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  1. Article ; Online: Systematic Implementation of Effective Quality Assurance Processes for the Assessment of Radiation Target Volumes in Head and Neck Cancer.

    Gogineni, E / Schaefer, D / Ewing, A / Andraos, T / DiCostanzo, D / Weldon, M / Christ, D / Baliga, S / Jhawar, S / Mitchell, D / Grecula, J / Konieczkowski, D J / Palmer, J / Jahraus, T / Dibs, K / Chakravarti, A / Martin, D / Gamez, M E / Blakaj, D

    Practical radiation oncology

    2024  Volume 14, Issue 3, Page(s) e205–e213

    Abstract: Purpose: Significant heterogeneity exists in clinical quality assurance (QA) practices within radiation oncology departments, with most chart rounds lacking prospective peer-reviewed contour evaluation. This has the potential to significantly affect ... ...

    Abstract Purpose: Significant heterogeneity exists in clinical quality assurance (QA) practices within radiation oncology departments, with most chart rounds lacking prospective peer-reviewed contour evaluation. This has the potential to significantly affect patient outcomes, particularly for head and neck cancers (HNC) given the large variance in target volume delineation. With this understanding, we incorporated a prospective systematic peer contour-review process into our workflow for all patients with HNC. This study aims to assess the effectiveness of implementing prospective peer review into practice for our National Cancer Institute Designated Cancer Center and to report factors associated with contour modifications.
    Methods and materials: Starting in November 2020, our department adopted a systematic QA process with real-time metrics, in which contours for all patients with HNC treated with radiation therapy were prospectively peer reviewed and graded. Contours were graded with green (unnecessary), yellow (minor), or red (major) colors based on the degree of peer-recommended modifications. Contours from November 2020 through September 2021 were included for analysis.
    Results: Three hundred sixty contours were included. Contour grades were made up of 89.7% green, 8.9% yellow, and 1.4% red grades. Physicians with >12 months of clinical experience were less likely to have contour changes requested than those with <12 months (8.3% vs 40.9%; P < .001). Contour grades were significantly associated with physician case load, with physicians presenting more than the median number of 50 cases having significantly less modifications requested than those presenting <50 (6.7% vs 13.3%; P = .013). Physicians working with a resident or fellow were less likely to have contour changes requested than those without a trainee (5.2% vs 12.6%; P = .039). Frequency of major modification requests significantly decreased over time after adoption of prospective peer contour review, with no red grades occurring >6 months after adoption.
    Conclusions: This study highlights the importance of prospective peer contour-review implementation into systematic clinical QA processes for HNC. Physician experience proved to be the highest predictor of approved contours. A growth curve was demonstrated, with major modifications declining after prospective contour review implementation. Even within a high-volume academic practice with subspecialist attendings, >10% of patients had contour changes made as a direct result of prospective peer review.
    MeSH term(s) Humans ; Head and Neck Neoplasms/radiotherapy ; Quality Assurance, Health Care/standards ; Radiotherapy Planning, Computer-Assisted/methods ; Radiotherapy Planning, Computer-Assisted/standards ; Prospective Studies ; Female ; Radiation Oncology/standards ; Radiation Oncology/methods ; Male
    Language English
    Publishing date 2024-01-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2655748-4
    ISSN 1879-8519 ; 1879-8500
    ISSN (online) 1879-8519
    ISSN 1879-8500
    DOI 10.1016/j.prro.2023.12.012
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The Radiosurgery Society Case-Based Discussion of the Management of Head and Neck or Skull Base Paragangliomas with Stereotactic Radiosurgery and Radiotherapy.

    Ehret, Felix / Ebner, Daniel K / McComas, Kyra N / Gogineni, Emile / Andraos, Therese / Kim, Minsun / Lo, Simon / Schulder, Michael / Redmond, Kristin J / Muacevic, Alexander / Shih, Helen A / Kresl, John

    Practical radiation oncology

    2024  Volume 14, Issue 3, Page(s) 225–233

    Abstract: Stereotactic radiosurgery (SRS) and fractionated stereotactic radiotherapy (FSRT) have been used for the treatment of head and neck or skull base paraganglioma for a considerable time, demonstrating promising local control rates and a favorable safety ... ...

    Abstract Stereotactic radiosurgery (SRS) and fractionated stereotactic radiotherapy (FSRT) have been used for the treatment of head and neck or skull base paraganglioma for a considerable time, demonstrating promising local control rates and a favorable safety profile compared with surgical approaches. Nevertheless, the choice of treatment must be carefully tailored to each patient's preferences, tumor location, and size, as well as anticipated treatment-related morbidity. This case-based review serves as a practical and concise guide for the use of SRS and FSRT in the management of head and neck or skull base paragangliomas, providing information on the diagnosis, treatment, follow-up considerations, and potential pitfalls.
    MeSH term(s) Humans ; Radiosurgery/methods ; Paraganglioma/radiotherapy ; Paraganglioma/pathology ; Paraganglioma/surgery ; Skull Base Neoplasms/radiotherapy ; Skull Base Neoplasms/surgery ; Head and Neck Neoplasms/radiotherapy ; Head and Neck Neoplasms/surgery ; Male ; Middle Aged ; Female ; Aged ; Adult
    Language English
    Publishing date 2024-01-16
    Publishing country United States
    Document type Journal Article ; Case Reports ; Review
    ZDB-ID 2655748-4
    ISSN 1879-8519 ; 1879-8500
    ISSN (online) 1879-8519
    ISSN 1879-8500
    DOI 10.1016/j.prro.2023.12.011
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Stereotactic Body Radiation Therapy: A Radiosurgery Society Guide to the Treatment of Localized Prostate Cancer Illustrated by Challenging Cases.

    Ma, Ting Martin / Ladbury, Colton / Tran, Maxwell / Keiper, Timothy D / Andraos, Therese / Gogineni, Emile / Mohideen, Najeeb / Siva, Shankar / Loblaw, Andrew / Tree, Alison C / Cheung, Patrick / Kresl, John / Collins, Sean / Cao, Minsong / Kishan, Amar U

    Practical radiation oncology

    2023  Volume 14, Issue 2, Page(s) e117–e131

    Abstract: Traditionally, external beam radiotherapy (EBRT) for localized prostate cancer (PCa) involved lengthy courses with low daily doses. However, advancements in radiation delivery and a better understanding of prostate radiobiology have enabled the ... ...

    Abstract Traditionally, external beam radiotherapy (EBRT) for localized prostate cancer (PCa) involved lengthy courses with low daily doses. However, advancements in radiation delivery and a better understanding of prostate radiobiology have enabled the development of shorter courses of EBRT. Ultrahypofractionated radiotherapy, administering doses greater than 5 Gy per fraction, is now considered a standard of care regimen for localized PCa, particularly for intermediate-risk disease. Stereotactic body radiotherapy (SBRT), a specific type of ultrahypofractionated radiotherapy employing advanced planning, imaging, and treatment technology to deliver in five or fewer fractions, is gaining prominence as a cost-effective, convenient, and safe alternative to longer radiotherapy courses. It is crucial to address practical considerations related to patient selection, fractionation scheme, target delineation, and planning objectives. This is especially important in challenging clinical situations where clear evidence for guidance may be lacking. The Radiosurgery Society endorses this case-based guide with the aim of providing a practical framework for delivering SBRT to the intact prostate, exemplified by two case studies. The article will explore common SBRT dose/fractionation schemes and dose constraints for organs-at-risk. Additionally, it will review existing evidence and expert opinions on topics such as SBRT dose escalation, the use of rectal spacers, the role of androgen deprivation therapy in the context of SBRT, SBRT in special patient populations (e.g., high-risk disease, large prostate, high baseline urinary symptom burdens, and inflammatory bowel disease), as well as new imaging-guidance techniques like Magnetic Resonance Imaging for SBRT delivery.
    MeSH term(s) Male ; Humans ; Radiosurgery ; Prostatic Neoplasms/radiotherapy ; Androgen Antagonists ; Prostate ; Radiation Oncology
    Chemical Substances Androgen Antagonists
    Language English
    Publishing date 2023-09-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2655748-4
    ISSN 1879-8519 ; 1879-8500
    ISSN (online) 1879-8519
    ISSN 1879-8500
    DOI 10.1016/j.prro.2023.08.011
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Stereotactic Radiosurgery in the Management of Brain Metastases: A Case-Based Radiosurgery Society Practice Guideline.

    Ladbury, Colton / Pennock, Michael / Yilmaz, Tugba / Ankrah, Nii-Kwanchie / Andraos, Therese / Gogineni, Emile / Kim, Grace Gwe-Ya / Gibbs, Iris / Shih, Helen A / Hattangadi-Gluth, Jona / Chao, Samuel T / Pannullo, Susan C / Slotman, Ben / Redmond, Kristin J / Lo, Simon S / Schulder, Michael

    Advances in radiation oncology

    2023  Volume 9, Issue 3, Page(s) 101402

    Abstract: Purpose: Brain metastases are common among adult patients with solid malignancies and are increasingly being treated with stereotactic radiosurgery (SRS). As more patients with brain metastases are becoming eligible for SRS, there is a need for ... ...

    Abstract Purpose: Brain metastases are common among adult patients with solid malignancies and are increasingly being treated with stereotactic radiosurgery (SRS). As more patients with brain metastases are becoming eligible for SRS, there is a need for practical review of patient selection and treatment considerations.
    Methods and materials: Two patient cases were identified to use as the foundation for a discussion of a wide and representative range of management principles: (A) SRS alone for 5 to 15 lesions and (B) a large single metastasis to be treated with pre- or postoperative SRS. Patient selection, fractionation, prescription dose, treatment technique, and dose constraints are discussed. Literature relevant to these cases is summarized to provide a framework for treatment of similar patients.
    Results: Treatment of brain metastases with SRS requires many considerations including optimal patient selection, fractionation selection, and plan optimization.
    Conclusions: Case-based practice guidelines developed by the Radiosurgery Society provide a practical guide to the common scenarios noted above affecting patients with metastatic brain tumors.
    Language English
    Publishing date 2023-11-03
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 2452-1094
    ISSN 2452-1094
    DOI 10.1016/j.adro.2023.101402
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Randomized, Prospective, Open-label Phase III Trial Comparing Mebo Ointment With Biafine Cream for the Management of Acute Dermatitis During Radiotherapy for Breast Cancer.

    Geara, Fady B / Eid, Toufic / Zouain, Nicolas / Thebian, Ranim / Andraos, Therese / Chehab, Chirine / Ramia, Paul / Youssef, Bassem / Zeidan, Youssef H

    American journal of clinical oncology

    2018  Volume 41, Issue 12, Page(s) 1257–1262

    Abstract: Purpose: Acute radiation dermatitis is a common side-effect of radiotherapy in breast cancer and has a profound impact on patients' quality of life, due to pain and discomfort. The aim of this study is to compare the effect of β-sitosterol (Mebo) ... ...

    Abstract Purpose: Acute radiation dermatitis is a common side-effect of radiotherapy in breast cancer and has a profound impact on patients' quality of life, due to pain and discomfort. The aim of this study is to compare the effect of β-sitosterol (Mebo) ointment to trolamine (Biafine) cream for the prevention and treatment of radiation dermatitis in breast cancer patients receiving adjuvant radiation therapy.
    Materials and methods: This is a prospective open-label randomized phase III study developed to assess the efficacy of 2 topical agents used for management of acute radiation dermatitis. Female breast cancer patients who needed a course of radiation therapy in our institution were enrolled and randomized into 2 groups 1 with Mebo ointment and 1 with Biafine cream. Both medications were applied twice per day during the whole period of treatment and skin reactions and related symptoms were assessed weekly during the entire course. Grading of skin reactions was done according to the Radiation Therapy Oncology Group grading system.
    Results: Between September 2015 and May 2017, a total of 161 patients were recruited for this trial. Mean age was similar for both groups (50.19±12.57 vs. 51.73±11.23, respectively, P=0.41). All other patients and treatment characteristics were similar in both groups, except for the use of boost (82.7% in the Biafine group vs. 36.7% in Mebo group, P=0.012). Analysis was done for reactions recorded before the beginning of the boost and for the entire course including the boost. Using univariate and multivariate analysis, there was no significant difference in grades 2 and 3 dermatitis between the 2 groups. However, the incidence of severe pruritus and severe local skin pain were both significantly reduced in the Mebo group (14.1% in Biafine vs. 2.9% in Mebo, P=0.016 for pruritus and 11.5% vs. 1.4%, respectively, P=0.02 for severe pain).
    Conclusions: This study showed no difference between Mebo and Biafine in the incidence and severity of breast skin dermatitis during radiation therapy. However, the use of Mebo ointment was associated with decreased severe pruritus and pain which could positively affect patient comfort and quality of life.
    MeSH term(s) Administration, Topical ; Breast Neoplasms/pathology ; Breast Neoplasms/radiotherapy ; Carcinoma, Ductal, Breast/pathology ; Carcinoma, Ductal, Breast/radiotherapy ; Carcinoma, Intraductal, Noninfiltrating/pathology ; Carcinoma, Intraductal, Noninfiltrating/radiotherapy ; Carcinoma, Lobular/pathology ; Carcinoma, Lobular/radiotherapy ; Dermatologic Agents/administration & dosage ; Disease Management ; Emulsions/administration & dosage ; Female ; Follow-Up Studies ; Humans ; Lipids/administration & dosage ; Middle Aged ; Prognosis ; Prospective Studies ; Radiodermatitis/drug therapy ; Radiodermatitis/etiology ; Radiodermatitis/pathology ; Radiotherapy/adverse effects ; Sitosterols/administration & dosage
    Chemical Substances Biafine ; Dermatologic Agents ; Emulsions ; Lipids ; Sitosterols ; moist exposed burn ointment
    Language English
    Publishing date 2018-06-11
    Publishing country United States
    Document type Clinical Trial, Phase III ; Comparative Study ; Journal Article ; Randomized Controlled Trial
    ZDB-ID 604536-4
    ISSN 1537-453X ; 0277-3732
    ISSN (online) 1537-453X
    ISSN 0277-3732
    DOI 10.1097/COC.0000000000000460
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Early Stage Extranodal Follicular Lymphoma: Characteristics, Management, and Outcomes.

    Andraos, Therese / Ayoub, Zeina / Nastoupil, Loretta / Pinnix, Chelsea / Milgrom, Sarah / Gunther, Jillian / Ng, Sweet Ping / Fowler, Nathan / Neelapu, Sattva / Samaniego, Felipe / Dabaja, Bouthaina

    Clinical lymphoma, myeloma & leukemia

    2019  Volume 19, Issue 6, Page(s) 381–389

    Abstract: Introduction: Extranodal follicular lymphoma (E-FL) is a rare entity that has distinct characteristics and outcomes compared with nodal follicular lymphoma.: Patients and methods: This cohort comprised 37 patients with stages I/II E-FL, diagnosed ... ...

    Abstract Introduction: Extranodal follicular lymphoma (E-FL) is a rare entity that has distinct characteristics and outcomes compared with nodal follicular lymphoma.
    Patients and methods: This cohort comprised 37 patients with stages I/II E-FL, diagnosed from 2003 to 2013. Outcomes included progression-free survival (PFS), and overall survival (OS). Survival outcomes were calculated using Kaplan-Meier methods.
    Results: Median age was 60 years (range, 37-84 years). Disease was stage I in 29 (78.4%). The Follicular Lymphoma International Prognostic Index score was 0 to 1 in 31 (83.8%), 2 in 2 (5.4%), 3 in 1 (2.7%), and missing in 3 (8.1%). Sites of involvement included the gastrointestinal (GI) tract in 22 (59.5%), and non-GI sites in 15 (40.5%). Initial management consisted of chemotherapy (CHT) alone in 21 (56.8%), radiation therapy (RT) alone in 2 patients (5.4%), RT and rituximab in 1 (2.7%), CHT and RT in 7 (18.9%), and observation in 6 (16.2%). RT was to a median dose of 30.6 Gy (range, 23.4-44.0 Gy). At a median follow-up of 69 months (range, 8-157 months), 5-year PFS and OS were 70.4% and 94.4%, respectively. Although the 5-year PFS of those observed was worse than for those who received therapy (33.3% vs. 77.6%; P = .011), that did not translate into an OS difference. Patients who received RT as part of upfront management had a 100% local control (LC) rate and a trend toward improved 5-year PFS (90% vs. 62.2%; P = .067).
    Conclusion: Early stage E-FL is an indolent disease and is associated with excellent OS. Treatment strategies should be individualized with RT prioritized when LC is a significant goal.
    MeSH term(s) Adult ; Aged ; Aged, 80 and over ; Disease Management ; Female ; Humans ; Kaplan-Meier Estimate ; Lymphoma, Follicular/diagnosis ; Lymphoma, Follicular/mortality ; Lymphoma, Follicular/therapy ; Male ; Middle Aged ; Neoplasm Grading ; Neoplasm Staging ; Prognosis ; Severity of Illness Index ; Time-to-Treatment
    Language English
    Publishing date 2019-02-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2540992-X
    ISSN 2152-2669 ; 2152-2650
    ISSN (online) 2152-2669
    ISSN 2152-2650
    DOI 10.1016/j.clml.2019.02.011
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  7. Article ; Online: Limited stage grade 3 follicular lymphoma patients can experience favorable outcomes with combined modality therapy.

    Ayoub, Zeina / Andraos, Therese / Milgrom, Sarah A / Pinnix, Chelsea C / Dabaja, Bouthaina S / Ng, Sweet Ping / Gunther, Jillian R / Khoury, Joseph D / Fowler, Nathan H / Neelapu, Satva S / Samaniego, Felipe / Fayad, Luis E / Nastoupil, Loretta J

    Leukemia & lymphoma

    2019  Volume 60, Issue 10, Page(s) 2432–2440

    Abstract: Controversy exists regarding the optimal management of limited stage grade 3 follicular lymphoma (FL3). We assessed the treatment outcomes of 190 consecutive patients with stage I-II FL. Fifty two patients had FL3 disease, in whom the median age was 55 ... ...

    Abstract Controversy exists regarding the optimal management of limited stage grade 3 follicular lymphoma (FL3). We assessed the treatment outcomes of 190 consecutive patients with stage I-II FL. Fifty two patients had FL3 disease, in whom the median age was 55 years. At a median follow-up of 65 months, 5-year progression-free survival (PFS) and overall survival (OS) rates were 76.6% and 87.6%, respectively. Patients receiving systemic therapy followed by radiation therapy (RT) had a significantly better PFS (
    MeSH term(s) Adult ; Aged ; Biomarkers ; Combined Modality Therapy ; Disease Progression ; Female ; Humans ; Lymphoma, Follicular/diagnosis ; Lymphoma, Follicular/mortality ; Lymphoma, Follicular/pathology ; Lymphoma, Follicular/therapy ; Male ; Middle Aged ; Neoplasm Grading ; Neoplasm Staging ; Prognosis ; Treatment Outcome
    Chemical Substances Biomarkers
    Language English
    Publishing date 2019-04-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1042374-6
    ISSN 1029-2403 ; 1042-8194
    ISSN (online) 1029-2403
    ISSN 1042-8194
    DOI 10.1080/10428194.2019.1597081
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  8. Article ; Online: Prognostic significance of O6-methylguanine-DNA-methyltransferase (MGMT) promoter methylation and isocitrate dehydrogenase-1 (IDH-1) mutation in glioblastoma multiforme patients: A single-center experience in the Middle East region.

    Ayoub, Zeina / Geara, Fady / Najjar, Marwan / Comair, Youssef / Khoueiry-Zgheib, Nathalie / Khoueiry, Pierre / Mahfouz, Rami / Boulos, Fouad I / Kamar, Francois G / Andraos, Therese / Saadeh, Fadi / Kreidieh, Firas / Abboud, Miguel / Skaf, Ghassan / Assi, Hazem I

    Clinical neurology and neurosurgery

    2019  Volume 182, Page(s) 92–97

    Abstract: Objectives: To determine the prevalence and prognostic value of MGMT promoter methylation and IDH1 mutation in glioblastoma multiforme (GBM) patients from the Middle East.: Patients and methods: Records of patients diagnosed between 2003 and 2015 ... ...

    Abstract Objectives: To determine the prevalence and prognostic value of MGMT promoter methylation and IDH1 mutation in glioblastoma multiforme (GBM) patients from the Middle East.
    Patients and methods: Records of patients diagnosed between 2003 and 2015 were reviewed. MGMT promoter methylation was measured using methylation-specific polymerase chain reaction and IDH-1 mutation was reported. The primary endpoint was overall survival (OS).
    Results: A total of 110 patients were included. The median age was 51 years and 71 patients (64.5%) were males. The median diameter of GBM was 4.6 cm and 29 patients (26.4%) had multifocal disease. Gross total resection was achieved in 38 patients (24.9%). All patients received adjuvant radiation therapy, and 96 patients (91.4%) received concomitant temozolomide. At a median follow up of 13.6 months, the median OS was 17.2 months, and the OS at 1 and 2 years were 71.6% and 34.8%, respectively. On multivariate analysis, age at diagnosis (HR 1.019; P = 0.044) and multifocality (HR 2.373; P = 0.001) were the only independent prognostic variables. MGMT promoter methylation was found in 28.2% of patients but did not significantly correlate with survival (HR 1.160; P = 0.635). IDH-1 mutation was found in 10% of patients was associated with a non-significant trend for survival improvement (HR 0.502; P = 0.151).
    Conclusion: Patients with GBM from the Middle East have adequate survival outcomes when given the optimal treatment. In our patient population, MGMT promoter methylation did not seem to correlate with outcomes, but patients with IDH1 mutation had numerically higher survival outcomes.
    MeSH term(s) Adult ; Biomarkers, Tumor/genetics ; Brain Neoplasms/genetics ; Brain Neoplasms/surgery ; DNA Methylation/genetics ; DNA Modification Methylases/genetics ; DNA Repair Enzymes/genetics ; Female ; Glioblastoma/diagnosis ; Glioblastoma/genetics ; Humans ; Isocitrate Dehydrogenase/genetics ; Male ; Middle Aged ; O(6)-Methylguanine-DNA Methyltransferase/genetics ; Prognosis ; Promoter Regions, Genetic/genetics
    Chemical Substances Biomarkers, Tumor ; Isocitrate Dehydrogenase (EC 1.1.1.41) ; IDH1 protein, human (EC 1.1.1.42.) ; DNA Modification Methylases (EC 2.1.1.-) ; O(6)-Methylguanine-DNA Methyltransferase (EC 2.1.1.63) ; DNA Repair Enzymes (EC 6.5.1.-)
    Language English
    Publishing date 2019-04-29
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 193107-6
    ISSN 1872-6968 ; 0303-8467
    ISSN (online) 1872-6968
    ISSN 0303-8467
    DOI 10.1016/j.clineuro.2019.04.008
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: New paradigm for radiation in multiple myeloma: lower yet effective dose to avoid radiation toxicity.

    Elhammali, Adnan / Amini, Behrang / Ludmir, Ethan B / Gunther, Jillian R / Milgrom, Sarah A / Pinnix, Chelsea C / Andraos, Therese / Yoder, Alison / Weber, Donna / Orlowski, Robert / Manasanch, Elisabet / Patel, Krina / Strati, Paolo / Nair, Ranjit / Lee, Hans C / Thomas, Sheeba / Iyer, Swaminathan / Kaufmann, Gregory / Garg, Naveen /
    Dabaja, Bouthaina S

    Haematologica

    2020  Volume 105, Issue 7, Page(s) e355–e357

    MeSH term(s) Humans ; Multiple Myeloma ; Radiation Injuries/epidemiology ; Radiation Injuries/etiology ; Radiation Injuries/prevention & control
    Language English
    Publishing date 2020-01-09
    Publishing country Italy
    Document type Letter ; Research Support, N.I.H., Extramural
    ZDB-ID 2333-4
    ISSN 1592-8721 ; 0017-6567 ; 0390-6078
    ISSN (online) 1592-8721
    ISSN 0017-6567 ; 0390-6078
    DOI 10.3324/haematol.2019.235804
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Deep-Inspiration Breath-Hold Intensity Modulated Radiation Therapy to the Mediastinum for Lymphoma Patients: Setup Uncertainties and Margins.

    Aristophanous, Michalis / Chi, Pai-Chun M / Kao, Jeremy / Williamson, Ryan / Tung, Sam / Andraos, Therese / Milgrom, Sarah A / Pinnix, Chelsea C / Dabaja, Bouthaina S

    International journal of radiation oncology, biology, physics

    2017  

    Abstract: Purpose: Patient setup for treating large target volumes can be challenging. In the present study, we measured the local uncertainties in the treatment of mediastinal lymphoma and investigated the need for region-specific planning target volume (PTV) ... ...

    Abstract Purpose: Patient setup for treating large target volumes can be challenging. In the present study, we measured the local uncertainties in the treatment of mediastinal lymphoma and investigated the need for region-specific planning target volume (PTV) margins.
    Methods and materials: The data from 30 patients who had undergone radiation therapy for mediastinal lymphoma were retrospectively analyzed. A computed tomography (CT)-on-rails (CTOR) system in the treatment room was used for daily image guidance. The total PTV was split into 6 regions: neck, supraclavicular fossa, axilla, mediastinum, upper heart, and lower heart. The total PTV and the 6 local regions were separately aligned to the planning CT scan using automatic rigid registration. The residual local errors using 3 setup strategies were investigated: no image guidance, CTOR setup to total PTV, and simulated cone beam CT setup to the mediastinum. Errors were recorded in the anteroposterior, superoinferior, and right-left directions separately. Using the residual error calculations, the margins required to cover 95% of the clinical target volume for 90% of the patients was estimated.
    Results: For each patient, 12 to 21 days of daily CTOR data were available for analysis. The residual errors for the total PTV and mediastinum setups were both smaller than those with no image guidance. The lower heart region had more uncertainty with all 3 setup strategies. Margin analysis revealed that the magnitude of the margin is dependent on the imaging strategy, direction, and local region inside the PTV. Margins >7 mm are necessary to account for uncertainty in the neck, lower heart, and axilla regions even under daily CT guidance.
    Conclusions: Setup uncertainties in the mediastinum are not uniform and are dependent on target location and imaging strategy. However, with the appropriate margin, we can target regions that might not be visualized with the available on-board imager system.
    Language English
    Publishing date 2017-09-25
    Publishing country United States
    Document type Journal Article
    ZDB-ID 197614-x
    ISSN 1879-355X ; 0360-3016
    ISSN (online) 1879-355X
    ISSN 0360-3016
    DOI 10.1016/j.ijrobp.2017.09.036
    Database MEDical Literature Analysis and Retrieval System OnLINE

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