sectional examination indicated goblet cell carcinoid(GCC)of the appendix.Thereafter, we performed ileocecal resection with lymphadenectomy (D3).The final pathological diagnosis was GCC, pSS, pN1, Stage III a by the Japanese classification of colorectal carcinoma...
November 2016: Gan to Kagaku Ryoho. Cancer & Chemotherapy
https://www.readbyqxmd.com/read/28121030/the-gut-microbiome-and-the-mechanism-of-surgical-infection
#11
REVIEW
J C Alverdy, S K Hyoju, M Weigerinck, J A Gilbert
BACKGROUND: Since the very early days of surgical practice, surgeons have recognized the importance of considering that intestinal microbes might have a profound influence on recovery from surgical diseases such as appendicitis and peritonitis. Although the pathogenesis of surgical diseases such as cholelithiasis, diverticulosis, peptic ulcer disease and cancer have been viewed as disorders of host biology, they are emerging as diseases highly influenced by their surrounding microbiota...
January 2017: British Journal of Surgery
https://www.readbyqxmd.com/read/28091700/computed-tomography-localization-of-the-appendix-in-the-pediatric-population-relative-to-the-lumbar-spine
#12
John Davis, Albert T Roh, Matthew B Petterson, Tammy R Kopelman, Samantha L Matz, Daniel G Gridley, Mary J Connell
BACKGROUND: Computed tomography (CT) is commonly used to evaluate suspected acute appendicitis. Although very effective, CT uses ionizing radiation, exposing patients to an increased risk of cancer. OBJECTIVE: This study assessed the potential for decreasing the field of view of the CT (and therefore the dose to the patient) in the evaluation of suspected acute appendicitis in children. MATERIALS AND METHODS: This study was a retrospective review of prospectively collected data from 212 consecutive patients who underwent CT for suspected acute appendicitis...
January 14, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28088862/self-assembling-peptide-epitopes-as-novel-platform-for-anticancer-vaccination
#13
Mazda Rad-Malekshahi, Marieke F Fransen, Małgorzata Krawczyk, Mercedeh Mansourian, Meriem Bourajjaj, Jian Chen, Ferry Ossendorp, Wim E Hennink, Enrico Mastrobattista, Maryam Amidi
The aim of the present study was to improve the immunogenicity of peptide epitope vaccines using novel nanocarriers based on self-assembling materials. Several studies demonstrated that peptide antigens in nanoparticulate form induce stronger immune responses than their soluble forms. However, several issues such as poor loading and risk of inducing T cell anergy due to premature release of antigenic epitopes have challenged the clinical success of such systems. In the present study, we developed two vaccine delivery systems by appending a self-assembling peptide (Ac-AAVVLLLW-COOH) or a thermosensitive polymer poly(N-isopropylacrylamide (pNIPAm) to the N-terminus of different peptide antigens (OVA250-264, HPV-E743-57) to generate self-assembling peptide epitopes (SAPEs)...
May 1, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28048838/su-f-i-36-in-utero-dose-measurements-within-postmortem-subjects-for-estimating-fetal-doses-in-pregnant-patients-examined-with-pulmonary-embolism-trauma-and-appendicitis-ct
#14
I Lipnharski, N Quails, C Carranza, N Correa, S Bidari, M Bickelhaup, L Rill, M Arreola
PURPOSE: The imaging of pregnant patients is medically necessary in certain clinical situations. The purpose of this work was to directly measure uterine doses in a cadaver scanned with CT protocols commonly performed on pregnant patients in order to estimate fetal dose and assess potential risk. METHOD: One postmortem subject was scanned on a 320-slice CT scanner with standard pulmonary embolism, trauma, and appendicitis protocols. All protocols were performed with the scan parameters and ranges currently used in clinical practice...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27998075/biotin-decorated-gold-nanoparticles-for-targeted-delivery-of-a-smart-linked-anticancer-active-copper-complex-in-vitro-and-in-vivo-studies
#15
Anup K Pramanik, Siddikuzzaman, Duraippandi Palanimuthu, Kumaravel Somasundaram, Ashoka G Samuelson
The synthesis and anticancer activity of a copper(II) diacetyl-bis(N4-methylthiosemicarbazone) complex and its nanoconjugates are reported. The copper(II) complex is connected to a carboxylic acid group through a cleavable disulfide link to enable smart delivery. The copper complex is tethered to highly water-soluble 20 nm gold nanoparticles (AuNPs), stabilized by amine terminated lipoic acid-polyethylene glycol (PEG). The gold nanoparticle carrier was further decorated with biotin to achieve targeted action...
December 21, 2016: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/27929173/novel-mitochondria-targeted-copper-ii-complexes-of-ferrocenyl-terpyridine-and-anticancer-active-8-hydroxyquinolines-showing-remarkable-cytotoxicity-dna-and-protein-binding-affinity
#16
Banashree Deka, Tukki Sarkar, Samya Banerjee, Arun Kumar, Sanjoy Mukherjee, Sasanka Deka, Kandarpa K Saikia, Akhtar Hussain
Metal complexes with organelle specificity and potent but selective cytotoxicity are highly desirable. In this work, we report the synthesis, characterization and cytotoxicity of six novel copper(ii) complexes of the formula [Cu(R-tpy)(N-O)]NO3 (1-6), where R-tpy is 4'-phenyl-2,2':6',2''-terpyridine (Ph-tpy; 1-3) or 4'-ferrocenyl-2,2':6',2''-terpyridine (Fc-tpy; 4-6), N-O is the anion of 8-hydroxyquinoline (HQ in 1, 4), 5-chloro-7-iodo-8-hydroxyquinoline (CQ in 2, 5) or 5-nitro-8-hydroxyquinoline (NQ in 3, 6)...
January 3, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27919658/quinolizinium-as-a-new-fluorescent-lysosomotropic-probe
#17
Emmanouil Zacharioudakis, Tatiana Cañeque, Raúl Custodio, Sebastian Müller, Ana M Cuadro, Juan J Vaquero, Raphaël Rodriguez
We have synthesized a collection of quinolizinium fluorescent dyes for the purpose of cell imaging. Preliminary biological studies in human U2OS osteosarcoma cancer cells have shown that different functional groups appended to the cationic quinolizinium scaffold efficiently modulate photophysical properties but also cellular distribution. While quinolizinium probes are known nuclear staining reagents, we have identified a particular quinolizinium derivative salt that targets the lysosomal compartment. This finding raises the question of predictability of specific organelle targeting from structural features of small molecules...
January 15, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/27847444/synthesis-characterization-and-biological-studies-of-a-piperidinyl-appended-dipicolylamine-ligand-and-its-rhenium-tricarbonyl-complex-as-potential-therapeutic-agents-for-human-breast-cancer
#18
Amali Subasinghe, Inoka C Perera, Svetlana Pakhomova, Theshini Perera
A novel ligand bearing a central piperidinyl sulfonamide group, N(SO2pip)dpa, and its corresponding Re tricarbonyl complex, [Re(CO)3(N(SO2pip)dpa)](+), have been synthesized in good yield. The methylene CH2 signal seen as a singlet (4.54 ppm) in a (1)H NMR spectrum of the ligand in DMSO-d6 appears as two doublets (5.39, 5.01 ppm) in a spectrum of the [Re(CO)3(N(SO2pip)dpa)](+) complex and confirms the presence of magnetically nonequivalent protons upon coordination to Re. Structural results revealed that the Re-N bond lengths fall within the normal range establishing coordination of ligand to metal...
2016: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/27782276/regioselective-synthesis-of-naphthoquinone-naphthoquinol-carbohydrate-hybrids-by-4-2-anionic-annulations-and-studies-on-their-cytotoxicity
#19
Soumen Chakraborty, Gaurav Das, Surajit Ghosh, Dipakranjan Mal
An efficient and regioselective synthetic route to naphthoquinone/naphthoquinol-carbohydrate hybrids has been developed. It is based upon anionic annulation of 3-nucleofugalphthalides with an acrylate appended sugar moiety. In each of the annulations studied, the arene-carbohydrate hybrids were obtained in good to excellent yields. The in vitro cytotoxic activity of the synthetic naphthoquinone/naphthonol-carbohydrate hybrids were evaluated against the human cervical cancer cell line (HeLa), and a few of them were found to exhibit potent anticancer activity against the cell line...
December 7, 2016: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/27779999/appendicitis-in-cancer-patients-is-often-observed-and-can-represent-appendiceal-malignancy
#20
David Santos, Yi-Ju Chiang, Brian Badgwell
Appendectomy is standard of care for uncomplicated appendicitis, but cancer patients may not be optimal surgical candidates. Interval appendectomy is controversial, and appendiceal malignancy is rare. Study objectives were to review the role of surgery, observation, and interventional radiology (IR)-guided drainage in patients with appendicitis and advanced malignancy. Retrospective review was performed on cancer patients presenting to a tertiary academic cancer center from January 1, 2001 to December 31, 2014...
October 2016: American Surgeon
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