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Nigam R, Field M, Harris G, Barton M, Carolan M, Metcalfe P, Holloway L. Automated detection, delineation and quantification of whole-body bone metastasis using FDG-PET/CT images. Phys Eng Sci Med 2023; 46:851-863. [PMID: 37126152 DOI: 10.1007/s13246-023-01258-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Accepted: 04/11/2023] [Indexed: 05/02/2023]
Abstract
Non-small cell lung cancer (NSCLC) patients with the metastatic spread of disease to the bone have high morbidity and mortality. Stereotactic ablative body radiotherapy increases the progression free survival and overall survival of these patients with oligometastases. FDG-PET/CT, a functional imaging technique combining positron emission tomography (PET) with 18 F-fluorodeoxyglucose (FDG) and computer tomography (CT) provides improved staging and identification of treatment response. It is also associated with reduction in size of the radiotherapy tumour volume delineation compared with CT based contouring in radiotherapy, thus allowing for dose escalation to the target volume with lower doses to the surrounding organs at risk. FDG-PET/CT is increasingly being used for the clinical management of NSCLC patients undergoing radiotherapy and has shown high sensitivity and specificity for the detection of bone metastases in these patients. Here, we present a software tool for detection, delineation and quantification of bone metastases using FDG-PET/CT images. The tool extracts standardised uptake values (SUV) from FDG-PET images for auto-segmentation of bone lesions and calculates volume of each lesion and associated mean and maximum SUV. The tool also allows automatic statistical validation of the auto-segmented bone lesions against the manual contours of a radiation oncologist. A retrospective review of FDG-PET/CT scans of more than 30 candidate NSCLC patients was performed and nine patients with one or more metastatic bone lesions were selected for the present study. The SUV threshold prediction model was designed by splitting the cohort of patients into a subset of 'development' and 'validation' cohorts. The development cohort yielded an optimum SUV threshold of 3.0 for automatic detection of bone metastases using FDG-PET/CT images. The validity of the derived optimum SUV threshold on the validation cohort demonstrated that auto-segmented and manually contoured bone lesions showed strong concordance for volume of bone lesion (r = 0.993) and number of detected lesions (r = 0.996). The tool has various applications in radiotherapy, including but not limited to studies determining optimum SUV threshold for accurate and standardised delineation of bone lesions and in scientific studies utilising large patient populations for instance for investigation of the number of metastatic lesions that can be treated safety with an ablative dose of radiotherapy without exceeding the normal tissue toxicity.
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Affiliation(s)
- R Nigam
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, 2522, Australia.
- Ingham Institute for Applied Medical Research, Liverpool, NSW, 2170, Australia.
- Illawarra Cancer Care Centre, Wollongong Hospital, Wollongong, NSW, 2500, Australia.
| | - M Field
- Ingham Institute for Applied Medical Research, Liverpool, NSW, 2170, Australia
- Liverpool and Macarthur Cancer Therapy Centre, Liverpool, NSW, 2170, Australia
- South Western Sydney Clinical Campus, School of Clinical Medicine, University of New South Wales, Sydney, NSW, Australia
| | - G Harris
- Chris O'Brien Lifehouse, Camperdown, NSW, 2050, Australia
| | - M Barton
- Ingham Institute for Applied Medical Research, Liverpool, NSW, 2170, Australia
- Liverpool and Macarthur Cancer Therapy Centre, Liverpool, NSW, 2170, Australia
- South Western Sydney Clinical Campus, School of Clinical Medicine, University of New South Wales, Sydney, NSW, Australia
| | - M Carolan
- Illawarra Cancer Care Centre, Wollongong Hospital, Wollongong, NSW, 2500, Australia
| | - P Metcalfe
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, 2522, Australia
- Ingham Institute for Applied Medical Research, Liverpool, NSW, 2170, Australia
| | - L Holloway
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, 2522, Australia
- Ingham Institute for Applied Medical Research, Liverpool, NSW, 2170, Australia
- Liverpool and Macarthur Cancer Therapy Centre, Liverpool, NSW, 2170, Australia
- South Western Sydney Clinical Campus, School of Clinical Medicine, University of New South Wales, Sydney, NSW, Australia
- Institute of Medical Physics, University of Sydney, Camperdown, NSW, 2505, Australia
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Mackenzie P, Vajdic C, Delaney G, Comans T, Agar M, Gabriel G, Barton M. Development of an Age- and Comorbidity- Adjusted Optimal Radiotherapy Utilisation Rate for Patients with Lung Cancer. J Geriatr Oncol 2022. [DOI: 10.1016/s1879-4068(22)00255-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Barton M, Puchferran C, Kattan A, Pennix T, Sanan A, Venkat S, Bhatia S, Zikria J. Abstract No. 386 Comparing pre-procedure imaging versus direct stick venography for low flow vascular arterio-venous malformations. J Vasc Interv Radiol 2022. [DOI: 10.1016/j.jvir.2022.03.467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Mackenzie P, Vajdic C, Delaney G, Comans T, Agar M, Gabriel G, Barton M. OC-0921 Age- and Comorbidity- Adjusted Optimal Radiotherapy Utilisation Rate for Women with Breast Cancer. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02701-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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5
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Barton M, Batumalai V, Spencer K. Health Economic and Health Service Issues of Palliative Radiotherapy. Clin Oncol (R Coll Radiol) 2020; 32:775-780. [DOI: 10.1016/j.clon.2020.06.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 05/19/2020] [Accepted: 06/18/2020] [Indexed: 01/31/2023]
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Polo Rubio J, Zubizarreta E, Lievens Y, Barton M, Rodin D, Jake V, Grover S, Abdel-Wahab M. OC-0077: Factors Associated with the Global Availability of Radiotherapy Services: an IAEA analysis. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)00103-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Harrington R, Roberts B, Rainis D, Yin Y, Saunders R, Barton M. Putting Quality Metrics in Context: A Novel Index Approach to Measuring Inpatient Utilization. Health Serv Res 2020. [DOI: 10.1111/1475-6773.13459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Affiliation(s)
- R. Harrington
- National Committee for Quality Assurance (NCQA) Washington DC United States
| | - B. Roberts
- National Committee for Quality Assurance Washington DC United States
| | - D. Rainis
- National Committee for Quality Assurance (NCQA) Washington DC United States
| | - Y. Yin
- National Committee for Quality Assurance (NCQA) Washington DC United States
| | - R. Saunders
- KNG Health Consulting LLC Washington DC United States
| | - M. Barton
- National Committee for Quality Assurance (NCQA) Washington DC United States
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Yap ML, O'Connell DL, Goldsbury D, Weber M, Barton M. Factors Associated With Radiotherapy Utilisation In New South Wales, Australia: Results From The 45 and Up Study. Clin Oncol (R Coll Radiol) 2020; 32:282-291. [PMID: 32007353 DOI: 10.1016/j.clon.2020.01.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 12/03/2019] [Accepted: 12/09/2019] [Indexed: 12/28/2022]
Abstract
AIMS Actual radiotherapy utilisation rates tend to be lower than the estimated optimal rates. Little is known about the factors contributing to this difference. Our aim was to identify factors associated with radiotherapy receipt for a cohort of cancer patients in New South Wales (NSW), Australia. MATERIALS AND METHODS In total, 267 153 participants in the NSW 45 and Up Study completed a questionnaire during 2006-2009 providing detailed health and socio-demographic information and consented to record linkage with administrative health datasets. Single primary cancers diagnosed after study enrolment were identified through linkage with the NSW Cancer Registry to December 2013. Radiotherapy receipt was determined from claims to the Medicare Benefits Schedule and/or records in the NSW Admitted Patient Data Collection (2006 to June 2016). Competing risks regression was used to examine associations between health and socio-demographic characteristics and radiotherapy treatment. RESULTS Of 17 873 patients with an incident cancer, 5414 (30.3%) received radiotherapy during follow-up (median 5.3 years). Patients less likely to receive radiotherapy were aged <60 or 80+ years, female, had a Charlson co-morbidity index of 1+, needed help with daily tasks or lived ≥100 km from the nearest radiotherapy centre. CONCLUSION Distinct subgroups of patients are less likely to receive radiotherapy. Advocacy and/or policy changes are needed to improve access.
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Affiliation(s)
- M L Yap
- Collaboration for Cancer Outcomes, Research and Evaluation (CCORE), Ingham Institute for Applied Medical Research, UNSW Sydney, Liverpool, NSW, Australia; Liverpool and Macarthur Cancer Therapy Centres, Liverpool, NSW, Australia; School of Medicine, Western Sydney University, Campbelltown, NSW, Australia; Cancer Research Division, Cancer Council NSW, Kings Cross, NSW, Australia; Sydney Medical School - Public Health, University of Sydney, Sydney, NSW, Australia.
| | - D L O'Connell
- Cancer Research Division, Cancer Council NSW, Kings Cross, NSW, Australia; Sydney Medical School - Public Health, University of Sydney, Sydney, NSW, Australia; School of Medicine and Public Health, University of Newcastle, Newcastle, NSW, Australia
| | - D Goldsbury
- Cancer Research Division, Cancer Council NSW, Kings Cross, NSW, Australia
| | - M Weber
- Cancer Research Division, Cancer Council NSW, Kings Cross, NSW, Australia; Sydney Medical School - Public Health, University of Sydney, Sydney, NSW, Australia
| | - M Barton
- Collaboration for Cancer Outcomes, Research and Evaluation (CCORE), Ingham Institute for Applied Medical Research, UNSW Sydney, Liverpool, NSW, Australia; Liverpool and Macarthur Cancer Therapy Centres, Liverpool, NSW, Australia
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Swenson D, Blauer J, Taepke R, Kwan E, Ghafoori E, Barton M, Tate J, Coles J, MacLeod R, Degroot P, Ranjan R. P6555A self-adaptive approach to antitachycardia pacing - a head to head comparison using advanced computational modeling. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.1145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Antitachycardia pacing (ATP) for monomorphic VT (MVT) reduces painful defibrillation shocks. Most ICD-treated ventricular arrhythmias are MVT, suggesting an opportunity for improved ATP to decrease shocks. We report on a new algorithm (Yee, Circ AE 2017) that uses electrophysiologic (EP) first-principles to design ATP sequences in real-time. Heart-rate history is used to design the first ATP sequence, and failed ATP post-pacing interval is used to design later sequences.
Purpose
The purpose of this modeling study was to understand how this new ATP algorithm would perform in a head-to-head comparison with traditional burst ATP. Modeling allows direct comparison of the two algorithms in identical, realistic, patient-derived cardiac arrythmias.
Methods
Patient-specific late gadolinium enhanced MRI and EP data were used to build an adjudicated cohort of realistic numerical heart models with varied EP, infarct, border zone. Publicly available EP modeling software CARPentry was used to calculate sustained reentrant VT initiated with the programmed electrical stimulation used to induce VT clinically. The VTs were physician-adjudicated to validate models. Burst ATP was 3 sequences of 8 pulses at 88% of VT cycle length, each decremented by 10ms. The new ATP was limited to 3 automatically designed sequences.
Results
Three hundred unique VT scenarios were generated from 6 human hearts with multiple VT circuits, 5 electrophysiologic states, and 10 pacing locations. Burst ATP terminated 168/300 VTs (56%) and accelerated 2.7%. The new ATP terminated 234/300 VTs (78%) with the same acceleration. The two dominant ATP failure mechanisms were identified as 1) insufficient prematurity to close the excitable gap, and 2) failure to reach the critical isthmus of the VT circuit. For these mechanisms, the new ATP algorithm reduce failures from 64 to 28 (44% reduction) without increasing acceleration.
Conclusion
The new automated ATP algorithm successfully adapted ATP sequences for VT episodes that burst ATP failed to terminate. The new ATP was successful even with complex scar geometries and electrophysiology heterogeneity as seen in the real world.
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Affiliation(s)
- D Swenson
- Medtronic, Minneapolis, United States of America
| | - J Blauer
- Medtronic, Minneapolis, United States of America
| | - R Taepke
- Medtronic, Minneapolis, United States of America
| | - E Kwan
- University of Utah, Div of Cardiovascular Medicine, Salt Lake City, United States of America
| | - E Ghafoori
- University of Utah, Div of Cardiovascular Medicine, Salt Lake City, United States of America
| | - M Barton
- Medtronic, Minneapolis, United States of America
| | - J Tate
- University of Utah, Salt Lake City, United States of America
| | - J Coles
- Medtronic, Minneapolis, United States of America
| | - R MacLeod
- University of Utah, Salt Lake City, United States of America
| | - P Degroot
- University of Utah, Salt Lake City, United States of America
| | - R Ranjan
- University of Utah, Div of Cardiovascular Medicine, Salt Lake City, United States of America
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Gabriel G, Barton M, Shafiq J, Delaney G. OC-0158 Effect of EBRT underutilization in prostate cancer on overall survival and local control, NSW, Australia. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)30578-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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11
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Do V, Ng W, Jacob S, Delaney G, Barton M. An estimation of the population-based survival benefit of first-course chemotherapy for advanced incurable cancer. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy440.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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12
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Liney G, Whelan B, Oborn B, Barton M, Keall P. MRI-Linear Accelerator Radiotherapy Systems. Clin Oncol (R Coll Radiol) 2018; 30:686-691. [DOI: 10.1016/j.clon.2018.08.003] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 07/25/2018] [Accepted: 08/20/2018] [Indexed: 12/25/2022]
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13
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Yam C, Seth S, Hess K, Mittendorf E, Murthy R, Damodaran S, Helgason T, Huo L, Thompson A, Barton M, Huang M, Arribas E, Lane D, Rauch G, Adrada B, Gilcrease M, Chang J, Moulder S. Impact of clinical, morphologic and molecular characteristics on response to neoadjuvant systemic therapy (NAST) in metaplastic breast cancer (MpBC). Ann Oncol 2018. [DOI: 10.1093/annonc/mdy270.223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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Barton M, Little HJ, Vaughan-Jones RD, Daniels S, Dashwood MR, Tsui JC. Sidney George Shaw, DPhil (1948-2017). Physiol Res 2018; 67:S27-S35. [PMID: 31774298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023] Open
Abstract
On March 4, 2017 at the age of 68, Sidney George Shaw (Sid) unexpectedly died from complications following surgery, only four years after retiring from the University of Bern. Trained in biochemistry at Oxford University, Sid had quickly moved into molecular pharmacology and became a key investigator in the field of enzyme biochemistry, vasoactive peptide research, and receptor signaling. Sid spent half his life in Switzerland, after moving to the University of Bern in 1984. This article, written by his friends and colleagues who knew him and worked with him during different stages of his career, summarizes his life, his passions, and his achievements in biomedical research. It also includes personal memories relating to a dear friend and outstanding scientist whose intellectual curiosity, humility, and honesty will remain an example to us all.
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Affiliation(s)
- M Barton
- Molecular Internal Medicine, University of Zürich, Zürich, Switzerland. , Division of Surgery and Interventional Science, University College London, Royal Free Campus, London, United Kingdom.
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Liney GP, Dong B, Weber E, Rai R, Destruel A, Garcia-Alvarez R, Manton DJ, Jelen U, Zhang K, Barton M, Keall P, Crozier S. Imaging performance of a dedicated radiation transparent RF coil on a 1.0 Tesla inline MRI-linac. ACTA ACUST UNITED AC 2018; 63:135005. [DOI: 10.1088/1361-6560/aac813] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Yao R, Murtaza M, Velasquez JT, Todorovic M, Rayfield A, Ekberg J, Barton M, St John J. Olfactory Ensheathing Cells for Spinal Cord Injury: Sniffing Out the Issues. Cell Transplant 2018; 27:879-889. [PMID: 29882418 PMCID: PMC6050914 DOI: 10.1177/0963689718779353] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Olfactory ensheathing cells (OECs) are glia reported to sustain the continuous axon extension and successful topographic targeting of the olfactory receptor neurons responsible for the sense of smell (olfaction). Due to this distinctive property, OECs have been trialed in human cell transplant therapies to assist in the repair of central nervous system injuries, particularly those of the spinal cord. Though many studies have reported neurological improvement, the therapy remains inconsistent and requires further improvement. Much of this variability stems from differing olfactory cell populations prior to transplantation into the injury site. While some studies have used purified cells, others have used unpurified transplants. Although both preparations have merits and faults, the latter increases the variability between transplants received by recipients. Without a robust purification procedure in OEC transplantation therapies, the full potential of OECs for spinal cord injury may not be realised.
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Affiliation(s)
- R Yao
- 1 Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia
| | - M Murtaza
- 1 Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia.,2 Menzies Health Institute Queensland, Griffith Health Centre, Griffith University, Gold Coast, Queensland, Australia
| | - J Tello Velasquez
- 1 Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia
| | - M Todorovic
- 1 Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia.,2 Menzies Health Institute Queensland, Griffith Health Centre, Griffith University, Gold Coast, Queensland, Australia
| | - A Rayfield
- 2 Menzies Health Institute Queensland, Griffith Health Centre, Griffith University, Gold Coast, Queensland, Australia
| | - J Ekberg
- 2 Menzies Health Institute Queensland, Griffith Health Centre, Griffith University, Gold Coast, Queensland, Australia
| | - M Barton
- 2 Menzies Health Institute Queensland, Griffith Health Centre, Griffith University, Gold Coast, Queensland, Australia
| | - J St John
- 1 Clem Jones Centre for Neurobiology and Stem Cell Research, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia.,2 Menzies Health Institute Queensland, Griffith Health Centre, Griffith University, Gold Coast, Queensland, Australia
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Pham T, Stait-Gardner T, Lee C, Barton M, Liney G, Wong K, Price W. PO-0979: Ultra-high field MRI for evaluation of rectal cancer stroma ex vivo: correlation with histopathology. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)31289-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Do V, Ng W, Jacob S, Delaney G, Barton M. An estimation of the population survival benefit of first-course chemotherapy for head and neck cancers. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx374.043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Henry M, Roman D, Bardach D, Puhek J, Rehm B, Barton M, Lighter P. IDENTIFYING COMPLEX HIGH NEEDS PATIENT POPULATIONS FOR PERFORMANCE MEASUREMENT STRATIFICATION. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- M. Henry
- NCQA, Washington, District of Columbia
| | - D. Roman
- NCQA, Washington, District of Columbia
| | | | - J. Puhek
- NCQA, Washington, District of Columbia
| | - B. Rehm
- NCQA, Washington, District of Columbia
| | - M. Barton
- NCQA, Washington, District of Columbia
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20
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Liney GP, Dong B, Begg J, Vial P, Zhang K, Lee F, Walker A, Rai R, Causer T, Alnaghy SJ, Oborn BM, Holloway L, Metcalfe P, Barton M, Crozier S, Keall P. Technical Note: Experimental results from a prototype high-field inline MRI-linac. Med Phys 2017; 43:5188. [PMID: 27587049 DOI: 10.1118/1.4961395] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE The pursuit of real-time image guided radiotherapy using optimal tissue contrast has seen the development of several hybrid magnetic resonance imaging (MRI)-treatment systems, high field and low field, and inline and perpendicular configurations. As part of a new MRI-linac program, an MRI scanner was integrated with a linear accelerator to enable investigations of a coupled inline MRI-linac system. This work describes results from a prototype experimental system to demonstrate the feasibility of a high field inline MR-linac. METHODS The magnet is a 1.5 T MRI system (Sonata, Siemens Healthcare) was located in a purpose built radiofrequency (RF) cage enabling shielding from and close proximity to a linear accelerator with inline (and future perpendicular) orientation. A portable linear accelerator (Linatron, Varian) was installed together with a multileaf collimator (Millennium, Varian) to provide dynamic field collimation and the whole assembly built onto a stainless-steel rail system. A series of MRI-linac experiments was performed to investigate (1) image quality with beam on measured using a macropodine (kangaroo) ex vivo phantom; (2) the noise as a function of beam state measured using a 6-channel surface coil array; and (3) electron contamination effects measured using Gafchromic film and an electronic portal imaging device (EPID). RESULTS (1) Image quality was unaffected by the radiation beam with the macropodine phantom image with the beam on being almost identical to the image with the beam off. (2) Noise measured with a surface RF coil produced a 25% elevation of background intensity when the radiation beam was on. (3) Film and EPID measurements demonstrated electron focusing occurring along the centerline of the magnet axis. CONCLUSIONS A proof-of-concept high-field MRI-linac has been built and experimentally characterized. This system has allowed us to establish the efficacy of a high field inline MRI-linac and study a number of the technical challenges and solutions.
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Affiliation(s)
- G P Liney
- Department of Medical Physics, Ingham Institute for Applied Medical Research, Liverpool NSW 2170, Australia; Radiation Physics, Liverpool Cancer Therapy Centre, Liverpool NSW 2170, Australia; School of Medicine, University of New South Wales, Sydney NSW 2170, Australia; and Centre for Medical Radiation Physics, University of Wollongong, NSW 2522, Australia
| | - B Dong
- Department of Medical Physics, Ingham Institute for Applied Medical Research, Liverpool NSW 2170, Australia
| | - J Begg
- Radiation Physics, Liverpool Cancer Therapy Centre, Liverpool NSW 2170, Australia
| | - P Vial
- Radiation Physics & Liverpool Cancer Therapy Centre, Liverpool, NSW 2170, Australia and Radiation Physics Laboratory, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - K Zhang
- Department of Medical Physics, Ingham Institute for Applied Medical Research, Liverpool NSW 2170, Australia
| | - F Lee
- Radiation Physics Laboratory, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - A Walker
- Medical Physics, Ingham Institute for Applied Medical Research, Liverpool, NSW 2170, Australia and Radiation Physics, Liverpool Cancer Therapy Centre, Liverpool NSW 2170, Australia
| | - R Rai
- Medical Physics, Ingham Institute for Applied Medical Research, Liverpool, NSW 2170, Australia and Radiation Physics, Liverpool Cancer Therapy Centre, Liverpool NSW 2170, Australia
| | - T Causer
- Centre for Medical Radiation Physics, University of Wollongong, NSW 2522, Australia
| | - S J Alnaghy
- Centre for Medical Radiation Physics, University of Wollongong, NSW 2522, Australia
| | - B M Oborn
- Centre for Medical Radiation Physics, University of Wollongong, NSW 2522, Australia and Illawarra Cancer Care Centre, Wollongong Hospital, NSW 2500, Australia
| | - L Holloway
- Department of Medical Physics, Ingham Institute for Applied Medical Research, Liverpool NSW 2170, Australia; Radiation Physics, Liverpool Cancer Therapy Centre, Liverpool NSW 2170, Australia; School of Medicine, University of New South Wales, Sydney NSW 2170, Australia; Centre for Medical Radiation Physics, University of Wollongong, NSW 2522, Australia; and Radiation Physics Laboratory, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - P Metcalfe
- Centre for Medical Radiation Physics, University of Wollongong, NSW 2522, Australia
| | - M Barton
- Department of Medical Physics, Ingham Institute for Applied Medical Research, Liverpool NSW 2170, Australia and School of Medicine, University of New South Wales, Sydney NSW 2170, Australia
| | - S Crozier
- School of Information Technology & Electrical Engineering, University of Queensland, Brisbane, QLD 4072, Australia
| | - P Keall
- Radiation Physics Laboratory, Sydney Medical School, University of Sydney, Sydney NSW 2170, Australia
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Abstract
Abstract
Long non coding RNAs (lncRNAs) have been identified as regulators of the cell cycle, apoptosis, and DNA damage among other processes that if deregulated, may lead to cancer by acting as proto-oncogenes, tumor suppressor genes, and drivers of metastatic transformation. Using RNA sequencing we have identified 42 differentially expressed lncRNAs from a healthy cohort of parous vs. nulliparous women. After bioinformatics and RT-qPCR analysis, we have focused on a vaguely studied lncRNA called BC200 that is highly expressed in the nulliparous postmenopausal breast tissue. It is known that BC200 lncRNA is overexpressed in invasive and pre-invasive breast cancer; however, its functional role in the initiation and progression of breast cancer is poorly understood. In the present work we provide insight on the role of BC200 in the context of luminal and triple negative breast cancer (TNBC). We have confirmed that BC200 is highly expressed in breast cancer tissue and in widely used breast cancer cell lines such as MCF7, T47D, MDAMB231, and Hs578T. Using a lentiviral system we successfully obtained cell lines which stably express BC200. Overexpression of BC200 increases proliferation, migration, and invasion potential in vitro in the cell lines tested, specifically luminal T47D and TNBC MDAMB231. Xenograft studies performed in the mammary fat pad of female SCID mice confirm the role of BC200 as a tumor promoter. Tumors in mice injected with MDAMB231 cells overexpressing BC200 were 4.5 times bigger than tumors in the control group in only 6 weeks when injecting 1 million cells. Moreover, we have determined, using reverse transcriptase PCR targeting genes less than 200 kb from the start site of BC200, that when BC200 is overexpressed, CALM2 is downregulated in both T47D and MDAMB231 cell lines. CALM2 or Calmodulin is a calcium binding protein that plays a role in signaling pathways, cell cycle progression, proliferation, and apoptosis. Mutations in CALM2 are associated with increased risk of breast cancer. Our positive results on Cis regulation are being expanded using chromatin isolation by RNA immunoprecipitation to determine BC200's genome wide regulation.
These results demonstrate the participation of BC200 lncRNA in the progression of breast cancer. Notably, BC200 regulates nearby genes that have an implication in cancer progression. BC200, identified in the normal breast tissue of nulliparous women, not only plays a key role in breast cancer progression but also provides a new insight in the preventive role of pregnancy by the downregulation of the expression of this lncRNA in the normal parous breast. [This work was supported by the NCI (National Cancer Institute) Core Grant CA06927 to Fox Chase Cancer Center and generous support from Christian - Diane Martin, the Flyers Wives, and Joseph - Barbara Breitman to Dr. J. Russo, MD].
Citation Format: Barton M, Santucci-Pereira J, Su Y, Russo J. BC200 lncRNA is involved in the progression of triple negative breast cancer [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P1-08-06.
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Affiliation(s)
- M Barton
- Temple University School of Medicine, Philadelphia, PA; Fox Chase Cancer Center, Philadelphia, PA
| | - J Santucci-Pereira
- Temple University School of Medicine, Philadelphia, PA; Fox Chase Cancer Center, Philadelphia, PA
| | - Y Su
- Temple University School of Medicine, Philadelphia, PA; Fox Chase Cancer Center, Philadelphia, PA
| | - J Russo
- Temple University School of Medicine, Philadelphia, PA; Fox Chase Cancer Center, Philadelphia, PA
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Yap ML, Hanna TP, Shafiq J, Ferlay J, Bray F, Delaney GP, Barton M. The Benefits of Providing External Beam Radiotherapy in Low- and Middle-income Countries. Clin Oncol (R Coll Radiol) 2017; 29:72-83. [PMID: 27916340 DOI: 10.1016/j.clon.2016.11.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 11/07/2016] [Accepted: 11/07/2016] [Indexed: 01/04/2023]
Abstract
More than half of all cancer diagnoses worldwide occur in low- and middle-income countries (LMICs) and the incidence is projected to rise substantially within the next 20 years. Radiotherapy is a vital, cost-effective treatment for cancer; yet there is currently a huge deficit in radiotherapy services within these countries. The aim of this study was to estimate the potential outcome benefits if external beam radiotherapy was provided to all patients requiring such treatment in LMICs, according to the current evidence-based guidelines. Projected estimates of these benefits were calculated to 2035, obtained by applying the previously published Collaboration for Cancer Outcomes, Research and Evaluation (CCORE) demand and outcome benefit estimates to cancer incidence and projection data from the GLOBOCAN 2012 data. The estimated optimal radiotherapy utilisation rate for all LMICs was 50%. There were about 4.0 million cancer patients in LMICs who required radiotherapy in 2012. This number is projected to increase by 78% by 2035, a far steeper increase than the 38% increase expected in high-income countries. National radiotherapy benefits varied widely, and were influenced by case mix. The 5 year population local control and survival benefits for all LMICs, if radiotherapy was delivered according to guidelines, were estimated to be 9.6% and 4.4%, respectively, compared with no radiotherapy use. This equates to about 1.3 million patients who would derive a local control benefit in 2035, whereas over 615 000 patients would derive a survival benefit if the demand for radiotherapy in LMICs was met. The potential outcome benefits were found to be higher in LMICs. These results further highlight the urgent need to reduce the gap between the supply of, and demand for, radiotherapy in LMICs. We must attempt to address this 'silent crisis' as a matter of priority and the approach must consider the complex societal challenges unique to LMICs.
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Affiliation(s)
- M L Yap
- Ingham Institute for Applied Medical Research, University of New South Wales, Liverpool, New South Wales, Australia; Liverpool and Macarthur Cancer Therapy Centres, Western Sydney University, Campbelltown, New South Wales, Australia.
| | - T P Hanna
- Ingham Institute for Applied Medical Research, University of New South Wales, Liverpool, New South Wales, Australia; Division of Cancer Care and Epidemiology, Queen's University Cancer Research Institute, Kingston, Ontario, Canada
| | - J Shafiq
- Ingham Institute for Applied Medical Research, University of New South Wales, Liverpool, New South Wales, Australia
| | - J Ferlay
- International Agency for Research on Cancer, Lyon, France
| | - F Bray
- International Agency for Research on Cancer, Lyon, France
| | - G P Delaney
- Ingham Institute for Applied Medical Research, University of New South Wales, Liverpool, New South Wales, Australia; Liverpool and Macarthur Cancer Therapy Centres, Western Sydney University, Campbelltown, New South Wales, Australia
| | - M Barton
- Ingham Institute for Applied Medical Research, University of New South Wales, Liverpool, New South Wales, Australia
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Marecek R, Lamos M, Mikl M, Barton M, Fajkus J, Rektor, Brazdil M. What can be found in scalp EEG spectrum beyond common frequency bands. EEG-fMRI study. J Neural Eng 2016; 13:046026. [PMID: 27432759 DOI: 10.1088/1741-2560/13/4/046026] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVE The scalp EEG spectrum is a frequently used marker of neural activity. Commonly, the preprocessing of EEG utilizes constraints, e.g. dealing with a predefined subset of electrodes or a predefined frequency band of interest. Such treatment of the EEG spectrum neglects the fact that particular neural processes may be reflected in several frequency bands and/or several electrodes concurrently, and can overlook the complexity of the structure of the EEG spectrum. APPROACH We showed that the EEG spectrum structure can be described by parallel factor analysis (PARAFAC), a method which blindly uncovers the spatial-temporal-spectral patterns of EEG. We used an algorithm based on variational Bayesian statistics to reveal nine patterns from the EEG of 38 healthy subjects, acquired during a semantic decision task. The patterns reflected neural activity synchronized across theta, alpha, beta and gamma bands and spread over many electrodes, as well as various EEG artifacts. MAIN RESULTS Specifically, one of the patterns showed significant correlation with the stimuli timing. The correlation was higher when compared to commonly used models of neural activity (power fluctuations in distinct frequency band averaged across a subset of electrodes) and we found significantly correlated hemodynamic fluctuations in simultaneously acquired fMRI data in regions known to be involved in speech processing. Further, we show that the pattern also occurs in EEG data which were acquired outside the MR machine. Two other patterns reflected brain rhythms linked to the attentional and basal ganglia large scale networks. The other patterns were related to various EEG artifacts. SIGNIFICANCE These results show that PARAFAC blindly identifies neural activity in the EEG spectrum and that it naturally handles the correlations among frequency bands and electrodes. We conclude that PARAFAC seems to be a powerful tool for analysis of the EEG spectrum and might bring novel insight to the relationships between EEG activity and brain hemodynamics.
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Affiliation(s)
- R Marecek
- CEITEC-Central European Institute of Technology, Masaryk University, Kamenice 5, 62500, Brno, Czech Republic
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Abstract
In premenopausal women, endogenous estrogens are associated with reduced prevalence of arterial hypertension, coronary artery disease, myocardial infarction, and stroke. Clinical trials conducted in the 1990s such as HERS, WHI, and WISDOM have shown that postmenopausal treatment with horse hormone mixtures (so-called conjugated equine estrogens) and synthetic progestins adversely affects female cardiovascular health. Our understanding of rapid (nongenomic) and chronic (genomic) estrogen signaling has since advanced considerably, including identification of a new G protein-coupled estrogen receptor (GPER), which like the "classical" receptors ERα and ERβ is highly abundant in the cardiovascular system. Here, we discuss the role of estrogen receptors in the pathogenesis of coronary artery disease and review natural and synthetic ligands of estrogen receptors as well as their effects in physiology, on cardiovascular risk factors, and atherosclerotic vascular disease. Data from preclinical and clinical studies using nonselective compounds activating GPER, which include selective estrogen receptor modulators such as tamoxifen or raloxifene, selective estrogen receptor downregulators such as Faslodex™ (fulvestrant/ICI 182,780), vitamin B3 (niacin), green tea catechins, and soy flavonoids such as genistein or resveratrol, strongly suggest that activation of GPER may afford therapeutic benefit for primary and secondary prevention in patients with or at risk for coronary artery disease. Evidence from preclinical studies suggest similar efficacy profiles for selective small molecule GPER agonists such as G-1 which are devoid of uterotrophic activity. Further clinical research in this area is warranted to provide opportunities for future cardiovascular drug development.
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Affiliation(s)
- M R Meyer
- Triemli City Hospital, Zürich, Switzerland.
| | - M Barton
- Molecular Internal Medicine, University of Zürich, Zürich, Switzerland.
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Trotman H, Barton M, Mitchell V. Outcome of neonates ventilated in the main intensive care unit at The University Hospital of the West Indies: a 15-year experience. Trop Doct 2016; 37:249-50. [DOI: 10.1258/004947507782332964] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A 15-year retrospective review of neonates ventilated in the main intensive care unit at the University Hospital of the West Indies was conducted. During the study period, 153 neonates were ventilated, of whom 80 (52%) survived. The most common reason for admission was respiratory distress syndrome, which accounted for 67% (102/153) of admissions, 53 (52%) of these infants survived. Improving outcome will require strategies directed at improving neonatal intensive care.
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Affiliation(s)
- H Trotman
- Department of Obstetrics, Gynaecology and Child Health
| | - M Barton
- Department of Surgery, Radiology, Anaesthesia and Intensive Care, University of the West Indies, Mona, Kingston 7, Jamaica
| | - V Mitchell
- Department of Obstetrics, Gynaecology and Child Health
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Keall P, Dong B, Vial P, Walker A, Zhang K, Begg J, Rai R, Holloway L, Barton M, Crozier S, Liney G. TH-AB-BRA-12: Experimental Results From the First High-Field Inline MRI-Linac. Med Phys 2016. [DOI: 10.1118/1.4958064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Borras J, Lievens Y, Barton M, Corral J, Ferlay J, Bray F, Grau C. OC-0331: How many new cancer patients in Europe will require radiotherapy by 2025? An ESTRO-HERO analysis. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)31580-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Whelan B, Welgampola M, McGarvie L, Makhija K, Feain I, Holloway L, Berry M, Barton M, Turner R, Jackson M, Keall P. EP-1930: Cancer patient experience of slow, single arc rotation to simplify radiation therapy delivery. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)33181-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Barton M, Marecek R, Rektor I, Filip P, Janousova E, Mikl M. Sensitivity of PPI analysis to differences in noise reduction strategies. J Neurosci Methods 2015; 253:218-32. [DOI: 10.1016/j.jneumeth.2015.06.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 06/29/2015] [Accepted: 06/30/2015] [Indexed: 11/30/2022]
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Forbes J, Barton M. 56: Neurodevelopmental Outcome of Survivors of Neonatal Candidiasis: A Systematic Review. Paediatr Child Health 2015. [DOI: 10.1093/pch/20.5.e53a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Barton M, Shen A, O'Brien K, Robinson J, Davies D, Simpson K, Asztalos E, Langley J, Le Saux N, Sauve R, Synnes A, Tan B, de Repentigny L, Rubin E, Hui C, Kovacs L, Yau Y, Richardson S. 55: Early Onset Neonatal Candidiasis in Preterm Infants: Perinatal Factors, Disease Severity and Outcome. Paediatr Child Health 2015. [DOI: 10.1093/pch/20.5.e53] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mawad D, Warren C, Barton M, Mahns D, Morley J, Pham BT, Pham NT, Kueh S, Lauto A. Lysozyme depolymerization of photo-activated chitosan adhesive films. Carbohydr Polym 2015; 121:56-63. [DOI: 10.1016/j.carbpol.2014.12.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2014] [Revised: 12/08/2014] [Accepted: 12/10/2014] [Indexed: 02/07/2023]
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Rosenblatt E, Fidarova E, Utehina O, Tkachev S, Kislyakova M, Semikoz N, Sinaika V, Kim V, Karamyan N, Isayev I, Akbarov K, Lomidze D, Bondareva O, Tuzlukov P, Zardodkhonova M, Alimov J, Jones G, Barton M, Mackillop W. OC-0193: Current radiotherapy capacity in post-Soviet countries; an IAEA survey. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)40191-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Rosenblatt E, Barton M, Mackillop W, Fidarova E, Cordero L, Yarney J, Lim C, Abad A, Cernea V, Stojanovic-Rundic S, Strojan P, Kochbati L, Quarneti A. OC-0192: Optimal radiotherapy utilization rate in developing countries: an IAEA study. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)40190-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Do V, Ng W, Jacob S, Delaney G, Barton M. An Estimation of the Population-Based Survival Benefit of First-Line Chemotherapy for Lung Cancer. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv050.37] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Barton M. SP-0393: The costs and benefits of radiotherapy: using treatment fractions to estimate radiotherapy costs and effects. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)40389-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Barton M, Marecek R, Rektor I, Mikl M. 44. Dealing with noise in psychophysiological interaction analysis. Clin Neurophysiol 2015. [DOI: 10.1016/j.clinph.2014.10.203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Do V, Ng W, Delaney G, Barton M. An Estimation of the Population Survival Benefit of First-Line Chemotherapy for Gastrointestinal Cancer. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu333.107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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39
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Barton M, Mikl M, Marecek R. 33. Dealing with noise in psychophysiological interactions – fMRI analyses. Clin Neurophysiol 2014. [DOI: 10.1016/j.clinph.2013.12.071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Barton M, Morley JW, Stoodley MA, Ng KS, Piller SC, Duong H, Mawad D, Mahns DA, Lauto A. Laser-activated adhesive films for sutureless median nerve anastomosis. J Biophotonics 2013; 6:938-949. [PMID: 23712961 DOI: 10.1002/jbio.201300054] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Revised: 05/03/2013] [Accepted: 05/06/2013] [Indexed: 06/02/2023]
Abstract
A novel chitosan adhesive film that incorporates the dye 'Rose Bengal' (RB) was used in conjunction with a green laser to repair transected rat median nerves in vivo. Histology and electrophysiological recording assessed the impact of the laser-adhesive technique on nerves. One week post-operatively, the sham-control group (laser-adhesive technique applied on un-transected nerves) conserved the average number and size of myelinated fibres in comparison to its contralateral side and electrophysiological recordings demonstrated no significant difference with un-operated nerves. Twelve weeks after the laser-adhesive anastomoses, nerves were in continuity with regenerated axons that crossed the anastomotic site.
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Affiliation(s)
- Mathew Barton
- School of Medicine, University of Western Sydney, Locked Bag 1797 Penrith, NSW, 2751, Australia
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Acquaye AA, Vera-Bolanos E, Gilbert MR, Armstrong TS, Lin L, Amidei C, Lovely M, Arzbaecher J, Page M, Mogensen K, Lupica K, Maher ME, Armstrong TS, Won M, Wefel JS, Gilbert MR, Pugh S, Wendland MM, Brachman DG, Brown PD, Crocker IR, Robins HI, Lee RJ, Mehta M, Arvold N, Wang Y, Zigler C, Schrag D, Dominici F, Boele F, Douw L, de Groot M, van Thuijl H, Cleijne W, Heimans J, Taphoorn M, Reijneveld J, Klein M, Bunevicius A, Tamasauskas S, Tamasauskas A, Deltuva V, Bunevicius R, Cahill J, Lin L, Armstrong T, Acquaye A, Vera-Bolanos E, Gilbert M, Padhye N, Chan J, Clarke J, Lawton K, Rabbitt J, DeSilva A, Prados M, Rosen M, Cher L, Diamond E, Applebaum A, Corner G, DeRosa A, Breitbart W, DeAngelis L, Hoogendoorn P, Ikuta S, Muragaki Y, Maruyama T, Nitta M, Tamura M, Okamoto S, Iseki H, Okada Y, Lacouture M, Davis ME, Elzinga G, Butowski N, Tran D, Villano J, Wong E, Legge D, Cher L, Legge D, Cher L, Mills K, Lin L, Acquaye A, Vera-Bolanos E, Gilbert M, Armstrong T, Lovely M, Sullivan D, Mueller S, Fullerton H, Stratton K, Leisenring W, Armstrong G, Weathers R, Stovall M, Goldsby R, Sklar C, Robison L, Krull K, Pace A, Villani V, Focarelli S, Benincasa D, Benincasa A, Carapella CM, Pompili A, Peiffer AM, Burke A, Leyer CM, Shing E, Kearns WT, Hinson WH, Case D, Rapp SR, Shaw EG, Chan MD, Porensky E, Cavaliere R, Newton H, Shilds A, Burgess S, Ravelo A, Taylor F, Mazar I, Abrey L, Rooney A, Graham C, McKenzie H, Fraser M, MacKinnon M, McNamara S, Rampling R, Carson A, Grant R, Rooney A, Heimans L, Woltz S, Kerrigan S, McNamara S, Grant R, Seibl-Leven M, Wittenstein K, Rohn G, Goldbrunner R, Timmer M, Kennedy J, Sherman W, Sen-Gupta I, Garic I, Macken M, Gerard E, Raizer J, Schuele S, Grontoft M, Stragliotto G, Taphoorn MJ, Henriksson R, Bottomley A, Cloughesy T, Wick W, Mason W, Saran F, Nishikawa R, Ravelo A, Hilton M, Chinot OL, Trad W, Simpson T, Wright K, Tran T, Choong C, Barton M, Hovey E, Robinson K, Koh ES, Vera-Bolanos E, Acquaye AA, Brown PD, Chung C, Gilbert MR, Vardy J, Armstrong TS, Walbert T, Mendoza T, Vera-Bolanos E, Gilbert M, Acquaye A, Armstrong T, Walbert T, Glantz M, Schultz L, Puduvalli VK, Oudenhoven M, Farin C, Hoffman R, Armstrong T, Ewend M, Wu J. SYMPTOM MANAGEMENT/QUALITY OF LIFE. Neuro Oncol 2013; 15:iii226-iii234. [PMCID: PMC3823907 DOI: 10.1093/neuonc/not192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2024] Open
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Trotman H, Lord C, Barton M, Antoine M. Hypernatraemic dehydration in Jamaican breastfed neonates: a 12-year review in a baby-friendly hospital. ACTA ACUST UNITED AC 2013; 24:295-300. [PMID: 15720886 DOI: 10.1179/027249304225019118] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
A 12-year retrospective review of neonates admitted with hypernatraemic dehydration to the neonatal unit of the University Hospital of the West Indies was conducted between 1 January 1990 and 31 December 2001. Twenty-four infants fulfilled the criteria for hypernatraemic dehydration. Nineteen (79%) women were either nulliparous or primiparous with a mean (SD) age of 26.9 (4.4) yrs. Modal length of hospital stay for mothers was 24 hrs. Twenty (83.3%) infants were exclusively breastfed. Mean (SD) age at presentation was 7.4 (3.8) days. Mean (SD) percentage weight loss between birth and presentation was 18.9% (6.3). Mean (SD) serum sodium at presentation was 164.8 (13.9) mmol/L. Babies visited at home by nurses had a lower mean serum sodium, were less dehydrated and were significantly less acidiotic. Their mean (SD) length of hospital stay was also significantly less [4.2 (1.4) days] than those who were not visited [7.9 (3.8) days] (p < 0.05). Complications occurred in 19 (79%) of infants and included renal failure (19, 79%), seizures (3, 13%) and intraventricular haemorrhage (1, 4%), and one died (4%). Hypernatraemic dehydration is an uncommon complication of failure to establish breastfeeding but is associated with severe morbidity and mortality. Education programmes are needed to increase awareness amongst health-care workers and mothers in order to prevent the problem.
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Affiliation(s)
- H Trotman
- Section of Child Health, Department of Obstetrics, Gynaecology and Child Health, University of the West Indies, Mona, Kingston, Jamaica.
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Abstract
A 5-year retrospective review of cases of invasive pneumococcal disease admitted to the Bustamante Hospital for Children, Jamaica was conducted. A total of 111 cases were identified. The estimated incidence of invasive pneumococcal disease in Kingston and St Andrew was 21/100,000 children under the age of 10 years. The majority of cases (76%) were in the under-2-years age group. All four deaths were of infants. Pre-existing medical conditions included sickle cell disease, HIV and undernutrition. The rate of resistance to penicillin was 13.8%. Meningitis accounted for three of the four deaths identified and poor outcome was identified in 28% of cases of meningitis. We conclude that invasive pneumococcal disease causes significant morbidity and mortality in young Jamaican children. Strategies directed at preventing HIV infection and malnutrition and improving the care of children with sickle cell disease and HIV infection would significantly reduce disease incidence.
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Affiliation(s)
- D McGregor
- Bustamante Hospital for Children, Kingston, Jamaica
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Metcalfe P, Liney GP, Holloway L, Walker A, Barton M, Delaney GP, Vinod S, Tome W. The potential for an enhanced role for MRI in radiation-therapy treatment planning. Technol Cancer Res Treat 2013; 12:429-46. [PMID: 23617289 PMCID: PMC4527434 DOI: 10.7785/tcrt.2012.500342] [Citation(s) in RCA: 136] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The exquisite soft-tissue contrast of magnetic resonance imaging (MRI) has meant that the technique is having an increasing role in contouring the gross tumor volume (GTV) and organs at risk (OAR) in radiation therapy treatment planning systems (TPS). MRI-planning scans from diagnostic MRI scanners are currently incorporated into the planning process by being registered to CT data. The soft-tissue data from the MRI provides target outline guidance and the CT provides a solid geometric and electron density map for accurate dose calculation on the TPS computer. There is increasing interest in MRI machine placement in radiotherapy clinics as an adjunct to CT simulators. Most vendors now offer 70 cm bores with flat couch inserts and specialised RF coil designs. We would refer to these devices as MR-simulators. There is also research into the future application of MR-simulators independent of CT and as in-room image-guidance devices. It is within the background of this increased interest in the utility of MRI in radiotherapy treatment planning that this paper is couched. The paper outlines publications that deal with standard MRI sequences used in current clinical practice. It then discusses the potential for using processed functional diffusion maps (fDM) derived from diffusion weighted image sequences in tracking tumor activity and tumor recurrence. Next, this paper reviews publications that describe the use of MRI in patient-management applications that may, in turn, be relevant to radiotherapy treatment planning. The review briefly discusses the concepts behind functional techniques such as dynamic contrast enhanced (DCE), diffusion-weighted (DW) MRI sequences and magnetic resonance spectroscopic imaging (MRSI). Significant applications of MR are discussed in terms of the following treatment sites: brain, head and neck, breast, lung, prostate and cervix. While not yet routine, the use of apparent diffusion coefficient (ADC) map analysis indicates an exciting future application for functional MRI. Although DW-MRI has not yet been routinely used in boost adaptive techniques, it is being assessed in cohort studies for sub-volume boosting in prostate tumors.
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Affiliation(s)
- P Metcalfe
- Centre for Medical Radiation Physics, University of Wollongong, NSW, Australia.
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Gabriel G, Barton M, Delaney G. PD-0370: Radiotherapy utilisation in NSW and ACT [2004-06], a data linkage and GIS experience. Radiother Oncol 2013. [DOI: 10.1016/s0167-8140(15)32676-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Barton M, Piller SC, Mahns DA, Morley JW, Mawad D, Longo L, Lauto A. In vitro cell compatibility study of rose bengal-chitosan adhesives. Lasers Surg Med 2012; 44:762-8. [DOI: 10.1002/lsm.22076] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/14/2012] [Indexed: 01/01/2023]
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Abstract
BACKGROUND Although Thrombolysis has been licensed in the UK since 2003, it is still administered only to a small percentage of eligible patients. AIM We consider the impact of investing the impact of thrombolysis on important acute stroke services, and the effect on quality of life. The concept is illustrated using data from the Northern Ireland Stroke Service. DESIGN Retrospective study. METHODS We first present results of survival analysis utilizing length of stay (LOS) for discharge destinations, based on data from the Belfast City Hospital (BCH). None of these patients actually received thrombolysis but from those who would have been eligible, we created two initial groups, the first representing a scenario where they received thrombolysis and the second comprising those who do not receive thrombolysis. On the basis of the survival analysis, we created several subgroups based on discharge destination. We then developed a discrete event simulation (DES) model, where each group is a patient pathway within the simulation. Coxian phase type distributions were used to model the group LOS. Various scenarios were explored focusing on cost-effectiveness across hospital, community and social services had thrombolysis been administered to these patients, and the possible improvement in quality of life, should the proportion of patients who are administered thrombolysis be increased. Our aim in simulating various scenarios for this historical group of patients is to assess what the cost-effectiveness of thrombolysis would have been under different scenarios; from this we can infer the likely cost-effectiveness of future policies. RESULTS The cost of thrombolysis is offset by reduction in hospital, community rehabilitation and institutional care costs, with a corresponding improvement in quality of life. CONCLUSION Our model suggests that provision of thrombolysis would produce moderate overall improvement to the service assuming current levels of funding.
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Affiliation(s)
- M Barton
- School of Computing and Information Engineering, University of Ulster, Cromore Road, Coleraine, NI, BT52 1SA, UK
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Obeng AS, Rickard H, Sexton M, Pang Y, Peng H, Barton M. Antimicrobial susceptibilities and resistance genes in Campylobacter strains isolated from poultry and pigs in Australia. J Appl Microbiol 2012; 113:294-307. [PMID: 22672511 DOI: 10.1111/j.1365-2672.2012.05354.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Revised: 04/28/2012] [Accepted: 05/24/2012] [Indexed: 02/01/2023]
Abstract
AIMS To evaluate the phenotypic and genotypic profiles of Campylobacter spp. from poultry faecal samples from free range or intensively raised meat chickens and free range egg layers. In addition, a case-comparison study of antibiotic resistance genes from different groups of poultry and some pig strains previously collected was carried out. METHODS Resistance to different antibiotics was assessed using the agar dilution method. In addition, all the strains were tested for ampicillin (bla(OXA-61) ), erythromycin (aph-3-1), tetracycline tet(O), streptomycin (aadE), and the energy-dependent multi-drug efflux pump (cmeB) resistance genes using multiplex polymerase chain reaction. RESULTS The evaluation of phenotypic resistance revealed all of the strains from poultry were sensitive to ciprofloxacin, gentamicin, erythromycin or tylosin. But, widespread resistance to lincomycin (51-100%), extensive resistance to ampicillin (33·3-60·2%) and less resistance to tetracycline (5·6-40·7%) were observed in the different groups of chickens. Antibiotic resistance genes bla(OXA-61,) cmeB and tet(O) were found in 82·6-92·7%, 80·3-89% and 22·3-30·9% Camp. coli isolates from pigs, whilst 59-65·4% and 19·2-40·7% Camp. jejuni from chickens were found to encode bla(OXA-61) and tet(O), respectively. CONCLUSION No significant difference between isolates from free range egg layers and meat chickens (P < 0·05) was found. However, there were significant differences between the pig strains and all the groups of poultry strains (P < 0·05) with regard to carriage of resistance genes. In addition, pulsed field gel electrophoresis of selected resistant isolates from the poultry and pig revealed closely related clonal groups. SIGNIFICANCE AND IMPACT OF THE STUDY Our results suggest the resistant strains are persisting environmental isolates that have been acquired by the different livestock species. Furthermore, the different treatment practices in poultry and pigs have resulted in differences in resistance profiles in Campylobacter isolates.
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Affiliation(s)
- A S Obeng
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, SA, Australia
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Chapman M, Fraser R, Nguyen N, Deane A, Vasist LS, Hacquoil K, Barton M, Dukes GE. Gastric emptying assessment in critically ill patients with feed intolerance; comparison of 13C octanoic acid, paracetamol and 3-O-methylglucose absorption tests. Crit Care 2012. [PMCID: PMC3363580 DOI: 10.1186/cc10769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
| | - R Fraser
- University of Adelaide, Australia
| | - N Nguyen
- University of Adelaide, Australia
| | - A Deane
- University of Adelaide, Australia
| | - LS Vasist
- GlaxoSmithKline, Research Triangle Park, NC, USA
| | - K Hacquoil
- GlaxoSmithKline, Research Triangle Park, NC, USA
| | - M Barton
- GlaxoSmithKline, Research Triangle Park, NC, USA
| | - GE Dukes
- GlaxoSmithKline, Research Triangle Park, NC, USA
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Abstract
Obesity increases the risk of coronary artery disease through insulin resistance, diabetes, arterial hypertension and dyslipidemia. The prevalence of obesity has increased worldwide and is particularly high among middle-aged women and men. After menopause, women are at an increased risk to develop visceral obesity due to the loss of endogenous ovarian hormone production. Effects of oestrogens are classically mediated by the two nuclear oestrogen receptors (ERs) α and β. In addition, more recent research has shown that the intracellular transmembrane G-protein-coupled oestrogen receptor (GPER) originally designated as GPR30 also mediates some of the actions attributed to oestrogens. Oestrogen and its receptors are important regulators of body weight and insulin sensitivity not only in women but also in men as demonstrated by ER mutations in rodents and humans. This article reviews the role of sex hormones and ERs in the context of obesity, insulin sensitivity and diabetes as well as the related clinical issues in women and men.
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Affiliation(s)
- M R Meyer
- Molecular Internal Medicine, University of Zurich, Switzerland
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