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Palta J, Yeung D. MO-SAM-BRB-03: CE-Therapy - SAM. Med Phys 2009. [DOI: 10.1118/1.3182189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Yeung D, Frouhar V, Palta J. MO-FF-A4-06: A DICOM-RT PACS for Peer Review, Quality Assurance and Clinical Outcome Studies in Proton Therapy. Med Phys 2009. [DOI: 10.1118/1.3182300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Tsang J, Yeung D, Chan A, Wong C, Leung L, Lo C, Fung L, Epstein R, Kwong A. 0173 Predictive value of 18F-FDG PET-CT in primary breast cancer patients receiving neoadjuvant chemotherapy. Breast 2009. [DOI: 10.1016/s0960-9776(09)70196-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Lin L, Vargas C, Hsi W, Indelicato D, Slopsema R, Li Z, Yeung D, Horne D, Palta J. Dosimetric uncertainty in prostate cancer proton radiotherapy. Med Phys 2009; 35:4800-7. [PMID: 19070212 DOI: 10.1118/1.2982242] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE The authors we evaluate the uncertainty in proton therapy dose distribution for prostate cancer due to organ displacement, varying penumbra width of proton beams, and the amount of rectal gas inside the rectum. METHODS AND MATERIALS Proton beam treatment plans were generated for ten prostate patients with a minimum dose of 74.1 cobalt gray equivalent (CGE) to the planning target volume (PTV) while 95% of the PTV received 78 CGE. Two lateral or lateral oblique proton beams were used for each plan. The authors we investigated the uncertainty in dose to the rectal wall (RW) and the bladder wall (BW) due to organ displacement by comparing the dose-volume histograms (DVH) calculated with the original or shifted contours. The variation between DVHs was also evaluated for patients with and without rectal gas in the rectum for five patients who had 16 to 47 cc of visible rectal gas in their planning computed tomography (CT) imaging set. The uncertainty due to the varying penumbra width of the delivered protons for different beam setting options on the proton delivery system was also evaluated. RESULTS For a 5 mm anterior shift, the relative change in the RW volume receiving 70 CGE dose (V70) was 37.9% (5.0% absolute change in 13.2% of a mean V70). The relative change in the BW volume receiving 70 CGE dose (V70) was 20.9% (4.3% absolute change in 20.6% of a mean V70) with a 5 mm inferior shift. A 2 mm penumbra difference in beam setting options on the proton delivery system resulted in the relative variations of 6.1% (0.8% absolute change) and 4.4% (0.9% absolute change) in V70 of RW and BW, respectively. The data show that the organ displacements produce absolute DVH changes that generally shift the entire isodose line while maintaining the same shape. The overall shape of the DVH curve for each organ is determined by the penumbra and the distance of the target in beam's eye view (BEV) from the block edge. The beam setting option producing a 2 mm sharper penumbra at the isocenter can reduce the magnitude of maximal doses to the RW by 2% compared to the alternate option utilizing the same block margin of 7 mm. The dose to 0.1 cc of the femoral head on the distal side of the lateral-posterior oblique beam is increased by 25 CGE for a patient with 25 cc of rectal gas. CONCLUSION Variation in the rectal and bladder wall DVHs due to uncertainty in the position of the organs relative to the location of sharp dose falloff gradients should be accounted for when evaluating treatment plans. The proton beam delivery option producing a sharper penumbra reduces maximal doses to the rectal wall. Lateral-posterior oblique beams should be avoided in patients prone to develop a large amount of rectal gas.
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Khan A, Yeung D, Wyatt B, Rafai T, Byant J, Coates A, Fitzgerald E, Acheson A, Wilson V. Effects of statins on postoperative sepsis, systemic inflammatory response syndrome and mortality after colorectal surgery. Crit Care 2009. [PMCID: PMC2776220 DOI: 10.1186/cc8103] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Yeung AR, Vargas CE, Falchook A, Louis D, Olivier K, Keole S, Yeung D, Mendenhall NP, Li Z. Dose–Volume Differences for Computed Tomography and Magnetic Resonance Imaging Segmentation and Planning for Proton Prostate Cancer Therapy. Int J Radiat Oncol Biol Phys 2008; 72:1426-33. [DOI: 10.1016/j.ijrobp.2008.03.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2007] [Revised: 02/06/2008] [Accepted: 03/12/2008] [Indexed: 10/21/2022]
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Duvvuri S, Keole S, Aldana P, Morris C, Vargas C, Yeung D, Boes P, Li Z, Palta J, Hsi W. Comparison of Patient Positioning Accuracy using Fiducial or Anatomical Markers for Proton Cranial Radiotherapy. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.1454] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Malyapa R, Mendenhall W, Yeung D, Li Z, McKenzie C, Lanza D, Mendenhall N. Proton Therapy of Paranasal Sinus Tumors: The UFPTI Experience. Skull Base 2008. [DOI: 10.1055/s-2008-1093269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Rodriguez C, Chera B, Morris C, Yeung D, Olivier K, Louis D, Li Z, Mendenhall N. Proton Radiotherapy for Hodgkin's Lymphoma. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Chera B, Vargas C, Flampouri S, Morris C, Yeung D, Olivier K, Duvvuri S, Li Z, Mendenhall N. Pelvic Proton Radiotherapy for High-risk Prostate Cancer. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.1113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Han J, Yeung D, Wang F, Semin D. Determination of Residual Isobutylene Oxide--A Genotoxic Starting Material in a Drug Substance by Static Headspace Gas Chromatography. J Chromatogr Sci 2008; 46:637-42. [DOI: 10.1093/chromsci/46.7.637] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Slopsema R, Lin L, McKenzie C, Yeung D, Li Z, Hsi W, Palta J. SU-GG-T-532: Dosimetric Comparison of Proton Delivery Techniques: Double-Scattering and Uniform-Scanning. Med Phys 2008. [DOI: 10.1118/1.2962281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Flampouri S, Slopsema R, Yeung D, Malyapa R, Keole S, Vargas C, Li Z. TH-D-M100E-05: Realistic Estimation of Proton Range Uncertainties and Dosimetric Implications. Med Phys 2007. [DOI: 10.1118/1.2761732] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Lin L, Vargas C, Li Z, Horne D, Chellini A, Yeung D, Palta J. SU-FF-T-374: Robustness of Proton Versus IMRT Treatment Plans in the Presence of Target Motion for Prostate Cancers. Med Phys 2007. [DOI: 10.1118/1.2761099] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Chvetsov A, Palta J, Yeung D. SU-FF-T-279: Lateral Distribution of a Proton Pencil Beam Which Is Consistent with Range Straggling. Med Phys 2007. [DOI: 10.1118/1.2760941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Slopsema R, Yeung D, Flampouri S, Lin L, Zhao Z, Li Z. SU-FF-T-297: Monitor Unit Calculation in Eclipse Proton Therapy Treatment Planning. Med Phys 2007. [DOI: 10.1118/1.2760959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Li Z, Slopsema R, Flampouri S, Yeung D, Lin L, Zhao Z, Palta J. SU-FF-T-33: A Periodic Machine QA Program for Proton Therapy. Med Phys 2007. [DOI: 10.1118/1.2760678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Zhu TC, Li Z, Karunamuni R, Yeung D, Slopsema R. SU-FF-T-12: A Fluence-Based Algorithm for MU Calculation of Proton Beams. Med Phys 2007. [DOI: 10.1118/1.2760657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Degang C, Wenxiu Z, Yeung D, Tsang E. Rough approximations on a complete completely distributive lattice with applications to generalized rough sets. Inf Sci (N Y) 2006. [DOI: 10.1016/j.ins.2005.05.009] [Citation(s) in RCA: 155] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Wang XZ, He Q, Chen DG, Yeung D. A genetic algorithm for solving the inverse problem of support vector machines. Neurocomputing 2005. [DOI: 10.1016/j.neucom.2005.05.006] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Shixian Q, Dai Y, Kakuda Y, Shi J, Mittal G, Yeung D, Jiang Y. Synergistic Anti-Oxidative Effects of Lycopene with Other Bioactive Compounds. FOOD REVIEWS INTERNATIONAL 2005. [DOI: 10.1080/fri-200061612] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Zee BC, King AD, Yuen E, Ma B, Leung SF, Yeung D, Kam M, Chan A, Ahuja AT. Assessment of tumor size and tumour response for nasopharyngeal carcinoma (NPC): Implication of different methods of assessment for an Irregular shaped tumor. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.5582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Yeung D, Frouhar V, Morris C, Dillard D, Liu C, Palta J. SU-FF-T-302: A Secure Web-Based, Real-Time System for Peer-Review, Quality Assurance and Clinical Outcome Studies in Radiation Therapy. Med Phys 2005. [DOI: 10.1118/1.1998031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Liu Y, Snow BE, Hande MP, Yeung D, Erdmann NJ, Wakeham A, Itie A, Siderovski DP, Lansdorp PM, Robinson MO, Harrington L. The telomerase reverse transcriptase is limiting and necessary for telomerase function in vivo. Curr Biol 2000; 10:1459-62. [PMID: 11102810 DOI: 10.1016/s0960-9822(00)00805-8] [Citation(s) in RCA: 173] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Mammalian telomerase is essential for the maintenance of telomere length [1-5]. Its catalytic core comprises a reverse transcriptase component (TERT) and an RNA component. While the biochemical role of mammalian TERT is well established [6-11], it is unknown whether it is sufficient for telomere-length maintenance, chromosome stability or other cellular processes. Cells from mice in which the mTert gene had been disrupted showed progressive loss of telomere DNA, a phenotype similar to cells in which the gene encoding the telomerase RNA component (mTR) has been disrupted [1,12]. On prolonged growth, mTert-deficient embryonic stem (ES) cells exhibited genomic instability, aneuploidy and telomeric fusions. ES cells heterozygous for the mTert disruption also showed telomere attrition, a phenotype that differs from heterozygous mTR cells [12]. Thus, telomere maintenance in mammals is carried out by a single, limiting TERT.
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Liu Y, Snow BE, Hande MP, Baerlocher G, Kickhoefer VA, Yeung D, Wakeham A, Itie A, Siderovski DP, Lansdorp PM, Robinson MO, Harrington L. Telomerase-associated protein TEP1 is not essential for telomerase activity or telomere length maintenance in vivo. Mol Cell Biol 2000; 20:8178-84. [PMID: 11027287 PMCID: PMC86427 DOI: 10.1128/mcb.20.21.8178-8184.2000] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
TEP1 is a mammalian telomerase-associated protein with similarity to the Tetrahymena telomerase protein p80. Like p80, TEP1 is associated with telomerase activity and the telomerase reverse transcriptase, and it specifically interacts with the telomerase RNA. To determine the role of mTep1 in telomerase function in vivo, we generated mouse embryonic stem (ES) cells and mice lacking mTep1. The mTep1-deficient (mTep1(-/-)) mice were viable and were bred for seven successive generations with no obvious phenotypic abnormalities. All murine tissues from mTep1(-/-) mice possessed a level of telomerase activity comparable to that in wild-type mice. In addition, analysis of several tissues that normally lack telomerase activity revealed no reactivation of telomerase activity in mTep1(-/-) mice. Telomere length, even in later generations of mTep1(-/-) mice, was equivalent to that in wild-type animals. ES cells deficient in mTep1 also showed no detectable alteration in telomerase activity or telomere length with increased passage in culture. Thus, mTep1 appears to be completely dispensable for telomerase function in vivo. Recently, TEP1 has been identified within a second ribonucleoprotein (RNP) complex, the vault particle. TEP1 can also specifically bind to a small RNA, vRNA, which is associated with the vault particle and is unrelated in sequence to mammalian telomerase RNA. These results reveal that TEP1 is an RNA binding protein that is not restricted to the telomerase complex and that TEP1 plays a redundant role in the assembly or localization of the telomerase RNP in vivo.
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