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Westerhoff JM, Daamen LA, Christodouleas JP, Blezer ELA, Choudhury A, Westley RL, Erickson BA, Fuller CD, Hafeez S, van der Heide UA, Intven MPW, Kirby AM, Lalondrelle S, Minsky BD, Mook S, Nowee ME, Marijnen CAM, Orrling KM, Sahgal A, Schultz CJ, Faivre-Finn C, Tersteeg RJHA, Tree AC, Tseng CL, Schytte T, Silk DM, Eggert D, Luzzara M, van der Voort van Zyp JRN, Verkooijen HM, Hall WA. Safety and Tolerability of Online Adaptive High-Field Magnetic Resonance-Guided Radiotherapy. JAMA Netw Open 2024; 7:e2410819. [PMID: 38691356 PMCID: PMC11063805 DOI: 10.1001/jamanetworkopen.2024.10819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 03/06/2024] [Indexed: 05/03/2024] Open
Abstract
Importance In 2018, the first online adaptive magnetic resonance (MR)-guided radiotherapy (MRgRT) system using a 1.5-T MR-equipped linear accelerator (1.5-T MR-Linac) was clinically introduced. This system enables online adaptive radiotherapy, in which the radiation plan is adapted to size and shape changes of targets at each treatment session based on daily MR-visualized anatomy. Objective To evaluate safety, tolerability, and technical feasibility of treatment with a 1.5-T MR-Linac, specifically focusing on the subset of patients treated with an online adaptive strategy (ie, the adapt-to-shape [ATS] approach). Design, Setting, and Participants This cohort study included adults with solid tumors treated with a 1.5-T MR-Linac enrolled in Multi Outcome Evaluation for Radiation Therapy Using the MR-Linac (MOMENTUM), a large prospective international study of MRgRT between February 2019 and October 2021. Included were adults with solid tumors treated with a 1.5-T MR-Linac. Data were collected in Canada, Denmark, The Netherlands, United Kingdom, and the US. Data were analyzed in August 2023. Exposure All patients underwent MRgRT using a 1.5-T MR-Linac. Radiation prescriptions were consistent with institutional standards of care. Main Outcomes and Measures Patterns of care, tolerability, and technical feasibility (ie, treatment completed as planned). Acute high-grade radiotherapy-related toxic effects (ie, grade 3 or higher toxic effects according to Common Terminology Criteria for Adverse Events version 5.0) occurring within the first 3 months after treatment delivery. Results In total, 1793 treatment courses (1772 patients) were included (median patient age, 69 years [range, 22-91 years]; 1384 male [77.2%]). Among 41 different treatment sites, common sites were prostate (745 [41.6%]), metastatic lymph nodes (233 [13.0%]), and brain (189 [10.5%]). ATS was used in 1050 courses (58.6%). MRgRT was completed as planned in 1720 treatment courses (95.9%). Patient withdrawal caused 5 patients (0.3%) to discontinue treatment. The incidence of radiotherapy-related grade 3 toxic effects was 1.4% (95% CI, 0.9%-2.0%) in the entire cohort and 0.4% (95% CI, 0.1%-1.0%) in the subset of patients treated with ATS. There were no radiotherapy-related grade 4 or 5 toxic effects. Conclusions and Relevance In this cohort study of patients treated on a 1.5-T MR-Linac, radiotherapy was safe and well tolerated. Online adaptation of the radiation plan at each treatment session to account for anatomic variations was associated with a low risk of acute grade 3 toxic effects.
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Affiliation(s)
- Jasmijn M. Westerhoff
- University Medical Center Utrecht, Division of Imaging and Oncology, Utrecht, the Netherlands
| | - Lois A. Daamen
- University Medical Center Utrecht, Division of Imaging and Oncology, Utrecht, the Netherlands
| | - John P. Christodouleas
- Elekta AB, Stockholm, Sweden
- Department of Radiation Oncology, Hospital of the University of Pennsylvania, Philadelphia
| | - Erwin L. A. Blezer
- University Medical Center Utrecht, Division of Imaging and Oncology, Utrecht, the Netherlands
| | - Ananya Choudhury
- Department of Clinical Oncology, The University of Manchester, Manchester, United Kingdom
| | - Rosalyne L. Westley
- The Royal Marsden NHS Foundation Trust, Radiation Oncology, London, United Kingdom
| | - Beth A. Erickson
- Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee
| | - Clifton D. Fuller
- Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston
| | - Shaista Hafeez
- The Royal Marsden NHS Foundation Trust, Radiation Oncology, London, United Kingdom
- The Institute of Cancer Research, London, United Kingdom
| | - Uulke A. van der Heide
- Department of Radiation Oncology, the Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Martijn P. W. Intven
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Anna M. Kirby
- The Royal Marsden NHS Foundation Trust, Radiation Oncology, London, United Kingdom
- The Institute of Cancer Research, London, United Kingdom
| | - Susan Lalondrelle
- The Royal Marsden NHS Foundation Trust, Radiation Oncology, London, United Kingdom
- The Institute of Cancer Research, London, United Kingdom
| | - Bruce D. Minsky
- Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston
| | - Stella Mook
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Marlies E. Nowee
- Department of Radiation Oncology, the Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Corrie A. M. Marijnen
- Department of Radiation Oncology, the Netherlands Cancer Institute, Amsterdam, the Netherlands
| | | | - Arjun Sahgal
- Sunnybrook Health Sciences Centre-Odette Cancer Centre, Department of Radiation Oncology, Toronto, Ontario, Canada
| | | | - Corinne Faivre-Finn
- Department of Clinical Oncology, The University of Manchester, Manchester, United Kingdom
- The Christie National Health Service Foundation Trust, Manchester, United Kingdom
| | | | - Alison C. Tree
- The Royal Marsden NHS Foundation Trust, Radiation Oncology, London, United Kingdom
- The Institute of Cancer Research, London, United Kingdom
| | - Chia-Lin Tseng
- Sunnybrook Health Sciences Centre-Odette Cancer Centre, Department of Radiation Oncology, Toronto, Ontario, Canada
| | - Tine Schytte
- Department of Oncology, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Dustin M. Silk
- Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston
| | | | | | | | - Helena M. Verkooijen
- University Medical Center Utrecht, Division of Imaging and Oncology, Utrecht, the Netherlands
| | - William A. Hall
- Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee
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de Mol van Otterloo SR, Christodouleas JP, Blezer ELA, Akhiat H, Brown K, Choudhury A, Eggert D, Erickson BA, Daamen LA, Faivre-Finn C, Fuller CD, Goldwein J, Hafeez S, Hall E, Harrington KJ, van der Heide UA, Huddart RA, Intven MPW, Kirby AM, Lalondrelle S, McCann C, Minsky BD, Mook S, Nowee ME, Oelfke U, Orrling K, Philippens MEP, Sahgal A, Schultz CJ, Tersteeg RJHA, Tijssen RHN, Tree AC, van Triest B, Tseng CL, Hall WA, Verkooijen HM. Patterns of Care, Tolerability, and Safety of the First Cohort of Patients Treated on a Novel High-Field MR-Linac Within the MOMENTUM Study: Initial Results From a Prospective Multi-Institutional Registry. Int J Radiat Oncol Biol Phys 2021; 111:867-875. [PMID: 34265394 PMCID: PMC9764331 DOI: 10.1016/j.ijrobp.2021.07.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 06/09/2021] [Accepted: 07/02/2021] [Indexed: 12/12/2022]
Abstract
PURPOSE High-field magnetic resonance-linear accelerators (MR-Linacs), linear accelerators combined with a diagnostic magnetic resonance imaging (MRI) scanner and online adaptive workflow, potentially give rise to novel online anatomic and response adaptive radiation therapy paradigms. The first high-field (1.5T) MR-Linac received regulatory approval in late 2018, and little is known about clinical use, patient tolerability of daily high-field MRI, and toxicity of treatments. Herein we report the initial experience within the MOMENTUM Study (NCT04075305), a prospective international registry of the MR-Linac Consortium. METHODS AND MATERIALS Patients were included between February 2019 and October 2020 at 7 institutions in 4 countries. We used descriptive statistics to describe the patterns of care, tolerability (the percentage of patients discontinuing their course early), and safety (grade 3-5 Common Terminology Criteria for Adverse Events v.5 acute toxicity within 3 months after the end of treatment). RESULTS A total 943 patients participated in the MOMENTUM Study, 702 of whom had complete baseline data at the time of this analysis. Patients were primarily male (79%) with a median age of 68 years (range, 22-93) and were treated for 39 different indications. The most frequent indications were prostate (40%), oligometastatic lymph node (17%), brain (12%), and rectal (10%) cancers. The median number of fractions was 5 (range, 1-35). Six patients discontinued MR-Linac treatments, but none due to an inability to tolerate repeated high-field MRI. Of the 415 patients with complete data on acute toxicity at 3-month follow-up, 18 (4%) patients experienced grade 3 acute toxicity related to radiation. No grade 4 or 5 acute toxicity related to radiation was observed. CONCLUSIONS In the first 21 months of our study, patterns of care were diverse with respect to clinical utilization, body sites, and radiation prescriptions. No patient discontinued treatment due to inability to tolerate daily high-field MRI scans, and the acute radiation toxicity experience was encouraging.
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Affiliation(s)
| | | | - Erwin L A Blezer
- Division of Imaging, University Medical Center Utrecht, Utrecht, Netherlands
| | | | | | - Ananya Choudhury
- The University of Manchester and The Christie National Health Service Foundation Trust, Manchester, United Kingdom
| | | | - Beth A Erickson
- Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Lois A Daamen
- Division of Imaging, University Medical Center Utrecht, Utrecht, Netherlands
| | - Corinne Faivre-Finn
- The University of Manchester and The Christie National Health Service Foundation Trust, Manchester, United Kingdom
| | - Clifton D Fuller
- Department of Radiation Oncology, University of Texas MD Anderson Cancer Center Houston, Houston, Texas
| | | | - Shaista Hafeez
- The Royal Marsden NHS Foundation Trust and The Institute of Cancer, London, United Kingdom
| | - Emma Hall
- Clinical Trials and Statistics Unit, The Institute of Cancer Research, London, United Kingdom
| | - Kevin J Harrington
- The Royal Marsden NHS Foundation Trust and The Institute of Cancer, London, United Kingdom
| | - Uulke A van der Heide
- Department of Radiation Oncology, Netherlands Cancer Institute, Amsterdam, Netherlands
| | - Robert A Huddart
- The Royal Marsden NHS Foundation Trust and The Institute of Cancer, London, United Kingdom
| | - Martijn P W Intven
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, Netherlands
| | - Anna M Kirby
- The Royal Marsden NHS Foundation Trust and The Institute of Cancer, London, United Kingdom
| | - Susan Lalondrelle
- The Royal Marsden NHS Foundation Trust and The Institute of Cancer, London, United Kingdom
| | - Claire McCann
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre/Odette Cancer Centre, Toronto, Ontario
| | - Bruce D Minsky
- Department of Radiation Oncology, University of Texas MD Anderson Cancer Center Houston, Houston, Texas
| | - Stella Mook
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, Netherlands
| | - Marlies E Nowee
- Department of Radiation Oncology, Netherlands Cancer Institute, Amsterdam, Netherlands
| | - Uwe Oelfke
- The Royal Marsden NHS Foundation Trust and The Institute of Cancer, London, United Kingdom
| | | | | | - Arjun Sahgal
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre/Odette Cancer Centre, Toronto, Ontario
| | - Christopher J Schultz
- Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Robbert J H A Tersteeg
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, Netherlands
| | - Rob H N Tijssen
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, Netherlands
| | - Alison C Tree
- The Royal Marsden NHS Foundation Trust and The Institute of Cancer, London, United Kingdom
| | - Baukelien van Triest
- Department of Radiation Oncology, Netherlands Cancer Institute, Amsterdam, Netherlands
| | - Chia-Lin Tseng
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre/Odette Cancer Centre, Toronto, Ontario
| | - William A Hall
- Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Helena M Verkooijen
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, Netherlands; Division of Imaging, University Medical Center Utrecht, Utrecht, Netherlands.
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de Mol van Otterloo SR, Christodouleas JP, Blezer ELA, Akhiat H, Brown K, Choudhury A, Eggert D, Erickson BA, Faivre-Finn C, Fuller CD, Goldwein J, Hafeez S, Hall E, Harrington KJ, van der Heide UA, Huddart RA, Intven MPW, Kirby AM, Lalondrelle S, McCann C, Minsky BD, Mook S, Nowee ME, Oelfke U, Orrling K, Sahgal A, Sarmiento JG, Schultz CJ, Tersteeg RJHA, Tijssen RHN, Tree AC, van Triest B, Hall WA, Verkooijen HM. The MOMENTUM Study: An International Registry for the Evidence-Based Introduction of MR-Guided Adaptive Therapy. Front Oncol 2020; 10:1328. [PMID: 33014774 PMCID: PMC7505056 DOI: 10.3389/fonc.2020.01328] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 06/25/2020] [Indexed: 11/28/2022] Open
Abstract
Purpose: MR-guided Radiation Therapy (MRgRT) allows for high-precision radiotherapy under real-time MR visualization. This enables margin reduction and subsequent dose escalation which may lead to higher tumor control and less toxicity. The Unity MR-linac (Elekta AB, Stockholm, Sweden) integrates a linear accelerator with a 1.5T diagnostic quality MRI and an online adaptive workflow. A prospective international registry was established to facilitate the evidence-based implementation of the Unity MR-linac into clinical practice, to systemically evaluate long-term outcomes, and to aid further technical development of MR-linac-based MRgRT. Methods and Results: In February 2019, the Multi-OutcoMe EvaluatioN of radiation Therapy Using the MR-linac study (MOMENTUM) started within the MR-linac Consortium. The MOMENTUM study is an international academic-industrial partnership between several hospitals and industry partner Elekta. All patients treated on the MR-linac are eligible for inclusion in MOMENTUM. For participants, we collect clinical patient data (e.g., patient, tumor, and treatment characteristics) and technical patient data which is defined as information generated on the MR-linac during treatment. The data are captured, pseudonymized, and stored in an international registry at set time intervals up to two years after treatment. Patients can choose to provide patient-reported outcomes and consent to additional MRI scans acquired on the MR-linac. This registry will serve as a data platform that supports multicenter research investigating the MR-linac. Rules and regulations on data sharing, data access, and intellectual property rights are summarized in an academic-industrial collaboration agreement. Data access rules ensure secure data handling and research integrity for investigators and institutions. Separate data access rules exist for academic and industry partners. This study is registered at ClinicalTrials.gov with ID: NCT04075305 (https://clinicaltrials.gov/ct2/show/NCT04075305). Conclusion: The multi-institutional MOMENTUM study has been set up to collect clinical and technical patient data to advance technical development, and facilitate evidenced-based implementation of MR-linac technology with the ultimate purpose to improve tumor control, survival, and quality of life of patients with cancer.
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Affiliation(s)
| | | | - Erwin L. A. Blezer
- Division of Imaging, University Medical Center Utrecht, Utrecht, Netherlands
| | | | | | - Ananya Choudhury
- The Christie National Health Service Foundation Trust, Manchester, United Kingdom
| | | | - Beth A. Erickson
- Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Corinne Faivre-Finn
- The Christie National Health Service Foundation Trust, Manchester, United Kingdom
| | - Clifton D. Fuller
- Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | | | - Shaista Hafeez
- The Royal Marsden NHS Foundation Trust and the Institute of Cancer Research, London, United Kingdom
| | - Emma Hall
- Clinical Trials and Statistics Unit, The Institute of Cancer Research, London, United Kingdom
| | - Kevin J. Harrington
- The Royal Marsden NHS Foundation Trust and the Institute of Cancer Research, London, United Kingdom
| | - Uulke A. van der Heide
- Department of Radiation Oncology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | - Robert A. Huddart
- The Royal Marsden NHS Foundation Trust and the Institute of Cancer Research, London, United Kingdom
| | - Martijn P. W. Intven
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, Netherlands
| | - Anna M. Kirby
- The Royal Marsden NHS Foundation Trust and the Institute of Cancer Research, London, United Kingdom
| | - Susan Lalondrelle
- The Royal Marsden NHS Foundation Trust and the Institute of Cancer Research, London, United Kingdom
| | - Claire McCann
- Department of Radiation Oncology, Sunnybrook Health Sciences Center/Odette Cancer Center, Toronto, ON, Canada
| | - Bruce D. Minsky
- Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - Stella Mook
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, Netherlands
| | - Marlies E. Nowee
- Department of Radiation Oncology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | - Uwe Oelfke
- The Royal Marsden NHS Foundation Trust and the Institute of Cancer Research, London, United Kingdom
| | | | - Arjun Sahgal
- Department of Radiation Oncology, Sunnybrook Health Sciences Center/Odette Cancer Center, Toronto, ON, Canada
| | - Jeffrey G. Sarmiento
- Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - Christopher J. Schultz
- Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, WI, United States
| | | | - Rob H. N. Tijssen
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, Netherlands
| | - Alison C. Tree
- The Royal Marsden NHS Foundation Trust and the Institute of Cancer Research, London, United Kingdom
| | - Baukelien van Triest
- Department of Radiation Oncology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | - William A. Hall
- Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, WI, United States
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Kok JL, Teepen JC, van Leeuwen FE, Tissing WJE, Neggers SJCMM, van der Pal HJ, Loonen JJ, Bresters D, Versluys B, van den Heuvel-Eibrink MM, van Dulmen-den Broeder E, van der Heiden-van der Loo M, Aleman BMP, Daniels LA, Haasbeek CJA, Hoeben B, Janssens GO, Maduro JH, Oldenburger F, van Rij C, Tersteeg RJHA, Hauptmann M, Kremer LCM, Ronckers CM. Risk of benign meningioma after childhood cancer in the DCOG-LATER cohort: contributions of radiation dose, exposed cranial volume, and age. Neuro Oncol 2020; 21:392-403. [PMID: 30099534 DOI: 10.1093/neuonc/noy124] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [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: 12/24/2022] Open
Abstract
BACKGROUND Pediatric cranial radiotherapy (CrRT) markedly increases risk of meningiomas. We studied meningioma risk factors with emphasis on independent and joint effects of CrRT dose, exposed cranial volume, exposure age, and chemotherapy. METHODS The Dutch Cancer Oncology Group-Long-Term Effects after Childhood Cancer (DCOG-LATER) cohort includes 5-year childhood cancer survivors (CCSs) whose cancers were diagnosed in 1963-2001. Histologically confirmed benign meningiomas were identified from the population-based Dutch Pathology Registry (PALGA; 1990-2015). We calculated cumulative meningioma incidence and used multivariable Cox regression and linear excess relative risk (ERR) modeling. RESULTS Among 5843 CCSs (median follow-up: 23.3 y, range: 5.0-52.2 y), 97 developed a benign meningioma, including 80 after full- and 14 after partial-volume CrRT. Compared with CrRT doses of 1-19 Gy, no CrRT was associated with a low meningioma risk (hazard ratio [HR] = 0.04, 95% CI: 0.01-0.15), while increased risks were observed for CrRT doses of 20-39 Gy (HR = 1.66, 95% CI: 0.83-3.33) and 40+ Gy (HR = 2.81, 95% CI: 1.30-6.08). CCSs whose cancers were diagnosed before age 5 versus 10-17 years showed significantly increased risks (HR = 2.38, 95% CI: 1.39-4.07). In this dose-adjusted model, volume was not significantly associated with increased risk (HR full vs partial = 1.66, 95% CI: 0.86-3.22). Overall, the ERR/Gy was 0.30 (95% CI: 0.03-unknown). Dose effects did not vary significantly according to exposure age or CrRT volume. Cumulative incidence after any CrRT was 12.4% (95% CI: 9.8%-15.2%) 40 years after primary cancer diagnosis. Among chemotherapy agents (including methotrexate and cisplatin), only carboplatin (HR = 3.55, 95% CI: 1.62-7.78) appeared associated with meningioma risk. However, we saw no carboplatin dose-response and all 9 exposed cases had high-dose CrRT. CONCLUSION After CrRT 1 in 8 survivors developed late meningioma by age 40 years, associated with radiation dose and exposure age, relevant for future treatment protocols and awareness among survivors and physicians.
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Affiliation(s)
- Judith L Kok
- Department of Pediatric Oncology, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.,Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | - Jop C Teepen
- Department of Pediatric Oncology, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.,Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | - Flora E van Leeuwen
- Department of Epidemiology and Biostatistics, the Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Wim J E Tissing
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands.,Department of Pediatric Oncology/Hematology, University of Groningen, Beatrix Children's Hospital, University Medical Center Groningen, Groningen, the Netherlands
| | - Sebastian J C M M Neggers
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands.,Department of Pediatric Oncology/Hematology and Medicine section Endocrinology, Sophia Children's Hospital/Erasmus Medical Center, Rotterdam, the Netherlands
| | | | - Jacqueline J Loonen
- Department of Hematology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Dorine Bresters
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | - Birgitta Versluys
- Department of Pediatric Oncology and Hematology, Wilhelmina Children's Hospital/University Medical Center Utrecht, Utrecht, the Netherlands
| | - Marry M van den Heuvel-Eibrink
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands.,Department of Pediatric Oncology/Hematology, Sophia Children's Hospital/Erasmus Medical Center, Rotterdam, the Netherlands
| | - Eline van Dulmen-den Broeder
- Department of Pediatric Oncology/Hematology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | | | - Berthe M P Aleman
- Department of Radiation Oncology, the Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Laurien A Daniels
- Department of Radiation Oncology, Leiden University Medical Center, Leiden, the Netherlands
| | - Cornelis J A Haasbeek
- Department of Radiation Oncology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Bianca Hoeben
- Department of Radiation Oncology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Geert O Janssens
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands.,Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - John H Maduro
- Department of Radiation Oncology, University of Groningen/University Medical Center Groningen, Groningen, the Netherlands
| | - Foppe Oldenburger
- Department of Radiation Oncology, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - Caroline van Rij
- Department of Radiation Oncology, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Robbert J H A Tersteeg
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Michael Hauptmann
- Department of Epidemiology and Biostatistics, the Netherlands Cancer Institute, Amsterdam, the Netherlands
| | | | - Leontien C M Kremer
- Department of Pediatric Oncology, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.,Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | - Cécile M Ronckers
- Department of Pediatric Oncology, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.,Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
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5
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Fermé C, Thomas J, Brice P, Casasnovas O, Vranovsky A, Bologna S, Lugtenburg PJ, Bouabdallah R, Carde P, Sebban C, Eghbali H, Salles G, van Imhoff GW, Thyss A, Noordijk EM, Reman O, Lybeert MLM, Janvier M, Spina M, Audhuy B, Raemaekers JMM, Delarue R, Anglaret B, de Weerdt O, Marjanovic Z, Tersteeg RJHA, de Jong D, Brière J, Henry-Amar M. ABVD or BEACOPP baseline along with involved-field radiotherapy in early-stage Hodgkin Lymphoma with risk factors: Results of the European Organisation for Research and Treatment of Cancer (EORTC)-Groupe d'Étude des Lymphomes de l'Adulte (GELA) H9-U intergroup randomised trial. Eur J Cancer 2017; 81:45-55. [PMID: 28601705 DOI: 10.1016/j.ejca.2017.05.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 04/25/2017] [Accepted: 05/02/2017] [Indexed: 11/26/2022]
Abstract
PURPOSE For early-stage Hodgkin lymphoma (HL), optimal chemotherapy regimen and the number of cycles to be delivered remain to settle down. The H9-U trial compared three modalities of chemotherapy followed by involved-field radiotherapy (IFRT) in patients with stage I-II HL and risk factors (NCT00005584). PATIENTS AND METHODS Patients aged 15-70 years with untreated supradiaphragmatic HL with at least one risk factor (age ≥ 50, involvement of 4-5 nodal areas, mediastinum/thoracic ratio ≥ 0.35, erythrocyte sedimentation rate (ESR) ≥ 50 without B-symptoms or ESR ≥ 30 and B-symptoms) were eligible for the randomised, open label, multicentre, non-inferiority H9-U trial. The limit of non-inferiority was set at 10% for the difference between 5-year event-free survival (EFS) estimates. From October 1998 to September 2002, 808 patients were randomised to receive either the control arm 6-ABVD-IFRT (n = 276), or one of the two experimental arms: 4-ABVD-IFRT (n = 277) or 4-BEACOPPbaseline-IFRT (n = 255). RESULTS Results in the 4-ABVD-IFRT (5-year EFS, 85.9%) and the 4-BEACOPPbaseline-IFRT (5-year EFS, 88.8%) were not inferior to 6-ABVD-IFRT (5-year EFS, 89.9%): difference of 4.0% (90%CI, -0.7%-8.8%) and of 1.1% (90%CI,-3.5%-5.6%) respectively. The 5-year overall survival estimates were 94%, 93%, and 93%, respectively. Patients treated with combined modality treatment chemotherapeutic regimen comprising doxorubicin (Adriamycin), bleomycin, vincristine (Oncovin), cyclophosphamide, procarbazine, etoposide and prednisone (BEACOPP)baseline more often developed serious adverse events requiring supportive measures and hospitalisation compared with patients receiving the chemotherapeutic regimen comprising doxorubicin (Adriamycin), bleomycin, vinblastine and dacarbazine (ABVD). CONCLUSIONS The trial demonstrates that 4-ABVD followed by IFRT yields high disease control in patients with early-stage HL and risk factors responding to chemotherapy. Although non-inferior in terms of efficacy, four cycles of BEACOPPbaseline were more toxic than four or six cycles of ABVD.
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Affiliation(s)
- Christophe Fermé
- Gustave Roussy, 114 Rue Édouard Vaillant, 94805 Villejuif Cedex, France
| | - José Thomas
- University Hospital Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium
| | - Pauline Brice
- Centre Hospitalier Universitaire, Hôpital Saint-Louis, 1 Avenue Claude Vellefaux, 75010 Paris, France
| | - Olivier Casasnovas
- Centre Hospitalier Universitaire, Hôpital du Bocage, 1 Boulevard Jeanne d'Arc, 21000 Dijon, France
| | - Andrej Vranovsky
- National Cancer Institute, Klenova 1, 83310 Bratislava, Slovakia
| | - Serge Bologna
- Centre Hospitalier Universitaire de Nancy, Hôpital Brabois, Rue du Morvan, 54511 Vandœuvre-lès-Nancy, France
| | | | - Réda Bouabdallah
- Institut Paoli Calmettes, 232 Boulevard Sainte-Marguerite, BP156, 13273 Marseille Cedex 09, France
| | - Patrice Carde
- Gustave Roussy, 114 Rue Édouard Vaillant, 94805 Villejuif Cedex, France
| | | | - Houchingue Eghbali
- Institut Bergonié, 229 Cours de l'Argonne, CS 61283, 33076 Bordeaux Cedex, France
| | - Gilles Salles
- Centre Hospitalier Lyon Sud, Chemin du Grand Revoyet, 69310 Pierre-Bénite, France
| | - Gustaaf W van Imhoff
- University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, P.O. Box 30.001, 9700 RB Groningen, The Netherlands
| | - Antoine Thyss
- Centre Antoine Lacassagne, 33 Avenue de Valombrose, 06189 Nice Cedex 2, France
| | - Evert M Noordijk
- Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
| | - Oumédaly Reman
- Centre Hospitalier Universitaire, Avenue de la Côte de Nacre, 14033 Caen, France
| | - Marnix L M Lybeert
- Catharina Ziekenhuis, Michelangelolaan 2, 5623 EJ Eindhoven, The Netherlands
| | - Maud Janvier
- Institut Curie-Hôpital René-Huguenin, 35 Rue Dailly, 92210 Saint-Cloud, France
| | - Michele Spina
- Centro di Riferimento Oncologico, Via Franco Gallini, 2, 33081 Aviano, PN, Italy
| | - Bruno Audhuy
- Hôpitaux Civils de Colmar, Hôpital Pasteur, 39 Avenue de la Liberté, 68024 Colmar Cedex, France
| | - John M M Raemaekers
- Radboud University Nijmegen Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Richard Delarue
- Centre Hospitalier Universitaire, Hôpital Necker, 149 Rue de Sèvres, 75015 Paris, France
| | - Bruno Anglaret
- Centre Hospitalier de Valence, 179 Avenue du Maréchal Juin, 26953 Valence, France
| | - Okke de Weerdt
- St. Antonius Ziekenhuis Nieuwegein, Koekoekslaan 1, 3435 CM Nieuwegein, The Netherlands
| | - Zora Marjanovic
- Centre Hospitalier Universitaire, Hôpital Saint-Antoine, 184 Rue du faubourg Saint-Antoine, 75012 Paris, France
| | | | - Daphne de Jong
- VU University Medical Center, Department of Pathology, De Boelelaan 1117, 1081HV Amsterdam, The Netherlands
| | - Josette Brière
- Centre Hospitalier Universitaire, Hôpital Saint-Louis, 1 Avenue Claude Vellefaux, 75010 Paris, France
| | - Michel Henry-Amar
- Centre de Traitement des Données du Cancéropôle Nord-Ouest, Centre François Baclesse, 3 Avenue Général Harris, 14076 Caen Cedex 05, France.
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DEN Hartogh MD, Philippens MEP, VAN Dam IE, Kleynen CE, Tersteeg RJHA, Kotte ANTJ, VAN Vulpen M, VAN Asselen B, VAN DEN Bongard DHJG. Post-lumpectomy CT-guided tumor bed delineation for breast boost and partial breast irradiation: Can additional pre- and postoperative imaging reduce interobserver variability? Oncol Lett 2015; 10:2795-2801. [PMID: 26722244 PMCID: PMC4665376 DOI: 10.3892/ol.2015.3697] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [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: 08/07/2014] [Accepted: 04/20/2015] [Indexed: 12/20/2022] Open
Abstract
For breast boost radiotherapy or accelerated partial breast irradiation, the tumor bed (TB) is delineated by the radiation oncologist on a planning computed tomography (CT) scan. The aim of the present study was to investigate whether the interobserver variability (IOV) of the TB delineation is reduced by providing the radiation oncologist with additional magnetic resonance imaging (MRI) or CT scans. A total of 14 T1-T2 breast cancer patients underwent a standard planning CT in the supine treatment position following lumpectomy, as well as additional pre- and postoperative imaging in the same position. Post-lumpectomy TBs were independently delineated by four breast radiation oncologists on standard postoperative CT and on CT registered to an additional imaging modality. The additional imaging modalities used were postoperative MRI, preoperative contrast-enhanced (CE)-CT and preoperative CE-MRI. A cavity visualization score (CVS) was assigned to each standard postoperative CT by each observer. In addition, the conformity index (CI), volume and distance between centers of mass (dCOM) of the TB delineations were calculated. On CT, the median CI was 0.57, with a median volume of 22 cm3 and dCOM of 5.1 mm. The addition of postoperative MRI increased the median TB volume significantly to 28 cm3 (P<0.001), while the CI (P=0.176) and dCOM (P=0.110) were not affected. The addition of preoperative CT or MRI increased the TB volume to 26 and 25 cm3, respectively (both P<0.001), while the CI increased to 0.58 and 0.59 (both P<0.001) and the dCOM decreased to 4.7 mm (P=0.004) and 4.6 mm (P=0.001), respectively. In patients with CVS≤3, the median CI was 0.40 on CT, which was significantly increased by all additional imaging modalities, up to 0.52, and was accompanied by a median volume increase up to 6 cm3. In conclusion, the addition of postoperative MRI, preoperative CE-CT or preoperative CE-MRI did not result in a considerable reduction in the IOV in postoperative CT-guided TB delineation, while target volumes marginally increased. The value of additional imaging may be dependent on CVS.
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Affiliation(s)
- Mariska D DEN Hartogh
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Marielle E P Philippens
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Iris E VAN Dam
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Catharina E Kleynen
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Robbert J H A Tersteeg
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Alexis N T J Kotte
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Marco VAN Vulpen
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Bram VAN Asselen
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
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den Hartogh MD, Philippens MEP, van Dam IE, Kleynen CE, Tersteeg RJHA, Kotte ANTJ, van Vulpen M, van Asselen B, van den Bongard DHJG. Abstract P5-14-17: Post-lumpectomy tumorbed delineation for breast boost or partial breast irradiation: The influence of additional MRI and CT imaging. Cancer Res 2013. [DOI: 10.1158/0008-5472.sabcs13-p5-14-17] [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: 11/16/2022]
Abstract
Abstract
Rationale/Purpose
In early stage breast cancer patients, most recurrences occur in the vicinity of the original tumor location. Therefore, after initial lumpectomy it is important to accurately delineate the tumorbed (TB) area for breast boost and partial breast irradiation on the planning-CT scan. However, consistency in TB delineation among radiation oncologists is low on standard CT imaging.
The purpose of this study was to determine whether additional pre- and postoperative MRI and CT imaging could increase consistency in standard CT-guided target volume delineation among radiation oncologists.
Methods
Fourteen cT1-2 patients underwent MRI and CT imaging in supine radiotherapy position before and after lumpectomy. TBs were delineated by 4 breast radiation oncologists following delineation guidelines on the standard postoperative planning-CT alone, and planning-CT registered to 1) postoperative MRI (T1 (with and without fat suppression) and T2 weighted sequences) 2) preoperative contrast-enhanced (CE) CT, and 3) preoperative CE-MRI (T1 weighted sequence with fat suppression). Consistency was defined by the conformity index (CI), which was calculated by dividing the encompassing volume of each observer pair, by the volume of overlap for each observer pair. Furthermore, volumes and the distance between centres of mass (dCOM) of the delineated TBs were determined. A Wilcoxon signed-rank test was performed to compare variables between different imaging modalities, with a significance level of a = 0.05.
Results
Results of the analysis are shown in Table 1. Addition of a postoperative MRI to the standard postoperative planning CT did not influence the CI (p = 0.176) or dCOM (p = 0.110). However, the TB volumes increased significantly with a median increase of 6 cm3 (p<0.001). Addition of a preoperative CT or MRI increased the CI by 0.01 and 0.02 (both p<0.001). Furthermore, preoperative CT and MRI increased dCOM (p = 0.004 and p = 0.001) and volumes (both p<0.001).
Table 1 medianrange p-valueVolume (cm3) CT224-934 CT + postoperative MRI283-964<0.001CT + preoperative CT266-933<0.001CT + preoperative MRI257-933<0.001 Conformity index CT0.570.00-0.90 CT + postoperative MRI0.610.00-0.890.176CT + preoperative CT0.580.00-0.90<0.001CT + preoperative MRI0.590.00-0.89<0.001 dCOM (mm) CT50-53 CT + postoperative MRI40-520.110CT + preoperative CT31-420.004CT + preoperative MRI50-480.001
Conclusion
Although significant, the addition of postoperative MRI, preoperative CE-CT or preoperative CE-MRI did not result in a clinically relevant improvement of the consistency in postoperative CT-guided TB delineation among radiation oncologists. Furthermore, target volumes increased with all imaging modalities.
Citation Information: Cancer Res 2013;73(24 Suppl): Abstract nr P5-14-17.
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Affiliation(s)
| | | | - IE van Dam
- University Medical Center Utrecht, Utrecht, Netherlands
| | - CE Kleynen
- University Medical Center Utrecht, Utrecht, Netherlands
| | - RJHA Tersteeg
- University Medical Center Utrecht, Utrecht, Netherlands
| | - ANTJ Kotte
- University Medical Center Utrecht, Utrecht, Netherlands
| | - M van Vulpen
- University Medical Center Utrecht, Utrecht, Netherlands
| | - B van Asselen
- University Medical Center Utrecht, Utrecht, Netherlands
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Tersteeg RJHA, Roesink JM, Albregts M, Wárlám-Rodenhuis CC, van Asselen B. Changes in excision cavity volume: prediction of the reduction in absolute volume during breast irradiation. Int J Radiat Oncol Biol Phys 2008; 74:1181-5. [PMID: 19117693 DOI: 10.1016/j.ijrobp.2008.09.056] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2008] [Revised: 09/15/2008] [Accepted: 09/17/2008] [Indexed: 12/28/2022]
Abstract
PURPOSE The aim of this study was to determine the changes in the excision cavity volume due to the resolution of the surgical effects during the whole breast treatment. MATERIALS AND METHODS Seventy-seven patients with early-stage (T1-2 N0) breast cancer treated with breast-conserving therapy were included for this study. All patients underwent a standard planning computed tomography (CT) scan before irradiation treatment. A second CT scan was performed in the week before the start of the boost. Excision cavity volumes were delineated based on the surgical clips and the (surrounding) seroma or hematoma or other surgical changes on both scans by an experienced physician. This resulted in the gross tumor volumes GTV1 and GTV2. RESULTS The delineated volumes of the GTVs were on average 78.7 cm(3) (range, 1.1-236.0 cm(3)) and 29.7 cm(3) (range, 1.3-123.6 cm(3)) for, respectively, GTV1 and GTV2. The time between the CT scans was on average 37 days (range, 29-74 days). This resulted in a reduction of on average 62%. The absolute reduction per day of the GTV1 was -1.3 cm(3)/day (range, 0.3 to -5.4 cm(3)/day). A linear correlation (correlation coefficient r(2) = 0.81) was observed between the absolute volume of GTV1 and the absolute reduction per day. CONCLUSION A significant reduction in excision cavity volume during whole breast irradiation was shown. The observed correlation might be helpful in the decision to perform a second CT scan to adapt the treatment plan.
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Struikmans H, Wárlám-Rodenhuis C, Stam T, Stapper G, Tersteeg RJHA, Bol GH, Raaijmakers CPJ. Interobserver variability of clinical target volume delineation of glandular breast tissue and of boost volume in tangential breast irradiation. Radiother Oncol 2005; 76:293-9. [PMID: 16165237 DOI: 10.1016/j.radonc.2005.03.029] [Citation(s) in RCA: 145] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2004] [Revised: 03/04/2005] [Accepted: 03/21/2005] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND PURPOSE To determine the interobserver variability of clinical target volume delineation of glandular breast tissue and of boost volume in tangential breast irradiation. PATIENTS AND METHODS Eighteen consecutive patients with left sided breast cancer treated by breast conserving surgery agreed to participate in our study. Volumes of the glandular breast tissue (CTV breast) and of the boost (CTV boost) were delineated by five observers. We determined 'conformity indices' (CI) and the ratio between the volume of each CTV and the mean volume of all CTVs (CTV ratio). Subsequently we determined the most medial, lateral, anterior, posterior, cranial and caudal extensions both of CTV breast and CTV boost for all observers separately. RESULTS The mean CI breast was 0.87. For one observer we noted the highest CTV ratio in 17 out of 18 cases. No association was noted between CI breast and menopausal status. The mean CI boost was 0.56. We did not find a relation between the presence or absence of clips and the CI boost. For another observer we noted the lowest CTV boost ratio in 10 out of 17 cases. CONCLUSIONS We recommend that each institute should determine its interobserver variability with respect to CTV breast and CTV boost before implementing the delineation of target volumes by planning CT in daily practice.
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Affiliation(s)
- Henk Struikmans
- Department of Radiotherapy, University Medical Centre, Ultrecht, The Netherlands.
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Jürgenliemk-Schulz IM, Hartman LJC, Roesink JM, Tersteeg RJHA, van Der Tweel I, Kal HB, Mourits MP, Wyrdeman HK. Prevention of pterygium recurrence by postoperative single-dose β-irradiation: a prospective randomized clinical double-blind trial. Int J Radiat Oncol Biol Phys 2004; 59:1138-47. [PMID: 15234049 DOI: 10.1016/j.ijrobp.2003.12.021] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2003] [Revised: 12/09/2003] [Accepted: 12/10/2003] [Indexed: 11/19/2022]
Abstract
PURPOSE To affirm the effectiveness and complication rate of postoperative single-dose beta-irradiation (RT) with (90)Sr in the case of primary pterygium in a clinical trial. Pterygium is a benign disease of the supporting orbital tissue that can cause impairment of visual function. Depending on the technique used for surgery, recurrence is described in up to 70% of cases-a reason to combine the initial treatment with radiotherapy or chemotherapy. METHODS AND MATERIALS This trial was designed as a prospective, randomized, multicenter, double-blind study. Surgery was performed in all cases according to the bare sclera technique. Ninety-one patients with 96 pterygia were postoperatively randomized to either beta-RT or sham RT. In the case of beta-RT, a (90)Sr eye applicator was used to deliver 2500 cGy to the sclera surface at a dose rate of between 200 and 250 cGy/min. Sham RT was given using the same type of applicator without the (90)Sr layer. After treatment, both an ophthalmologist and a radiation oncologist performed the follow-up examinations. The accumulated data were analyzed using a group sequential test. RESULTS Between February 1998 and September 2002, 96 eyes with primary pterygium were operated on according to the trial protocol. Additional treatment was performed within 24 hours postoperatively. Ten patients were lost to follow-up, resulting in 86 patients who could be analyzed. In the 44 eyes randomized to receive beta-RT, 3 relapses occurred compared with 28 recurrences in the 42 eyes that received sham RT, for a crude control rate of 93.2% vs. 33.3%, respectively. At a mean follow-up of 18 months, major treatment complications had not been observed. CONCLUSION Single-dose beta-RT after bare sclera surgery is a simple, effective, and safe treatment that reduces the risk of primary pterygium recurrence.
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Affiliation(s)
- Ina M Jürgenliemk-Schulz
- Department of Radiation Oncology, University Medical Centre Utrecht, Heidelberglaan 100, NL-3584 CX Utrecht, The Netherlands.
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