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Boué-Raflé A, Briens A, Supiot S, Blanchard P, Baty M, Lafond C, Masson I, Créhange G, Cosset JM, Pasquier D, de Crevoisier R. [Does radiation therapy for prostate cancer increase the risk of second cancers?]. Cancer Radiother 2024; 28:293-307. [PMID: 38876938 DOI: 10.1016/j.canrad.2023.07.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 07/14/2023] [Accepted: 07/16/2023] [Indexed: 06/16/2024]
Abstract
PURPOSE The increased risk of second cancer after prostate radiotherapy is a debated clinical concern. The objective of the study was to assess the risk of occurrence of second cancers after prostate radiation therapy based on the analysis the literature, and to identify potential factors explaining the discrepancies in results between studies. MATERIALS AND METHODS A review of the literature was carried out, comparing the occurrence of second cancers in patients all presenting with prostate cancer, treated or not by radiation. RESULTS This review included 30 studies reporting the occurrence of second cancers in 2,112,000 patients treated or monitored for localized prostate cancer, including 1,111,000 by external radiation therapy and 103,000 by brachytherapy. Regarding external radiation therapy, the average follow-up was 7.3years. The majority of studies (80%) involving external radiation therapy, compared to no external radiation therapy, showed an increased risk of second cancers with a hazard ratio ranging from 1.13 to 4.9, depending on the duration of the follow-up. The median time to the occurrence of these second cancers after external radiotherapy ranged from 4 to 6years. An increased risk of second rectal and bladder cancer was observed in 52% and 85% of the studies, respectively. Considering a censoring period of more than 10 years after irradiation, 57% and 100% of the studies found an increased risk of rectal and bladder cancer, without any impact in overall survival. Studies of brachytherapy did not show an increased risk of second cancer. However, these comparative studies, most often old and retrospective, had many methodological biases. CONCLUSION Despite numerous methodological biases, prostate external radiation therapy appears associated with a moderate increase in the risk of second pelvic cancer, in particular bladder cancer, without impacting survival. Brachytherapy does not increase the risk of a second cancer.
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Affiliation(s)
- A Boué-Raflé
- Département de radiothérapie, centre Eugène-Marquis, 3, avenue de la Bataille-Flandres-Dunkerque, Rennes, France.
| | - A Briens
- Département de radiothérapie, centre Eugène-Marquis, 3, avenue de la Bataille-Flandres-Dunkerque, Rennes, France
| | - S Supiot
- Département de radiothérapie, Institut de cancérologie de l'Ouest, centre René-Gauducheau, boulevard Jacques-Monod, Saint-Herblain, France; Centre de recherche en cancérologie Nantes-Angers (CRCNA), UMR 1232, Inserm - 6299, CNRS, institut de recherche en santé de l'université de Nantes, Nantes cedex, France
| | - P Blanchard
- Département de radiothérapie oncologique, Gustave-Roussy, Villejuif, France; Oncostat U1018, Inserm, université Paris-Saclay, Villejuif, France
| | - M Baty
- Département de radiothérapie, centre Eugène-Marquis, 3, avenue de la Bataille-Flandres-Dunkerque, Rennes, France
| | - C Lafond
- Département de radiothérapie, centre Eugène-Marquis, 3, avenue de la Bataille-Flandres-Dunkerque, Rennes, France; Laboratoire Traitement du signal et de l'image (LTSI), U1099, Inserm, Rennes, France
| | - I Masson
- Département de radiothérapie, centre Eugène-Marquis, 3, avenue de la Bataille-Flandres-Dunkerque, Rennes, France
| | - G Créhange
- Département de radiothérapie, institut Curie, 25, rue d'Ulm, Paris, France; Département d'oncologie radiothérapie, centre de protonthérapie, institut Curie, Orsay, France; Département d'oncologie radiothérapie, institut Curie, 92, boulevard Dailly, Saint-Cloud, France; Laboratoire d'imagerie translationnelle en oncologie (Lito), U1288, Inserm, institut Curie, université Paris-Saclay, Orsay, France
| | - J-M Cosset
- Groupe Amethyst, centre de radiothérapie Charlebourg, 92250 La Garenne-Colombes, France
| | - D Pasquier
- Département de radiothérapie, centre Oscar-Lambret, 3, rue Frédéric-Combemale, Lille, France; CNRS, CRIStAL UMR 9189, université de Lille, Lille, France
| | - R de Crevoisier
- Département de radiothérapie, centre Eugène-Marquis, 3, avenue de la Bataille-Flandres-Dunkerque, Rennes, France; Laboratoire Traitement du signal et de l'image (LTSI), U1099, Inserm, Rennes, France
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2
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Araujo AS, Silva RMV, Souza DN. Evaluation of conventional IMRT and VMAT strategies for postmastectomy radiation therapy after immediate implant-based reconstruction using the new ESTRO-ACROP contouring guidelines. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2024; 63:59-70. [PMID: 38300284 DOI: 10.1007/s00411-024-01059-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 01/03/2024] [Indexed: 02/02/2024]
Abstract
This study evaluated the usability of conventional templates based on the new contour guidelines of the European Society of Radiation and Oncology and Advisory Committee in Radiation Oncology Practice (ESTRO-ACROP) for treatment plans of postmastectomy radiotherapy after immediate implant-based reconstruction. Intensity-modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) plans generated with two different treatment planning systems (TPSs, Eclipse and Monaco) were examined. Six computed tomography scans of patients aged 35-54 years were retrospectively analysed who had undergone mastectomy and breast reconstruction using silicone implants after being diagnosed with left breast cancer. Six radiation oncologists participated in this study, and each of them contoured the target volume of one left breast using conventional contour (CTV-CONV) and new contour (CTV-ESTRO) methods. This study showed that compared with CTV-CONV, using CTV-ESTRO with objectives and cost functions similar to those of TPSs worsened the target volume coverage and increased the total number of monitor units. Considering the organs at risk, CTV-ESTRO tended to increase the mean dose delivered to the contralateral lung. It is concluded that the approach used for the new ESTRO-ACROP contour method cannot be applied in a manner similar to that for the conventional breast contour method, implying that the new ESTRO-ACROP contour method may require more time for improving plans for a given treatment.
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Affiliation(s)
- Andreyson S Araujo
- Departamento de Física, Universidade Federal de Sergipe, São Cristóvão, SE, 49100-000, Brazil
| | | | - Divanizia N Souza
- Departamento de Física, Universidade Federal de Sergipe, São Cristóvão, SE, 49100-000, Brazil.
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Jahreiß MC, Hoogeman M, K H Aben K, Dirkx M, Snieders R, Pos FJ, Janssen T, Dekker A, Vanneste B, Minken A, Hoekstra C, Smeenk RJ, Incrocci L, Heemsbergen WD. Advances in radiotherapy and its impact on second primary cancer risk: a multi-center cohort study in prostate cancer patients. Radiother Oncol 2023; 183:109659. [PMID: 37003369 DOI: 10.1016/j.radonc.2023.109659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 03/21/2023] [Accepted: 03/21/2023] [Indexed: 04/03/2023]
Abstract
BACKGROUND Modelling studies suggest that advanced intensity-modulated radiotherapy may increase second primary cancer (SPC) risks, due to increased radiation exposure of tissues located outside the treatment fields. In the current study we investigated the association between SPC risks and characteristics of applied external beam radiotherapy (EBRT) protocols for localized prostate cancer (PCa). METHODS We collected EBRT protocol characteristics (2000-2016) from five Dutch RT institutes for the 3D-CRT and advanced EBRT era (N=7908). From the Netherlands Cancer Registry we obtained patient/tumour characteristics, SPC data, and survival information. Standardized incidence ratios (SIR) were calculated for pelvis and non-pelvis SPC. Nationwide SIRs were calculated as a reference, using calendar period as a proxy to label 3D-CRT/advanced EBRT. RESULTS From 2000-2006, 3D-CRT with 68-78 Gy in 2 Gy fractions, delivered with 10-23 MV and weekly portal imaging was the most dominant protocol. By the year 2010 all institutes routinely used advanced EBRT (IMRT, VMAT, tomotherapy), mainly delivering 78 Gy in 2Gy fractions, using various kV/MV imaging protocols. Sixteen percent (N=1268) developed ≥1 SPC. SIRs for pelvis and non-pelvis SPC (all institutes, advanced EBRT vs 3D-CRT) were 1.17 (1.00-1.36) vs 1.39 (1.21-1.59), and 1.01 (0.89-1.07) vs 1.03 (0.94-1.13), respectively. Nationwide non-pelvis SIR was 1.07 (1.01-1.13) vs 1.02 (0.98-1.07). Other RT protocol characteristics did not correlate with SPC endpoints. CONCLUSION None of the studied RT characteristics of advanced EBRT was associated with increased out-of-field SPC risks. With constantly evolving EBRT protocols, evaluation of associated SPC risks remains important.
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Affiliation(s)
- Marie-Christina Jahreiß
- Department of Radiotherapy, Erasmus MC Cancer Institute, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Mischa Hoogeman
- Department of Radiotherapy, Erasmus MC Cancer Institute, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Katja K H Aben
- Department of Research & Development, Netherlands Comprehensive Cancer Organization, Utrecht, The Netherlands; Department for Health Evidence, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Maarten Dirkx
- Department of Radiotherapy, Erasmus MC Cancer Institute, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Renier Snieders
- Department of Research & Development, Netherlands Comprehensive Cancer Organization, Utrecht, The Netherlands
| | - Floris J Pos
- Department of Radiation Oncology, The Netherlands Cancer Institute,Amsterdam, The Netherlands
| | - Tomas Janssen
- Department of Radiation Oncology, The Netherlands Cancer Institute,Amsterdam, The Netherlands
| | - Andre Dekker
- Department of Radiation Oncology (Maastro), GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center+, Maastricht, The Netherlands
| | - Ben Vanneste
- Department of Radiation Oncology (Maastro), GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center+, Maastricht, The Netherlands; Department of Human Structure and Repair; Department of Radiation Oncology, Ghent University Hospital, Belgium
| | - Andre Minken
- Radiotherapiegroep, Institute of Radiation Oncology, Arnhem/Deventer, The Netherlands
| | - Carel Hoekstra
- Radiotherapiegroep, Institute of Radiation Oncology, Arnhem/Deventer, The Netherlands
| | - Robert J Smeenk
- Department of Radiation Oncology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Luca Incrocci
- Department of Radiotherapy, Erasmus MC Cancer Institute, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Wilma D Heemsbergen
- Department of Radiotherapy, Erasmus MC Cancer Institute, University Medical Center Rotterdam, Rotterdam, The Netherlands.
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Dosimetrical assessment of jaw tracking technique in volumetric modulated arc therapy for a sample of patients with lateralised targets. JOURNAL OF RADIOTHERAPY IN PRACTICE 2023. [DOI: 10.1017/s1460396923000031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
Abstract
Introduction:
In modulated radiotherapy treatments with the jaw tracking technique (JTT), the collimator jaws can dynamically follow the multileaf collimator apertures and reduce radiation leakage. This reduction protects normal tissue from unwanted doses. Previous research has highlighted the importance of defining which patients will benefit most from JTT. Besides, some authors have expressed their concerns about possible increases in monitor units (MUs). Treatments of patients with peripheral targets and isocentre located in the patient’s midline are of particular interest. The current work assessed the effect of JTT on these cases.
Methods:
JTT plans for thirty-two patients were compared to plans with the static jaws technique. The volumes of normal tissue receiving 5 Gy (V5), 10 Gy (V10) and 20 Gy (V20), mean dose (Dmean), target coverage parameters D95, D2% and Paddick’s conformity index (PCI) were compared. MUs were also registered for comparisons. The decrease in the jaws opening with JTT was correlated to the decrease in dose values in normal tissue.
Results:
Small decreases were observed in D95 and in D2% values, without statistical significance. A 5% average decrease in PCI values was noticed as well as significant decreases in V5, V10 and Dmean values, 9% on average. A 3% decrease in V20 was also observed. The number of MUs decreased by 2%. A significant correlation was found between the reduction of the secondary collimation opening areas and the dose delivered to normal tissue.
Conclusions:
JTT technique improved normal tissue protection in volumetric modulated arc therapy treatments for the patients included in the present study.
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Kollitz E, Roew M, Han H, Pinto M, Kamp F, Kim CH, Schwarz M, Belka C, Newhauser W, Parodi K, Dedes G. Applications of a patient-specific whole-body CT-mesh hybrid computational phantom in second cancer risk prediction. Phys Med Biol 2022; 67. [DOI: 10.1088/1361-6560/ac8851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 08/09/2022] [Indexed: 11/11/2022]
Abstract
Abstract
Objective. CT-mesh hybrid phantoms (or ‘hybrid(s)’) made from integrated patient CT data and mesh-type reference computational phantoms (MRCPs) can be beneficial for patient-specific whole-body dose evaluation, but this benefit has yet to be evaluated for second cancer risk prediction. The purpose of this study is to compare the hybrid’s ability to predict risk throughout the body with a patient-scaled MRCP against ground truth whole-body CTs (WBCTs). Approach. Head and neck active scanning proton treatment plans were created for and simulated on seven hybrids and the corresponding scaled MRCPs and WBCTs. Equivalent dose throughout the body was calculated and input into five second cancer risk models for both excess absolute and excess relative risk (EAR and ERR). The hybrid phantom was evaluated by comparing equivalent dose and risk predictions against the WBCT. Main results. The hybrid most frequently provides whole-body second cancer risk predictions which are closer to the ground truth when compared to a scaled MRCP alone. The performance of the hybrid relative to the scaled MRCP was consistent across ERR, EAR, and all risk models. For all in-field organs, where the hybrid shares the WBCT anatomy, the hybrid was better than or equal to the scaled MRCP for both equivalent dose and risk prediction. For out-of-field organs across all patients, the hybrid’s equivalent dose prediction was superior than the scaled MRCP in 48% of all comparisons, equivalent for 34%, and inferior for 18%. For risk assessment in the same organs, the hybrid’s prediction was superior than the scaled MRCP in 51.8% of all comparisons, equivalent in 28.6%, and inferior in 19.6%. Significance. Whole-body risk predictions from the CT-mesh hybrid have shown to be more accurate than those from a reference phantom alone. These hybrids could aid in risk-optimized treatment planning and individual risk assessment to minimize second cancer incidence.
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Hassan IM, Attalla EM, El-Gohary MI. Impact of 3D conformal and Intensity Modulated Radiotherapy on secondary cancer risk for patients with early prostate cancer. JOURNAL OF RADIATION RESEARCH AND APPLIED SCIENCES 2022. [DOI: 10.1016/j.jrras.2021.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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7
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Chargari C, Giraud P, Lacornerie T, Cosset JM. Prevention of radiation-induced cancers. Cancer Radiother 2021; 26:92-95. [PMID: 34953687 DOI: 10.1016/j.canrad.2021.09.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The issue of radiation-induced cancers must be taken into consideration during therapeutic irradiations. Risk factors for radiation-induced cancer include: the age of the patients, the volumes irradiated, the presence of risk cofactors and the exposure of critical organs. Those should be part of the therapeutic decision, in terms of indication, as well as choice of the radiotherapy technique (including repositioning systems). We present the update of the recommendations of the French society for radiation oncology on the modalities for preventing radiation-induced cancers.
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Affiliation(s)
- C Chargari
- Département d'oncologie radiothérapie, Gustave-Roussy Cancer Campus, 114, rue Édouard-Vaillant, 94800 Villejuif, France.
| | - P Giraud
- Département d'oncologie radiothérapie, hôpital européen Georges-Pompidou, université de Paris, 20, rue Leblanc, 75015 Paris, France
| | - T Lacornerie
- Service de physique médicale, centre Oscar-Lambret, 3, rue Frédéric-Combemale, 59000 Lille, France
| | - J-M Cosset
- Centre de radiothérapie Charlebourg/La Défense, groupe Amethyst, 65, avenue Foch, 92250 La Garenne-Colombes, France
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Fabian A, Krug D, Alkatout I. Radiotherapy and Its Intersections with Surgery in the Management of Localized Gynecological Malignancies: A Comprehensive Overview for Clinicians. J Clin Med 2020; 10:E93. [PMID: 33383960 PMCID: PMC7796321 DOI: 10.3390/jcm10010093] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Revised: 12/22/2020] [Accepted: 12/24/2020] [Indexed: 02/07/2023] Open
Abstract
Surgery, including minimally invasive surgery, and radiotherapy are key modalities in the treatment of gynecological malignancies. The aim of this review is to offer the multidisciplinary care team a comprehensive summary of the intersections of surgery and radiotherapy in the local treatment of gynecological malignancies. Recent advances in radiotherapy are highlighted. Relevant publications were identified through a review of the published literature. Ovarian, endometrial, cervical, vaginal, and vulvar cancer were included in the search. Current guidelines are summarized. The role of radiotherapy in adjuvant as well as definitive treatment of these entities is synthesized and put into context with surgery, focusing on survival and quality of life. Although these outcomes have improved recently, further research must be focused on the number of life years lost, and the potential morbidity encountered by patients.
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Affiliation(s)
- Alexander Fabian
- Department of Radiation Oncology, University Hospital of Schleswig-Holstein, Campus Kiel, Arnold-Heller-Str. 3, 24105 Kiel, Germany;
| | - David Krug
- Department of Radiation Oncology, University Hospital of Schleswig-Holstein, Campus Kiel, Arnold-Heller-Str. 3, 24105 Kiel, Germany;
| | - Ibrahim Alkatout
- Department of Obstetrics and Gynecology, University Hospital of Schleswig-Holstein, Campus Kiel, Arnold-Heller-Str. 3, 24105 Kiel, Germany
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Haciislamoglu E, Gungor G, Aydin G, Canyilmaz E, Guler OC, Zengin AY, Yenice KM. Estimation of secondary cancer risk after radiotherapy in high-risk prostate cancer patients with pelvic irradiation. J Appl Clin Med Phys 2020; 21:82-89. [PMID: 32671989 PMCID: PMC7497909 DOI: 10.1002/acm2.12972] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 05/13/2020] [Accepted: 06/22/2020] [Indexed: 12/21/2022] Open
Abstract
We aimed to estimate the risk of secondary cancer after radiotherapy (RT) in high‐risk prostate cancer (HRPC) patients with pelvic irradiation. Computed tomography data of five biopsy‐proven HRPC patients were selected for this study. Two different planning target volumes (PTV1 and PTV2) were contoured for each patient. The PTV1 included the prostate, seminal vesicles, and pelvic lymphatics, while the PTV2 included only the prostate and seminal vesicles. The prescribed dose was 54 Gy for the PTV1 with a sequential boost (24 Gy for the PTV2). Intensity‐modulated RT (IMRT) and volumetric modulated arc therapy (VMAT) techniques were used to generate treatment plans with 6 and 10 MV photon energies with the flattening filter (FF) or flattening filter‐free (FFF) irradiation mode. The excess absolute risks (EARs) were calculated and compared for the bladder, rectum, pelvic bone, and soft tissue based on the linear‐exponential, plateau, full mechanistic, and specific mechanistic sarcoma dose‐response model. According to the models, all treatment plans resulted in similar risks of secondary bladder or rectal cancer and pelvic bone or soft tissue sarcoma except for the estimated risk of the bladder according to the full mechanistic model using IMRT(6MV;FF) technique compared with VMAT techniques with FFF options. The overall estimation of EAR indicated that the radiation‐induced cancer risk due to RT in HRPC was lower for bladder than the rectum. EAR values ranged from 1.47 to 5.82 for bladder and 6.36 to 7.94 for rectum, depending on the dose–response models used. The absolute risks of the secondary pelvic bone and soft tissue sarcoma were small for the plans examined. We theoretically predicted the radiation‐induced secondary cancer risk in HRPC patients with pelvic irradiation. Nevertheless, prospective clinical trials, with larger patient cohorts with a long‐term follow‐up, are needed to validate these model predictions.
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Affiliation(s)
- Emel Haciislamoglu
- Department of Radiation Oncology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Gorkem Gungor
- Department of Radiation Oncology, Acibadem University, Istanbul, Turkey
| | - Gokhan Aydin
- Department of Radiation Oncology, Acibadem University, Istanbul, Turkey
| | - Emine Canyilmaz
- Department of Radiation Oncology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Ozan Cem Guler
- Department of Radiation Oncology, Faculty of Medicine, Baskent University, Adana, Turkey
| | - Ahmet Yasar Zengin
- Department of Radiation Oncology, Kanuni Research and Education Hospital, Trabzon, Turkey
| | - Kamil Mehmet Yenice
- Department of Radiation and Cellular Oncology, University of Chicago Medicine, Chicago, IL, USA
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Sohrabi M, Hakimi A. NOVEL 'PHOTONEUTRON VOLUME DOSE EQUIVALENT' HYPOTHESIS AND METHODOLOGY FOR SECOND PRIMARY CANCER RISK ESTIMATION IN HIGH-ENERGY X-RAY MEDICAL ACCELERATORS. RADIATION PROTECTION DOSIMETRY 2020; 188:432-443. [PMID: 31943095 DOI: 10.1093/rpd/ncz303] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 12/04/2019] [Accepted: 01/03/2020] [Indexed: 06/10/2023]
Abstract
A novel 'photoneutron (PN) volume dose equivalent' methodology was hypothesized and applied for the first time for estimating PN second primary cancer (PN-SPC) risks in high-energy X-ray medical accelerators. Novel position-sensitive mega-size polycarbonate dosimeters with 10B converter (with or without cadmium covers) were applied for determining fast, epithermal and thermal PN dose equivalents at positions on phantom surface and depths. The methodology was applied to sites of tumors such as brain, stomach and prostate in 47 patients. The PN-SPC risks were estimated for specific organs/tissues using linear International Commission on Radiological Protection cancer risks and were compared with some available data. The corresponding PN-SPC risk estimates ranged from 1.450 × 10-3 to 1.901 cases per 10 000 persons per Gray. The method was applied to 47 patients for estimating PN-SPC risks in patients undergoing radiotherapy. The PN-SPC risk estimates well match those calculated by simulation but are comparatively different from those estimated by 'PN point dose equivalent' methods, as expected.
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Affiliation(s)
- Mehdi Sohrabi
- Health Physics and Dosimetry Research Laboratory, Department of Energy Engineering and Physics, Amirkabir University of Technology, Tehran, Iran
| | - Amir Hakimi
- Health Physics and Dosimetry Research Laboratory, Department of Energy Engineering and Physics, Amirkabir University of Technology, Tehran, Iran
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11
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Xiang M, Chang DT, Pollom EL. Second cancer risk after primary cancer treatment with three-dimensional conformal, intensity-modulated, or proton beam radiation therapy. Cancer 2020; 126:3560-3568. [PMID: 32426866 DOI: 10.1002/cncr.32938] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 01/08/2020] [Accepted: 01/25/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND The comparative risks of a second cancer diagnosis are uncertain after primary cancer treatment with 3-dimensional conformal radiotherapy (3DCRT), intensity-modulated radiotherapy (IMRT), or proton beam radiotherapy (PBRT). METHODS Pediatric and adult patients with a first cancer diagnosis between 2004 and 2015 who received 3DCRT, IMRT, or PBRT were identified in the National Cancer Database from 9 tumor types: head and neck, gastrointestinal, gynecologic, lymphoma, lung, prostate, breast, bone/soft tissue, and brain/central nervous system. The diagnosis of second cancer was modeled using multivariable logistic regression adjusting for age, follow-up duration, radiotherapy (RT) dose, chemotherapy, sociodemographic variables, and other factors. Propensity score matching also was used to balance baseline characteristics. RESULTS In total, 450,373 patients were identified (33.5% received 3DCRT, 65.2% received IMRT, and 1.3% received PBRT) with median follow-up of 5.1 years after RT completion and a cumulative follow-up period of 2.54 million person-years. Overall, the incidence of second cancer diagnosis was 1.55 per 100 patient-years. In a comparison between IMRT versus 3DCRT, there was no overall difference in the risk of second cancer (adjusted odds ratio [OR], 1.00; 95% CI, 0.97-1.02; P = .75). By comparison, PBRT had an overall lower risk of second cancer versus IMRT (adjusted OR, 0.31; 95% CI, 0.26-0.36; P < .0001). Results within each tumor type generally were consistent in the pooled analyses and also were maintained in propensity score-matched analyses. CONCLUSIONS The risk of a second cancer diagnosis was similar after IMRT versus 3DCRT, whereas PBRT was associated with a lower risk of second cancer risk. Future work is warranted to determine the cost-effectiveness of PBRT and to identify the population best suited for this treatment.
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Affiliation(s)
- Michael Xiang
- Department of Radiation Oncology, Stanford University, Stanford, California, USA.,Palo Alto Veterans Affairs Hospital, Palo Alto, California, USA
| | - Daniel T Chang
- Department of Radiation Oncology, Stanford University, Stanford, California, USA
| | - Erqi L Pollom
- Department of Radiation Oncology, Stanford University, Stanford, California, USA.,Palo Alto Veterans Affairs Hospital, Palo Alto, California, USA
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12
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Zhang Q, Liu J, Ao N, Yu H, Peng Y, Ou L, Zhang S. Secondary cancer risk after radiation therapy for breast cancer with different radiotherapy techniques. Sci Rep 2020; 10:1220. [PMID: 31988348 PMCID: PMC6985127 DOI: 10.1038/s41598-020-58134-z] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 01/12/2020] [Indexed: 11/09/2022] Open
Abstract
The aim of this study was to estimate the radiation-related secondary cancer risks in organs during the treatment of breast cancer with different radiotherapy techniques, such as three-dimensional conformal radiotherapy (3D-CRT), intensity modulated radiotherapy (IMRT), and volumetric modulated arc therapy (VMAT). The treatment plans for 26 patients with breast cancer who received whole-breast irradiation at a dose of 50 Gy included tangential field 3D-CRT with hard-wedges (W-TF), tangential field IMRT (2F-IMRT), multiple field IMRT (6F-IMRT), and double partial arcs (VMAT). Patients were divided into three groups according to the distance between the contralateral breast (CB) and the body of the sternum. Setup error was simulated by moving the isocenter, and the dose distribution was then recalculated without changing the field fluency distribution. Based on the linear-exponential, the plateau, and the full mechanistic dose-response models, the organ equivalent dose and excess absolute risk were calculated from dose-volume histograms to estimate the secondary cancer risks in organs. Compared with 3D-CRT, IMRT and VMAT showed excellent results regarding tumor conformity and homogeneity; however, the low dose volume to organs was considerably higher in 6F-IMRT and VMAT. Secondary cancer risks for 2F-IMRT were comparable or slightly lower than for W-TF, but considerably lower than for 6F-IMRT or VMAT. After setup error simulation, there was a small increase in secondary cancer risk for 2F-IMRT and an increase of 159% and 318% for 6F-IMRT and VMAT, respectively, compared with W-TF. Although these results were obtained in most patients, they did not necessarily apply to every individual. The secondary cancer risks in the CB decreased significantly in correlation with increased distance for all alternative techniques, although they were higher in VMAT and lower in 2F-IMRT regardless of the distance. After setup error simulation, the increased changes in secondary cancer risks in the CB were comparable between 2F-IMRT, 6F-IMRT, and VMAT, suggesting that the secondary cancer risks in the CB mainly depend on radiotherapy techniques and distance, although the effect of setup error cannot be ignored. In the contralateral lung (CL), the secondary cancer risks were almost independent from distance and depended mainly on radiotherapy techniques; they were rarely affected by setup error. VMAT was associated with a higher secondary cancer risk in the CL. For the ipsilateral lung (IL), the secondary cancer risks were higher than those in other organs because the IL receives high doses to achieve tumor control, and they were relatively lower in VMAT. This warrants special consideration when estimating the secondary cancer risk to the IL. The study results suggested that the optimal radiotherapy method for breast cancer should be determined on an individual basis and according to the balance between secondary cancer risks related to anatomic diversity and setup error, which can prevent blind selection of techniques.
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Affiliation(s)
- Quanbin Zhang
- Radiotherapy center, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, China
| | - Jinbo Liu
- State Key Laboratory of Oncology in Southern China, Department of Radiology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Ningjian Ao
- Department of Biomedical Engineering, Jinan University, Guangzhou, China
| | - Hui Yu
- Radiotherapy center, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, China
| | - Yingying Peng
- Radiotherapy center, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, China
| | - Liya Ou
- Guangzhou Medical University, Guangzhou, China
| | - Shuxu Zhang
- Radiotherapy center, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, China.
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Dose verification of volumetric-modulated arc therapy using one-dimensional and two-dimensional dosimeters. JOURNAL OF RADIOTHERAPY IN PRACTICE 2019. [DOI: 10.1017/s1460396918000559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
AbstractPurposeTo verify dose delivery and quality assurance of volumetric-modulated arc therapy (VMAT) for head and neck (H&N) cancer.MethodThe Imaging and Radiation Oncology Core Houston (IROC-H) H&N phantom with thermoluminescent dosimeters (TLDs) and films, were imaged with computed tomography scan and the reconstructed image was transferred to pinnacle treatment planning system (TPS). On TPS, the planning target volume (PTV), secondary target volume (STV) and organ at risk (OAR) were delineated manually and a treatment plan was made. The dose constraints were determined for the concerned organs according to IROC-H prescription. The treatment plan was optimised using adoptive convolution algorithm to improve dose homogeneity and conformity. The dose calculation was performed using C.C Convolution algorithm and a Varian True Beam linear accelerator was used to deliver the treatment plan to the H&N phantom. The delivered radiation dose to the phantom was measured through TLDs and GafChromic external beam radiotherapy 2 (EBT2) films. The dosimetric performance of the VMAT delivery was studied by analysing percent dose difference, isodose line profile and gamma analysis of the TPS-computed dose and linac-delivered doses.ResultThe percent dose difference of 3.8% was observed between the planned and measured doses of TLDs and a 1.5-mm distance to agreement (DTA) was observed by comparing isodose line profiles. Passed the gamma criteria of 3%/3 mm was with good percentages.ConclusionThe dosimetric performance of VMAT delivery for a challenging H&N radiotherapy can be verified using TLDs and films embedded in an anthropomorphic H&N phantom.
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Jin X, Lin B, Chen D, Li L, Han C, Zhou Y, Zheng X, Gong C, Chen M, Xie C. Safety and outcomes of volumetric modulated arc therapy in the treatment of patients with inoperable lung cancer. J Cancer 2019; 10:2868-2873. [PMID: 31281463 PMCID: PMC6590029 DOI: 10.7150/jca.31260] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 04/14/2019] [Indexed: 12/19/2022] Open
Abstract
Background: Published data on the effects and toxicities of volumetric modulated arc therapy (VMAT) in the management of inoperable lung cancer are scarce. Materials and methods: The clinical outcomes and pulmonary toxicities of 134 patients with consecutive inoperable lung cancer who underwent VMAT from March 2011 to September 2016 were retrospectively reviewed. The dosimetric and characteristic factors associated with acute radiation pneumonitis (RP) and pulmonary fibrosis were evaluated with univariate and multivariate analysis. Results: The average prescription doses to these 134 patients were 57.07±6.27 Gy (range 52-64 Gy). The overall median follow-up time was 18.6 months (range, 2-45 mo), with a median follow-up time for the surviving patients of 20 months (range, 7-45 mo). The 2-year progression-free survival (PFS) and overall survival (OS) for all patients were 18.2% and 38.4%, with a median PFS and OS of 7.6 months and 18.6 months, respectively. The percent of patients with grade III/higher RP and pulmonary fibrosis were 10.5% and 9.0%, respectively. V13 (p=0.02) and age (p=0.02) were independently associated with acute RP according to multivariate analysis. The constraints for lung dosimetric metrics V10,V13,V20 and V30 were approximately 49%,41%,26% and 17% in VMAT treatment of lung cancer to limit the RP rate < 10%. Conclusion: VMAT can be delivered safely with acceptable acute and late toxicities for lung cancer patients. Lung dosimetric metrics were valuable in predicting acute RP. A lung V13 constraint of 40% was helpful to limit the RP rate < 10% in VMAT treatment of lung cancer patients.
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Affiliation(s)
- Xiance Jin
- Radiation and Medical Oncology, the first Affiliated Hospital of Wenzhou Medical University, Wenzhou, China,325000
| | - Baochai Lin
- Radiation and Medical Oncology, the first Affiliated Hospital of Wenzhou Medical University, Wenzhou, China,325000
| | - Didi Chen
- Radiation and Medical Oncology, the first Affiliated Hospital of Wenzhou Medical University, Wenzhou, China,325000
| | - Lili Li
- Radiation and Medical Oncology, the first Affiliated Hospital of Wenzhou Medical University, Wenzhou, China,325000
| | - Ce Han
- Radiation and Medical Oncology, the first Affiliated Hospital of Wenzhou Medical University, Wenzhou, China,325000
| | - Yongqiang Zhou
- Radiation and Medical Oncology, the first Affiliated Hospital of Wenzhou Medical University, Wenzhou, China,325000
| | - Xiaomin Zheng
- Radiation and Medical Oncology, the first Affiliated Hospital of Wenzhou Medical University, Wenzhou, China,325000
| | - Changfei Gong
- Radiation and Medical Oncology, the first Affiliated Hospital of Wenzhou Medical University, Wenzhou, China,325000
| | - Mengfeng Chen
- Respiratory Department, Third People's Hospital of Yueqing, Wenzhou, China, 325600
| | - Congying Xie
- Radiation and Medical Oncology, the first Affiliated Hospital of Wenzhou Medical University, Wenzhou, China,325000
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Correia D, Terribilini D, Zepter S, Pica A, Bizzocchi N, Volken W, Stieb S, Ahlhelm F, Herrmann E, Fix MK, Manser P, Aebersold DM, Weber DC. Whole-ventricular irradiation for intracranial germ cell tumors: Dosimetric comparison of pencil beam scanned protons, intensity-modulated radiotherapy and volumetric-modulated arc therapy. Clin Transl Radiat Oncol 2019; 15:53-61. [PMID: 30734001 PMCID: PMC6357692 DOI: 10.1016/j.ctro.2019.01.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 01/04/2019] [Accepted: 01/06/2019] [Indexed: 10/29/2022] Open
Abstract
Background Whole-ventricular radiotherapy (WV-RT) followed by a boost to the tumor bed (WV-RT/TB) is recommended for intracranial germ cell tumors (IGCT). As the critical brain areas are mainly in the target volume vicinity, it is unclear if protons indeed substantially spare neurofunctional organs at risk (NOAR). Therefore, a dosimetric comparison study of WV-RT/TB was conducted to assess whether proton or photon radiotherapy achieves better NOAR sparing. Methods Eleven children with GCT received 24 Gy(RBE) WV-RT and a boost up to 40 Gy(RBE) in 25 fractions of 1.6 Gy(RBE) with pencil beam scanning proton therapy (PBS-PT). Intensity-modulated radiotherapy (IMRT) and volumetric-modulated arc therapy (VMAT) plans were generated for these patients. NOAR were delineated and treatment plans were compared for target volume coverage (TVC), homogeneity index (HI), inhomogeneity coefficient (IC) and (N)OAR sparing. Results TVC was comparable for all three modalities. Compared to IMRT and VMAT, PBS-PT showed statistically significant optimized IC, as well as dose reduction, among others, in mean and integral dose to the: normal brain (-35.2%, -32.7%; -35.2%, -33.0%, respectively), cerebellum (-53.7%, -33.1%; -53.6%, -32.7%) and right temporal lobe (-14.5%, -31.9%; -14.7%, -29.9%). The Willis' circle was better protected with PBS-PT than IMRT (-7.1%; -7.8%). The left hippocampus sparing was higher with IMRT. Compared to VMAT, the dose to the hippocampi, amygdalae and temporal lobes was significantly decreased in the IMRT plans. Conclusions Dosimetric comparison of WV-RT/TB in IGCT suggests PBS-PT's advantage over photons in conformality and NOAR sparing, whereas IMRT's superiority over VMAT, thus potentially minimizing long-term sequelae.
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Affiliation(s)
- Dora Correia
- Center for Proton Therapy, Paul Scherrer Institute, ETH Domain, Villigen, Aargau, Switzerland.,Department of Radiation Oncology, Inselspital, Bern University Hospital, University of Bern, Switzerland
| | - Dario Terribilini
- Division of Medical Radiation Physics, Inselspital, Bern University Hospital, University of Bern, Switzerland
| | - Stefan Zepter
- Center for Proton Therapy, Paul Scherrer Institute, ETH Domain, Villigen, Aargau, Switzerland
| | - Alessia Pica
- Center for Proton Therapy, Paul Scherrer Institute, ETH Domain, Villigen, Aargau, Switzerland
| | - Nicola Bizzocchi
- Center for Proton Therapy, Paul Scherrer Institute, ETH Domain, Villigen, Aargau, Switzerland
| | - Werner Volken
- Division of Medical Radiation Physics, Inselspital, Bern University Hospital, University of Bern, Switzerland
| | - Sonja Stieb
- Department of Radiation Oncology, Inselspital, Bern University Hospital, University of Bern, Switzerland
| | - Frank Ahlhelm
- Department of Radiology, Cantonal Hospital Baden, Baden, Aargau, Switzerland
| | - Evelyn Herrmann
- Department of Radiation Oncology, Inselspital, Bern University Hospital, University of Bern, Switzerland
| | - Michael K Fix
- Division of Medical Radiation Physics, Inselspital, Bern University Hospital, University of Bern, Switzerland
| | - Peter Manser
- Division of Medical Radiation Physics, Inselspital, Bern University Hospital, University of Bern, Switzerland
| | - Daniel M Aebersold
- Department of Radiation Oncology, Inselspital, Bern University Hospital, University of Bern, Switzerland
| | - Damien C Weber
- Center for Proton Therapy, Paul Scherrer Institute, ETH Domain, Villigen, Aargau, Switzerland.,Department of Radiation Oncology, Inselspital, Bern University Hospital, University of Bern, Switzerland
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Bai W, Kou C, Yu W, Li Y, Hua W, Yu L, Wang J. Dosimetric comparison of volumetric-modulated arc therapy and intensity-modulated radiation therapy in patients with cervical cancer: a meta-analysis. Onco Targets Ther 2018; 11:7179-7186. [PMID: 30425510 PMCID: PMC6203086 DOI: 10.2147/ott.s178336] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Background Intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT) are two of the main treatment techniques for cervical cancer. Whether either technique significantly reduces irradiated volumes of organs at risk (OARs) remains controversial. The aim of this study was to explore which of these treatment paradigms is the superior technique in cervical treatment, taking clinical outcomes and treatment efficiency from published findings into consideration. Materials and methods PubMed, EMBASE, and Cochrane Library databases were utilized. The average percent irradiated volumes of OAR were extracted from all included studies. Dual arc results were extracted due to their superiority to single arc methods in terms of plan quality. Standard mean deviations and 95% CIs were calculated for delivery time, monitor units, and average percent irradiated volumes of OAR. Assessment of publication bias and sensitivity analyses were performed. All statistical analyses were conducted using R 3.5.0 software. Results Eight studies were included in this meta-analysis. For irradiated volumes of OARs, irradiated volume of rectum receiving 40 Gy (rectum V40) was significantly decreased in VMAT compared with IMRT. However, no significant differences were observed between IMRT and VMAT plans in bladder V40 or small bowel V40/V30. In addition, delivery times and monitor units were significantly lower in the VMAT plan than in the IMRT plan. Conclusion Compared with IMRT, VMAT is significantly more protective for the rectum, suggesting that it may be an optional therapy technique for patients with cervical cancer.
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Affiliation(s)
- Wei Bai
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun 130021, Jilin Province, China
| | - Changgui Kou
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun 130021, Jilin Province, China
| | - Weiying Yu
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun 130021, Jilin Province, China
| | - Yuanyuan Li
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun 130021, Jilin Province, China
| | - Wanqing Hua
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun 130021, Jilin Province, China
| | - Lei Yu
- Department of Radiotherapy, Second Hospital of Jilin University, Changchun 130041, Jilin Province, China,
| | - Jianfeng Wang
- Department of Radiotherapy, China-Japan Union Hospital, Changchun 130033, Jilin Province, China,
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Imaging Dose, Cancer Risk and Cost Analysis in Image-guided Radiotherapy of Cancers. Sci Rep 2018; 8:10076. [PMID: 29973695 PMCID: PMC6031630 DOI: 10.1038/s41598-018-28431-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Accepted: 06/19/2018] [Indexed: 02/05/2023] Open
Abstract
The purpose of this retrospective study is to evaluate the cumulative imaging doses, the associated cancer risk and the cost related to the various radiological imaging procedures in image-guided radiotherapy of cancers. Correlations between patients’ size and Monte Carlo simulated organ doses were established and validated for various imaging procedures, and then used for patient-specific organ dose estimation of 4,832 cancer patients. The associated cancer risk was estimated with published models and the cost was calculated based on the standard billing codes. The average (range) cumulative imaging doses to the brain, lungs and red bone marrow were 38.0 (0.5–177.3), 18.8 (0.4–246.5), and 49.1 (0.4–274.4) cGy, respectively. The associated average (range) lifetime attributable risk of cancer incidence per 100,000 persons was 78 (0–2798), 271 (1–8948), and 510 (0–4487) for brain cancer, lung cancer and leukemia, respectively. The median (range) imaging cost was $5256 (4268–15896) for the head scans, $5180 (4268–16274) for the thorax scans, and $7080 (4268–15288) for the pelvic scans, respectively. The image-guidance procedures and the accumulated imaging doses should be incorporated into clinical decision-making to personalize radiotherapy for individual patients.
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Fernández-Alvarez V, Fernández JA, Suárez Nieto C. Paragangliomas carotídeos: hacia un tratamiento personalizado que reduzca la morbilidad. ANGIOLOGIA 2017. [DOI: 10.1016/j.angio.2017.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Kry SF, Bednarz B, Howell RM, Dauer L, Followill D, Klein E, Paganetti H, Wang B, Wuu CS, George Xu X. AAPM TG 158: Measurement and calculation of doses outside the treated volume from external-beam radiation therapy. Med Phys 2017; 44:e391-e429. [DOI: 10.1002/mp.12462] [Citation(s) in RCA: 164] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 05/17/2017] [Accepted: 05/25/2017] [Indexed: 12/14/2022] Open
Affiliation(s)
- Stephen F. Kry
- Department of Radiation Physics; MD Anderson Cancer Center; Houston TX 77054 USA
| | - Bryan Bednarz
- Department of Medical Physics; University of Wisconsin; Madison WI 53705 USA
| | - Rebecca M. Howell
- Department of Radiation Physics; MD Anderson Cancer Center; Houston TX 77054 USA
| | - Larry Dauer
- Departments of Medical Physics/Radiology; Memorial Sloan-Kettering Cancer Center; New York NY 10065 USA
| | - David Followill
- Department of Radiation Physics; MD Anderson Cancer Center; Houston TX 77054 USA
| | - Eric Klein
- Department of Radiation Oncology; Washington University; Saint Louis MO 63110 USA
| | - Harald Paganetti
- Department of Radiation Oncology; Massachusetts General Hospital and Harvard Medical School; Boston MA 02114 USA
| | - Brian Wang
- Department of Radiation Oncology; University of Louisville; Louisville KY 40202 USA
| | - Cheng-Shie Wuu
- Department of Radiation Oncology; Columbia University; New York NY 10032 USA
| | - X. George Xu
- Department of Mechanical, Aerospace, and Nuclear Engineering; Rensselaer Polytechnic Institute; Troy NY 12180 USA
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Sakthivel V, Mani GK, Mani S, Boopathy R. Radiation-Induced Second Cancer Risk from External Beam Photon Radiotherapy for Head and Neck Cancer: Impact on in-Field and Out-of-Field Organs. Asian Pac J Cancer Prev 2017; 18:1897-1903. [PMID: 28749618 PMCID: PMC5648396 DOI: 10.22034/apjcp.2017.18.7.1897] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
The purpose of this paper is to provide data on development of second primary cancers within or adjacent to tissue irradiated in the treatment of primary head and neck cancers using different techniques and modalities. Materials and methods: We selected five patients with HandN tumors located in base of the tongue for risk assessment. In order to examine the impact of choices of various planning techniques, numbers of beams and beam energy used in treatment plans - 7 and 9 field Intensity modulated radiotherapy (IMRT) plans using 6MV and 10 MV beam energies and a 6MV Volumetric modulated arc therapy (VMAT) plans were planned. Out-of-field measurements for secondary photon doses for the treatment plans were measured using diode-dosimeters and solid water slabs. Differential dose-volume histograms (DVH) for all 5 patients and 5 techniques, were exported and used to calculate organ equivalent dose (OAR), excess absolute risk (EAR), and life-time attributable risk (LAR) for in-field organs. Results: For all treatment plans, the DVH showed clinically acceptable values; adequate clinical target coverage and dose constraints were met for all organs at risk. There was a clear advantage for the VMAT plan; it provided superior organ at risk (OAR) sparing and adequate target coverage. VMAT has relatively low monitor units at 0.93±0.034 times 7F6. The average percentage scattered to prescription doses for the five patients at 15, 30, 45, 60 and 75 cm from the isocenter were 0.9212 ± 0.115, 0.2621 ± 0.080, 0.1617 ± 0.057, 0.0936 ± 0.026, 0.0296 ± 0.014, for VMAT. Conclusion: Organ-specific LAR was higher with VMAT compared to 7F6 for skin. 6-MV VMAT is an acceptable alternative to IMRT for HandN cancer and offers advantages in terms of sparing adjacent OAR.
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Affiliation(s)
- Vasanthan Sakthivel
- Research and Development Centre, Bharathiar University, Coimbatore, India
- Advanced Medical Physics, Houston, Texas, United States.
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21
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Manem VSK, Kohandel M, Hodgson DC, Sivaloganathan S. Predictive modeling of therapy induced secondary thyroid malignancies in childhood cancer survivors. CONVERGENT SCIENCE PHYSICAL ONCOLOGY 2017. [DOI: 10.1088/2057-1739/aa7dec] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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22
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Radiation-induced biological changes of neural structures in the base of the skull tumours. JOURNAL OF RADIOTHERAPY IN PRACTICE 2017. [DOI: 10.1017/s1460396916000601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
AbstractBackground and purposeThe aim of this paper is to compare neural induced changes in three-dimensional conformal radiotherapy (3D-CRT) versus intensity modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) for nasopharyngeal cancers.Materials and methodsRadiotherapy plans for 10 patients with nasopharyngeal cancer stages III and IV were prospectively developed for 3D-CRT, IMRT and VMAT using Varian Eclipse planning system. The same radiation therapist carried out all planning and the same clinical dosimetric constraints were used. Normal tissue complication probabilities were calculated.ResultsThe mean planning target volume’s (PTVs) conformity index (CI) for 3D-CRT was 1·424, for IMRT 1·1, and for VMAT 1·081. The PTV homogeneity (HI) index was 0·204 for 3D-CRT, 0·124 for IMRT and 0·153 for VMAT. Normal tissue complication probabilities gave complex results for 3D-CRT, IMRT and VMAT and are analysed in detail in this paper. The mean monitor units were 95 (range 9–180) for 3D-CRT; 165 (range 52–277) for IMRT; and 331 (range 167–494) for VMAT (p<0·05).ConclusionsVMAT is associated with similar dosimetric advantages as IMRT over 3D-CRT for nasopharyngeal cancer. VMAT is associated with faster delivery times and greater number of mean monitor units than IMRT. Brain radionecrosis severity and risk, in the past, have been underestimated. By improving the life expectancy of patients with nasopharyngeal cancer to ensure maintenance of the neural structures, recommended dose limits should be considered as a first degree priority (as the spinal cord, brainstem, etc.) when IMRT and VMAT plans are implemented.
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Affiliation(s)
- Jun Deng
- Department of Therapeutic Radiology, Yale University, New Haven, Connecticut
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24
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Wang C, King CR, Kamrava M, Iwamoto KS, Chen AM, Low D, Kupelian PA, Steinberg ML. Pattern of solid and hematopoietic second malignancy after local therapy for prostate cancer. Radiother Oncol 2017; 123:133-138. [PMID: 28187996 DOI: 10.1016/j.radonc.2017.01.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2016] [Revised: 01/09/2017] [Accepted: 01/09/2017] [Indexed: 11/25/2022]
Abstract
BACKGROUND AND PURPOSE Second malignancies (SM) after external beam radiotherapy (EBRT) or brachytherapy (BT) for prostate cancer (PCa) are rare but serious sequelae. MATERIALS AND METHODS The Surveillance, Epidemiology, and End Results (SEER) database was used to identify men diagnosed with cT1-2N0M0 PCa between 1999 and 2005, who underwent EBRT, BT or radical prostatectomy (RP). Patients with time interval to second malignancy or follow-up shorter than five and two years were excluded for solid and hematopoietic SM analyses respectively. Risks for solid and hematopoietic SM were evaluated via the multivariate Fine and Gray proportional hazards model. RESULTS EBRT and BT resulted in similar increases in solid and hematopoietic SM compared to RP. In subgroup analysis stratified by treatment modality, only the EBRT cohort demonstrated significantly decreased solid and hematopoietic SM in years 2002-2005 compared to years 1999-2001, with adjusted-hazard ratios of 0.752 (p=0.001) and 0.815 (p=0.018) respectively. CONCLUSIONS EBRT and BT resulted in statistically equivalent increase in both solid and hematopoietic SM compared to RP. EBRT in more recent years resulted in significantly decreased solid and hematopoietic SM, coinciding with increased utilization of IMRT.
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Affiliation(s)
- Chenyang Wang
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA, United States.
| | - Christopher R King
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Mitchell Kamrava
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Keisuke S Iwamoto
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Allen M Chen
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Daniel Low
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Patrick A Kupelian
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Michael L Steinberg
- Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA, United States
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Chargari C, Goodman KA, Diallo I, Guy JB, Rancoule C, Cosset JM, Deutsch E, Magne N. Risk of second cancers in the era of modern radiation therapy: does the risk/benefit analysis overcome theoretical models? Cancer Metastasis Rev 2017; 35:277-88. [PMID: 26970966 DOI: 10.1007/s10555-016-9616-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
In the era of modern radiation therapy, the compromise between the reductions in deterministic radiation-induced toxicities through highly conformal devices may be impacting the stochastic risk of second malignancies. We reviewed the clinical literature and evolving theoretical models evaluating the impact of intensity-modulated radiation therapy (IMRT) on the risk of second cancers, as a consequence of the increase in volumes of normal tissues receiving low doses. The risk increase (if any) is not as high as theoretical models have predicted in adults. Moreover, the increase in out-of-field radiation doses with IMRT could be counterbalanced by the decrease in volumes receiving high doses. Clinical studies with short follow-up have not corroborated the hypothesis that IMRT would drastically increase the incidence of second cancers. In children, the risk of radiation-induced carcinogenesis increases from low doses and consequently the relative risk of second cancers after IMRT could be higher than in adults, justifying current developments of proton therapy with priority given to this population. Although only longer follow-up will allow a true assessment of the real impact of these modern techniques on radiation-induced carcinogenesis, a comprehensive risk-adapted strategy will help minimize the probability of second cancers.
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Affiliation(s)
- Cyrus Chargari
- Radiotherapy Department, Hôpital d'Instruction des Armées du Val-de-Grâce, Paris, France.,INSERM 1030, Molecular Radiotherapy, Gustave Roussy campus Cancer, Grand Paris, France
| | - Karyn A Goodman
- Department of Radiation Oncology, University of Colorado School of Medicine, Aurora, CO, USA
| | - Ibrahima Diallo
- U1018 Institut National de la Santé et de la Recherche Médicale, Villejuif, France
| | - Jean-Baptiste Guy
- Cellular and Molecular Radiotherapy Laboratory, EMR3738, 69921, Oullins, France.,Department of Radiotherapy, Lucien Neuwirth Cancer Institute, Saint Priest en Jarez, France
| | - Chloe Rancoule
- Department of Radiotherapy, Lucien Neuwirth Cancer Institute, Saint Priest en Jarez, France
| | - Jean-Marc Cosset
- Oncology/Radiotherapy Department, Institut Curie, 75005, Paris, France.,Charlebourg-La Défense Radiotherapy Center, Amethyst Group, La Garenne-Colombes, 92250, Paris, France
| | - Eric Deutsch
- INSERM 1030, Molecular Radiotherapy, Gustave Roussy campus Cancer, Grand Paris, France
| | - Nicolas Magne
- Cellular and Molecular Radiotherapy Laboratory, EMR3738, 69921, Oullins, France. .,Department of Radiotherapy, Lucien Neuwirth Cancer Institute, Saint Priest en Jarez, France. .,Chef du Département de Radiothérapie, Directeur de la Recherche et de l'Innovation, Institut de Cancérologie Lucien Neuwirth, 108 bis, avenue Albert Raimond, BP 60008, 42270, Saint-Priest en Jarez cedex, France.
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Han C, Schultheiss TE, Wong JYC. Estimation of radiation-induced secondary cancer risks for early-stage non-small cell lung cancer patients after stereotactic body radiation therapy. Pract Radiat Oncol 2017; 7:e185-e194. [PMID: 28089479 DOI: 10.1016/j.prro.2016.10.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 09/07/2016] [Accepted: 10/14/2016] [Indexed: 11/19/2022]
Abstract
PURPOSE In this study, we evaluated radiation-induced secondary lung cancer risks for the lung and the breast from stereotactic body radiation therapy treatment of early-stage non-small cell lung cancer with different radiation therapy treatment modalities. METHODS AND MATERIALS Ten patients (5 men and 5 women) with early-stage non-small cell lung cancer who received definitive stereotactic body radiation therapy treatments were retrospectively selected. For each patient, two 3-dimensional conformal radiation therapy (3D-CRT) plans using 6- and 10-MV photons, respectively; a helical tomotherapy (HT) plan; and 2 volumetric modulated arc therapy (VMAT) plans using 1 and 2 arcs, respectively, were generated. The excess absolute risk (EAR) for secondary cancer occurrence was calculated using 3 organ equivalent dose models: the linear-exponential model, the plateau model, and the linear model for prescription dose range of 30 to 70 Gy. RESULTS The 3D-CRT plans showed significantly lower monitor units compared with the rotational intensity modulate radiation therapy plans. Based on each of the 3 organ equivalent dose models, HT and VMAT plans showed comparable average EARs to both the lung and the breast compared with the 3D-CRT plans in the prescription dose range of 30 to 70 Gy. At a prescription dose of 50 Gy and using the linear-exponential model, the average lung EAR estimation ranged from 15.7 ± 5.3 to 16.0 ± 6.5 per 10,000 patients per year with the 5 delivery techniques, and the average EAR estimation for the breast ranged from 18.0 ± 14.0 to 21.0 ± 15.0 per 10,000 patients per year. The secondary cancer risk increased approximately linearly with mean organ dose. The 3D-CRT plans showed significantly higher secondary cancer risk for the ipsilateral lung and lower risk for the contralateral lung compared with the HT and VMAT plans. CONCLUSIONS Rotational intensity modulate radiation therapy techniques including helical tomotherapy and VMAT do not increase secondary cancer risks for the lung or the breast compared with 3D-CRT techniques, despite higher monitor units used.
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Affiliation(s)
- Chunhui Han
- Department of Radiation Oncology, City of Hope National Medical Center, Duarte, California.
| | - Timothy E Schultheiss
- Department of Radiation Oncology, City of Hope National Medical Center, Duarte, California
| | - Jeffrey Y C Wong
- Department of Radiation Oncology, City of Hope National Medical Center, Duarte, California
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Deng X, Han C, Chen S, Xie C, Yi J, Zhou Y, Zheng X, Deng Z, Jin X. Dosimetric benefits of intensity-modulated radiotherapy and volumetric-modulated arc therapy in the treatment of postoperative cervical cancer patients. J Appl Clin Med Phys 2016; 18:25-31. [PMID: 28291936 PMCID: PMC5689869 DOI: 10.1002/acm2.12003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 09/06/2016] [Indexed: 12/02/2022] Open
Abstract
As the advantage of using complex volumetric‐modulated arc therapy (VMAT) in the treatment of gynecologic cancer has not yet been fully determined, the purpose of this study was to investigate the dosimetric advantages of VMAT by comparing directly with whole pelvic conformal radiotherapy (CRT) and intensity‐modulated radiotherapy (IMRT) in the treatment of 15 postoperative cervical cancer patients. Four‐field CRT, seven‐field IMRT, and two‐arc VMAT plans were generated for each patient with identical objective functions to achieve clinically acceptable dose distribution. Target coverage and OAR sparing differences were investigated through dose‐volume histogram (DVH) analysis. Nondosimtric differences between IMRT and VMAT were also compared. Target coverage presented by V95% were 88.9% ± 3.8%, 99.9% ± 0.07%, and 99.9% ± 0.1% for CRT, IMRT, and VMAT, respectively. Significant differences on conformal index (CI) and conformal number (CN) were observed with CIs of 0.37 ± 0.07, 0.55 ± 0.04, 0.61 ± 0.04, and CNs of 0.33 ± 0.06, 0.55 ± 0.04, 0.60 ± 0.04 for CRT, IMRT, and VMAT, respectively. IMRT and VMAT decreased the dose to bladder and rectum significantly compared with CRT. No significant differences on the Dmean, V45, and V30 of small bowel were observed among CRT, IMRT, and VMAT. However, VMAT (10.4 ± 4.8 vs. 19.8 ± 11.0, P = 0.004) and IMRT (12.3 ± 5.0 vs. 19.8 ± 11.0, P = 0.02) decreased V40, increased the Dmax of small bowel and the irradiation dose to femoral heads compared with CRT. VMAT irradiated less dose to bladder, rectum, small bowel and larger volume of health tissue with a lower dose (V5 and V10) compared with IMRT, although the differences were not statistical significant. In conclusion, VMAT and IMRT showed significant dosimetric advantages both on target coverage and OAR sparing compared with CRT in the treatment of postoperative cervical cancer. However, no significant difference between IMRT and VMAT was observed except for slightly better dose conformity, slightly less MU, and significant shorter delivery time achieved for VMAT.
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Affiliation(s)
- Xia Deng
- Radiotherapy and Chemotherapy Department, the 1st Affiliated Hospital of Wenhzou Medical University, Wenzhou, China
| | - Ce Han
- Radiotherapy and Chemotherapy Department, the 1st Affiliated Hospital of Wenhzou Medical University, Wenzhou, China
| | - Shan Chen
- Department of Clinical Solutions Support, Elekta Instrument (Shanghai) Ltd., Shanghai, China
| | - Congying Xie
- Radiotherapy and Chemotherapy Department, the 1st Affiliated Hospital of Wenhzou Medical University, Wenzhou, China
| | - Jinling Yi
- Radiotherapy and Chemotherapy Department, the 1st Affiliated Hospital of Wenhzou Medical University, Wenzhou, China
| | - Yongqiang Zhou
- Radiotherapy and Chemotherapy Department, the 1st Affiliated Hospital of Wenhzou Medical University, Wenzhou, China
| | - Xiaomin Zheng
- Radiotherapy and Chemotherapy Department, the 1st Affiliated Hospital of Wenhzou Medical University, Wenzhou, China
| | - Zhenxiang Deng
- Radiotherapy and Chemotherapy Department, the 1st Affiliated Hospital of Wenhzou Medical University, Wenzhou, China
| | - Xiance Jin
- Radiotherapy and Chemotherapy Department, the 1st Affiliated Hospital of Wenhzou Medical University, Wenzhou, China
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Budgell G, Brown K, Cashmore J, Duane S, Frame J, Hardy M, Paynter D, Thomas R. IPEM topical report 1: guidance on implementing flattening filter free (FFF) radiotherapy. Phys Med Biol 2016; 61:8360-8394. [DOI: 10.1088/0031-9155/61/23/8360] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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A combined single high-dose rate brachytherapy boost with hypofractionated external beam radiotherapy results in a high rate of biochemical disease free survival in localised intermediate and high risk prostate cancer patients. Radiother Oncol 2016; 121:299-303. [DOI: 10.1016/j.radonc.2016.09.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 09/19/2016] [Accepted: 09/19/2016] [Indexed: 11/21/2022]
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Cosset JM, Chargari C, Demoor C, Giraud P, Helfre S, Mornex F, Mazal A. [Prevention of radio-induced cancers]. Cancer Radiother 2016; 20 Suppl:S61-8. [PMID: 27523416 DOI: 10.1016/j.canrad.2016.07.030] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The article deals with the prevention of cancers only directly related to therapeutic radiation which are distinguished from "secondary cancer". The consideration of the risk of radiation-induced cancers after radiation therapy, although it is fortunately rare events, has become indispensable today. With a review of the literature, are detailed the various involved parameters. The age of the irradiated patient is one of the main parameters. The impact of the dose is also discussed based on the model used, and based on clinical data. Other parameters defining a radiation treatment are discussed one after the other: field with the example of Hodgkin's disease, the type of radiation and the participation of secondary neutrons, spreading and splitting. All these parameters are discussed according to each organ whose sensitivity is different. The article concludes with a list of recommendations to reduce the risk of radio-induced cancers. Even with the advent of conformal radiotherapy, intensity modulation, the modulated volume arctherapy, and the development of specific machinery for the extra-cranial stereotactic, the radiation therapist must consider this risk and use of reasonable and justified control imaging. Although they constitute a small percentage of cancers that occur secondarily after a first malignant tumor, radiation-induced cancers, can not and must not be concealed or ignored and justify regular monitoring over the long term, precisely adapted on the described parameters.
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Affiliation(s)
- J-M Cosset
- Département d'oncologie/radiothérapie, institut Curie, 26, rue d'Ulm, 75005 Paris, France.
| | - C Chargari
- Service de curiethérapie, institut Gustave-Roussy, 114, rue Édouard-Vaillant, 94800 Villejuif, France; Institut de recherche biomédicale des armées, 91223 Brétigny-sur-Orge, France
| | - C Demoor
- Département de radiothérapie, institut de cancérologie de l'Ouest, boulevard J.-Monod, 44800 Saint-Herblain, Nantes, France; Unité Inserm 1018, 114, rue Édouard-Vaillant, 94805 Villejuif, France
| | - P Giraud
- Hôpital européen Georges-Pompidou, université Paris-Descartes, Paris-Cité Sorbonne, 20, rue Leblanc, 75015 Paris, France
| | - S Helfre
- Département d'oncologie/radiothérapie, institut Curie, 26, rue d'Ulm, 75005 Paris, France
| | - F Mornex
- Département d'oncologie radiothérapie, centre hospitalier Lyon-Sud, 165, chemin du Grand-Revoyet, 69310 Pierre-Bénite, Lyon, France
| | - A Mazal
- Département d'oncologie/radiothérapie, institut Curie, 26, rue d'Ulm, 75005 Paris, France
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McQuaid D, Dunlop A, Nill S, Franzese C, Nutting CM, Harrington KJ, Newbold KL, Bhide SA. Evaluation of radiotherapy techniques for radical treatment of lateralised oropharyngeal cancers : Dosimetry and NTCP. Strahlenther Onkol 2016; 192:516-25. [PMID: 27295511 DOI: 10.1007/s00066-016-0980-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 04/12/2016] [Indexed: 12/22/2022]
Abstract
AIM The aim of this study was to investigate potential advantages and disadvantages of three-dimensional conformal radiotherapy (3DCRT), multiple fixed-field intensity-modulated radiotherapy (IMRT) and volumetric-modulated arc therapy (VMAT) in terms of dose to the planning target volume (PTV), organs at risk (OARs) and normal tissue complication probability (NTCP) for delivering ipsilateral radiotherapy. MATERIALS AND METHODS 3DCRT, IMRT and VMAT were compared in patients with well-lateralised primary tonsillar cancers who underwent primary radical ipsilateral radiotherapy. The following parameters were compared: conformity index (CI); homogeneity index (HI); dose-volume histograms (DVHs) of PTVs and OARs; NTCP, risk of radiation-induced cancer and dose accumulation during treatment. RESULTS IMRT and VMAT were superior to 3DCRT in terms of CI, HI and dose to the target volumes, as well as mandible and dose accumulation robustness. The techniques were equivalent in terms of dose and NTCP for the contralateral oral cavity, contralateral submandibular gland and mandible, when specific dose constraint objectives were used on the oral cavity volume. Although the volume of normal tissue exposed to low-dose radiation was significantly higher with IMRT and VMAT, the risk of radiation-induced secondary malignancy was dependant on the mathematical model used. CONCLUSION This study demonstrates the superiority of IMRT/VMAT techniques over 3DCRT in terms of dose homogeneity, conformity and consistent dose delivery to the PTV throughout the course of treatment in patients with lateralised oropharyngeal cancers. Dosimetry and NTCP calculations show that these techniques are equivalent to 3DCRT with regard to the risk of acute mucositis when specific dose constraint objectives were used on the contralateral oral cavity OAR.
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Affiliation(s)
- D McQuaid
- Head and Neck Unit, Royal Marsden Hospital, Downs road, SM2 5PT, Sutton, Surrey, UK
- Head and Neck Unit, Royal Marsden Hospital, SW3 6JJ, London, UK
- The Institute of Cancer Research, SW3 6JB, London, UK
- The Institute of Cancer Research, SM2 5NG, Sutton, UK
| | - A Dunlop
- Head and Neck Unit, Royal Marsden Hospital, Downs road, SM2 5PT, Sutton, Surrey, UK
- Head and Neck Unit, Royal Marsden Hospital, SW3 6JJ, London, UK
- The Institute of Cancer Research, SW3 6JB, London, UK
- The Institute of Cancer Research, SM2 5NG, Sutton, UK
| | - S Nill
- Head and Neck Unit, Royal Marsden Hospital, Downs road, SM2 5PT, Sutton, Surrey, UK
- Head and Neck Unit, Royal Marsden Hospital, SW3 6JJ, London, UK
- The Institute of Cancer Research, SW3 6JB, London, UK
- The Institute of Cancer Research, SM2 5NG, Sutton, UK
| | - C Franzese
- Head and Neck Unit, Royal Marsden Hospital, Downs road, SM2 5PT, Sutton, Surrey, UK
- Head and Neck Unit, Royal Marsden Hospital, SW3 6JJ, London, UK
| | - C M Nutting
- Head and Neck Unit, Royal Marsden Hospital, Downs road, SM2 5PT, Sutton, Surrey, UK
- Head and Neck Unit, Royal Marsden Hospital, SW3 6JJ, London, UK
- The Institute of Cancer Research, SW3 6JB, London, UK
- The Institute of Cancer Research, SM2 5NG, Sutton, UK
| | - K J Harrington
- Head and Neck Unit, Royal Marsden Hospital, Downs road, SM2 5PT, Sutton, Surrey, UK
- Head and Neck Unit, Royal Marsden Hospital, SW3 6JJ, London, UK
- The Institute of Cancer Research, SW3 6JB, London, UK
- The Institute of Cancer Research, SM2 5NG, Sutton, UK
| | - K L Newbold
- Head and Neck Unit, Royal Marsden Hospital, Downs road, SM2 5PT, Sutton, Surrey, UK
- Head and Neck Unit, Royal Marsden Hospital, SW3 6JJ, London, UK
- The Institute of Cancer Research, SW3 6JB, London, UK
- The Institute of Cancer Research, SM2 5NG, Sutton, UK
| | - S A Bhide
- Head and Neck Unit, Royal Marsden Hospital, Downs road, SM2 5PT, Sutton, Surrey, UK.
- Head and Neck Unit, Royal Marsden Hospital, SW3 6JJ, London, UK.
- The Institute of Cancer Research, SW3 6JB, London, UK.
- The Institute of Cancer Research, SM2 5NG, Sutton, UK.
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Yu J, Hu T, Chen Y. Small-arc volumetric-modulated arc therapy: A new approach that is superior to fixed-field IMRT in optimizing dosimetric and treatment-relevant parameters for patients undergoing whole-breast irradiation following breast-conserving surgery. Medicine (Baltimore) 2016; 95:e4609. [PMID: 27559956 PMCID: PMC5400323 DOI: 10.1097/md.0000000000004609] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Volumetric-modulated arc therapy (VMAT) is considered to deliver a better dose distribution and to shorten treatment time. There is a lack of research regarding breast irradiation after breast-conserving surgery (BCS) using VMAT with prone positioning. We developed a new small-arc VMAT methodology and compared it to conventional (fixed-field) intensity-modulated radiation therapy (IMRT) in the dosimetric and treatment relevant parameters for breast cancer patients in the prone position.Ten early-stage breast cancer patients were included in this exploratory study. All patients underwent computed tomography (CT) simulation scan in the prone position and for each patient, IMRT and VMAT plans were generated using the Monaco planning system. Two symmetrical partial arcs were applied in the VMAT plans. The angle ranges of the 2 arcs were set to approximately 60° to 100° and 220° to 260°, with small adjustments to maximize target coverage, while minimizing lung and heart exposure. The IMRT plans used 4 fixed fields. Prescribed doses were 50 Gy in 25 fractions. The target coverage, homogeneity, conformity, dose to organs at risk (OAR), treatment time, and monitor units (MU) were evaluated.Higher median conformal index (CI) and lower homogeneity index (HI) of the planning target volume (PTV) were respectively observed in VMAT and plans group (CI, 95% vs 91%; HI, 0.09 vs 0.12; P < 0.001). The volumes of ipsilateral lung receiving 30, 20, 10, and 5 Gy were lower for VMAT (P < 0.01), being 10%, 14.9%, 25.9%, and 44.9%, respectively, compared to 11.79%, 17.32%, 30.27%, and 50.58% for the IMRT plans. The mean lung dose was also reduced from 10.6 ± 1.8 to 9.6 ± 1.4 Gy (P = 0.001). The volumes of the heart receiving 30 and 40 Gy were similar for the 2 methods. In addition, the median treatment time (161 vs 412 seconds; P < 0.001) and the mean MU (713 vs 878; P < 0.001) were lower for VMAT.Small-arc VMAT plan improved CI and HI for the target, spared the dose of lung, and reduced treatment time and MU, compared to IMRT. It is a more promising irradiation technique for post-BCS radiotherapy.
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Affiliation(s)
- Jing Yu
- Department of Radiation Oncology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, P.R. China
| | - Tao Hu
- Department of Oncology, the Central Hospital of Wuhan
| | - Yeshan Chen
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
- Correspondence: Yeshan Chen, Cancer Center, Union Hospital, Tongji Medical College, Huazhong, University of Science and Technology, Wujiadun Road 156, Wuhan 430022, P.R. China (e-mail: )
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Yu T, Zhang Q, Zheng T, Shi H, Liu Y, Feng S, Hao M, Ye L, Wu X, Yang C. The Effectiveness of Intensity Modulated Radiation Therapy versus Three-Dimensional Radiation Therapy in Prostate Cancer: A Meta-Analysis of the Literatures. PLoS One 2016; 11:e0154499. [PMID: 27171271 PMCID: PMC4865138 DOI: 10.1371/journal.pone.0154499] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 04/14/2016] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND AND PURPOSE Intensity modulated radiation therapy (IMRT) can deliver higher doses with less damage of healthy tissues compared with three-dimensional radiation therapy (3DCRT). However, for the scenarios with better clinical outcomes for IMRT than 3DCRT in prostate cancer, the results remain ambiguous. We performed a meta-analysis to assess whether IMRT can provide better clinical outcomes in comparison with 3DCRT in patients diagnosed with prostate cancer. MATERIALS AND METHODS We conducted a meta-analysis of 23 studies (n = 9556) comparing the clinical outcomes, including gastrointestinal (GI) toxicity, genitourinary (GU) toxicity, biochemical controland overall survival (OS). RESULTS IMRT was significantly associated with decreased 2-4 grade acute GI toxicity [risk ratio (RR) = 0.59 (95% confidence interval (CI), 0.44, 0.78)], late GI toxicity [RR = 0.54, 95%CI (0.38, 0.78)], late rectal bleeding [RR = 0.48, 95%CI (0.27, 0.85)], and achieved better biochemical control[RR = 1.17, 95%CI (1.08, 1.27)] in comparison with 3DCRT. IMRT and 3DCRT remain the same in regard of grade 2-4 acute rectal toxicity [RR = 1.03, 95%CI (0.45, 2.36)], late GU toxicity [RR = 1.03, 95%CI (0.82, 1.30)] and overall survival [RR = 1.07, 95%CI (0.96, 1.19)], while IMRT slightly increased the morbidity of grade 2-4 acute GU toxicity [RR = 1.08, 95%CI (1.00, 1.17)]. CONCLUSIONS Although some bias cannot be ignored, IMRT appears to be a better choice for the treatment of prostate cancer when compared with 3DCRT.
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Affiliation(s)
- Ting Yu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, PRC
| | - Qiongwen Zhang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, PRC
- State Key Laboratory of Biotherapy and Department of Head and Neck Oncology, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, PRC
| | - Tianying Zheng
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, PRC
| | - Huashan Shi
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, PRC
- State Key Laboratory of Biotherapy and Department of Head and Neck Oncology, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, PRC
| | - Yang Liu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, PRC
| | - Shijian Feng
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, PRC
| | - Meiqin Hao
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, PRC
| | - Lei Ye
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, PRC
| | - Xueqian Wu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, PRC
| | - Cheng Yang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, PRC
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Brain dose-sparing radiotherapy techniques for localized intracranial germinoma: Case report and literature review of modern irradiation. Cancer Radiother 2016; 20:210-6. [DOI: 10.1016/j.canrad.2016.02.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 02/05/2016] [Accepted: 02/13/2016] [Indexed: 12/26/2022]
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Pediatric craniospinal irradiation with conventional technique or helical tomotherapy: impact of age and body volume on integral dose. TUMORI JOURNAL 2016; 102:387-92. [PMID: 27056336 DOI: 10.5301/tj.5000512] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/22/2016] [Indexed: 11/20/2022]
Abstract
PURPOSE The use of helical tomotherapy (HT) for craniospinal irradiation (CSI) in pediatric patients remains an issue of discussion. In this study, we evaluated the integral dose (ID) to organs at risk (OARs) and to the whole body delivered with conventional 3-dimensional conformal radiotherapy (3D-CRT) and HT for pediatric patients and made a comparison according to different whole body volumes. METHODS We selected 10 pediatric patients with different body volumes and of different ages undergoing CSI. Plans for 3D-CRT and HT were developed for each patient. The ID to OARs and to the whole body were compared and statistical analyses were performed to determine differences. RESULTS We noticed that variations of ID depend on the different anatomical location of the organs relatively to the target, with lower ID to OARs opposed to the target and increased ID to lateral organs: ID tomotherapy/3D-CRT ratio was higher in lungs, kidneys, and mammary region, while it was lower in heart, liver, thyroid, and esophagus. The ID of the body increased with large volumes both in HT and in 3D-CRT plans, but in tomotherapy plans ID increased significantly more with large volumes than with small ones. CONCLUSIONS While there are no differences in using tomotherapy or 3D-CRT with small body volumes, we found a difference with large volumes (≥20,000 mL vs ≤20,000 mL). Therefore, for very small patients, the use of intensity-modulated radiotherapy provided with tomotherapy to reduce the dose to OARs can be reconsidered.
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Liu J, Ng D, Lee J, Stalley P, Hong A. Chest wall desmoid tumours treated with definitive radiotherapy: a plan comparison of 3D conformal radiotherapy, intensity-modulated radiotherapy and volumetric-modulated arc radiotherapy. Radiat Oncol 2016; 11:34. [PMID: 26935470 PMCID: PMC4776360 DOI: 10.1186/s13014-016-0611-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 02/25/2016] [Indexed: 11/10/2022] Open
Abstract
Purpose Definitive radiotherapy is often used for chest wall desmoid tumours due to size or anatomical location. The delivery of radiotherapy is challenging due to the large size and constraints of normal surrounding structures. We compared the dosimetry of 3D conformal radiotherapy (3DCRT), intensity-modulated radiotherapy (IMRT) and volumetric-modulated arc radiotherapy (VMAT) to evaluate the best treatment option. Methods and materials Ten consecutive patients with inoperable chest wall desmoid tumours (PTV range 416–4549 cm3) were selected. For each patient, 3DCRT, IMRT and VMAT plans were generated and the Conformity Index (CI), organ at risk (OAR) doses and monitor unit (MU) were evaluated. The Wilcoxon signed-rank test was used to compare dose delivered to both target and OARs. Results The mean number of fields for 3DCRT and IMRT were 6.3 ± 2.1, 7.2 ± 1.8. The mean number of arcs for VMAT was 3.7 ± 1.1. The mean conformity index of VMAT (0.98 ± 0.14) was similar to that of IMRT (1.03 ± 0.13), both of which were significantly better than 3DCRT (1.35 ± 0.20; p = 0.005). The mean dose to lung was significantly higher for 3DCRT (11.9Gy ± 7.9) compared to IMRT (9.4Gy ± 5.4, p = 0.014) and VMAT (8.9Gy ± 4.5, p = 0.017). For the 3 females, the low dose regions in the ipsilateral breast for VMAT were generally less with VMAT. IMRT plans required 1427 ± 532 MU per fraction which was almost 4-fold higher than 3DCRT (313 ± 112, P = 0.005). Compared to IMRT, VMAT plans required 60 % less MU (570 ± 285, P = 0.005). Conclusions For inoperable chest wall desmoid tumours, VMAT delivered equivalent target coverage when compared to IMRT but required 60 % less MU. Both VMAT and IMRT were superior to 3DCRT in terms of better PTV coverage and sparing of lung tissue.
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Affiliation(s)
- Jia Liu
- Central Clinical School, Faculty of Medicine, University of Sydney, Camperdown, NSW, Australia.
| | - Diana Ng
- Department of Radiation Oncology, Mater Hospital, Genesis Cancer Care, St Leonards, NSW, Australia.
| | - James Lee
- Department of Radiation Oncology, Mater Hospital, Genesis Cancer Care, St Leonards, NSW, Australia.
| | - Paul Stalley
- Central Clinical School, Faculty of Medicine, University of Sydney, Camperdown, NSW, Australia. .,Bone and Soft Tissue Sarcoma Unit, Royal Prince Alfred Hospital, Camperdown, NSW, Australia.
| | - Angela Hong
- Central Clinical School, Faculty of Medicine, University of Sydney, Camperdown, NSW, Australia.
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Cakir A, Akgun Z, Fayda M, Agaoglu F. Comparison of three dimensional conformal radiation therapy, intensity modulated radiation therapy and volumetric modulated arc therapy for low radiation exposure of normal tissue in patients with prostate cancer. Asian Pac J Cancer Prev 2016; 16:3365-70. [PMID: 25921146 DOI: 10.7314/apjcp.2015.16.8.3365] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Radiotherapy has an important role in the treatment of prostate cancer. Three-dimensional conformal radiation therapy (3D-CRT), intensity modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) techniques are all applied for this purpose. However, the risk of secondary radiation-induced bladder cancer is significantly elevated in irradiated patients compared surgery-only or watchful waiting groups. There are also reports of risk of secondary cancer with low doses to normal tissues. This study was designed to compare received volumes of low doses among 3D-CRT, IMRT and VMAT techniques for prostate patients. Ten prostate cancer patients were selected retrospectively for this planning study. Treatment plans were generated using 3D-CRT, IMRT and VMAT techniques. Conformity index (CI), homogenity index (HI), receiving 5 Gy of the volume (V5%), receiving 2 Gy of the volume (V2%), receiving 1 Gy of the volume (V1%) and monitor units (MUs) were compared. This study confirms that VMAT has slightly better CI while thev olume of low doses was higher. VMAT had lower MUs than IMRT. 3D-CRT had the lowest MU, CI and HI. If target coverage and normal tissue sparing are comparable between different treatment techniques, the risk of second malignancy should be a important factor in the selection of treatment.
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Affiliation(s)
- Aydin Cakir
- Department of Radiation Oncology, Oncology Institute, Istanbul University, Istanbul, Turkey E-mail :
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Bezak E, Takam R, Marcu LG. Peripheral photon and neutron doses from prostate cancer external beam irradiation. RADIATION PROTECTION DOSIMETRY 2015; 167:591-601. [PMID: 25564673 DOI: 10.1093/rpd/ncu362] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Accepted: 11/28/2014] [Indexed: 06/04/2023]
Abstract
Peripheral photon and neutron doses from external beam radiotherapy (EBRT) are associated with increased risk of carcinogenesis in the out-of-field organs; thus, dose estimations of secondary radiation are imperative. Peripheral photon and neutron doses from EBRT of prostate carcinoma were measured in Rando phantom. (6)LiF:Mg,Cu,P and (7)LiF:Mg,Cu,P glass-rod thermoluminescence dosemeters (TLDs) were inserted in slices of a Rando phantom followed by exposure to 80 Gy with 18-MV photon four-field 3D-CRT technique. The TLDs were calibrated using 6- and 18-MV X-ray beam. Neutron dose equivalents measured with CR-39 etch-track detectors were used to derive readout-to-neutron dose conversion factor for (6)LiF:Mg,Cu,P TLDs. Average neutron dose equivalents per 1 Gy of isocentre dose were 3.8±0.9 mSv Gy(-1) for thyroid and 7.0±5.4 mSv Gy(-1) for colon. For photons, the average dose equivalents per 1 Gy of isocentre dose were 0.2±0.1 mSv Gy(-1) for thyroid and 8.1±9.7 mSv Gy(-1) for colon. Paired (6)LiF:Mg,Cu,P and (7)LiF:Mg,Cu,P TLDs can be used to measure photon and neutron doses simultaneously. Organs in close proximity to target received larger doses from photons than those from neutrons whereas distally located organs received higher neutron versus photon dose.
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Affiliation(s)
- Eva Bezak
- Department of Medical Physics, Royal Adelaide Hospital, Adelaide, Australia School of Chemistry and Physics, Adelaide University, Adelaide, Australia
| | - Rundgham Takam
- Department of Medical Physics, Royal Adelaide Hospital, Adelaide, Australia School of Chemistry and Physics, Adelaide University, Adelaide, Australia
| | - Loredana G Marcu
- Department of Medical Physics, Royal Adelaide Hospital, Adelaide, Australia School of Chemistry and Physics, Adelaide University, Adelaide, Australia Faculty of Science, University of Oradea, Oradea 410087, Romania
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Calandrino R, Perna L, Belli ML, Botti A, Cattaneo M, Fiorino C, Cozzarini C, Iori M. Second Tumor Induction Risk in IMRT for Prostate Cancer: An Unbalanced Comparison Between Surgery and Radiotherapy? HEALTH PHYSICS 2015; 109:549-555. [PMID: 26509622 DOI: 10.1097/hp.0000000000000362] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The aim of this study was to evaluate the risk of second tumor induction for prostate patients treated with volumetric modulated arc therapy in age classes 50-70. Based on both age-dependent models and doses to critical organs, the risk of second tumor induction was evaluated simulating the small field (prostate and seminal vesicles) and large field (whole pelvis) for Helical Tomotherapy and Rapid Arc. The doses to the organs closest to the treatment volume were derived from treatment planning system data. Whereas, due to the lack of calculation algorithms where leakage and internal radiation scattering are unreliable at a large distance from target, the doses to the organs outside the treatment volume were measured in an anthropomorphic phantom. Doses from Image Guided Radiotherapy (IGRT) were also assessed on phantom measurements. The Lifetime Attributable Risk (LAR) for second tumor induction increases from 2.2 to 13.7% as irradiated volume increases and age decreases. IGRT could add a non-negligible factor to the risk when daily set-up verification with high-resolution modality is included. As prostate cancer is detected earlier, the probability of an increase in early stage patients rises, and life expectancy thus increases. Radiotherapy has improved its capability in the tailoring of the dose around the target at the cost of a greater dose to surrounding organs, thus increasing the risk of second tumor induction, especially for those patients expected to survive 15 y or more.
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Affiliation(s)
- Riccardo Calandrino
- *Medical Physics Department, IRCCS San Raffaele Scientific Institute, Milan Italy; †Medical Physics Department, IRCCS Arcispedale Santa Maria Nuova-IRCCS, Reggio Emilia, Italy; ‡Radiotherapy Department, IRCCS San Raffaele Scientific Institute, Milan Italy
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Liu X, Yang Y, Jin F, He Y, Zhong M, Luo H, Qiu D, Li C, Yang H, He G, Wang Y. A comparison of volumetric modulated arc therapy and sliding-window intensity-modulated radiotherapy in the treatment of Stage I-II nasal natural killer/T-cell lymphoma. Med Dosim 2015; 41:42-6. [PMID: 26428072 DOI: 10.1016/j.meddos.2015.07.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 06/05/2015] [Accepted: 07/17/2015] [Indexed: 11/25/2022]
Abstract
This article is aimed to compare the dosimetric differences between volumetric modulated arc therapy (VMAT) and intensity-modulated radiotherapy (IMRT) for Stage I-II nasal natural killer/T-cell lymphoma (NNKTL). Ten patients with Stage I-II NNKTL treated with IMRT were replanned with VMAT (2 arcs). The prescribed dose of the planning target volume (PTV) was 50Gy in 25 fractions. The VMAT plans with the Anisotropic Analytical Algorithm (Version 8.6.15) were based on an Eclipse treatment planning system; the monitor units (MUs) and treatment time (T) were scored to measure the expected treatment efficiency. All the 10 patients under the study were subject to comparisons regarding the quality of target coverage, the efficiency of delivery, and the exposure of normal adjacent organs at risk (OARs). The study shows that VMAT was associated with a better conformal index (CI) and homogeneity index (HI) (both p < 0.05) but slightly higher dose to OARs than IMRT. The MUs with VMAT (650.80 ± 24.59) were fewer than with IMRT (1300.10 ± 57.12) (relative reduction of 49.94%, p = 0.00) when using 2-Gy dose fractions. The treatment time with VMAT (3.20 ± 0.02 minutes) was shorter than with IMRT (7.38 ± 0.18 minutes) (relative reduction of 56.64%, p = 0.00). We found that VMAT and IMRT both provide satisfactory target dosimetric coverage and OARs sparing clinically. Likely to deliver a bit higher dose to OARs, VMAT in comparison with IMRT, is still a better choice for treatment of patients with Stage I-II NNKTL, thanks to better dose distribution, fewer MUs, and shorter delivery time.
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Affiliation(s)
- Xianfeng Liu
- Department of Radiation Oncology, Chongqing Cancer Institute, Chongqing, PR China
| | - Yong Yang
- Department of Radiation Oncology, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, PR China
| | - Fu Jin
- Department of Radiation Oncology, Chongqing Cancer Institute, Chongqing, PR China
| | - Yanan He
- Department of Radiation Oncology, Chongqing Cancer Institute, Chongqing, PR China
| | - Mingsong Zhong
- Department of Radiation Oncology, Chongqing Cancer Institute, Chongqing, PR China
| | - Huanli Luo
- Department of Radiation Oncology, Chongqing Cancer Institute, Chongqing, PR China
| | - Da Qiu
- Department of Radiation Oncology, Chongqing Cancer Institute, Chongqing, PR China
| | - Chao Li
- Department of Radiation Oncology, Chongqing Cancer Institute, Chongqing, PR China
| | - Han Yang
- Department of Radiation Oncology, Chongqing Cancer Institute, Chongqing, PR China
| | - Guanglei He
- Department of Radiation Oncology, Chongqing Cancer Institute, Chongqing, PR China
| | - Ying Wang
- Department of Radiation Oncology, Chongqing Cancer Institute, Chongqing, PR China.
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Comparison of a new noncoplanar intensity-modulated radiation therapy technique for craniospinal irradiation with 3 coplanar techniques. Med Dosim 2015; 40:296-303. [PMID: 26002123 DOI: 10.1016/j.meddos.2015.03.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 02/15/2015] [Accepted: 03/19/2015] [Indexed: 11/20/2022]
Abstract
When standard conformal x-ray technique for craniospinal irradiation is used, it is a challenge to achieve satisfactory dose coverage of the target including the area of the cribriform plate, while sparing organs at risk. We present a new intensity-modulated radiation therapy (IMRT), noncoplanar technique, for delivering irradiation to the cranial part and compare it with 3 other techniques and previously published results. A total of 13 patients who had previously received craniospinal irradiation with standard conformal x-ray technique were reviewed. New treatment plans were generated for each patient using the noncoplanar IMRT-based technique, a coplanar IMRT-based technique, and a coplanar volumetric-modulated arch therapy (VMAT) technique. Dosimetry data for all patients were compared with the corresponding data from the conventional treatment plans. The new noncoplanar IMRT technique substantially reduced the mean dose to organs at risk compared with the standard radiation technique. The 2 other coplanar techniques also reduced the mean dose to some of the critical organs. However, this reduction was not as substantial as the reduction obtained by the noncoplanar technique. Furthermore, compared with the standard technique, the IMRT techniques reduced the total calculated radiation dose that was delivered to the normal tissue, whereas the VMAT technique increased this dose. Additionally, the coverage of the target was significantly improved by the noncoplanar IMRT technique. Compared with the standard technique, the coplanar IMRT and the VMAT technique did not improve the coverage of the target significantly. All the new planning techniques increased the number of monitor units (MU) used-the noncoplanar IMRT technique by 99%, the coplanar IMRT technique by 122%, and the VMAT technique by 26%-causing concern for leak radiation. The noncoplanar IMRT technique covered the target better and decreased doses to organs at risk compared with the other techniques. All the new techniques increased the number of MU compared with the standard technique.
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Ślosarek K, Osewski W, Grządziel A, Radwan M, Dolla Ł, Szlag M, Stąpór-Fudzińska M. Integral dose: Comparison between four techniques for prostate radiotherapy. Rep Pract Oncol Radiother 2015; 20:99-103. [PMID: 25859398 PMCID: PMC4338216 DOI: 10.1016/j.rpor.2014.10.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 06/17/2014] [Accepted: 10/17/2014] [Indexed: 11/17/2022] Open
Abstract
AIM Comparisons of integral dose delivered to the treatment planning volume and to the whole patient body during stereotactic, helical and intensity modulated radiotherapy of prostate. BACKGROUND Multifield techniques produce large volumes of low dose inside the patient body. Delivered dose could be the result of the cytotoxic injuries of the cells even away from the treatment field. We calculated the total dose absorbed in the patient body for four radiotherapy techniques to investigate whether some methods have a potential to reduce the exposure to the patient. MATERIALS AND METHODS We analyzed CyberKnife plans for 10 patients with localized prostate cancer. Five alternative plans for each patient were calculated with the VMAT, IMRT and TomoTherapy techniques. Alternative dose distributions were calculated to achieve the same coverage for PTV. Integral Dose formula was used to calculate the total dose delivered to the PTV and whole patient body. RESULTS Analysis showed that the same amount of dose was deposited to the treated volume despite different methods of treatment delivery. The mean values of total dose delivered to the whole patient body differed significantly for each treatment technique. The highest integral dose in the patient's body was at the TomoTherapy and CyberKnife treatment session. VMAT was characterized by the lowest integral dose deposited in the patient body. CONCLUSIONS The highest total dose absorbed in normal tissue was observed with the use of a robotic radiosurgery system and TomoTherapy. These results demonstrate that the exposure of healthy tissue is a dosimetric factor which differentiates the dose delivery methods.
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Affiliation(s)
- Krzysztof Ślosarek
- MSC Memorial Cancer Center and Institute of Oncology Gliwice Branch, Department of Radiotherapy and Brachytherapy Planning, ul. Wybrzeża Armii Krajowej 15, 44-101 Gliwice, Poland
| | - Wojciech Osewski
- MSC Memorial Cancer Center and Institute of Oncology Gliwice Branch, Radiotherapy Department, ul. Wybrzeża Armii Krajowej 15, 44-101 Gliwice, Poland
| | - Aleksandra Grządziel
- MSC Memorial Cancer Center and Institute of Oncology Gliwice Branch, Department of Radiotherapy and Brachytherapy Planning, ul. Wybrzeża Armii Krajowej 15, 44-101 Gliwice, Poland
| | - Michał Radwan
- MSC Memorial Cancer Center and Institute of Oncology Gliwice Branch, Department of Radiotherapy and Brachytherapy Planning, ul. Wybrzeża Armii Krajowej 15, 44-101 Gliwice, Poland
| | - Łukasz Dolla
- MSC Memorial Cancer Center and Institute of Oncology Gliwice Branch, Department of Radiotherapy and Brachytherapy Planning, ul. Wybrzeża Armii Krajowej 15, 44-101 Gliwice, Poland
| | - Marta Szlag
- MSC Memorial Cancer Center and Institute of Oncology Gliwice Branch, Department of Radiotherapy and Brachytherapy Planning, ul. Wybrzeża Armii Krajowej 15, 44-101 Gliwice, Poland
| | - Małgorzata Stąpór-Fudzińska
- MSC Memorial Cancer Center and Institute of Oncology Gliwice Branch, Department of Radiotherapy and Brachytherapy Planning, ul. Wybrzeża Armii Krajowej 15, 44-101 Gliwice, Poland
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Khan F, Craft D. Three-dimensional conformal planning with low-segment multicriteria intensity modulated radiation therapy optimization. Pract Radiat Oncol 2015; 5:e103-11. [PMID: 25413405 PMCID: PMC4355263 DOI: 10.1016/j.prro.2014.07.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 07/03/2014] [Accepted: 07/04/2014] [Indexed: 11/15/2022]
Abstract
PURPOSE The purpose of this study was to evaluate automated multicriteria optimization (MCO), which is designed for intensity modulated radiation therapy (IMRT) but invoked with limited segmentation, to efficiently produce high-quality 3-dimensional (3D) conformal radiation therapy (3D-CRT) plans. METHODS AND MATERIALS Treatment for 10 patients previously planned with 3D-CRT to various disease sites (brain, breast, lung, abdomen, pelvis) was replanned with a low-segment inverse MCO technique. The MCO-3D plans used the same beam geometry of the original 3D plans but were limited to an energy of 6 MV. The MCO-3D plans were optimized with fluence-based MCO IMRT and then, after MCO navigation, segmented with a low number of segments. The 3D and MCO-3D plans were compared by evaluating mean dose for all structures, D95 (dose that 95% of the structure receives) and homogeneity indexes for targets, D1 and clinically appropriate dose-volume objectives for individual organs at risk (OARs), monitor units, and physician preference. RESULTS The MCO-3D plans reduced the mean doses to OARs (41 of a total of 45 OARs had a mean dose reduction; P << .01) and monitor units (7 of 10 plans had reduced monitor units; the average reduction was 17% [P = .08]) while maintaining clinical standards for coverage and homogeneity of target volumes. All MCO-3D plans were preferred by physicians over their corresponding 3D plans. CONCLUSIONS High-quality 3D plans can be produced by use of MCO-IMRT optimization, resulting in automated field-in-field-type plans with good monitor unit efficiency. Adoption of this technology in a clinic could improve plan quality and streamline treatment plan production by using a single system applicable to both IMRT and 3D planning.
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Affiliation(s)
- Fazal Khan
- Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - David Craft
- Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts.
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Murray LJ, Thompson CM, Lilley J, Cosgrove V, Franks K, Sebag-Montefiore D, Henry AM. Radiation-induced second primary cancer risks from modern external beam radiotherapy for early prostate cancer: impact of stereotactic ablative radiotherapy (SABR), volumetric modulated arc therapy (VMAT) and flattening filter free (FFF) radiotherapy. Phys Med Biol 2015; 60:1237-57. [DOI: 10.1088/0031-9155/60/3/1237] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Shang J, Kong W, Wang YY, Ding Z, Yan G, Zhe H. VMAT planning study in rectal cancer patients. Radiat Oncol 2014; 9:219. [PMID: 25319073 PMCID: PMC4205282 DOI: 10.1186/s13014-014-0219-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Accepted: 09/23/2014] [Indexed: 01/03/2023] Open
Abstract
Background To compare the dosimetric differences among fixed field intensity-modulated radiation therapy (IMRT), single-arc volumetric-modulated arc therapy (SA-VMAT) and double-arc volumetric-modulated arc therapy (DA-VMAT) plans in rectal cancer. Method Fifteen patients with rectal cancer previously treated with IMRT in our institution were selected for this study. For each patient, three plans were generated with the planning CT scan: one using a fixed beam IMRT, and two plans using the VMAT technique: SA-VMAT and DA-VMAT. Dose prescription to the PTV was 50 Gy in 2 Gy per fraction. Dose volume histograms (DVH) for the target volume and the organs at risk (small bowel, bladder, femoral heads and healthy tissue) were compared for these different techniques. Monitor units (MU) and delivery treatment time were also reported. Results DA-VMAT achieved the highest minimum planning target volume (PTV) dose and the lowest maximal dose, resulting in the most homogeneous PTV dose distribution. DA-VMAT also yielded the best CI, although the difference was not statistically significant. Between SA-VMAT and IMRT, the target dose coverage was largely comparable; however, SA-VMAT was able to achieve a better V95 and V107. VMAT showed to be inferior to IMRT in terms of organ at risk sparing, especially for the small bowel. Compared with IMRT, DA-VMAT increased the V15 of small bowel nearly 55 cc. The MU and treatment delivery time were significantly reduced by the use of VMAT techniques. Conclusion VMAT is a new radiation technique that combines the ability to achieve highly conformal dose distributions with highly efficient treatment delivery. Considering the inferior role of normal tissue sparing, especially for small bowel, VMAT need further investigation in rectal cancer treatment.
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Affiliation(s)
- Jun Shang
- Department of Radiation Oncology, General Hospital of Ningxia Medical University, No.804 Shengli Str, Yinchuan, 750004, Ningxia, China.
| | - Wei Kong
- Department of Radiation Oncology, General Hospital of Ningxia Medical University, No.804 Shengli Str, Yinchuan, 750004, Ningxia, China.
| | - Yan-yang Wang
- Department of Radiation Oncology, General Hospital of Ningxia Medical University, No.804 Shengli Str, Yinchuan, 750004, Ningxia, China.
| | - Zhe Ding
- Department of Radiation Oncology, General Hospital of Ningxia Medical University, No.804 Shengli Str, Yinchuan, 750004, Ningxia, China.
| | - Gang Yan
- Department of Radiation Oncology, General Hospital of Ningxia Medical University, No.804 Shengli Str, Yinchuan, 750004, Ningxia, China.
| | - Hong Zhe
- Department of Radiation Oncology, General Hospital of Ningxia Medical University, No.804 Shengli Str, Yinchuan, 750004, Ningxia, China.
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Ammar H, Eldebawy E, Maarouf E, Khalil W, Zaghloul MS. Evaluation of the peripheral dose and the conformity index for three stereotactic radiotherapy techniques: Arcs, noncoplanar fixed fields and intensity modulation. INTERNATIONAL JOURNAL OF CANCER THERAPY AND ONCOLOGY 2014. [DOI: 10.14319/ijcto.0204.2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Ardenfors O, Josefsson D, Dasu A. Are IMRT treatments in the head and neck region increasing the risk of secondary cancers? Acta Oncol 2014; 53:1041-7. [PMID: 24983652 DOI: 10.3109/0284186x.2014.925581] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Intensity-modulated radiation therapy (IMRT) has been increasingly employed for treating head and neck (H&N) tumours due to its ability to produce isodoses suitable for the complex anatomy of the region. The aim of this study was to assess possible differences between IMRT and conformal radiation therapy (CRT) with regard to risk of radiation-induced secondary malignancies for H&N tumours. MATERIAL AND METHODS IMRT and CRT plans were made for 10 H&N adult patients and the resulting treatment planning data were used to calculate the risk of radiation-induced malignancies in four different tissues. Three risk models with biologically relevant parameters were used for calculations. The influence of scatter radiation and repeated imaging sessions has also been investigated. RESULTS The results showed that the total lifetime risks of developing radiation-induced secondary malignancies from the two treatment techniques, CRT and IMRT, were comparable and in the interval 0.9-2.5%. The risk contributions from the primary beam and scatter radiation were comparable, whereas the contribution from repeated diagnostic imaging was considerably smaller. CONCLUSION The results indicated that the redistribution of the dose characteristic to IMRT leads to a redistribution of the risks in individual tissues. However, the total levels of risk were similar between the two irradiation techniques considered.
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MESH Headings
- Adult
- Algorithms
- Diagnostic Imaging/adverse effects
- Esophagus/radiation effects
- Female
- Head and Neck Neoplasms/radiotherapy
- Humans
- Hypopharyngeal Neoplasms/radiotherapy
- Lung/radiation effects
- Male
- Neoplasms, Radiation-Induced/etiology
- Neoplasms, Second Primary/etiology
- Organs at Risk/radiation effects
- Parotid Gland/radiation effects
- Phantoms, Imaging
- Photons/therapeutic use
- Radiotherapy Planning, Computer-Assisted/methods
- Radiotherapy, Conformal/adverse effects
- Radiotherapy, Conformal/methods
- Radiotherapy, Image-Guided/adverse effects
- Radiotherapy, Image-Guided/methods
- Radiotherapy, Intensity-Modulated/adverse effects
- Radiotherapy, Intensity-Modulated/methods
- Risk
- Scattering, Radiation
- Sex Factors
- Tongue Neoplasms/radiotherapy
- Tonsillar Neoplasms/radiotherapy
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Affiliation(s)
- Oscar Ardenfors
- Medical Radiation Physics, Department of Physics, Stockholm University , Stockholm , Sweden
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Joosten A, Bochud F, Moeckli R. A critical evaluation of secondary cancer risk models applied to Monte Carlo dose distributions of 2-dimensional, 3-dimensional conformal and hybrid intensity-modulated radiation therapy for breast cancer. Phys Med Biol 2014; 59:4697-722. [DOI: 10.1088/0031-9155/59/16/4697] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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49
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Constituent components of out-of-field scatter dose for 18-MV intensity modulated radiation therapy versus 3-dimensional conformal radiation therapy: a comparison with 6-MV and implications for carcinogenesis. Int J Radiat Oncol Biol Phys 2014; 90:645-53. [PMID: 25084609 DOI: 10.1016/j.ijrobp.2014.05.052] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 05/09/2014] [Accepted: 05/27/2014] [Indexed: 11/21/2022]
Abstract
PURPOSE To characterize and compare the components of out-of-field dose for 18-MV intensity modulated radiation therapy (IMRT) versus 3-dimensional conformal radiation therapy (3D-CRT) and their 6-MV counterparts and consider implications for second cancer induction. METHODS AND MATERIALS Comparable plans for each technique/energy were delivered to a water phantom with a sloping wall; under full scatter conditions; with field edge abutting but outside the bath to prevent internal/phantom scatter; and with shielding below the linear accelerator head to attenuate head leakage. Neutron measurements were obtained from published studies. RESULTS Eighteen-megavolt IMRT produces 1.7 times more out-of-field scatter than 18-MV 3D-CRT. In absolute terms, however, differences are just approximately 0.1% of central axis dose. Eighteen-megavolt IMRT reduces internal/patient scatter by 13%, but collimator scatter (C) is 2.6 times greater than 18-MV 3D-CRT. Head leakage (L) is minimal. Increased out-of-field photon scatter from 18-MV IMRT carries out-of-field second cancer risks of approximately 0.2% over and above the 0.4% from 18-MV 3D-CRT. Greater photoneutron dose from 18-MV IMRT may result in further maximal, absolute increased risk to peripheral tissue of approximately 1.2% over 18-MV 3D-CRT. Out-of-field photon scatter remains comparable for the same modality irrespective of beam energy. Machine scatter (C+L) from 18 versus 6 MV is 1.2 times higher for IMRT and 1.8 times for 3D-CRT. It is 4 times higher for 6-MV IMRT versus 3D-CRT. Reduction in internal scatter with 18 MV versus 6 MV is 27% for 3D-CRT and 29% for IMRT. Compared with 6-MV 3D-CRT, 18-MV IMRT increases out-of-field second cancer risk by 0.2% from photons and adds 0.28-2.2% from neutrons. CONCLUSIONS Out-of-field photon dose seems to be independent of beam energy for both techniques. Eighteen-megavolt IMRT increases out-of-field scatter 1.7-fold over 3D-CRT because of greater collimator scatter despite reducing internal/patient scatter. Out-of-field carcinogenic risk is thus increased (but improved in-field dose conformity may offset this). Potentially increased carcinogenic risk should be weighed against any benefit 18-MV IMRT may provide.
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50
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Martin LM, Marples B, Lynch TH, Hollywood D, Marignol L. Exposure to low dose ionising radiation: Molecular and clinical consequences. Cancer Lett 2014; 349:98-106. [DOI: 10.1016/j.canlet.2013.12.015] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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