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Fukumitsu N, Kubota H, Demizu Y, Suzuki T, Hasegawa D, Kosaka Y, Kawamura A, Soejima T. Comparison of passive-scattered and intensity-modulated proton beam therapy of craniospinal irradiation with proton beams for pediatric and young adult patients with brain tumors. Jpn J Radiol 2024; 42:182-189. [PMID: 37874526 PMCID: PMC10811119 DOI: 10.1007/s11604-023-01499-8] [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: 05/29/2023] [Accepted: 09/06/2023] [Indexed: 10/25/2023]
Abstract
PURPOSE To investigate the dose stability of craniospinal irradiation based on irradiation method of proton beam therapy (PBT). METHODS AND MATERIALS Twenty-four pediatric and young adult brain tumor patients (age: 1-24 years) were examined. Treatment method was passive-scattered PBT (PSPT) in 8 patients and intensity-modulated PBT (IMPT) in 16 patients. The whole vertebral body (WVB) technique was used in 13 patients whose ages were younger than 10, and vertebral body sparing (VBS) technique was used for the remaining 11 patients aged 10 and above. Dose stability of planning target volume (PTV) against set-up error was investigated. RESULTS The minimum dose (Dmin) of IMPT was higher than that of PSPT (p = 0.01). Inhomogeneity index (INH) of IMPT was lower than that of PSPT (p = 0.004). When the irradiation field of the cervical spinal cord level (C level) was shifted, the maximum dose (Dmax) was lower in IMPT, and mean dose (Dmean) was higher than PSPT as movement became greater to the cranial-caudal direction (p = 0.000-0.043). Dmin was higher and INH was lower in IMPT in all directions (p = 0.000-0.034). When the irradiation field of the lumber spinal cord level (L level) was shifted, Dmax was lower in IMPT as movement became greater to the cranial direction (p = 0.000-0.028). Dmin was higher and INH was lower in IMPT in all directions (p = 0.000-0.022). CONCLUSIONS The PTV doses of IMPT and PSPT are robust and stable in both anterior-posterior and lateral directions at both C level and L level, but IMPT is more robust and stable than PSPT for cranial-caudal movements. TRIAL REGISTRY Clinical Trial Registration number: No. 04-03.
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Affiliation(s)
- Nobuyoshi Fukumitsu
- Department of Radiation Oncology, Kobe Proton Center, 1-6-8, Minatojima-Minamimachi, Kobe, 650-0047, Japan.
| | - Hikaru Kubota
- Department of Radiation Oncology, Kobe Proton Center, 1-6-8, Minatojima-Minamimachi, Kobe, 650-0047, Japan
| | - Yusuke Demizu
- Department of Radiation Oncology, Kobe Proton Center, 1-6-8, Minatojima-Minamimachi, Kobe, 650-0047, Japan
| | - Takeshi Suzuki
- Department of Anesthesiology, Kobe Proton Center, Kobe, Japan
| | - Daiichiro Hasegawa
- Department of Hematology and Oncology, Hyogo Children's Hospital, Kobe, Japan
| | - Yoshiyuki Kosaka
- Department of Hematology and Oncology, Hyogo Children's Hospital, Kobe, Japan
| | | | - Toshinori Soejima
- Department of Radiation Oncology, Kobe Proton Center, 1-6-8, Minatojima-Minamimachi, Kobe, 650-0047, Japan
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Syed H, Teferi N, Hanson A, Challa M, Eschbacher K, Hitchon P. Clinical diagnostic and radiographic features of primary spinal atypical teratoid rhabdoid tumors tumor in a pediatric patient: A case report and review of the literature. J Cent Nerv Syst Dis 2023; 15:11795735231209199. [PMID: 37876767 PMCID: PMC10591496 DOI: 10.1177/11795735231209199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 10/05/2023] [Indexed: 10/26/2023] Open
Abstract
Atypical teratoid rhabdoid tumors (ATRTs) are rare embryonal tumors comprising 1-2% of all pediatric CNS neoplasms. Spinal ATRTs are even more uncommon, accounting for 2% of all reported ATRT cases. Despite their rarity, ATRTs affect young children disproportionately and are characterized by a high malignant potential due to a heterogeneous cellular composition and inactivating mutations in the SMARCB1 (90%) and SMARCA4 (10%) genes. A 15-month-old female presented with a 2-week history of decreased lower extremity movement and new-onset need for assistance with ambulation. MRI lumbar spine revealed a contrast-enhancing intradural mass at the L3-L4 level with iso-intensity on T1 and T2 sequences. The patient subsequently underwent subtotal tumor resection (∼80%) given concerns for maintaining neurological function. Final pathology was consistent with spinal ATRT, and she later underwent adjuvant chemoradiation therapy per ACNS0333 protocol. She has since remained in remission with age-appropriate developmental milestones over the past 2 years. ATRTs should be considered in the differential diagnosis of intradural spinal lesions, especially in the pediatric patient population. Clinical course, presentation, and diagnosis is often delayed due to the rarity of these tumors, but contrasted craniospinal MRI is key for diagnosis and histopathology with IHC staining showing loss of INI is confirmatory. While gross total resection is the goal, maximal safe tumor resection should be prioritized in order to preserve neurological function. Adjuvant chemoradiation following gross total/subtotal resection has been shown to significantly improve overall survival.
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Affiliation(s)
- Hashim Syed
- Department of Neurosurgery, University of Iowa Hospital and Clinics, Iowa City, IA, USA
| | - Nahom Teferi
- Department of Neurosurgery, University of Iowa Hospital and Clinics, Iowa City, IA, USA
| | - Alec Hanson
- University of Iowa, Carver College of Medicine, Iowa City, IA, USA
| | - Meron Challa
- University of Iowa, Carver College of Medicine, Iowa City, IA, USA
| | - Kathryn Eschbacher
- Department of Pathology, University of Iowa Hospital and Clinics, Iowa City, IA, USA
| | - Patrick Hitchon
- Department of Neurosurgery, University of Iowa Hospital and Clinics, Iowa City, IA, USA
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Fukumitsu N, Kubota H, Mima M, Demizu Y, Suzuki T, Hasegawa D, Kosaka Y, Kawamura A, Soejima T. Comparison of Craniospinal Irradiation Using Proton Beams According to Irradiation Method and Initial Experience Treating Pediatric Patients. Adv Radiat Oncol 2023; 8:101251. [PMID: 37408669 PMCID: PMC10318217 DOI: 10.1016/j.adro.2023.101251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 04/11/2023] [Indexed: 07/07/2023] Open
Abstract
Purpose This study compared craniospinal irradiation using proton beam therapy (PBT) according to irradiation method and investigated the initial effects. Methods and Materials Twenty-four pediatric patients (1-24 years old) who received proton craniospinal irradiation were examined. Passive scattered PBT (PSPT) and intensity modulated PBT (IMPT) were used in 8 and 16 patients, respectively. The whole vertebral body technique was used for 13 patients <10 years old, and the vertebral body sparing (VBS) technique was used for the remaining 11 patients aged ≥10 years. The follow-up period was 17 to 44 (median, 27) months. Organ-at-risk and planning target volume (PTV) doses and other clinical data were examined. Results The maximum lens dose using IMPT was lower than that using PSPT (P = .008). The mean thyroid, lung, esophagus, and kidney doses were lower in patients treated using the VBS technique compared with the whole vertebral body technique (all P < .001). The minimum PTV dose of IMPT was higher than that of PSPT (P = .01). The inhomogeneity index of IMPT was lower than that of PSPT (P = .004). Conclusions IMPT is better than PSPT at reducing the dose to the lens. The VBS technique can decrease the doses to neck-chest-abdomen organs. The PTV coverage of IMPT is superior to that of PSPT.
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Affiliation(s)
| | | | | | | | | | | | | | - Atsufumi Kawamura
- Neurosurgery, Hyogo Prefectual Kobe Children's Hospital, Kobe, Japan
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Hrinivich WT, Li H, Tran A, Acharya S, Ladra MM, Sheikh K. Clinical Characterization of a Table Mounted Range Shifter Board for Synchrotron-Based Intensity Modulated Proton Therapy for Pediatric Craniospinal Irradiation. Cancers (Basel) 2023; 15:cancers15112882. [PMID: 37296845 DOI: 10.3390/cancers15112882] [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: 03/28/2023] [Revised: 05/13/2023] [Accepted: 05/18/2023] [Indexed: 06/12/2023] Open
Abstract
Purpose: To report our design, manufacturing, commissioning and initial clinical experience with a table-mounted range shifter board (RSB) intended to replace the machine-mounted range shifter (MRS) in a synchrotron-based pencil beam scanning (PBS) system to reduce penumbra and normal tissue dose for image-guided pediatric craniospinal irradiation (CSI). Methods: A custom RSB was designed and manufactured from a 3.5 cm thick slab of polymethyl methacrylate (PMMA) to be placed directly under patients, on top of our existing couch top. The relative linear stopping power (RLSP) of the RSB was measured using a multi-layer ionization chamber, and output constancy was measured using an ion chamber. End-to-end tests were performed using the MRS and RSB approaches using an anthropomorphic phantom and radiochromic film measurements. Cone beam CT (CBCT) and 2D planar kV X-ray image quality were compared with and without the RSB present using image quality phantoms. CSI plans were produced using MRS and RSB approaches for two retrospective pediatric patients, and the resultant normal tissue doses were compared. Results: The RLSP of the RSB was found to be 1.163 and provided computed penumbra of 6.9 mm in the phantom compared to 11.8 mm using the MRS. Phantom measurements using the RSB demonstrated errors in output constancy, range, and penumbra of 0.3%, -0.8%, and 0.6 mm, respectively. The RSB reduced mean kidney and lung dose compared to the MRS by 57.7% and 46.3%, respectively. The RSB decreased mean CBCT image intensities by 86.8 HU but did not significantly impact CBCT or kV spatial resolution providing acceptable image quality for patient setup. Conclusions: A custom RSB for pediatric proton CSI was designed, manufactured, modeled in our TPS, and found to significantly reduce lateral proton beam penumbra compared to a standard MRS while maintaining CBCT and kV image-quality and is in routine use at our center.
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Affiliation(s)
- William T Hrinivich
- Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- The Johns Hopkins Proton Therapy Center, Johns Hopkins University School of Medicine, Washington, DC 20016, USA
| | - Heng Li
- Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- The Johns Hopkins Proton Therapy Center, Johns Hopkins University School of Medicine, Washington, DC 20016, USA
| | - Anh Tran
- Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- The Johns Hopkins Proton Therapy Center, Johns Hopkins University School of Medicine, Washington, DC 20016, USA
| | - Sahaja Acharya
- Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- The Johns Hopkins Proton Therapy Center, Johns Hopkins University School of Medicine, Washington, DC 20016, USA
| | - Matthew M Ladra
- Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- The Johns Hopkins Proton Therapy Center, Johns Hopkins University School of Medicine, Washington, DC 20016, USA
| | - Khadija Sheikh
- Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- The Johns Hopkins Proton Therapy Center, Johns Hopkins University School of Medicine, Washington, DC 20016, USA
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Gorelyshev S, Medvedeva O, Mazerkina N, Ryzhova M, Krotkova O, Golanov A. Medulloblastomas in Pediatric and Adults. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1405:117-152. [PMID: 37452937 DOI: 10.1007/978-3-031-23705-8_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
Medulloblastoma is the primary malignant embryonic tumor of the cerebellum and the most common malignant tumor of childhood, accounting up to 25% of all CNS tumors in children, but is extremely rare in adults. Despite the fact that medulloblastomas are one of the most malignant human tumors, it is worthy to note that a great breakthrough has been achieved in our understanding of oncogenesis and the development of real methods of treatment. The main objective of surgical treatment is a maximum resection of tumor with minimal impairment of neurological functions, in order to reduce the volume, remove tumor tissue, get the biopsy, and restore the cerebrospinal fluid flow. The progress of surgical techniques (using a microscope, ultrasound suction), anesthesiology, and intensive care has significantly decreased surgical mortality and increased radicality of tumor removal. Postoperative mortality is less than one percent in most studies, while neurological complications have been reported between 5-10%. Radiotherapy is the main method of treatment in patients older than 3 years, which dramatically improved the recurrence-free survival. Nevertheless, the radiation therapy without systemic chemotherapy leads to a high risk of systemic metastases. After the role of chemotherapy was statistically proven, investigations of the optimal combination of different chemotherapy regimens continued around the world. Currently, 80% of patients can already be cured, however, the quality of life of patients in the long-term period remains quite low, which depends on many factors including endocrinological, cognitive, neurological, and otoneurologic aspects. Thus, the main strategic goal of the development of neuro-oncology is to reduce the doses of radiation therapy to the CNS and the main task of international research is to optimize existing protocols and develop fundamentally new ones based on molecular genetic research in order to improve the quality of life.
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Affiliation(s)
- Sergey Gorelyshev
- Pediatric Neurosurgical Department, N.N. Burdenko National Medical Research Centre of Neurosurgery, Moscow, Russia.
| | - Olga Medvedeva
- Pediatric Neurosurgical Department, N.N. Burdenko National Medical Research Centre of Neurosurgery, Moscow, Russia
| | - Nadezhda Mazerkina
- Pediatric Neurosurgical Department, N.N. Burdenko National Medical Research Centre of Neurosurgery, Moscow, Russia
| | - Marina Ryzhova
- Department of Neuropathology, N.N. Burdenko National Medical Research Centre of Neurosurgery, Moscow, Russia
| | - Olga Krotkova
- N.N. Burdenko National Medical Research Centre of Neurosurgery, Moscow, Russia
| | - Andrey Golanov
- Department of Radiosurgery, N.N. Burdenko National Medical Research Centre of Neurosurgery, Moscow, Russia
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The Current State of Radiotherapy for Pediatric Brain Tumors: An Overview of Post-Radiotherapy Neurocognitive Decline and Outcomes. J Pers Med 2022; 12:jpm12071050. [PMID: 35887547 PMCID: PMC9315742 DOI: 10.3390/jpm12071050] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 06/10/2022] [Accepted: 06/13/2022] [Indexed: 11/17/2022] Open
Abstract
Tumors of the central nervous system are the most common solid malignancies diagnosed in children. While common, they are also found to have some of the lowest survival rates of all malignancies. Treatment of childhood brain tumors often consists of operative gross total resection with adjuvant chemotherapy or radiotherapy. The current body of literature is largely inconclusive regarding the overall benefit of adjuvant chemo- or radiotherapy. However, it is known that both are associated with conditions that lower the quality of life in children who undergo those treatments. Chemotherapy is often associated with nausea, emesis, significant fatigue, immunosuppression, and alopecia. While radiotherapy can be effective for achieving local control, it is associated with late effects such as endocrine dysfunction, secondary malignancy, and neurocognitive decline. Advancements in radiotherapy grant both an increase in lifetime survival and an increased lifetime for survivors to contend with these late effects. In this review, the authors examined all the published literature, analyzing the results of clinical trials, case series, and technical notes on patients undergoing radiotherapy for the treatment of tumors of the central nervous system with a focus on neurocognitive decline and survival outcomes.
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7
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Cacciotti C, Chordas C, Valentino K, Allen R, Lenzen A, Burns K, Nagarajan R, Manley P, Pillay-Smiley N. Cardiac Dysfunction in Medulloblastoma Survivors Treated with Photon Irradiation. Neurooncol Pract 2022; 9:338-343. [PMID: 35859541 PMCID: PMC9290868 DOI: 10.1093/nop/npac030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Medulloblastoma is an aggressive central nervous system (CNS) tumor that occurs mostly in the pediatric population. Treatment often includes a combination of surgical resection, craniospinal irradiation (CSI) and chemotherapy. Children who receive standard photon CSI are at risk for cardiac toxicities including coronary artery disease, left ventricular scarring and dysfunction, valvular damage, and atherosclerosis. Current survivorship guidelines recommend routine echocardiogram (ECHO) surveillance. In this multi-institution study, we describe markers of cardiac dysfunction in medulloblastoma survivors.
Methods
A retrospective chart review of medulloblastoma patients who had photon beam CSI followed by ECHO between 1980 and 2010 at Lurie Children’s Hospital and Dana-Farber/Boston Children’s Hospital.
Results
During the 30-year study period, 168 medulloblastoma patient records were identified. Included in this study were the 75 patients who received CSI or spinal radiation and ECHO follow up. The mean age at CSI was 8.6 years (range, 2.9-20), and the mean number of years between radiation (RT) completion and first ECHO was 7.4 (range, 2-16). Mean ejection fraction (EF) was 60.0% and shortening fraction (SF) was 33.8%. Five patients (7%) had abnormal ECHO results: three with EF <50% and two with SF <28%.
Conclusion
Majority of medulloblastoma patients who received CSI have relatively normal ECHOs post treatment, however 7% of patients had abnormal ECHOs. The implication of our study for medulloblastoma survivors is that further investigations are needed in this populations with a more systematic, longitudinal assessment to determine predictors and screenings.
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Affiliation(s)
- Chantel Cacciotti
- Dana Farber / Boston Children’s Cancer and Blood Disorder Center, Boston MA
- Children’s Hospital London Health Sciences/Western University, London, ON
| | - Christine Chordas
- Dana Farber / Boston Children’s Cancer and Blood Disorder Center, Boston MA
| | - Katie Valentino
- Ann & Robert H. Lurie Children’s Hospital/Northwestern University, Chicago IL
| | - Rudy Allen
- Ann & Robert H. Lurie Children’s Hospital/Northwestern University, Chicago IL
| | - Alicia Lenzen
- Ann & Robert H. Lurie Children’s Hospital/Northwestern University, Chicago IL
| | - Karen Burns
- Cincinnati Children’s Hospital Medical Center/University of Cincinnati, Cincinnati OH
| | - Rajaram Nagarajan
- Cincinnati Children’s Hospital Medical Center/University of Cincinnati, Cincinnati OH
| | - Peter Manley
- Dana Farber / Boston Children’s Cancer and Blood Disorder Center, Boston MA
| | - Natasha Pillay-Smiley
- Ann & Robert H. Lurie Children’s Hospital/Northwestern University, Chicago IL
- Cincinnati Children’s Hospital Medical Center/University of Cincinnati, Cincinnati OH
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Variation in Proton Craniospinal Irradiation Practice Patterns in the United States: A Pediatric Proton Consortium Registry (PPCR) Study. Int J Radiat Oncol Biol Phys 2021; 112:901-912. [PMID: 34808253 DOI: 10.1016/j.ijrobp.2021.11.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 11/03/2021] [Accepted: 11/14/2021] [Indexed: 11/23/2022]
Abstract
PURPOSE Craniospinal irradiation (CSI) is commonly used for pediatric brain tumors with a propensity for spread in craniospinal fluid, principally medulloblastoma. Evolving technology has led to the use of highly conformal radiation therapy (RT) techniques for CSI, including proton therapy. Target delineation and plan coverage are critical for CSI, but there is ongoing controversy and variability in these realms, with little available data on practice patterns. We sought to characterize proton CSI practice patterns in the United States by examining CSI plans in the Pediatric Proton/Photon Consortium Registry (PPCR). MATERIALS AND METHODS PPCR was queried for data on proton CSI patients from 2015 to early 2020. Each plan was manually reviewed, determining patient position; prescription dose; and coverage of optic nerves, vertebral bodies, spinal nerve roots, sacral nerves, and cranial foramina, among other variables. Two radiation oncologists blinded to clinical data and treating institution assessed coverage at the 95% prescription isodose line and per published European Society for Paediatric Oncology guidelines. Variability in coverage was assessed with nonparametric tests and univariate and multivariate logistic regression. RESULTS PPCR supplied data for 450 patients, 384 of whom had an evaluable portion of a CSI plan. Most patients (90.3%) were supine. Optic nerves were fully covered in 48.2%; sacral nerves in 87.7%; cranial foramina in 69.3%; and spinal nerves in 95.6%. Vertebral body (VB) sparing was used in 18.6% of skeletally immature cases, increasing over time (P < .001). Coverage in all categories was significantly different among treating institutions, on univariate and multivariate analyses. Cribriform plate deficits were rare, with marginal misses of the foramen ovale (17.4%) and frontal lobe (12%) most common. CONCLUSION We found consistent variation based on treating institution in proton CSI practices including optic nerve, VB, sacral nerve, cranial, and spinal nerve coverage. These data may serve as a baseline quantification of current proton CSI practices in the United States as they continue to evolve.
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Baliga S, Gallotto S, Bajaj B, Lewy J, Weyman E, Lawell M, Yeap BY, Ebb DE, Huang M, Caruso P, Perry A, Jones RM, MacDonald SM, Tarbell NJ, Yock TI. Decade Long Disease, Secondary Malignancy, and Brainstem Injury Outcomes in Pediatric and Young Adult Medulloblastoma Patients Treated with Proton Radiotherapy. Neuro Oncol 2021; 24:1010-1019. [PMID: 34788463 DOI: 10.1093/neuonc/noab257] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Survivors of pediatric medulloblastoma experience long term morbidity associated with the toxic effects of post-operative radiotherapy. Proton radiotherapy limits radiation dose to normal tissues thereby reducing side effects of treatment while maintaining high cure rates. However, long term data on disease outcomes and long-term effects of proton radiotherapy remain limited. METHODS 178 Pediatric medulloblastoma patients treated with proton radiotherapy between 2002-2016 at the Massachusetts General Hospital comprise the cohort of patients who were treated with surgery, radiation therapy and chemotherapy. We evaluated EFS, OS, and LC using the Kaplan Meier method. The cumulative incidence of brainstem injury and secondary malignancies was assessed. RESULTS Median follow-up was 9.3 years. 159 patients (89.3%) underwent a gross total resection (GTR). The 10-year OS for the entire cohort, standard risk, and intermediate/high risk patients was 79.3%, 86.9%, and 68.9% respectively. The 10-year EFS for entire cohort, SR, and IR/HR cohorts was 73.8%, 79.5%, and 66.2%. The 10-year EFS and OS for patients with GTR/NTR were 75.3% and 81.0% versus 57.7% and 61.0% for STR. On univariate analysis, IR/HR status was associated with inferior EFS, while both anaplastic histology and IR/HR status was associated with worse overall survival. The 10-year cumulative incidence of secondary tumors and brainstem injury was 5.6% and 2.1%, respectively. CONCLUSIONS In this cohort study of pediatric medulloblastoma, proton radiotherapy was effective and disease outcomes were comparable to historically treated photon cohorts. The incidence of secondary malignancies and brainstem injury was low in this cohort with mature follow up.
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Affiliation(s)
- Sujith Baliga
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Sara Gallotto
- Department of Radiation Oncology, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts
| | - Benjamin Bajaj
- Department of Radiation Oncology, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts
| | - Jaqueline Lewy
- Department of Radiation Oncology, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts
| | - Elizabeth Weyman
- Department of Radiation Oncology, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts
| | - Miranda Lawell
- Department of Radiation Oncology, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts
| | - Beow Y Yeap
- Department of Radiation Oncology, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts
| | - David E Ebb
- Department of Pediatric Hematology Oncology, Massachusetts General Hospital, Boston, Massachusetts
| | - Mary Huang
- Department of Pediatric Hematology Oncology, Massachusetts General Hospital, Boston, Massachusetts
| | - Paul Caruso
- Department of Pediatric Neuroradiology, Massachusetts General Hospital, Boston, Massachusetts
| | - Alisa Perry
- Department of Radiation Oncology, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts
| | - Robin M Jones
- Department of Pediatric Neurology, Massachusetts General Hospital, Boston, Massachusetts
| | - Shannon M MacDonald
- Department of Radiation Oncology, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts
| | - Nancy J Tarbell
- Department of Radiation Oncology, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts
| | - Torunn I Yock
- Department of Radiation Oncology, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts
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10
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Serra R, Zhao T, Huq S, Gorelick NL, Casaos J, Cecia A, Mangraviti A, Eberhart C, Bai R, Olivi A, Brem H, Jackson EM, Tyler B. Disulfiram and copper combination therapy targets NPL4, cancer stem cells and extends survival in a medulloblastoma model. PLoS One 2021; 16:e0251957. [PMID: 34731160 PMCID: PMC8565761 DOI: 10.1371/journal.pone.0251957] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 05/06/2021] [Indexed: 11/21/2022] Open
Abstract
Background Medulloblastoma (MB) is the most common brain malignancy in children, and is still responsible for significant mortality and morbidity. The aim of this study was to assess the safety and efficacy of Disulfiram (DSF), an FDA-approved inhibitor of Aldehyde-Dehydrogenase (ALDH), and Copper (Cu++) in human SSH-driven and Group 3 MB. The molecular mechanisms, effect on cancer-stem-cells (CSC) and DNA damage were investigated in xenograft models. Methods The cytotoxic and anti-CSC effects of DSF/Cu++ were evaluated with clonogenic assays, flow-cytometry, immunofluorescence, western-blotting. ONS76, UW228 (SHH-driven with Tp53m), D425med, D283 and D341 (Group 3) cell-lines were used. In vivo survival and nuclear protein localization protein-4 (NPL4), Ki67, Cleaved-Caspase-3, GFAP and NeuN expression were assessed in two Group 3 MB xenografts with immunohistochemistry and western-blotting. Results Significant in vitro cytotoxicity was demonstrated at nanomolar concentrations. DSF/Cu++ induced cell-death through NPL4 accumulation in cell-nucleus and buildup of poly-ubiquitylated proteins. Flow-cytometry demonstrated a significant decrease in ALDH+, Nestin+ and CD133+ following treatment, anti-CSC effect was confirmed in vitro and in vivo. DSF/Cu++ prolonged survival, and increased nuclear NPL4 expression in vivo. Conclusions Our data suggest that this combination may serve as a novel treatment, as monotherapy or in combination with existing therapies, for aggressive subtypes of pediatric MB.
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Affiliation(s)
- Riccardo Serra
- Department of Neurosurgery, Hunterian Neurosurgical Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
- * E-mail:
| | - Tianna Zhao
- Department of Neurosurgery, Hunterian Neurosurgical Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Sakibul Huq
- Department of Neurosurgery, Hunterian Neurosurgical Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Noah Leviton Gorelick
- Department of Neurosurgery, Hunterian Neurosurgical Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Joshua Casaos
- Department of Neurosurgery, Hunterian Neurosurgical Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Arba Cecia
- Department of Neurosurgery, Hunterian Neurosurgical Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Antonella Mangraviti
- Department of Neurosurgery, School of Medicine - Catholic University of the Sacred Heart, Rome, Italy
| | - Charles Eberhart
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Renyuan Bai
- Department of Neurosurgery, Hunterian Neurosurgical Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Alessandro Olivi
- Department of Neurosurgery, School of Medicine - Catholic University of the Sacred Heart, Rome, Italy
| | - Henry Brem
- Department of Neurosurgery, Hunterian Neurosurgical Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
- Department of Opthalmology, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Eric M. Jackson
- Department of Neurosurgery, Hunterian Neurosurgical Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Betty Tyler
- Department of Neurosurgery, Hunterian Neurosurgical Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
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11
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Bär E, Collins-Fekete CA, Rompokos V, Zhang Y, Gaze MN, Warry A, Poynter A, Royle G. Assessment of the impact of CT calibration procedures for proton therapy planning on pediatric treatments. Med Phys 2021; 48:5202-5218. [PMID: 34174092 DOI: 10.1002/mp.15062] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 06/11/2021] [Accepted: 06/13/2021] [Indexed: 12/30/2022] Open
Abstract
PURPOSE Relative stopping powers (RSPs) for proton therapy are estimated using single-energy computed tomography (SECT), calibrated with standardized tissues of the adult male. It is assumed that those tissues are representative of tissues of all age and sex. Female, male, and pediatric tissues differ from one another in density and composition. In this study, we use tabulated pediatric tissues and computational phantoms to investigate the impact of this assumption on pediatric proton therapy. The potential of dual-energy CT (DECT) to improve the accuracy of these calculations is explored. METHODS We study 51 human body tissues, categorized into male/female for the age groups newborn, 1-, 5-, 10-, and 15-year-old children, and adult, with given compositions and densities. CT numbers are simulated and RSPs are estimated using SECT and DECT methods. Estimated tissue RSPs from each method are compared to theoretical RSPs. The dose and range errors of each approach are evaluated on three computational phantoms (Ewing's sarcoma, salivary sarcoma, and glioma) derived from pediatric proton therapy patients. RESULTS With SECT, soft tissues have mean estimation errors and standard deviation up to (1.96 ± 4.18)% observed in newborns, compared to (0.20 ± 1.15)% in adult males. Mean estimation errors for bones are up to (-3.35 ± 4.76)% in pediatrics as opposed to (0.10 ± 0.66)% in adult males. With DECT, mean errors reduce to (0.17 ± 0.13)% and (0.23 ± 0.22)% in newborns (soft tissues/bones). With SECT, dose errors in a Ewing's sarcoma phantom are exceeding 5 Gy (10% of prescribed dose) at the distal end of the treatment field, with volumes of dose errors >5 Gy ofV diff > 5 = 4630.7 mm3 . Similar observations are made in the head and neck phantoms, with overdoses to healthy tissue exceeding 2 Gy (4%). A systematic Bragg peak shift resulting in either over- or underdosage of healthy tissues and target volumes depending on the crossed tissues RSP prediction errors is observed. Water equivalent range errors of single beams are between -1.53 and 5.50 mm (min, max) (Ewing's sarcoma phantom), -0.78 and 3.62 mm (salivary sarcoma phantom), and -0.43 and 1.41 mm (glioma phantom). DECT can reduce dose errors to <1 Gy and range errors to <1 mm. CONCLUSION Single-energy computed tomography estimates RSPs for pediatric tissues with systematic shifts. DECT improves the accuracy of RSPs and dose distributions in pediatric tissues compared to the SECT calibration curve based on adult male tissues.
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Affiliation(s)
- Esther Bär
- Department of Medical Physics and Biomedical Engineering, University College London, London, UK
| | | | - Vasilis Rompokos
- Department of Radiotherapy Physics, University College London Hospitals NHS Foundation Trust, London, UK
| | - Ying Zhang
- Department of Medical Physics and Biomedical Engineering, University College London, London, UK
| | - Mark N Gaze
- Department of Oncology, University College London Hospitals NHS Foundation Trust, London, UK
| | - Alison Warry
- Department of Radiotherapy Physics, University College London Hospitals NHS Foundation Trust, London, UK
| | - Andrew Poynter
- Department of Radiotherapy Physics, University College London Hospitals NHS Foundation Trust, London, UK
| | - Gary Royle
- Department of Medical Physics and Biomedical Engineering, University College London, London, UK
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12
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Kim S, Kim SW, Han SJ, Lee S, Park HT, Song JY, Kim T. Molecular Mechanism and Prevention Strategy of Chemotherapy- and Radiotherapy-Induced Ovarian Damage. Int J Mol Sci 2021; 22:ijms22147484. [PMID: 34299104 PMCID: PMC8305189 DOI: 10.3390/ijms22147484] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 07/12/2021] [Indexed: 12/14/2022] Open
Abstract
Fertility preservation is an emerging discipline, which is of substantial clinical value in the care of young patients with cancer. Chemotherapy and radiation may induce ovarian damage in prepubertal girls and young women. Although many studies have explored the mechanisms implicated in ovarian toxicity during cancer treatment, its molecular pathophysiology is not fully understood. Chemotherapy may accelerate follicular apoptosis and follicle reservoir utilization and damage the ovarian stroma via multiple molecular reactions. Oxidative stress and the radiosensitivity of oocytes are the main causes of gonadal damage after radiation treatment. Fertility preservation options can be differentiated by patient age, desire for conception, treatment regimen, socioeconomic status, and treatment duration. This review will help highlight the importance of multidisciplinary oncofertility strategies for providing high-quality care to young female cancer patients.
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Affiliation(s)
- Seongmin Kim
- Gynecologic Cancer Center, CHA Ilsan Medical Center, CHA University College of Medicine, 1205 Jungang-ro, Ilsandong-gu, Goyang-si 10414, Korea;
| | - Sung-Woo Kim
- Department of Obstetrics and Gynecology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul 03080, Korea; (S.-W.K.); (S.-J.H.)
| | - Soo-Jin Han
- Department of Obstetrics and Gynecology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul 03080, Korea; (S.-W.K.); (S.-J.H.)
| | - Sanghoon Lee
- Department of Obstetrics and Gynecology, Korea University College of Medicine, 73 Inchon-ro, Seongbuk-gu, Seoul 02841, Korea; (H.-T.P.); (J.-Y.S.); (T.K.)
- Correspondence: ; Tel.: +82-2-920-6773
| | - Hyun-Tae Park
- Department of Obstetrics and Gynecology, Korea University College of Medicine, 73 Inchon-ro, Seongbuk-gu, Seoul 02841, Korea; (H.-T.P.); (J.-Y.S.); (T.K.)
| | - Jae-Yun Song
- Department of Obstetrics and Gynecology, Korea University College of Medicine, 73 Inchon-ro, Seongbuk-gu, Seoul 02841, Korea; (H.-T.P.); (J.-Y.S.); (T.K.)
| | - Tak Kim
- Department of Obstetrics and Gynecology, Korea University College of Medicine, 73 Inchon-ro, Seongbuk-gu, Seoul 02841, Korea; (H.-T.P.); (J.-Y.S.); (T.K.)
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13
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Yang TJ, Wijetunga NA, Yamada J, Wolden S, Mehallow M, Goldman DA, Zhang Z, Young RJ, Kris MG, Yu HA, Seidman AD, Gavrilovic IT, Lin A, Santomasso B, Grommes C, Piotrowski AF, Schaff L, Stone JB, DeAngelis LM, Boire A, Pentsova E. Clinical trial of proton craniospinal irradiation for leptomeningeal metastases. Neuro Oncol 2021; 23:134-143. [PMID: 32592583 PMCID: PMC7850116 DOI: 10.1093/neuonc/noaa152] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Leptomeningeal metastases (LM) are associated with limited survival and treatment options. While involved-field radiotherapy is effective for local palliation, it lacks durability. We evaluated the toxicities of proton craniospinal irradiation (CSI), a treatment encompassing the entire central nervous system (CNS) compartment, for patients with LM from solid tumors. METHODS We enrolled patients with LM to receive hypofractionated proton CSI in this phase I prospective trial. The primary endpoint was to describe treatment-related toxicity, with dose-limiting toxicity (DLT) defined as any radiation-related grade 3 non-hematologic toxicity or grade 4 hematologic toxicity according to the Common Terminology Criteria for Adverse Events that occurred during or within 4 weeks of completion of proton CSI. Secondary endpoints included CNS progression-free survival (PFS) and overall survival (OS). RESULTS We enrolled 24 patients between June 2018 and April 2019. Their median follow-up was 11 months. Twenty patients were evaluable for protocol treatment-related toxicities and 21 for CNS PFS and OS. Two patients in the dose expansion cohort experienced DLTs consisted of grade 4 lymphopenia, grade 4 thrombocytopenia, and/or grade 3 fatigue. All DLTs resolved without medical intervention. The median CNS PFS was 7 months (95% CI: 5-13) and the median OS was 8 months (95% CI: 6 to not reached). Four patients (19%) were progression-free in the CNS for more than 12 months. CONCLUSION Hypofractionated proton CSI using proton therapy is a safe treatment for patients with LM from solid tumors. We saw durable disease control in some patients.
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Affiliation(s)
- T Jonathan Yang
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York
- PROMISE (Precision Radiation for OligoMetastatIc and MetaStatic DiseasE) Program, Memorial Sloan Kettering Cancer Center, New York, New York
- Brain Tumor Center, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Neil A Wijetunga
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Josh Yamada
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York
- PROMISE (Precision Radiation for OligoMetastatIc and MetaStatic DiseasE) Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Suzanne Wolden
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Michelle Mehallow
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Debra A Goldman
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Zhigang Zhang
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Robert J Young
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Mark G Kris
- Division of Solid Tumor Oncology, Thoracic Oncology Service, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Helena A Yu
- Division of Solid Tumor Oncology, Thoracic Oncology Service, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Andrew D Seidman
- Division of Solid Tumor Oncology, Breast Medicine Service, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Igor T Gavrilovic
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
- Brain Tumor Center, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Andrew Lin
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
- Brain Tumor Center, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Bianca Santomasso
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Christian Grommes
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
- Brain Tumor Center, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Anna F Piotrowski
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
- Brain Tumor Center, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Lauren Schaff
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
- Brain Tumor Center, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Jacqueline B Stone
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
- Brain Tumor Center, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Lisa M DeAngelis
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
- Brain Tumor Center, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Adrienne Boire
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
- Brain Tumor Center, Memorial Sloan Kettering Cancer Center, New York, New York
- Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Elena Pentsova
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
- Brain Tumor Center, Memorial Sloan Kettering Cancer Center, New York, New York
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14
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Liu SM, Brooks ED, Rubin ML, Grosshans DR, Frank SJ, McAleer MF, McGovern SL, Paulino AC, Woodhouse KD. Referral Patterns and Treatment Delays in Medulloblastoma: A Large Academic Proton Center Experience. Int J Part Ther 2020; 7:1-10. [PMID: 33604411 PMCID: PMC7886269 DOI: 10.14338/ijpt-20-00038.1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 08/13/2020] [Indexed: 12/04/2022] Open
Abstract
Purpose Patient travel time can cause treatment delays when providers and families decide to seek proton therapy. We examined whether travel distance or referral pattern (domestic versus international) affects time to radiation therapy and subsequent disease outcomes in patients with medulloblastoma at a large academic proton center. Patients and Methods Children with medulloblastoma treated at MD Anderson (MDA) with a protocol of proton beam therapy (PBT) between January 4, 2007, and June 25, 2014, were included in the analysis. The Wilcoxon rank-sum test was used to study the association between time to start of radiation and distance. Classification- and regression-tree analyses were used to explore binary thresholds for continuous covariates (ie, distance). Failure-free survival was defined as the time interval between end of radiation and failure or death. Results 96 patients were included in the analysis: 17 were international (18%); 19 (20%) were from Houston, Texas; 21 were from other cities inside Texas (21%); and 39 (41%) were from other US states. The median time from surgery to start of radiation was not significantly different for international patients (median = 1.45 months) compared with US patients (median = 1.15 months; P = .13). However, time from surgery to start of radiation was significantly longer for patients residing > 1716 km (> 1066 miles) from MDA (median = 1.31 months) than for patients residing ≤ 1716 km (≤ 1066 miles) from MDA (median = 1.05 months; P = .01). This 1- to 2-week delay (median = 7.8 days) did not affect failure-free survival (hazard ratio = 1.34; P = .43). Conclusion We found that short delays in proton access can exist for patients traveling long distances to proton centers. However, in this study, treatment delays did not affect outcomes. This highlights the appropriateness of PBT in the face of travel coordination. Investment by proton centers in a rigorous intake process is justified to offer timely access to curative PBT.
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Affiliation(s)
- Sean M Liu
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Eric D Brooks
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Proton Therapy Center, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,University of Florida Health Proton Therapy Institute, Jacksonville, FL, USA
| | - M Laura Rubin
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | | | - David R Grosshans
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Proton Therapy Center, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Steven J Frank
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Proton Therapy Center, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Mary Frances McAleer
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Proton Therapy Center, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Susan L McGovern
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Proton Therapy Center, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Arnold C Paulino
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Proton Therapy Center, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Kristina D Woodhouse
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Proton Therapy Center, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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15
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The Art of Living With Symptoms: A Qualitative Study Among Patients With Primary Brain Tumors Receiving Proton Beam Therapy. Cancer Nurs 2020; 43:E79-E86. [PMID: 30688666 PMCID: PMC7043731 DOI: 10.1097/ncc.0000000000000692] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Symptom management in conjunction with proton beam therapy (PBT) from patient's perspective has not been explored. Such knowledge is essential to optimize the care in this relatively new treatment modality.
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16
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Kotecha R, Mehta MP, Chang EL, Brown PD, Suh JH, Lo SS, Das S, Samawi HH, Keith J, Perry J, Sahgal A. Updates in the management of intradural spinal cord tumors: a radiation oncology focus. Neuro Oncol 2020; 21:707-718. [PMID: 30977511 DOI: 10.1093/neuonc/noz014] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Primary spinal cord tumors represent a hetereogeneous group of central nervous system malignancies whose management is complex given the relatively uncommon nature of the disease and variety of tumor subtypes, functional neurologic deficits from the tumor, and potential morbidities associated with definitive treatment. Advances in neuroimaging; integration of diagnostic, prognostic, and predictive molecular testing into tumor classification; and developments in neurosurgical techniques have refined the current role of radiotherapy in the multimodal management of patients with primary spinal cord tumors, and corroborated the need for prospective, multidisciplinary discussion and treatment decision making. Radiotherapeutic technological advances have dramatically improved the entire continuum from treatment planning to treatment delivery, and the development of stereotactic radiosurgery and proton radiotherapy provides new radiotherapy options for patients treated in the definitive, adjuvant, or salvage setting. The objective of this comprehensive review is to provide a contemporary overview of the management of primary intradural spinal cord tumors, with a focus on radiotherapy.
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Affiliation(s)
- Rupesh Kotecha
- Department of Radiation Oncology, Miami Cancer Institute, Baptist Health South Florida, Miami, Florida, USA.,Herbert Wertheim College of Medicine, Florida International University, Miami, Florida, USA
| | - Minesh P Mehta
- Department of Radiation Oncology, Miami Cancer Institute, Baptist Health South Florida, Miami, Florida, USA.,Herbert Wertheim College of Medicine, Florida International University, Miami, Florida, USA
| | - Eric L Chang
- Department of Radiation Oncology, University of Southern California, Los Angeles, California, USA
| | - Paul D Brown
- Department of Radiation Oncology, Mayo Clinic, Rochester, Minnesota, USA
| | - John H Suh
- Department of Radiation Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, Ohio, USA.,Rose Ella Burkhardt Brain Tumor and Neuro-Oncology Center, Taussig Cancer Institute, Cleveland, Ohio, USA.,Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio, USA
| | - Simon S Lo
- Department of Radiation Oncology, University of Washington, Seattle, Washington, USA
| | - Sunit Das
- Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Haider H Samawi
- Division of Hematology/Oncology, St Michael's Hospital, Toronto, Ontario, Canada
| | - Julia Keith
- Department of Anatomical Pathology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
| | - James Perry
- Department of Neurology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
| | - Arjun Sahgal
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
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17
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Stripay JL, Merchant TE, Roussel MF, Tinkle CL. Preclinical Models of Craniospinal Irradiation for Medulloblastoma. Cancers (Basel) 2020; 12:cancers12010133. [PMID: 31948065 PMCID: PMC7016884 DOI: 10.3390/cancers12010133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 01/02/2020] [Accepted: 01/02/2020] [Indexed: 02/07/2023] Open
Abstract
Medulloblastoma is an embryonal tumor that shows a predilection for distant metastatic spread and leptomeningeal seeding. For most patients, optimal management of medulloblastoma includes maximum safe resection followed by adjuvant craniospinal irradiation (CSI) and chemotherapy. Although CSI is crucial in treating medulloblastoma, the realization that medulloblastoma is a heterogeneous disease comprising four distinct molecular subgroups (wingless [WNT], sonic hedgehog [SHH], Group 3 [G3], and Group 4 [G4]) with distinct clinical characteristics and prognoses has refocused efforts to better define the optimal role of CSI within and across disease subgroups. The ability to deliver clinically relevant CSI to preclinical models of medulloblastoma offers the potential to study radiation dose and volume effects on tumor control and toxicity in these subgroups and to identify subgroup-specific combination adjuvant therapies. Recent efforts have employed commercial image-guided small animal irradiation systems as well as custom approaches to deliver accurate and reproducible fractionated CSI in various preclinical models of medulloblastoma. Here, we provide an overview of the current clinical indications for, and technical aspects of, irradiation of pediatric medulloblastoma. We then review the current literature on preclinical modeling of and treatment interventions for medulloblastoma and conclude with a summary of challenges in the field of preclinical modeling of CSI for the treatment of leptomeningeal seeding tumors.
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Affiliation(s)
- Jennifer L. Stripay
- Departments of Tumor Cell Biology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA; (J.L.S.); (M.F.R.)
| | - Thomas E. Merchant
- Departments of Radiation Oncology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA;
| | - Martine F. Roussel
- Departments of Tumor Cell Biology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA; (J.L.S.); (M.F.R.)
| | - Christopher L. Tinkle
- Departments of Radiation Oncology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA;
- Correspondence: ; Tel.: +1-(901)-595-8735; Fax: +1-(901)-595-3113
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18
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Sherif RS, Elshemey WM, Attalla EM. The risk of secondary cancer in pediatric medulloblastoma patients due to three-dimensional conformal radiotherapy and intensity-modulated radiotherapy. Indian J Cancer 2019; 55:372-376. [PMID: 30829273 DOI: 10.4103/ijc.ijc_410_18] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Craniospinal irradiation (CSI) is the standard radiation therapy treatment for medulloblastoma. The aim of this study was to estimate and compare the lifetime risk of radiation-induced secondary cancer in pediatric medulloblastoma patients using three-dimensional conformal radiotherapy (3D-CRT) and intensity-modulated radiotherapy (IMRT). MATERIALS AND METHODS 3D-CRT and IMRT plans were performed for 10 CSI pediatric patients. The average absorbed doses for organs at risk (OARs) was calculated from dose-volume histograms on the treatment planning system. The average lifetime risk of radiation-induced secondary cancer was then calculated. RESULTS Lifetime risk of secondary cancer for CSI pediatric patients treated using IMRT decreases in some OARs compared with those treated using 3D-CRT. This is attributable to the decrease in the average absorbed dose in some OARs when using IMRT technique. CONCLUSION Follow-up of medulloblastoma pediatric patients should be performed after ending the treatment course in order to diagnose early secondary tumors. IMRT technique is substantially better than 3D-CRT in terms of lifetime risk of radiation-induced secondary cancer, probably due to reduced dose to OARs especially to the thyroid, which is the most sensitive organ to radiation.
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Affiliation(s)
- Reham S Sherif
- Department of Biophysics, Faculty of Science, Cairo University, Cairo, Egypt
| | - Wael M Elshemey
- Department of Biophysics, Faculty of Science, Cairo University, Cairo, Egypt
| | - Ehab M Attalla
- Department of Radiotherapy and Nuclear Medicine, National Cancer Institute, Cairo University, Giza; Department of Radiotherapy, Children Cancer Hospital, Cairo, Egypt
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19
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Johnson SB, Hung J, Kapadia N, Oh KS, Kim M, Hamstra DA. Spinal Growth Patterns After Craniospinal Irradiation in Children With Medulloblastoma. Pract Radiat Oncol 2018; 9:e22-e28. [PMID: 30036592 DOI: 10.1016/j.prro.2018.07.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 06/13/2018] [Accepted: 07/05/2018] [Indexed: 11/27/2022]
Abstract
PURPOSE This study aimed to evaluate the impact on spine growth in children with medulloblastoma using either photon or electron craniospinal irradiation (CSI). METHODS AND MATERIALS This was a single institution retrospective review of children who were treated with CSI for medulloblastoma. Spine growth was measured on magnetic resonance imaging scans at defined locations on the basis of a published predictive model of spine growth after CSI. Differences between spine growth in the anterior, middle, and posterior aspect of the designated vertebral segments were also assessed. Differences between the groups treated with photons or electrons were assessed with student's t test. RESULTS A total of 19 patients (10 patients treated with electrons and 9 with photons) with a median follow-up time of 45.5 months (confidence interval, 34.9-55.1 months) were evaluated. Patients treated with electrons were younger than those who received photons (5.1 years [range, 3.8-9.0 years] vs 9.6 years [range, 3.5-12.9 years]); however, there were no differences in other clinical characteristics, treatment, or follow-up between the groups. Spine growth rate for patients treated with electrons fit the predictive model (104% ± 5.2%), but patients treated with photons had growth that was faster than predicted by the model (150% ± 47%) and different from that observed with electrons. The differences between treatment the modalities were statistically significant (P = .03). For patients treated with photons, there were no statistical differences between the growth rate of the anterior vertebral body compared with the posterior aspect, but for patients treated with electrons, a faster spine growth in the anterior L1-L5 lumbar spine was observed compared with the posterior lumbar spine (3.90 vs 2.52 mm/year; P = .006) without differences in the cervical or thoracic spine. CONCLUSIONS The use of electrons to treat the craniospinal axis in children with medulloblastoma resulted in no significant difference in spine growth compared with the predicted spine growth on the basis of previously published models using photons, but with a clinically insignificant faster spine growth rate in the anterior lumbar spine.
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Affiliation(s)
- Skyler B Johnson
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut
| | - Jonathon Hung
- Department of Emergency Medicine, Northwestern University, Chicago, Illinois
| | - Nirav Kapadia
- Radiation Oncology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Kevin S Oh
- Massachusetts General Hospital, Boston, Massachusetts
| | - Michelle Kim
- The University of Michigan, Department of Radiation Oncology, Ann Arbor, Michigan
| | - Daniel A Hamstra
- Department of Radiation Oncology, Beaumont Health, Dearborn, Michigan.
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20
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Cardiac Toxicity After Craniospinal Irradiation: A Late Effect That May be Eliminated With Proton Therapy. J Pediatr Hematol Oncol 2018; 40:e330-e333. [PMID: 29200158 DOI: 10.1097/mph.0000000000001029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Craniospinal irradiation (CSI) is commonly required for pediatric patients with central nervous system malignancies. Traditionally, CSI is given using x-rays to deliver radiation to the brain and spine, exposing normal anterior structures, including heart, to unnecessary radiation. OBSERVATIONS We present a patient treated with x-ray CSI for medulloblastoma with spinal metastasis (3600 cGy CSI with focal boost to 5000 cGy), who subsequently developed significant cardiac toxicity, likely related to radiation exposure. CONCLUSIONS Spinal irradiation can cause significant cardiac risk due to exit dose through anterior structures. This toxicity may be avoided with proton therapy, which eliminates visceral exit dose.
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21
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Tasson A, Laack NN, Beltran C. Clinical Implementation of Robust Optimization for Craniospinal Irradiation. Cancers (Basel) 2018; 10:cancers10010007. [PMID: 29301336 PMCID: PMC5789357 DOI: 10.3390/cancers10010007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 12/15/2017] [Accepted: 12/26/2017] [Indexed: 12/02/2022] Open
Abstract
With robust optimization for spot scanning proton therapy now commercially available, the ability exists to account for setup, range, and interfield uncertainties during optimization. Robust optimization is particularly beneficial for craniospinal irradiation (CSI) where the large target volume lends itself to larger setup uncertainties and the need for robust match lines can all be handled with the uncertainty parameters found inside the optimizer. Suggested robust optimization settings, parameters, and image guidance for CSI patients using proton therapy spot scanning are provided. Useful structures are defined and described. Suggestions are given for perturbations to be entered into the optimizer in order to achieve a plan that provides robust target volume coverage and critical structure sparing as well as a robust match line. Interfield offset effects, a concern when using multifield optimization, can also be addressed within the robust optimizer. A robust optimizer can successfully be employed to produce robust match lines, target volume coverage, and critical structure sparing under specified uncertainties. The robust optimizer can also be used to reduce effects arising from interfield uncertainties. Using robust optimization, a plan robust against setup, range, and interfield uncertainties for craniospinal treatments can be created. Utilizing robust optimization allows one to ensure critical structures are spared and target volumes are covered under the desired uncertainty parameters.
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Affiliation(s)
- Alexandria Tasson
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA.
| | - Nadia N Laack
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA.
| | - Chris Beltran
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA.
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Szychot E, Seunarine K, Mankad K, Thust S, Clark C, Gaze MN, Michalski A. Impact of induction chemotherapy, hyperfractionated accelerated radiotherapy and high-dose thiotepa on brain volume loss and functional status of children with primitive neuroectodermal tumour. Pediatr Blood Cancer 2017; 64. [PMID: 28509337 DOI: 10.1002/pbc.26619] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Revised: 04/01/2017] [Accepted: 04/03/2017] [Indexed: 11/08/2022]
Abstract
BACKGROUND The introduction of aggressive chemo-radiotherapy regimens has improved overall survival in children with primitive neuroectodermal tumours (PNET). However, these combinations may result in neurotoxicity. Previously reported magnetic resonance imaging abnormalities in children receiving intensive sequential chemotherapy, hyperfractionated accelerated radiotherapy (HART) and high-dose thiotepa prompted us to investigate the degree of brain volume loss and patients' functional status after therapy. METHODS We retrospectively reviewed clinico-radiological data of children with PNET treated in this way at our centre. RESULTS We studied 14 children treated between December 2009 and April 2013. Data were not complete for one child. Performance status was severely restricted in four children, and mildly to moderately impaired in 7 of the 13 children. Eleven of 13 children showed mild-to-severe generalised neuroparenchymal atrophy, in 7 of whom neuroparenchymal volume loss was moderate to severe. Of these seven, six had received high-dose thiotepa. There was no correlation between brain volume loss and Lansky performance status. However, unexpected neurotoxicities, such as symptoms of transverse myelitis, were observed. CONCLUSION Measurement of brain volume loss in patients treated with HART and high-dose thiotepa may not be sufficient to predict function. However, correlation of brain volume loss due to late neurotoxicity with performance decline may be more obvious over longer period of follow-up. The combination of HART and myeloablative courses of thiotepa is associated with severe neurotoxicity and subsequent decline in performance status in a significant proportion of patients.
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Affiliation(s)
- Elwira Szychot
- Department of Clinical Studies, The Institute of Cancer Research, London, United Kingdom.,Department of Paediatric Oncology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Kiran Seunarine
- Developmental Imaging and Biophysics Section, Institute of Child Health, University College London, London, United Kingdom
| | - Kshitij Mankad
- Department of Radiology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Steffi Thust
- Department of Diagnostic Neuroradiology, National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Foundation Trust, London, United Kingdom
| | - Chris Clark
- Developmental Imaging and Biophysics Section, Institute of Child Health, University College London, London, United Kingdom
| | - Mark N Gaze
- Department of Oncology, University College London Hospitals NHS Foundation Trust, London, United Kingdom
| | - Antony Michalski
- Department of Paediatric Oncology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
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Giantsoudi D, Seco J, Eaton BR, Simeone FJ, Kooy H, Yock TI, Tarbell NJ, DeLaney TF, Adams J, Paganetti H, MacDonald SM. Evaluating Intensity Modulated Proton Therapy Relative to Passive Scattering Proton Therapy for Increased Vertebral Column Sparing in Craniospinal Irradiation in Growing Pediatric Patients. Int J Radiat Oncol Biol Phys 2017; 98:37-46. [PMID: 28587051 PMCID: PMC5466873 DOI: 10.1016/j.ijrobp.2017.01.226] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 12/27/2016] [Accepted: 01/25/2017] [Indexed: 11/25/2022]
Abstract
PURPOSE At present, proton craniospinal irradiation (CSI) for growing children is delivered to the whole vertebral body (WVB) to avoid asymmetric growth. We aimed to demonstrate the feasibility and potential clinical benefit of delivering vertebral body sparing (VBS) versus WVB CSI with passively scattered (PS) and intensity modulated proton therapy (IMPT) in growing children treated for medulloblastoma. METHODS AND MATERIALS Five plans were generated for medulloblastoma patients, who had been previously treated with CSI PS proton radiation therapy: (1) single posteroanterior (PA) PS field covering the WVB (PS-PA-WVB); (2) single PA PS field that included only the thecal sac in the target volume (PS-PA-VBS); (3) single PA IMPT field covering the WVB (IMPT-PA-WVB); (4) single PA IMPT field, target volume including thecal sac only (IMPT-PA-VBS); and (5) 2 posterior-oblique (-35°, +35°) IMPT fields, with the target volume including the thecal sac only (IMPT2F-VBS). For all cases, 23.4 Gy (relative biologic effectiveness [RBE]) was prescribed to 95% of the spinal canal. The dose, linear energy transfer, and variable-RBE-weighted dose distributions were calculated for all plans using the tool for particle simulation, version 2, Monte Carlo system. RESULTS IMPT VBS techniques efficiently spared the anterior vertebral bodies (AVBs), even when accounting for potential higher variable RBE predicted by linear energy transfer distributions. Assuming an RBE of 1.1, the V10 Gy(RBE) decreased from 100% for the WVB techniques to 59.5% to 76.8% for the cervical, 29.9% to 34.6% for the thoracic, and 20.6% to 25.1% for the lumbar AVBs, and the V20 Gy(RBE) decreased from 99.0% to 17.8% to 20.0% for the cervical, 7.2% to 7.6% for the thoracic, and 4.0% to 4.6% for the lumbar AVBs when IMPT VBS techniques were applied. The corresponding percentages for the PS VBS technique were higher. CONCLUSIONS Advanced proton techniques can sufficiently reduce the dose to the vertebral body and allow for vertebral column growth for children with central nervous system tumors requiring CSI. This was true even when considering variable RBE values. A clinical trial is planned for VBS to the thoracic and lumbosacral spine in growing children.
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Affiliation(s)
- Drosoula Giantsoudi
- Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts.
| | - Joao Seco
- Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Bree R Eaton
- Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - F Joseph Simeone
- Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Hanne Kooy
- Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Torunn I Yock
- Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Nancy J Tarbell
- Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Thomas F DeLaney
- Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Judith Adams
- Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Harald Paganetti
- Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Shannon M MacDonald
- Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
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MacEwan I, Chou B, Moretz J, Loredo L, Bush D, Slater JD. Effects of vertebral-body-sparing proton craniospinal irradiation on the spine of young pediatric patients with medulloblastoma. Adv Radiat Oncol 2017; 2:220-227. [PMID: 28740935 PMCID: PMC5514252 DOI: 10.1016/j.adro.2017.03.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 02/07/2017] [Accepted: 03/02/2017] [Indexed: 12/01/2022] Open
Abstract
Purpose To investigate the long-term effects of vertebral-body-sparing proton craniospinal irradiation (CSI) on the spine of young patients with medulloblastoma. Methods and materials Six children between the ages of 3 and 5 years with medulloblastoma were treated with vertebral-body-sparing proton CSI after maximal safe resection. Radiation therapy was delivered in the supine position with posterior beams targeting the craniospinal axis, and the proton beam was stopped anterior to the thecal sac. Patients were treated with a dose of either 23.4 Gy or 36 Gy to the craniospinal axis followed by a boost to the posterior fossa and any metastatic lesions. Chemotherapy varied by protocol. Radiographic effects on the spine were evaluated with serial imaging, either with magnetic resonance imaging scans or plain film using Cobb angle calculations, the presence of thoracic lordosis, lumbar vertebral body-to-disc height ratios, and anterior-posterior height ratios. Clinical outcomes were evaluated by patient/family interview and medical chart review. Results Overall survival and disease free survival were 83% (5/6) at follow-up. Median clinical and radiographic follow-up were 13.6 years and 12.3 years, respectively. Two patients were clinically diagnosed with scoliosis and treated conservatively. At the time of follow-up, no patients had experienced chronic back pain or required spine surgery. No patients were identified to have thoracic lordosis. Diminished growth of the posterior portions of vertebral bodies was identified in all patients, with an average posterior to anterior ratio of 0.88, which was accompanied by compensatory hypertrophy of the posterior intervertebral discs. Conclusion Vertebral-body-sparing CSI with proton beam did not appear to cause increased severe spinal abnormalities in patients treated at our institution. This approach could be considered in future clinical trials in an effort to reduce toxicity and the risk of secondary malignancy and to improve adult height.
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Affiliation(s)
- Iain MacEwan
- Loma Linda University Medical Center, Department of Radiation Medicine, Loma Linda, California
| | - Brian Chou
- Loma Linda University, School of Medicine, Loma Linda, California
| | - Jeremy Moretz
- Loma Linda University Medical Center, Department of Radiology, Loma Linda, California
| | - Lilia Loredo
- Loma Linda University Medical Center, Department of Radiation Medicine, Loma Linda, California
| | - David Bush
- Loma Linda University Medical Center, Department of Radiation Medicine, Loma Linda, California
| | - Jerry D Slater
- Loma Linda University Medical Center, Department of Radiation Medicine, Loma Linda, California
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26
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Ness KK, Hudson MM, Jones KE, Leisenring W, Yasui Y, Chen Y, Stovall M, Gibson TM, Green DM, Neglia JP, Henderson TO, Casillas J, Ford JS, Effinger KE, Krull KR, Armstrong GT, Robison LL, Oeffinger KC, Nathan PC. Effect of Temporal Changes in Therapeutic Exposure on Self-reported Health Status in Childhood Cancer Survivors. Ann Intern Med 2017; 166:89-98. [PMID: 27820947 PMCID: PMC5239750 DOI: 10.7326/m16-0742] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND The effect of temporal changes in cancer therapy on health status among childhood cancer survivors has not been evaluated. OBJECTIVE To compare proportions of self-reported adverse health status outcomes among childhood cancer survivors across 3 decades. DESIGN Cross-sectional. (ClinicalTrials.gov: NCT01120353). SETTING 27 North American institutions. PARTICIPANTS 14 566 adults, who survived for 5 or more years after initial diagnosis (median age, 27 years; range, 18 to 48 years), treated from 1970 to 1999. MEASUREMENTS Patient report of poor general or mental health, functional impairment, activity limitation, or cancer-related anxiety or pain was evaluated as a function of treatment decade, cancer treatment exposure, chronic health conditions, demographic characteristics, and health habits. RESULTS Despite reductions in late mortality and the proportions of survivors with severe, disabling, or life-threatening chronic health conditions (33.4% among those treated from 1970 to 1979 and 21.0% among those treated from 1990 to 1999), those reporting adverse health status did not decrease by treatment decade. Compared with survivors diagnosed in 1970 to 1979, those diagnosed in 1990 to 1999 were more likely to report poor general health (11.2% vs. 13.7%; P < 0.001) and cancer-related anxiety (13.3% vs. 15.0%; P < 0.001). From 1970 to 1979 and 1990 to 1999, the proportions of survivors reporting adverse outcomes were higher (P < 0.001) among those with leukemia (poor general health, 9.5% and 13.9%) and osteosarcoma (pain, 23.9% and 36.6%). Temporal changes in treatment exposures were not associated with changes in the proportions of survivors reporting adverse health status. Smoking, not meeting physical activity guidelines, and being either underweight or obese were associated with poor health status. LIMITATION Considerable improvement in survival among children diagnosed with cancer in the 1990s compared with those diagnosed in the 1970s makes it difficult to definitively determine the effect of risk factors on later self-reported health status without considering their effect on mortality. CONCLUSION Because survival rates after a diagnosis of childhood cancer have improved substantially over the past 30 years, the population of survivors now includes those who would have died in earlier decades. Self-reported health status among survivors has not improved despite evolution of treatment designed to reduce toxicities. PRIMARY FUNDING SOURCE The National Cancer Institute.
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Affiliation(s)
- Kirsten K Ness
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Melissa M Hudson
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Kendra E Jones
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Wendy Leisenring
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Yutaka Yasui
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Yan Chen
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Marilyn Stovall
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Todd M Gibson
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Daniel M Green
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Joseph P Neglia
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Tara O Henderson
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Jacqueline Casillas
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Jennifer S Ford
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Karen E Effinger
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Kevin R Krull
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Gregory T Armstrong
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Leslie L Robison
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Kevin C Oeffinger
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Paul C Nathan
- From St. Jude Children's Research Hospital, Memphis, Tennessee; Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Alberta, Edmonton, Alberta, Canada; The University of Texas MD Anderson Cancer Center, Houston, Texas; University of Minnesota Medical School, Minneapolis, Minnesota; University of Chicago, Chicago, Illinois; David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California; Memorial Sloan Kettering Cancer Center, New York, New York; Emory University, Atlanta, Georgia; and The Hospital for Sick Children, Toronto, Ontario, Canada
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Abstract
Medulloblastoma accounts for nearly 10% of all childhood brain tumors. These tumors occur exclusively in the posterior fossa and have the potential for leptomeningeal spread. Treatment includes a combination of surgery, radiation therapy (in patients >3 years old). Patients >3 years old are stratified based on the volume of postoperative residual tumor and the presence or absence of metastases into "standard risk" and "high risk" categories with long-term survival rates of approximately 85% and 70%, respectively. Outcomes are inferior in infants and children younger than 3 years with exception of those patients with the medulloblastoma with extensive nodularity histologic subtype. Treatment for medulloblastoma is associated with significant morbidity, especially in the youngest patients. Recent molecular subclassification of medulloblastoma has potential prognostic and therapeutic implications. Future incorporation of molecular subgroups into treatment protocols will hopefully improve both survival outcomes and posttreatment quality of life.
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Affiliation(s)
- Nathan E Millard
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Kevin C De Braganca
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
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28
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Yamashita H, Kase Y, Murayama S. Simplified estimation method for dose distributions around field junctions in proton craniospinal irradiation. Radiol Phys Technol 2016; 10:95-105. [PMID: 27586848 DOI: 10.1007/s12194-016-0373-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 08/18/2016] [Accepted: 08/22/2016] [Indexed: 11/30/2022]
Abstract
In radiotherapy involving craniospinal irradiation (CSI), field junctions of therapeutic beams are necessary, because a CSI target is generally several times larger than the maximum field size of the beams. The purpose of this study was to develop a simplified method for estimating dose uniformity around the field junctions in proton CSI. We estimated the dose profiles around the field junctions of proton beams using a simplified field-junction model, in which partial lateral dose distributions around the field edge were assumed to be approximated using the error function. We measured the lateral dose distributions of the proton beams planned for the CSI treatment using a two-dimensional (2D) ionization chamber array. Although dose hot spots and cold spots tend to be underestimated by a chamber array because of the partial volume effect of the sensitive volume and discrete chamber positions, the model estimation results were fairly consistent with the measurements obtained using a 2D chamber array subjected to CSI-simulated serial irradiation. The simplified junction model enabled us to estimate the dose distributions and dependence of the setup position gap on the dose uniformity around the field junctions on the basis of the field-by-field dose profiles measured using the 2D chamber array.
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Affiliation(s)
- Haruo Yamashita
- Proton Therapy Division, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Shizuoka, 411-8777, Japan. .,Proton Therapy Division, Shizuoka Cancer Center Research Institute, 1007 Shimonagakubo, Nagaizumi-cho, Shizuoka, 411-8777, Japan.
| | - Yuki Kase
- Proton Therapy Division, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Shizuoka, 411-8777, Japan.,Proton Therapy Division, Shizuoka Cancer Center Research Institute, 1007 Shimonagakubo, Nagaizumi-cho, Shizuoka, 411-8777, Japan
| | - Shigeyuki Murayama
- Proton Therapy Division, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Shizuoka, 411-8777, Japan.,Proton Therapy Division, Shizuoka Cancer Center Research Institute, 1007 Shimonagakubo, Nagaizumi-cho, Shizuoka, 411-8777, Japan
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29
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Jiang S, Wang J, Li H, Liao L, Li Y, Wang X, Yang Y, Zhu RX, Sahoo N, Gillin MT, Hojo Y, Sun J, Chang JY, Liao Z, Grosshans D, Frank SJ, Zhang X. Novel Hybrid Scattering- and Scanning-Beam Proton Therapy Approach. Int J Part Ther 2016; 3:37-50. [PMID: 31772974 DOI: 10.14338/ijpt-15-00014.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 04/14/2016] [Indexed: 11/21/2022] Open
Abstract
Purpose To determine whether a hybrid intensity-modulated proton therapy (IMPT) and passive scattered proton therapy (PSPT) technique, termed HimpsPT, could be adopted as an alternative delivery method for patients demanding scanning beam proton therapy. Patients and Methods We identified 3 representative clinical cases-an oropharyngeal cancer, skull base chordoma, and stage III non-small-cell lung cancer-that had been treated with IMPT at our center. We retrospectively redesigned these cases using HimpsPT. The PSPT plans for all three cases were designed with the same prescriptions as those used in the IMPT plans. In this way, the whole treatment was delivered using alternating or sequential PSPT and IMPT. Results All HimpsPT plans met the clinical dose criteria and were of similar quality as the IMPT plans. In the skull base case, the mixed plan was more effective at sparing the brain stem because the sharp penumbra of the aperture in the PSPT plans was not present in the IMPT plans. The HimpsPT plans were more robust than the clinical IMPT plans generated without robust optimization. Conclusion The HimpsPT delivery technique can achieve a treatment-plan quality similar to that of IMPT, even in the most challenging clinical cases. In addition, at centers equipped with both scattering and scanning beam capabilities, the HimpsPT technique may allow more patients to benefit from scanning beam technology.
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Affiliation(s)
- Shengpeng Jiang
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Department of Radiotherapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - Jingqian Wang
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Heng Li
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Li Liao
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Yupeng Li
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Department of Applied Research, Varian Medical Systems, Palo Alto, CA, USA
| | - Xiaochun Wang
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Yining Yang
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Department of Radiation Oncology, Tianjin First Center Hospital, Tianjin, China
| | - Ronald X Zhu
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Narayan Sahoo
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Michael T Gillin
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Yoshifumi Hojo
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jian Sun
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Department of Radiotherapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - Joe Y Chang
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Zhongxing Liao
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - David Grosshans
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Steven J Frank
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Xiaodong Zhang
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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Slater JD. Clinical Applications of Proton Radiation Treatment at Loma Linda University: Review of a Fifteen-year Experience. Technol Cancer Res Treat 2016; 5:81-9. [PMID: 16551128 DOI: 10.1177/153303460600500202] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Proton radiation therapy has been used at Loma Linda University Medical Center for 15 years, sometimes in combination with photon irradiation, surgery, and chemotherapy, but often as the sole modality. Our initial experience was based on established studies showing the utility of protons for certain management problems, but since then we have engaged in a planned program to exploit the capabilities of proton radiation and expand its applications in accordance with progressively accumulating clinical data. Our cumulative experience has confirmed that protons are a superb tool for delivering conformal radiation treatments, enabling delivery of effective doses of radiation and sparing normal tissues from radiation exposure.
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Affiliation(s)
- Jerry D Slater
- Department of Radiation Medicine, Loma Linda University, 11234 Anderson Street, Loma Linda, CA 92354, USA.
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Abstract
Of the many ionizing particles discovered so far, only a few are reasonable to consider for radiation therapy. These include photons, protons, neutrons, electrons, mesons, antiprotons, and ions heavier than hydrogen. Most of these particles are used therapeutically to destroy or inactivate malignant and sometimes benign cells. Since the late 1930s, accelerators have been developed that have expanded radiation oncologists' abilities to produce various ionizing particle beams. Over the past decade, radiation oncologists have become increasingly interested in pursuing particles other than the conventional photons that have been used almost exclusively since X-rays were discovered in 1895. Physicians recognize that normal-tissue morbidity from all forms of anti-cancer treatment is the primary factor limiting the success of those treatments. In radiation therapy, all particles mentioned above can destroy any cancer cell; controlling the beam in three dimensions, thus providing the physician with the capability of avoiding normal-tissue injury, is the fundamental deficiency in the use of X-rays (photons). Heavy charged particles possess near-ideal characteristics for exercising control in three dimensions; their primary differences are due to the number of protons contained within their nuclei. As their number of protons increase (atomic number) their ionization density (LET) increases. In selecting the optimal particle for therapy from among the heavy charged particles, one must carefully consider the ionization density created by each specific particle. Ionization density creates both advantages and disadvantages for patient treatment; these factors must be matched with the patients' precise clinical needs. The current state of the art involves studying the clinical advantages and disadvantages of the lightest ion, the proton, as compared to other particles used or contemplated for use. Full analysis must await adequate data developed from long-term studies to determine the precise role of each potential particle for human use. It is expected that one particle beam will emerge as the mainstream for treating human disease, and a small number of particles may emerge in an adjunctive role.
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Affiliation(s)
- James M Slater
- Department of Radiation Medicine, Loma Linda University, CSP A-1010, 11175 Campus Street, Loma Linda, CA 92354, USA.
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Howell RM, Burgett EA, Isaacs D, Price Hedrick SG, Reilly MP, Rankine LJ, Grantham KK, Perkins S, Klein EE. Measured Neutron Spectra and Dose Equivalents From a Mevion Single-Room, Passively Scattered Proton System Used for Craniospinal Irradiation. Int J Radiat Oncol Biol Phys 2016; 95:249-257. [DOI: 10.1016/j.ijrobp.2015.12.356] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Revised: 11/19/2015] [Accepted: 12/14/2015] [Indexed: 11/30/2022]
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Miljković MD, Grossman SA, Ye X, Ellsworth S, Terezakis S. Patterns of Radiation-Associated Lymphopenia in Children with Cancer. Cancer Invest 2016; 34:32-8. [PMID: 26745229 DOI: 10.3109/07357907.2015.1086366] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Adults with cancer commonly develop severe lymphopenia two months following chemoradiation therapy, which is an independent predictor of survival. In this retrospective study of 53 children with central nervous system tumors and sarcomas, the frequency, severity, and duration of radiation-associated lymphopenia was similar to that seen in adults. Pretreatment lymphocyte counts were 1,000 cells/mm(3) or greater in all patients, with 66% experiencing grade III-IV lymphopenia two months after chemoradiation. Lymphocyte counts remained significantly lower than baseline 12 months later. Further studies are needed to determine if this is also associated with poorer survival, as seen in adults.
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Affiliation(s)
- Miloš D Miljković
- a Medical Oncology Service , National Cancer Institute , Bethesda , Maryland , USA
| | | | | | - Susannah Ellsworth
- c Department of Radiation Oncology , Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins , Baltimore , Maryland , USA
| | - Stephanie Terezakis
- c Department of Radiation Oncology , Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins , Baltimore , Maryland , USA
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Abstract
Embryonal brain tumors are a heterogeneous group of neoplasms that primarily occur in infants and young children. They are highly cellular tumors with brisk mitotic activity, and they share a propensity for dissemination throughout the neuroaxis. Emerging molecular data enable improved diagnostic and prognostic discrimination for these tumors. Because of their aggressive potential, they are treated similarly with multimodality therapy including maximal safe resection, chemotherapy, and age- and risk-adapted radiotherapy. Craniospinal irradiation is commonly used in the treatment of these patients, especially in those older than 3 years. Because proton therapy allows for increased sparing of the anterior structures in craniospinal irradiation, there is a particular interest in using proton therapy to treat these young patients. For very young patients treated with focal fields only, proton therapy also decreases unnecessary radiation exposure to uninvolved intracranial structures. It is hoped that the use of proton therapy for these vulnerable patients will translate into decreased long-term neurocognitive, endocrine, vascular, and developmental effects, in addition to a decreased risk of second malignancies. This review describes the role of radiation in general and proton therapy in particular for the treatment of medulloblastoma, central nervous system primitive neuroectodermal tumors, atypical teratoid/rhabdoid tumors, and the recently described embryonal tumor with multilayered rosettes.
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Abstract
OPINION STATEMENT Approximately 70 % of newly diagnosed children with medulloblastoma (MB) will be classified as "standard risk": their tumor is localized to the posterior fossa, they undergo a near or gross total resection, the tumor does not meet the criteria for large cell/anaplastic histology, and there is no evidence of neuroaxis dissemination by brain/spine MRI and lumbar puncture for cytopathology. Following surgical recovery, they are treated with craniospinal radiation therapy with a boost to the posterior fossa or tumor bed. Adjuvant therapy for approximately 1 year follows anchored by the use of alkylators, platinators, and microtubule inhibitors. This approach to standard risk MB works; greater than 80 % of patients will be cured, and such approaches are arguably the standard of care worldwide for such children. Despite this success, some children with standard risk features will relapse and die of recurrent disease despite aggressive salvage therapy. Moreover, current treatment, even when curative causes life-long morbidity in those who survive, and the consequences are age dependent. For the 20-year-old patient, damage to the cerebellum from surgery conveys greater risk than craniospinal radiation; however, for the 3-year-old patient, the opposite is true. The challenge for the neuro-oncologist today is how to identify accurately patients who need less therapy as well as those for whom current therapy is inadequate. As molecular diagnostics comes of age in brain tumors, the question becomes how to best implement novel methods of risk stratification. Are we able to obtain specific information about the tumor's biology in an increasingly rapid and reliable way, and utilize these findings in the upfront management of these tumors? Precision medicine should allow us to tailor therapy to the specific drivers of each patient's tumor. Regardless of how new approaches are implemented, it is likely that we will no longer be able to have a single standard approach to standard risk medulloblastoma in the near future.
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Lin H, Ding X, Kirk M, Liu H, Zhai H, Hill-Kayser CE, Lustig RA, Tochner Z, Both S, McDonough J. Supine Craniospinal Irradiation Using a Proton Pencil Beam Scanning Technique Without Match Line Changes for Field Junctions. Int J Radiat Oncol Biol Phys 2014; 90:71-8. [DOI: 10.1016/j.ijrobp.2014.05.029] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 05/19/2014] [Accepted: 05/22/2014] [Indexed: 10/25/2022]
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Song S, Park HJ, Yoon JH, Kim DW, Park J, Shin D, Shin SH, Kang HJ, Kim SK, Phi JH, Kim JY. Proton beam therapy reduces the incidence of acute haematological and gastrointestinal toxicities associated with craniospinal irradiation in pediatric brain tumors. Acta Oncol 2014; 53:1158-64. [PMID: 24913151 DOI: 10.3109/0284186x.2014.887225] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND The benefits of proton beam craniospinal irradiation (PrBCSI) in children have been extensively reported in dosimetric studies. However, there is limited clinical evidence supporting the use of PrBCSI. We compared the acute toxicity of PrBCSI relative to that of conventional photon beam CSI (PhBCSI) in children with brain tumours. MATERIAL AND METHODS We prospectively evaluated the haematological and gastrointestinal toxicities in 30 patients who underwent PrBCSI between April 2008 and December 2012. As a reference group, we retrospectively evaluated the medical records of 13 patients who underwent PhBCSI between April 2003 and April 2012. The median follow-up time from starting CSI was 22 months (range 2-118 months). The mean irradiation dose was 32.1 Gy (range 23.4-39.6 Gy) and 29.4 CGE (cobalt grey equivalents; range 19.8-39.6), in the PrBCSI and PhBCSI groups, respectively (p = 0.236). RESULTS There was no craniospinal fluid space relapse after curative therapy in either group of patients. Thrombocytopenia was less severe in the PrBCSI group than in the PhBCSI group (p = 0.012). The recovery rates of leukocyte and platelet counts measured one month after treatment were significantly greater in the PrBCSI group than in the PhBCSI group (p = 0.003 and p = 0.010, respectively). Diarrhoea was reported by 23% of patients in the PhBCSI group versus none in the PrBCSI group (p = 0.023). CONCLUSIONS The incidence rates of thrombocytopenia and diarrhoea were lower in the PrBCSI group than in the PhBCSI group. One month after completing treatment, the recovery from leukopenia and thrombocytopenia was better in patients treated with PrBCSI than in those treated with PhBCSI.
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Affiliation(s)
- Sanghyuk Song
- Proton Therapy Center, Research Institute and Hospital, National Cancer Center , Seoul , Korea
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Chang AL, Yock TI, Mahajan A, Hill-Kaiser C, Keole S, Loredo L, Cahlon O, McMullen KP, Hartsell W, Indelicato DJ. Pediatric Proton Therapy: Patterns of Care across the United States. Int J Part Ther 2014. [DOI: 10.14338/ijpt.13.00009.1] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Mansur DB. Incorporating a compact proton therapy unit into an existing National Cancer Institute-designated comprehensive cancer center. Expert Rev Anticancer Ther 2014; 14:1001-5. [DOI: 10.1586/14737140.2014.948857] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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DeSouza RM, Jones BRT, Lowis SP, Kurian KM. Pediatric medulloblastoma - update on molecular classification driving targeted therapies. Front Oncol 2014; 4:176. [PMID: 25101241 PMCID: PMC4105823 DOI: 10.3389/fonc.2014.00176] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Accepted: 06/23/2014] [Indexed: 01/07/2023] Open
Abstract
As advances in the molecular and genetic profiling of pediatric medulloblastoma evolve, associations with prognosis and treatment are found (prognostic and predictive biomarkers) and research is directed at molecular therapies. Medulloblastoma typically affects young patients, where the implications of any treatment on the developing brain must be carefully considered. The aim of this article is to provide a clear comprehensible update on the role molecular profiling and subgroups in pediatric medulloblastoma as it is likely to contribute significantly toward prognostication. Knowledge of this classification is of particular interest because there are new molecular therapies targeting the Shh subgroup of medulloblastomas.
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Affiliation(s)
| | | | | | - Kathreena M Kurian
- Brain Tumour Group, Institute of Clinical Neuroscience, University of Bristol , Bristol , UK
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Abstract
Proton therapy is a novel technique for treating pediatric malignancies. As a tool to reduce normal-tissue dose, it has the potential to decrease late toxicity. Although proton therapy has been used for over five decades, most pediatric dosimetry studies and clinical series have been published over the last 10 years. The purpose of this article is to review the physical, radiobiological and economic rationales for proton therapy in pediatric CNS malignancies, and provide an overview of the current challenges and future direction of research and utilization of this approach.
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Affiliation(s)
- Radhika Sreeraman
- Department of Radiation Oncology, H Lee Moffitt Cancer Center & Research Institute, Tampa, FL, USA
| | - Daniel J Indelicato
- University of Florida Proton Therapy Institute, 2015 North Jefferson Street, Jacksonville, FL 32206, USA
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44
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Barney CL, Brown AP, Grosshans DR, McAleer MF, de Groot JF, Puduvalli V, Tucker SL, Crawford CN, Gilbert MR, Brown PD, Mahajan A. Technique, outcomes, and acute toxicities in adults treated with proton beam craniospinal irradiation. Neuro Oncol 2013; 16:303-9. [PMID: 24311638 DOI: 10.1093/neuonc/not155] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND Proton craniospinal irradiation (p-CSI) has been proposed to reduce side effects associated with CSI. We evaluated acute toxicities and preliminary clinical outcomes in a series of adults treated with p-CSI. METHODS We reviewed medical records for 50 patients (aged 16-63 y) with malignancies of varying histologies treated consecutively with vertebral body-sparing p-CSI at MD Anderson Cancer Center from 2007 to 2011. Median CSI and total boost doses were 30.6 and 54 Gy. Forty patients received chemotherapy, varying by histology. Median follow-up was 20.1 months (range, 0.3-59). RESULTS Median doses to the thyroid gland, pituitary gland, hypothalamus, and cochleae were 0.003 Gy-relative biological effectiveness (RBE; range, 0.001-8.5), 36.1 Gy-RBE (22.5-53.0), 37.1 Gy-RBE (22.3-54.4), and 33.9 Gy-RBE (22.2-52.4), respectively. Median percent weight loss during CSI was 1.6% (range, 10% weight loss to 14% weight gain). Mild nausea/vomiting was common (grade 1 = 46%, grade 2 = 20%); however, only 5 patients experienced grade ≥2 anorexia (weight loss >5% baseline weight). Median percent baseline white blood cells, hemoglobin, and platelets at nadir were 52% (range, 13%-100%), 97% (65%-112%), and 61% (10%-270%), respectively. Four patients developed grade ≥3 cytopenias. Overall and progression-free survival rates were 96% and 82%, respectively, at 2 years and 84% and 68% at 5 years. CONCLUSIONS This large series of patients treated with p-CSI confirms low rates of acute toxicity, consistent with dosimetric models. Vertebral body-sparing p-CSI is feasible and should be considered as a way to reduce acute gastrointestinal and hematologic toxicity in adults requiring CSI.
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Affiliation(s)
- Christian L Barney
- Corresponding Author: Anita Mahajan, MD, Department of Radiation Oncology, Unit 97, MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030.
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Chawla S, Wang S, Kim S, Sheriff S, Lee P, Rengan R, Lin A, Melhem E, Maudsley A, Poptani H. Radiation Injury to the Normal Brain Measured by 3D-Echo-Planar Spectroscopic Imaging and Diffusion Tensor Imaging: Initial Experience. J Neuroimaging 2013; 25:97-104. [DOI: 10.1111/jon.12070] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 07/08/2013] [Accepted: 08/03/2013] [Indexed: 12/14/2022] Open
Affiliation(s)
- Sanjeev Chawla
- Department of Radiology; University of Pennsylvania; Philadelphia PA
| | - Sumei Wang
- Department of Radiology; University of Pennsylvania; Philadelphia PA
| | - Sungheon Kim
- Department of Radiology; New York University; New York NY
| | | | - Peter Lee
- Department of Radiology; University of Pennsylvania; Philadelphia PA
| | - Ramesh Rengan
- Department of Radiation Oncology; University of Pennsylvania; Philadelphia PA
| | - Alexander Lin
- Department of Radiation Oncology; University of Pennsylvania; Philadelphia PA
| | - Elias Melhem
- Department of Radiology; University of Pennsylvania; Philadelphia PA
| | | | - Harish Poptani
- Department of Radiology; University of Pennsylvania; Philadelphia PA
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46
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Habrand JL, Datchary J, Alapetite C, Bolle S, Calugaru V, Feuvret L, Helfre S, Stefan D, Delacroix S, Demarzi L, Dendale R. Évolution des indications cliniques en hadronthérapie 2008–2012. Cancer Radiother 2013; 17:400-6. [DOI: 10.1016/j.canrad.2013.07.141] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Accepted: 07/16/2013] [Indexed: 12/25/2022]
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Treatment Options for Medulloblastoma and CNS Primitive Neuroectodermal Tumor (PNET). Curr Treat Options Neurol 2013; 15:593-606. [PMID: 23979905 DOI: 10.1007/s11940-013-0255-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
OPINION STATEMENT Medulloblastoma and central nervous system (CNS) primitive neuroectodermal tumor (PNET) are primary pediatric brain tumors that require multidisciplinary therapies. Although often treated similarly in clinical trials, they are biologically different diseases. Even within medulloblastomas and CNS PNETs, there are molecularly distinct subgroups with differing presentations and prognoses. Overall, prognosis is better for medulloblastomas. Specific treatments for these types of cancer are continuously evolving to maximize survival and minimize long-term sequelae of treatment. Patients should be treated on a clinical trial, if eligible, as they may gain benefit with minimal risk over current standard of care. The amount of residual disease after surgery better correlates with survival for medulloblastomas than for CNS PNETs. Maximal surgical resection of tumor should be done, only if additional permanent, neurologic deficits can be spared. Patients should have a staging work-up to assess the extent of disease. This includes postoperative magnetic resonance imaging (MRI) of the brain, MRI of the entire spine and lumbar cerebrospinal fluid (CSF) sampling for cytological examination, if deemed safe. Radiation therapy to the entire CNS axis is required, with a greater dose (boost) given to the region of the primary site or any bulky residual disease for older children. Adjuvant chemotherapy must be given even if no evidence of disease after radiation therapy exists, as the risk of relapse is substantial after radiation alone. Subsets of younger children with medulloblastoma, arbitrarily defined as those younger than 3 years of age in some studies and 4 or even 5 years in other studies, can be effectively treated with chemotherapy alone. Recent genomic studies have revealed further subtypes of disease than previously recognized. Clinical trials to exploit these biologic differences are required to assess potential efficacy of targeted agents. The treatment of medulloblastoma and CNS PNET can cause significant impairment in neurologic function. Evaluations by physical therapy, occupational therapy, speech therapy and neurocognitive assessments should be obtained, as needed. After therapy is completed, survivors need follow-up of endocrine function, surveillance scans and psychosocial support.
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Suneja G, Poorvu PD, Hill-Kayser C, Lustig RA. Acute toxicity of proton beam radiation for pediatric central nervous system malignancies. Pediatr Blood Cancer 2013; 60:1431-6. [PMID: 23610011 DOI: 10.1002/pbc.24554] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Accepted: 03/08/2013] [Indexed: 11/10/2022]
Abstract
BACKGROUND Proton beam therapy (PBT) for pediatric CNS malignancies may reduce late toxicity, but acute toxicity is not well defined. We examined acute toxicity for children with CNS malignancies treated with PBT. PROCEDURE We conducted a retrospective review of 48 children with malignant brain tumors treated with PBT at our facility from 2010 to 2012. For each patient, we recorded age at diagnosis, tumor location, histologic subtype, radiation dose, extent of radiation, and use of concurrent chemotherapy. Acute toxicity scores were recorded per the National Cancer Institute Common Terminology Criteria for Adverse Events version 4.0 at weekly on treatment visits. Maximum grade of fatigue, headache, insomnia, anorexia, nausea, vomiting, alopecia, and dermatitis over the radiation therapy treatment course were recorded, and rates of acute toxicity were calculated. RESULTS The cohort consisted of 16 glial tumors, 9 medulloblastomas, 6 germinomas, 5 ependymomas, 4 craniopharyngiomas, 3 atypical teratoid rhabdoid tumors, and 5 other CNS tumors. The mean age was 10.8 years, and median dose was 5,400 cGy (RBE). Acute toxicities were generally low-grade and manageable. The most commonly observed acute toxicities were fatigue, alopecia, and dermatitis. The least common were insomnia and vomiting. Higher maximum grades for headache, nausea, and vomiting over the treatment course were associated with infratentorial location, while higher maximum grades for anorexia, nausea, and alopecia were associated with craniospinal radiation. CONCLUSIONS PBT appears to be well tolerated in pediatric patients with CNS malignancies. Acute toxicity can be managed with supportive care.
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Affiliation(s)
- Gita Suneja
- Department of Radiation Oncology, The University of Pennsylvania, Philadelphia, Pennsylvania, USA.
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Hill PM, Klein EE, Bloch C. Optimizing field patching in passively scattered proton therapy with the use of beam current modulation. Phys Med Biol 2013; 58:5527-39. [DOI: 10.1088/0031-9155/58/16/5527] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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50
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Cheng CW, Das IJ, Srivastava SP, Zhao L, Wolanski M, Simmons J, Johnstone PA, Buchsbaum JC. Dosimetric comparison between proton and photon beams in the moving gap region in cranio-spinal irradiation (CSI). Acta Oncol 2013; 52:553-60. [PMID: 22554342 DOI: 10.3109/0284186x.2012.681065] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE To investigate the moving gap region dosimetry in proton beam cranio-spinal irradiation (CSI) to provide optimal dose uniformity across the treatment volume. MATERIAL AND METHODS Proton beams of ranges 11.6 cm and 16 cm are used for the spine and the brain fields, respectively. Beam profiles for a 30 cm snout are first matched at the 50% level (hot match) on the computer. Feathering is simulated by shifting the dose profiles by a known distance two successive times to simulate a 2 × feathering scheme. The process is repeated for 2 mm and 4 mm gaps. Similar procedures are used to determine the dose profiles in the moving gap for a series of gap widths, 0-10 mm, and feathering step sizes, 4-10 mm, for a Varian iX 6MV beam. The proton and photon dose profiles in the moving gap region are compared. RESULTS The dose profiles in the moving gap exhibit valleys and peaks in both proton and photon beam CSI. The dose in the moving gap for protons is around 100% or higher for 0 mm gap, for both 5 and 10 mm feathering step sizes. When the field gap is comparable or larger than the penumbra, dose minima as low as 66% is obtained. The dosimetric characteristics for 6 MV photon beams can be made similar to those of the protons by appropriately combining gap width and feathering step size. CONCLUSION The dose in the moving gap region is determined by the lateral penumbras, the width of the gap and the feathering step size. The dose decreases with increasing gap width or decreasing feathering step size. The dosimetric characteristics are similar for photon and proton beams. However, proton CSI has virtually no exit dose and is beneficial for pediatric patients, whereas with photon beams the whole lung and abdomen receive non-negligible exit dose.
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Affiliation(s)
- Chee-Wai Cheng
- IU Health Proton Therapy Center,
Bloomington, Indiana, USA
- Department of Radiation Oncology, Indiana University School of Medicine,
Indianapolis, Indiana, USA
| | - Indra J. Das
- IU Health Proton Therapy Center,
Bloomington, Indiana, USA
- Department of Radiation Oncology, Indiana University School of Medicine,
Indianapolis, Indiana, USA
| | - Shiv P. Srivastava
- Department of Radiation Oncology, Indiana University School of Medicine,
Indianapolis, Indiana, USA
- Department of Radiation Oncology, Reid Hospital,
Richmond, IN
| | - Li Zhao
- IU Health Proton Therapy Center,
Bloomington, Indiana, USA
- Department of Radiation Oncology, Indiana University School of Medicine,
Indianapolis, Indiana, USA
| | - Mark Wolanski
- IU Health Proton Therapy Center,
Bloomington, Indiana, USA
- Department of Radiation Oncology, Indiana University School of Medicine,
Indianapolis, Indiana, USA
| | - Joseph Simmons
- IU Health Proton Therapy Center,
Bloomington, Indiana, USA
| | - Peter A.S. Johnstone
- IU Health Proton Therapy Center,
Bloomington, Indiana, USA
- Department of Radiation Oncology, Indiana University School of Medicine,
Indianapolis, Indiana, USA
| | - Jeffrey C. Buchsbaum
- IU Health Proton Therapy Center,
Bloomington, Indiana, USA
- Department of Radiation Oncology, Indiana University School of Medicine,
Indianapolis, Indiana, USA
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