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Hsieh K, Bloom JR, Jones B, Hsieh C, Salgado LR, Rowley JP, Sindhu K. Academic U.S. Radiation Oncology Department Chairs: Who are They? Int J Radiat Oncol Biol Phys 2023; 117:e518-e519. [PMID: 37785616 DOI: 10.1016/j.ijrobp.2023.06.1784] [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] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) Historically, there has been a gender imbalance in the composition of the academic radiation oncology (RO) workforce. Given the increasing diversity of patients treated by academic radiation oncologists across the US, sufficient representation of women in academic RO, especially in leadership, is of paramount importance. In this study, we sought to better understand the characteristics of individuals currently serving as academic RO chairpersons whose departments are affiliated with ACGME-accredited RO residency training programs. MATERIALS/METHODS We created a comprehensive database of academic RO chairpersons in the US by utilizing information from publicly available sources, including residency training program websites, hospital/institutional websites, Doximity, LinkedIn, the American Society of Radiation Oncology (ASTRO) website, the American College of Radiation Oncology (ACRO) website, and the National Plan and Provider Enumeration System National Provider Identifier Registry. We used the Mann-Whitney U test and two-proportion z tests to evaluate for statistical significance among medians and proportions, respectively. RESULTS We identified 85/90 chairpersons (94.4%) whose departments are affiliated with an ACGME-accredited RO residency program. 4/85 (4.7%) chairpersons hold interim positions and were excluded from further analyses. Of the remaining 81 chairpersons in permanent positions, 10 (12.3%) are females and 71 (87.7%) are males (p < 0.01). 77 (95.1%) chairpersons are full professors and 19 (23.5%) hold dual MD-PhD degrees. 33 (40.7%) chairpersons hold an official leadership role, such as "director" or "chair," in the cancer institution affiliated with their institution; while such titles are more common among male than female chairpersons, the difference is not statistically significant (43.7% vs 20%, p = 0.15). 74/81 chairpersons secured their current positions a median of 16 years (range 6-33 years) after completing RO residency, with no statistically significant difference between male and female chairpersons (median 16 vs 18 years, respectively; p = 0.38). 36 (44.4%) chairpersons were promoted to chair from another position at their respective institutions (men 70.0% vs females 40.8%, p = 0.08). The majority of chairpersons are ASTRO Fellows (61.7%); notably fewer are ASTRO (3.7%) or ACRO (2.5%) Gold Medalists. There are no statistical differences among male and female chairpersons in the proportion who have received an ASTRO Fellow designation (60.6% vs 70.0%, p = 0.57) or ASTRO (4.2% vs 0.0%, p = 0.51) or ACRO (2.8% vs 0.0%, p = 0.59) Gold Medal. CONCLUSION In our benchmark study of the characteristics of current academic US RO chairpersons, we found that significantly more men than women currently serve as RO chairpersons. Future interventions that promote the recruitment, retention, and promotion of talented female academic RO physicians through the academic pipeline are warranted.
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Affiliation(s)
- K Hsieh
- Department of Radiation Oncology, Icahn School of Medicine at Mount Sinai, New York, NY
| | - J R Bloom
- Department of Radiation Oncology, Icahn School of Medicine at Mount Sinai, New York, NY
| | - B Jones
- Department of Radiation Oncology, Icahn School of Medicine at Mount Sinai, New York, NY
| | - C Hsieh
- Department of Diagnostic Imaging, Warren Alpert Medical School of Brown University, Providence, RI
| | - L Resende Salgado
- Department of Radiation Oncology, Icahn School of Medicine at Mount Sinai, New York, NY
| | - J P Rowley
- Department of Radiation Oncology, Maimonides Cancer Center, Brooklyn, NY
| | - K Sindhu
- Department of Radiation Oncology, Icahn School of Medicine at Mount Sinai, New York, NY
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Hsieh C, Ward R, Oueidat K, Baird G, Ahn S. Abstract No. 262 Recurrence of breast cancer post-cryoablation in candidates previously excluded from clinical trials. J Vasc Interv Radiol 2022. [DOI: 10.1016/j.jvir.2022.03.343] [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: 10/18/2022] Open
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Wang F, Trier A, Li F, Kim S, Chen Z, Chai J, Mack M, Morrison S, Hamilton J, Baek J, Yang T, Heul AMV, Xu A, Xie Z, Dong X, Kubo M, Hu H, Hsieh C, Dong X, Liu Q, Margolis D, Ardeleanu M, Miller M, Kim B. 201 A basophil-neuronal axis promotes itch. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.02.222] [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: 11/24/2022]
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DE Winter DAM, Hsieh C, Marko M, Hayles MF. Cryo-FIB preparation of whole cells and tissue for cryo-TEM: use of high-pressure frozen specimens in tubes and planchets. J Microsc 2020; 281:125-137. [PMID: 32691851 PMCID: PMC7891314 DOI: 10.1111/jmi.12943] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [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] [Received: 05/01/2020] [Revised: 05/27/2020] [Accepted: 07/13/2020] [Indexed: 01/15/2023]
Abstract
The desire to study macromolecular complexes within their cellular context requires the ability to produce thin samples suitable for cryo‐TEM (cryo‐transmission electron microscope) investigations. In this paper, we discuss two similar approaches, which were developed independently in Utrecht (the Netherlands) and Albany (USA). The methods are particularly suitable for both tissue samples and cell suspensions prepared by a high‐pressure freezer (HPF). The workflows are explained with particular attention to potential pitfalls, while underlying principles are highlighted (‘why to do so’). Although both workflows function with a high success rate, full execution requires considerable experience and remains demanding. In addition, throughput is low. We hope to encourage other research groups worldwide to take on the challenge of improving the HPF– cryo‐FIB‐SEM – cryo‐TEM workflow. We discuss a number of suggestions to this end. Lay Description Life is ultimately dictated by the interaction of molecules in our bodies. Highly complex equipment is being used and further developed to study these interactions. The present paper describes methods to prepare small, very thin lamellae (area of 5×5 µm2, thickness 50–300 nm) of a cell to be studied in a cryo‐transmission electron microscope (cryo‐TEM). Special care must be taken to preserve the natural state of molecules in their natural environment. In the case of cryo‐TEM, the samples must be frozen and kept frozen to be compatible with the vacuum conditions in the microscope. The frozen condition imposes technical challenges which are addressed. Two approaches to obtain the thin lamellae are described. Both make use of a focused ion beam (FIB) microscope. The FIB allows removal of material with nanometre precision by focusing a beam of ionised atoms (gallium ions) onto the sample. Careful control of the FIB allows cutting out of the required thin lamellae. In both strategies, the thin lamellae remain attached to the original sample, and the ensemble of sample with section and sample holder is transported from the FIB microscope to the TEM while being kept frozen.
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Affiliation(s)
- D A M DE Winter
- Environmental Hydrogeology, Department of Earth Sciences, Utrecht University, Princetonlaan 8a, Utrecht, the Netherlands
| | - C Hsieh
- New York State Department of Health, Wadsworth Center, Empire State Plaza, Albany, New York, U.S.A
| | - M Marko
- New York State Department of Health, Wadsworth Center, Empire State Plaza, Albany, New York, U.S.A.,College of Nanoscale Science and Engineering, SUNY Polytechnic Institute, Albany, New York, U.S.A
| | - M F Hayles
- Cryo-FIB-SEM Technologist, Eindhoven, the Netherlands
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Venkatesulu BP, Chandrasekar VT, Girdhar P, Advani P, Sharma A, Elumalai T, Hsieh C, Elghazawy HI, Verma V, Krishnan S. A systematic review and meta-analysis of cancer patients affected by a novel coronavirus. medRxiv 2020:2020.05.27.20115303. [PMID: 32511470 PMCID: PMC7265691 DOI: 10.1101/2020.05.27.20115303] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Cancer patients with COVID-19 disease have been reported to have double the case fatality rate of the general population. MATERIALS AND METHODS A systematic search of PubMed/MEDLINE, Embase, Cochrane Central, Google Scholar, and MedRxiv was done for studies on cancer patients with COVID-19. Pooled proportions were calculated for categorical variables. Odds ratio and forest plots were constructed for both primary and secondary outcomes. The random-effects model was used to account for heterogeneity between studies. RESULTS This systematic review of 31 studies and meta-analysis of 181,323 patients from 26 studies involving 23,736 cancer patients is the largest meta-analysis to the best of our knowledge assessing outcomes in cancer patients affected by COVID-19. Our meta-analysis shows that cancer patients with COVID-19 have a higher likelihood of death (odds ratio, OR 2.54), which was largely driven by mortality among patients in China. Cancer patients were more likely to be intubated, although ICU admission rates were not statistically significant. Among cancer subtypes, the mortality was highest in hematological malignancies (OR 2.43) followed by lung cancer (OR 1.8). There was no association between receipt of a particular type of oncologic therapy and mortality. Our study showed that cancer patients affected by COVID-19 are a decade older than the normal population and have a higher proportion of co-morbidities. There was insufficient data to assess the association of COVID-directed therapy and survival outcomes in cancer patients. Despite the heterogeneity of studies and inconsistencies in reported variables and outcomes, these data could guide clinical practice and oncologic care during this unprecedented global health pandemic. CONCLUSION Cancer patients with COVID-19 disease are at increased risk of mortality and morbidity. A more nuanced understanding of the interaction between cancer-directed therapies and COVID-19-directed therapies is needed. This will require uniform prospective recording of data, possibly in multi-institutional registry databases.
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Affiliation(s)
- B P Venkatesulu
- Transitional year residency, Department of Internal Medicine, Henry Ford Hospital, Detroit, MI 48202, United States
| | - V T Chandrasekar
- Department of Gastroenterology and Hepatology, University of Kansas Medical Center, Kansas City, KS 66160, United States
| | - P Girdhar
- Department of Radiation Oncology, All India Institute of Medical Sciences, New Delhi, India
| | - P Advani
- Radiation Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Institutes of Health, National Cancer Institute, Bethesda, MD 20892, United States
| | - A Sharma
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, United States
| | - T Elumalai
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - C Hsieh
- Department of Radiation Oncology, Institute for Radiological Research, Chang Gung Memorial Hospital at Linkou and Chang Gung University, Taoyuan City, Taiwan
- Graduate School of Biomedical Sciences, The University of Texas Health Science Center at Houston and The University of Texas MD Anderson Cancer Center, Houston, TX 77030, United States
| | - H I Elghazawy
- Department of Clinical Oncology, Faculty of Medicine, Ain Shams University, Abbaseya, Cairo, Egypt
| | - V Verma
- Department of Radiation Oncology, Allegheny General Hospital, Pittsburgh, Pennsylvania
| | - S Krishnan
- Department of Radiation Oncology, Mayo Clinic Florida, 4500 San Pablo Road S, Mayo 1N, Jacksonville, FL 32224, USA
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Shen C, Hsieh C, Kuo T, Cho C. Fructose substitution enhances derivation and self-renewal expansion of induced pluripotent stem cells. Cytotherapy 2020. [DOI: 10.1016/j.jcyt.2020.03.050] [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: 11/15/2022]
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Pearlman AS, Narang A, Hong H, Hsieh C, Chaudhry A, Chen C, Guttas S, Surette S, Parajuli N, Polivert N, Cadieu C, Martin RP, Thomas JD, Weissman NJ. 547 Point-of-care cardiac assessment using machine learning to guide image acquisition. Eur Heart J Cardiovasc Imaging 2020. [DOI: 10.1093/ehjci/jez319.281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 11/14/2022] Open
Abstract
Abstract
Funding Acknowledgements
Bay Labs, Inc; San Francisco, CA
Background/Introduction: When used by experienced examiners, the utility of point-of-care (POC) ultrasound for assessing cardiac anatomy and function has been well established. However, in some clinical circumstances (Primary Care offices, Intensive Care Unit, some Emergency Rooms, or in remote settings) in which a rapid assessment of cardiac anatomy and dynamics can facilitate patient care, an examiner experienced at POC scanning may not be immediately available.
Purpose
To help novice users acquire clinically useful standard cardiac views using novel machine learning (ML) software.
Methods
We used an investigational device that employs ML software to provide real-time adaptive guidance of transducer position and orientation to help novice users acquire tomographic views of the heart. We tested the utility of this approach when 4 nurses with no prior training in sonography performed POC studies on 16 subjects (10 healthy, 6 with cardiac abnormalities; 9 men; body mass index normal in 6, overweight in 6, and obese in 4 subjects). Each nurse underwent didactic training and 4 hours of supervised practice using the ML program. Each nurse scanned each study subject using a scanner equipped with ML software to acquire 10 digital two-dimensional image clips, including: parasternal long axis, short axis at the aortic valve, mitral valve, and mid-left ventricle (LV), apical 2-, 4-, and 5-chamber, subcostal 4-chamber, and longitudinal views of the inferior vena cava (IVC). All video clips (n = 640) were later reviewed independently by 5 level 3-trained cardiologists who were blinded to subject, scanner, and each other"s assessments. The expert readers reviewed each set of 10 clips to determine if the following variables could be assessed qualitatively: LV size and function; right ventricular (RV) size and function; aortic, mitral and tricuspid valves; pericardial effusion; left atrial size; IVC size.
Results
The majority of expert readers concurred, independently, that the sets of images acquired by nurses using ML guidance allowed qualitative assessment of LV size and function in 98%, pericardial effusion in 98%, RV size and function in 92%, and aortic and mitral valve anatomy and dynamics in 94-97% of cases. Qualitative assessment of LA size was feasible in 95%. Images of the IVC were judged as adequate for assessment in 58%.
Conclusion
This preliminary study suggests the potential value of novel ML software by demonstrating that nurses with limited training can acquire tomographic images useful for qualitative assessment of the cardiac chambers and valves in more than 90% of the subjects examined. This approach might be useful when timely POC cardiac assessment is indicated in settings where an experienced examiner is not available. Further refinements in the guiding software are needed to improve the success rate of IVC imaging, since IVC size can be a useful indicator of volume status.
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Affiliation(s)
- A S Pearlman
- University of Washington, Seattle, United States of America
| | - A Narang
- Northwestern University, Chicago, United States of America
| | - H Hong
- Bay Labs, Inc, San Francisco, United States of America
| | - C Hsieh
- Bay Labs, Inc, San Francisco, United States of America
| | - A Chaudhry
- Bay Labs, Inc, San Francisco, United States of America
| | - C Chen
- Bay Labs, Inc, San Francisco, United States of America
| | - S Guttas
- Bay Labs, Inc, San Francisco, United States of America
| | - S Surette
- Bay Labs, Inc, San Francisco, United States of America
| | - N Parajuli
- Bay Labs, Inc, San Francisco, United States of America
| | - N Polivert
- Bay Labs, Inc, San Francisco, United States of America
| | - C Cadieu
- Bay Labs, Inc, San Francisco, United States of America
| | - R P Martin
- Bay Labs, Inc, San Francisco, United States of America
| | - J D Thomas
- Northwestern University, Chicago, United States of America
| | - N J Weissman
- Medstar Research Institute, Washington, DC, United States of America
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8
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Kaspar B, Thomsen G, Hsieh C, Do J, Solano S, Chu B, Barkho B, Fugere M, Kaufmann P, Foust K, Kaspar A, L'Italien J, Sproule D, Feltner D, Chung W, Burghes A, McGovern V, Hevner R, Conces M, Mendell J. O.24Biodistribution of onasemnogene abeparvovec (AVXS-101) DNA, mRNA, and SMN protein in human tissue. Neuromuscul Disord 2019. [DOI: 10.1016/j.nmd.2019.06.307] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Mannella CA, Liu Z, Hsieh C, Afzal N, Adams RA, Jafri MS, Lederer WJ. How the Nanoarchitecture of Cardiac Muscle Mitochondria Affects Function: Lessons from Computer Simulations. Biophys J 2019. [DOI: 10.1016/j.bpj.2018.11.860] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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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10
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Hsieh C, Hung S, Chen K. 182 Effectiveness of Treatments and Diagnostic Tools and Declining Mortality in Patients With Severe Sepsis: A 12-Year Population-Based Cohort Study. Ann Emerg Med 2018. [DOI: 10.1016/j.annemergmed.2018.08.187] [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: 10/28/2022]
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11
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Hung S, Hsieh C, Chen K. 139 Predicting Influenza Infection by Clinical Feature-Based Machine Learning Algorithms. Ann Emerg Med 2018. [DOI: 10.1016/j.annemergmed.2018.08.144] [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: 10/28/2022]
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12
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Mesia Nin R, Bossi P, Hansen A, Hsieh C, Licitra L, Tan E, Chen P, Miller J, Siu L, Haddad R. Phase II study of CC-486 in previously treated patients (pts) with locally advanced/metastatic nasopharyngeal cancer (NPC): Final results. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy287.027] [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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Eather S, Ekmejian A, Lim R, Zaky F, Owensby D, Yeung A, Shetty P, Sepahpour A, Hsieh C, Lee A. Atrial Fibrillation: A Descriptive Study of Management in a Large Cardiology Practice. Heart Lung Circ 2018. [DOI: 10.1016/j.hlc.2018.06.241] [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: 10/28/2022]
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14
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Liu C, Hsu P, Chien H, Hsieh C. OA 04.07 Initial Results of Tubeless Single-Port Thoracoscopic Surgery for Pulmonary Tumor. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.345] [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: 10/18/2022]
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15
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Lin P, Hsieh C, Wei Y, Hsu Y, Huang Y. THE EFFECT OF KINECT-BASED TAI-CHI EXERGAMING PROGRAM ON OLDER ADULTS WITH MILD DEMENTIA. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.353] [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: 11/12/2022] Open
Affiliation(s)
- P. Lin
- Department of Physical Therapy & Graduate Institute of Rehabilitation Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan,
- Healthy Aging Research Center, Chang Gung University, Taoyuan, Taiwan,
- Dept of Internal & Geriatric Medicine, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan, Taiwan
| | - C. Hsieh
- Department of Physical Therapy & Graduate Institute of Rehabilitation Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan,
| | - Y. Wei
- Department of Physical Therapy & Graduate Institute of Rehabilitation Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan,
| | - Y. Hsu
- Department of Physical Therapy & Graduate Institute of Rehabilitation Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan,
| | - Y. Huang
- Department of Physical Therapy & Graduate Institute of Rehabilitation Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan,
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16
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Chiu H, Su T, Chen C, Chen C, Hsieh C, Liu C. DEMENTIA PREDICTED ONE-YEAR MORTALITY FOR HIP FRACTURE PATIENTS: A POPULATION-BASED STUDY. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.3268] [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)
- H. Chiu
- Christian Changhua Hospital, Changhua, Taiwan,
- Kaohsiung Medical University, Kaohsiung, Taiwan,
| | - T. Su
- Kaohsiung Medical University, Kaohsiung, Taiwan,
| | - C. Chen
- Kaohsiung Medical University, Kaohsiung, Taiwan,
- Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung, Taiwan
| | - C. Chen
- Christian Changhua Hospital, Changhua, Taiwan,
| | - C. Hsieh
- Christian Changhua Hospital, Changhua, Taiwan,
| | - C. Liu
- Christian Changhua Hospital, Changhua, Taiwan,
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17
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Peng H, Hsieh C. THE ASSOCIATION BETWEEN FRAILTY AND SLEEP QUALITY IN OLDER ADULTS LIVING IN SELF-PAID CARE HOMES. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.4140] [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: 11/14/2022] Open
Affiliation(s)
- H. Peng
- National Taipei University of Nursing and Health Science, Taipei, Taiwan
| | - C. Hsieh
- National Taipei University of Nursing and Health Science, Taipei, Taiwan
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18
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Yeh S, Yang K, Lin L, Lee M, Hsieh C, Lin C. AGING-DEPENDENT CG HYPERMETHYLATION D GENE EXPRESSION OF GSTM1 INVOLVED IN T CELL DIFFERENTIATION. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1639] [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)
- S. Yeh
- Institute of Long-Term Care, Mackay Medical College, New Taipei City, Taiwan,
| | - K. Yang
- Institute of Long-Term Care, Mackay Medical College, New Taipei City, Taiwan,
- Institute of Biomedical Science, Mackay Medical College, New Taipei City, Taiwan,
- Department of Medical Research, Department of Pediatrics, Mackay Memorial Hospital, Taipei, Taiwan,
| | - L. Lin
- Department of Nursing, HungKuang University, Taipei, Taiwan,
| | - M. Lee
- Department of Medical Research and Development, Show Chwan Memorial Hospital, Changhua, Taiwan,
| | - C. Hsieh
- Department of Medical Research, Mackay Memorial Hospital, New Taipei City, New Taipei City, Taiwan
| | - C. Lin
- Department of Medical Research, Mackay Memorial Hospital, New Taipei City, New Taipei City, Taiwan
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He J, Hsieh C, Wu Y, Schmelzer T, Wang P, Lin Y, Marko M, Sui H. Cryo-FIB specimen preparation for use in a cartridge-type cryo-TEM. J Struct Biol 2017; 199:114-119. [PMID: 28559166 DOI: 10.1016/j.jsb.2017.05.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 02/18/2017] [Revised: 05/23/2017] [Accepted: 05/26/2017] [Indexed: 10/19/2022]
Abstract
Cryo-electron tomography (cryo-ET) is a well-established technique for studying 3D structural details of subcellular macromolecular complexes and organelles in their nearly native context in the cell. A primary limitation of the application of cryo-ET is the accessible specimen thickness, which is less than the diameters of almost all eukaryotic cells. It has been shown that focused ion beam (FIB) milling can be used to prepare thin, distortion-free lamellae of frozen biological material for high-resolution cryo-ET. Commercial cryosystems are available for cryo-FIB specimen preparation, however re-engineering and additional fixtures are often essential for reliable results with a particular cryo-FIB and cryo-transmission electron microscope (cryo-TEM). Here, we describe our optimized protocol and modified instrumentation for cryo-FIB milling to produce thin lamellae and subsequent damage-free cryotransfer of the lamellae into our cartridge-type cryo-TEM.
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Affiliation(s)
- Jie He
- Wadsworth Center, New York State Department of Health, Empire State Plaza, Albany, NY 12201, USA
| | - Chyongere Hsieh
- Wadsworth Center, New York State Department of Health, Empire State Plaza, Albany, NY 12201, USA
| | - Yongping Wu
- Wadsworth Center, New York State Department of Health, Empire State Plaza, Albany, NY 12201, USA; Zhejiang Agriculture and Forestry University, Zhejiang Province, PR China
| | - Thomas Schmelzer
- TGS Technologies, 702 Little Creek Lane, Cranberry Township, PA 16066, USA
| | - Pan Wang
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou 510006, PR China
| | - Ying Lin
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou 510006, PR China
| | - Michael Marko
- Wadsworth Center, New York State Department of Health, Empire State Plaza, Albany, NY 12201, USA
| | - Haixin Sui
- Wadsworth Center, New York State Department of Health, Empire State Plaza, Albany, NY 12201, USA; Department of Biomedical Sciences, School of Public Health, University at Albany, Albany, NY 12201, USA.
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Abstract
Phase plate (PP) imaging has proven to be valuable in transmission cryo electron microscopy of unstained, native-state biological specimens. Many PP types have been described, however until the recent implementation of the "hole-free" phase plate (HFPP), imaging has been challenging. We found the HFPP to be simple to construct and to set up in the transmission electron microscopy, but care in implementing automated data collection is needed. Performance may be variable, both initially and over time, thus it is important to monitor and evaluate image quality by observing the power spectrum. We found that while some HFPPs gave transfer to high resolution without CTF oscillation, most reached high resolution when operated with modest defocus.
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Affiliation(s)
- Michael Marko
- NY State Department of Health, Wadsworth Center, PO Box 509, Albany,
NY 12201, USA
- College of Nanoscale Science and Engineering, SUNY Polytechnic
Institute, Albany, NY 12203, USA
| | - Chyongere Hsieh
- NY State Department of Health, Wadsworth Center, PO Box 509, Albany,
NY 12201, USA
| | - Eric Leith
- Department of Materials Science and Engineering, Rensselaer
Polytechnic Institute, Troy, NY 12180, USA
| | - David Mastronarde
- Department of MCD Biology, University of Colorado Boulder, Boulder,
CO 80309, USA
| | - Sohei Motoki
- JEOL USA, 11 Dearborn Road, Peabody, MA 01960, USA
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21
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Bucay N, Sekhon K, Yang T, Majid S, Shahryari V, Hsieh C, Mitsui Y, Deng G, Tabatabai ZL, Yamamura S, Calin GA, Dahiya R, Tanaka Y, Saini S. MicroRNA-383 located in frequently deleted chromosomal locus 8p22 regulates CD44 in prostate cancer. Oncogene 2016; 36:2667-2679. [PMID: 27893706 PMCID: PMC5426972 DOI: 10.1038/onc.2016.419] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [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] [Received: 03/30/2016] [Revised: 08/30/2016] [Accepted: 09/30/2016] [Indexed: 12/13/2022]
Abstract
A major genomic alteration in prostate cancer (PCa) is frequent loss of chromosome (chr) 8p with a common region of loss of heterozygosity (LOH) at chr8p22 locus. Genomic studies implicate this locus in the initiation of clinically significant PCa and with progression to metastatic disease. However, the genes within this region have not been fully characterized to date. Here we demonstrate for the first time that a microRNA component of this region –miR-383- is frequently downregulated in prostate cancer, plays a critical role in determining tumor initiating potential and is involved in prostate cancer metastasis via direct regulation of CD44, a ubiquitous marker of PCa tumor initiating cells (TICs)/ stem cells. Expression analyses of miR-383 in PCa clinical tissues established that low miR-383 expression is associated with poor prognosis. Functional data suggests that miR-383 regulates PCa tumor initiating/ stem-like cells via CD44 regulation. Ectopic expression of miR-383 inhibited tumor initiating capacity of CD44+ PCa cells. Also, ‘anti-metastatic’ effects of ectopic miR-383 expression were observed in a PCa experimental metastasis model. In view of our results, we propose that frequent loss of miR-383 at chr8p22 region leads to tumor initiation and prostate cancer metastasis. Thus, we have identified a novel finding that associates a long observed genomic alteration to PCa stemness and metastasis. Our data suggests that restoration of miR-383 expression may be an effective therapeutic modality against PCa. Importantly, we identified miR-383 as a novel PCa tissue diagnostic biomarker with a potential that outperforms that of serum PSA.
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Affiliation(s)
- N Bucay
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
| | - K Sekhon
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
| | - T Yang
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
| | - S Majid
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
| | - V Shahryari
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
| | - C Hsieh
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
| | - Y Mitsui
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
| | - G Deng
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
| | - Z L Tabatabai
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
| | - S Yamamura
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
| | - G A Calin
- Department of Experimental Therapeutics, Non-Coding RNA Center, MD Anderson Cancer Center, University of Texas, Houston, TX, USA
| | - R Dahiya
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
| | - Y Tanaka
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
| | - S Saini
- Department of Urology, Veterans Affairs Medical Center, San Francisco and University of California San Francisco, San Fransisco, CA, USA
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22
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Tan S, Chen C, Hsieh C, Chen C, Tzeng C. Higher prediction rates of endometriosis by risk factor analysis from clinical symptoms and signs. Fertil Steril 2016. [DOI: 10.1016/j.fertnstert.2016.07.800] [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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23
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Wu D, Tseng I, Yuan R, Hsieh C, Hu C. Memory consolidation and INOS expression during different sleep stages in Parkinson's disease. Sleep Med 2015. [DOI: 10.1016/j.sleep.2015.02.143] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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24
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Kishchenko GP, Danev R, Fisher R, He J, Hsieh C, Marko M, Sui H. Effect of fringe-artifact correction on sub-tomogram averaging from Zernike phase-plate cryo-TEM. J Struct Biol 2015. [PMID: 26210582 DOI: 10.1016/j.jsb.2015.07.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Zernike phase-plate (ZPP) imaging greatly increases contrast in cryo-electron microscopy, however fringe artifacts appear in the images. A computational de-fringing method has been proposed, but it has not been widely employed, perhaps because the importance of de-fringing has not been clearly demonstrated. For testing purposes, we employed Zernike phase-plate imaging in a cryo-electron tomographic study of radial-spoke complexes attached to microtubule doublets. We found that the contrast enhancement by ZPP imaging made nonlinear denoising insensitive to the filtering parameters, such that simple low-frequency band-pass filtering made the same improvement in map quality. We employed sub-tomogram averaging, which compensates for the effect of the "missing wedge" and considerably improves map quality. We found that fringes (caused by the abrupt cut-on of the central hole in the phase plate) can lead to incorrect representation of a structure that is well-known from the literature. The expected structure was restored by amplitude scaling, as proposed in the literature. Our results show that de-fringing is an important part of image-processing for cryo-electron tomography of macromolecular complexes with ZPP imaging.
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Affiliation(s)
- Gregory P Kishchenko
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, United States
| | - Radostin Danev
- Max Planck Institute of Biochemistry, Department of Molecular Structural Biology, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - Rebecca Fisher
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, United States
| | - Jie He
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, United States
| | - Chyongere Hsieh
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, United States
| | - Michael Marko
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, United States
| | - Haixin Sui
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, United States; Department of Biomedical Sciences, School of Public Health, University at Albany, Albany, NY 12201, United States.
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Hsieh C, Cheng Y, Xie H, Kokeny P, Jella P, Latif Z, Xuan Y, Haacke M. SU-D-303-06: Evaluations of Quantified Magnetic Moments From Different MRI Hardware. Med Phys 2015. [DOI: 10.1118/1.4923893] [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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26
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Wagenknecht T, Hsieh C, Marko M. Skeletal muscle triad junction ultrastructure by Focused-Ion-Beam milling of muscle and Cryo-Electron Tomography. Eur J Transl Myol 2015. [DOI: 10.4081/bam.2015.1.49] [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: 11/23/2022] Open
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Wagenknecht T, Hsieh C, Marko M. Skeletal Muscle Triad Junction Ultrastructure by Focused-Ion-Beam Milling of Muscle and Cryo-Electron Tomography. Eur J Transl Myol 2015; 25:4823. [PMID: 26913145 PMCID: PMC4748973 DOI: 10.4081/ejtm.2015.4823] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [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] [Received: 11/06/2014] [Revised: 01/09/2015] [Accepted: 01/15/2015] [Indexed: 11/23/2022] Open
Abstract
Cryo-electron tomography (cryo-ET) has emerged as perhaps the only practical technique for revealing nanometer-level three-dimensional structural details of subcellular macromolecular complexes in their native context, inside the cell. As currently practiced, the specimen should be 0.1-0.2 microns in thickness to achieve optimal resolution. Thus, application of cryo-ET to intact frozen (vitreous) tissues, such as skeletal muscle, requires that they be sectioned. Cryo-ultramicrotomy is notoriously difficult and artifact-prone when applied to frozen cells and tissue, but a new technique, focused ion beam milling (cryo-FIB), shows great promise for “thinning” frozen biological specimens. Here we describe our initial results in applying cryo-FIB and cryo-ET to triad junctions of skeletal muscle.
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Affiliation(s)
- Terence Wagenknecht
- New York State Department of Health, Wadsworth Cente, Empire State Plaza, Albany, NY, USA.,Department of Biomedical Sciences, School of Public Health, University at Albany, Albany, NY, USA
| | - Chyongere Hsieh
- New York State Department of Health, Wadsworth Cente, Empire State Plaza, Albany, NY, USA
| | - Michael Marko
- New York State Department of Health, Wadsworth Cente, Empire State Plaza, Albany, NY, USA
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Hsieh C, Chen T, Yu C, Kung K. Are Surgeon-Related Factors Contributed to Biliary Anastomosis Stricture After Liver Transplantation? Transplantation 2014. [DOI: 10.1097/00007890-201407151-02549] [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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29
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Hsieh C, Hou M, Wang L, Tai H, Tsai T, Chen Y. EP-1828: Local irradiation modulates pharmacokinetics of 5-Fluorouracil in plasma but not in lymphatic fluid. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)31946-0] [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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Hsieh C, Schmelzer T, Kishchenko G, Wagenknecht T, Marko M. Practical workflow for cryo focused-ion-beam milling of tissues and cells for cryo-TEM tomography. J Struct Biol 2013; 185:32-41. [PMID: 24211822 DOI: 10.1016/j.jsb.2013.10.019] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [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: 09/28/2013] [Revised: 10/29/2013] [Accepted: 10/31/2013] [Indexed: 11/30/2022]
Abstract
Vitreous freezing offers a way to study cells and tissue in a near-native state by cryo-transmission electron microscopy (cryo-TEM), which is important when structural information at the macromolecular level is required. Many cells - especially those in tissue - are too thick to study intact in the cryo-TEM. Cryo focused-ion-beam (cryo-FIB) milling is being used in a few laboratories to thin vitreously frozen specimens, thus avoiding the artifacts and difficulties of cryo-ultramicrotomy. However, the technique is challenging because of the need to avoid devitrification and frost accumulation during the entire process, from the initial step of freezing to the final step of loading the specimen into the cryo-TEM. We present a robust workflow that makes use of custom fixtures and devices that can be used for high-pressure-frozen bulk tissue samples as well as for samples frozen on TEM grids.
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Affiliation(s)
- Chyongere Hsieh
- New York State Department of Health, Wadsworth Center, Empire State Plaza, Albany, NY 12201, USA
| | - Thomas Schmelzer
- TGS Technologies, 702 Little Creek Lane, Cranberry Township, PA 16066, USA
| | - Gregory Kishchenko
- New York State Department of Health, Wadsworth Center, Empire State Plaza, Albany, NY 12201, USA
| | - Terence Wagenknecht
- New York State Department of Health, Wadsworth Center, Empire State Plaza, Albany, NY 12201, USA; Department of Biomedical Sciences, School of Public Health, University at Albany, Albany, NY 12203, USA
| | - Michael Marko
- New York State Department of Health, Wadsworth Center, Empire State Plaza, Albany, NY 12201, USA; College of Nanoscale Science and Engineering, University at Albany, 251 Fuller Rd., Albany, NY 12203, USA.
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31
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Hsu P, Huang C, Hsieh C, Wu Y, Hsu W. 302 * THE ROLE OF SUPERIOR MEDIASTINAL LYMPH NODE METASTASIS IN OESOPHAGEAL SQUAMOUS CELL CARCINOMA. Interact Cardiovasc Thorac Surg 2013. [DOI: 10.1093/icvts/ivt372.302] [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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32
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Wu S, Lin H, Huang W, Tung C, Liao H, Wang S, Lin Y, Hsieh C. Irradiation-induced NFκB-dependent Vimentin Expression Is Related to the Evading Radiation-induced Apoptosis in Betel Quid Chewing-related Oral Squamous Cell Carcinoma Cells. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.1222] [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: 10/27/2022]
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33
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Hsieh C, Stafford R, Reeve D. WE-G-217A-09: Phase Imaging Measurement of Static Magnetic Field Homogeneity. Med Phys 2012; 39:3977. [PMID: 28519656 DOI: 10.1118/1.4736228] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE The ACR MRI accreditation program requires measurement of the magnetic field homogeneity (MFH) in the annual QA. Full implementation of vendor methods can be very time consuming and incorporates techniques not available to clinical physicists. Conversely, many of the less involved techniques proposed tend to be less inaccurate and/or precise. Here, we propose a robust approach to MFH analysis using a simple phase mapping acquisition which is a time efficient compromise. METHODS The root mean square (r.m.s.) for MFH measurement is commonly used over multiple slices (∼24). In regions with high SNR, the MR signal can be reasonably assumed Gaussian distributed. Therefore, the standard deviation of phase values in ROI is equivalent to the r.m.s. of those. The standard deviations of phases in x, y and z are assumed uncorrelated. Thus, only axial, sagittal and coronal planes need to be acquired to approximate the MFH as opposed to a full 3D acquisition. To investigate this concept, phase images were acquired on four 1.5T clinical scanners and one 3.0 clinical scanner (MAGNETOM Espree, Siemens Medical Systems, Signa Excite HD 1.5T, and 3.0T GE Healthcare Technologies). The manufacturer phantoms were scanned using two echo times (delta_TE=TE2-TE1<5ms) using a simple 2D gradient echo acquisition to produce phase images. After acquiring phase difference images in three orthogonal planes, the standard deviation was calculated in three circular ROIs (Diameter=10, 20 and 30cm) in each plane, respectively, to estimate the MFH for the effective DSV. RESULTS The MFH values in five scanners using this method were within vendor specifications for the DSV. Additionally, the measured MFH values compared favorably with vendor planned maintenance records with <0.1 ppm discrepancy. CONCLUSIONS This proposed method may be a reliable and practical for regular MFH measurement in QA programs and providing an independent check of the vendor measurement.
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Affiliation(s)
- C Hsieh
- UT MD Anderson Cancer Center, Houston, TX
| | - R Stafford
- UT MD Anderson Cancer Center, Houston, TX
| | - D Reeve
- UT MD Anderson Cancer Center, Houston, TX
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34
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Hsieh C, Huang K, Lu J, Barry M, Kovoor P. A Novel Technique of Multi-point Pacing in Substrate Evaluation Using Conduction Velocity with Non-contact Mapping. Heart Lung Circ 2012. [DOI: 10.1016/j.hlc.2012.05.274] [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: 11/28/2022]
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35
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Hsieh C, Hoffmann T, Gustafsson L, Lee Y. The diverse constructs use of activities of daily living measures in stroke randomized controlled trials in the years 2005–2009. J Rehabil Med 2012; 44:720-6. [DOI: 10.2340/16501977-1008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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36
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Hsieh C, Cheng Y, Stafford R, Haacke E. MO-F-211-07: Quantifying Magnetic Susceptibility of Veneous Blood by the Complex Sum Method in MRI. Med Phys 2011. [DOI: 10.1118/1.3613038] [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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37
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Lee SCK, Wang C, Hsieh C. One-stop navigation for cancer support: Assisting unmet needs according to own initiatives. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e16636] [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: 11/20/2022] Open
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38
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Hsieh C, Liu C, Hsieh Y, Tai H, Wang L, Tsai T, Chen Y. Role of matrix metalloproteinase-8 in the modulation of systemic 5-fluorouracil pharmacokinetics by local irradiation. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.4_suppl.466] [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] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
466 Background: Concurrent chemoradiation with 5-fluorouracil (5-FU) is widely accepted for cancer treatment. However, the interactions between radiation and 5-FU remain unclear. We evaluated the influence of local irradiation on the pharmacokinetics of 5-FU in rats. Methods: The single-fraction radiation was delivered to the whole pelvic fields of Sprague-Dawley rats from a linear accelerator after computerized tomography-based planning. 5-FU at 100 mg/kg was intravenously infused 24 hours after radiation. A high-performance liquid chromatography system equipped with a UV detector was used to measure 5-FU in the blood. Matrix metalloproteinase-8 (MMP-8) inhibitor I was administered to the rats to examine whether or not RT modulation of 5-FU pharmacokinetic parameters could be blocked. Results: Compared with sham-irradiated controls, whole pelvic irradiation reduced the area under the concentration versus time curve (AUC) of 5-FU in plasma and, in contrast, increased the AUC in bile in a radiation dose-dependent manner. Based on protein array analysis, the amount of plasma MMP-8 was increased by whole pelvic irradiation (2.8-fold by 0.5 Gy and 5.3-fold by 2 Gy) in comparison with controls. Pretreatment with MMP-8 inhibitor reversed the effect of irradiation on AUC of 5-FU in plasma. Conclusions: Local irradiation may modulate the systemic pharmacokinetics of 5-FU through stimulating the release of MMP-8. This unexpected influence is worthy of further investigation and for consideration in clinical practice of radiotherapy for cancer. No significant financial relationships to disclose.
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Affiliation(s)
- C. Hsieh
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
| | - C. Liu
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
| | - Y. Hsieh
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
| | - H. Tai
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
| | - L. Wang
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
| | - T. Tsai
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
| | - Y. Chen
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
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Marko M, Leith A, Hsieh C, Danev R. Retrofit implementation of Zernike phase plate imaging for cryo-TEM. J Struct Biol 2011; 174:400-12. [PMID: 21272647 DOI: 10.1016/j.jsb.2011.01.005] [Citation(s) in RCA: 14] [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] [Received: 12/07/2010] [Revised: 01/17/2011] [Accepted: 01/19/2011] [Indexed: 10/18/2022]
Abstract
In-focus phase-plate imaging is particularly beneficial for cryo-TEM because it offers a substantial overall increase in image contrast, without an electron dose penalty, and it simplifies image interpretation. We show how phase-plate cryo-TEM can be implemented with an appropriate existing TEM, and provide a basic practical introduction to use of thin-film (carbon) phase plates. We point out potential pitfalls of phase-plate operation, and discuss solutions. We provide information on evaluating a particular TEM for its suitability.
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Affiliation(s)
- Michael Marko
- Resource for Visualization of Biological Complexity, Wadsworth Center, New York State Department of Health, Empire State Plaza, Albany, NY 12201-0509, USA.
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Hsieh C, Chia E, Huang K, Lu J, Pouliopoulos J, Barry T, Thomas S, Kovoor P. Evolution of an early ablation of post-myocardial infarct ventricular tachycardia in an ovine model. Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.236] [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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41
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Hsieh C, Cheng Y, Haacke E. TH-D-201C-07: A Quantitative Approach to Extracting Magnetic Susceptibilities of Small Cylindrical Objects from Clinical MRI Sequences. Med Phys 2010. [DOI: 10.1118/1.3469555] [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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Chik W, Barry M, Malchano Z, Huang K, Lu J, Pouliopoulos J, Hsieh C, Ross D, Thomas S, Kovoor P, Thiagalingam A. Utility of Direct Full-Colour Endovascular Visualisation in Identifying Gaps and Achieve Electrical Conduction Block. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.939] [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: 12/01/2022]
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43
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Hsieh C, Chia E, Huang K, Lu J, Pouliopoulos J, Kovoor P. Post-myocardial Infarction Evolution of Left Ventricular Electrophysiological Substrate. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.882] [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: 10/19/2022]
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44
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Chia E, Hsieh C, Leung D, Thomas L. 2D Speckle Tracking Strain for assessment of RV function in Healthy Normals. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.387] [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: 10/19/2022]
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45
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Huang R, Davidson B, Kuznetsov V, Hsieh C, Thiery J. O392 Identification of genomic alterations of human ovarian carcinoma with genome-wide copy number analysis. Int J Gynaecol Obstet 2009. [DOI: 10.1016/s0020-7292(09)60764-5] [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: 11/30/2022]
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46
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Lee H, Chong N, Tien H, Lin C, Yen H, Shueng P, Wu L, Hsieh C, Chen C. SU-FF-T-342: Evaluation of Superficial Dose for Helical Tomotherapy with GAFCHROMIC® EBT Film. Med Phys 2009. [DOI: 10.1118/1.3181823] [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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47
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Hsieh C, Cheng Y, Tackett R, Kumar R, Lawes G, Haacke E. TH-D-304A-02: Quantifying Magnetic Moments and Susceptibilities of Small Spherical Objects in MRI. Med Phys 2009. [DOI: 10.1118/1.3182694] [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: 11/07/2022] Open
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Chia E, Hsieh C, Leung D, Thomas L. Age Related Exercise Induced Changes on Right Ventricular Systolic and Diastolic Function in a Healthy Adult Population. Heart Lung Circ 2009. [DOI: 10.1016/j.hlc.2009.05.032] [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: 11/16/2022]
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Hsieh C, Cheng Y, Haacke E, Neelavalli J. TU-D-332-03: Quantifying Magnetic Moments of Small Spherical Objects in MRI Images. Med Phys 2008. [DOI: 10.1118/1.2962594] [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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