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Palacio Giraldo A, Sohm D, Neugebauer J, Leone G, Bergovec M, Dammerer D. Stereotactic Radiosurgery in Metastatic Spine Disease-A Systemic Review of the Literature. Cancers (Basel) 2024; 16:2787. [PMID: 39199560 PMCID: PMC11352806 DOI: 10.3390/cancers16162787] [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: 07/02/2024] [Revised: 08/01/2024] [Accepted: 08/03/2024] [Indexed: 09/01/2024] Open
Abstract
BACKGROUND This study investigated the efficacy of stereotactic radiosurgery (SRS) in managing spinal metastasis. Traditionally, surgery was the primary approach, but SRS has emerged as a promising alternative. OBJECTIVE The study aims to evaluate the efficacy of stereotactic radiosurgery in the management of spinal metastasis in terms of local tumor control, patient survival, and quality of life, identifying both advantages and limitations of SRS. METHODS Through an extensive literature search in PubMed with cross-referencing, relevant full-text-available papers published between 2012 and 2022 in English or German were included. The search string used was "metastatic spine diseases AND SRS OR stereotactic radiosurgery". RESULTS There is growing evidence of SRS as a precise and effective treatment. SRS delivers high radiation doses while minimizing exposure to critical neural structures, offering benefits like pain relief, limited tumor growth, and a low complication rate, even for tumors resistant to traditional radiation therapies. SRS can be a primary treatment for certain metastatic cases, particularly those without spinal cord compression. CONCLUSIONS SRS appears to be a preferable option for oligometastasis and radioresistant lesions, assuming there are no contraindications. Further research is necessary to refine treatment protocols, determine optimal radiation dose and fractionation schemes, and assess the long-term effects of SRS on neural structures.
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Affiliation(s)
- Adriana Palacio Giraldo
- Department for Orthopedics and Traumatology, Karl Landsteiner University of Health Sciences, Dr. Karl-Dorrek-Straße 30, 3500 Krems, Austria
- Division of Orthopaedics and Traumatology, University Hospital Krems, Mitterweg 10, 3500 Krems, Austria
| | - David Sohm
- Department for Orthopedics and Traumatology, Karl Landsteiner University of Health Sciences, Dr. Karl-Dorrek-Straße 30, 3500 Krems, Austria
| | - Johannes Neugebauer
- Department for Orthopedics and Traumatology, Karl Landsteiner University of Health Sciences, Dr. Karl-Dorrek-Straße 30, 3500 Krems, Austria
- Division of Orthopaedics and Traumatology, University Hospital Krems, Mitterweg 10, 3500 Krems, Austria
| | - Gianpaolo Leone
- Department for Orthopedics and Traumatology, Karl Landsteiner University of Health Sciences, Dr. Karl-Dorrek-Straße 30, 3500 Krems, Austria
- Division of Orthopaedics and Traumatology, University Hospital Krems, Mitterweg 10, 3500 Krems, Austria
| | - Marko Bergovec
- Department for Orthopedics and Traumatology, Karl Landsteiner University of Health Sciences, Dr. Karl-Dorrek-Straße 30, 3500 Krems, Austria
- Division of Orthopaedics and Traumatology, University Hospital Krems, Mitterweg 10, 3500 Krems, Austria
| | - Dietmar Dammerer
- Department for Orthopedics and Traumatology, Karl Landsteiner University of Health Sciences, Dr. Karl-Dorrek-Straße 30, 3500 Krems, Austria
- Division of Orthopaedics and Traumatology, University Hospital Krems, Mitterweg 10, 3500 Krems, Austria
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Kumawat C, Takahashi T, Date I, Tomita Y, Tanaka M, Arataki S, Komatsubara T, Flores AOP, Yu D, Jain M. State-of-the-Art and New Treatment Approaches for Spinal Cord Tumors. Cancers (Basel) 2024; 16:2360. [PMID: 39001422 PMCID: PMC11240441 DOI: 10.3390/cancers16132360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 06/19/2024] [Accepted: 06/24/2024] [Indexed: 07/16/2024] Open
Abstract
Spinal cord tumors, though rare, present formidable challenges in clinical management due to their intricate nature. Traditional treatment modalities like surgery, radiation therapy, and chemotherapy have been the mainstay for managing these tumors. However, despite significant advancements, challenges persist, including the limitations of surgical resection and the potential side effects associated with radiation therapy. In response to these limitations, a wave of innovative approaches is reshaping the treatment landscape for spinal cord tumors. Advancements in gene therapy, immunotherapy, and targeted therapy are offering groundbreaking possibilities. Gene therapy holds the potential to modify the genes responsible for tumor growth, while immunotherapy harnesses the body's own immune system to fight cancer cells. Targeted therapy aims to strike a specific vulnerability within the tumor cells, offering a more precise and potentially less toxic approach. Additionally, novel surgical adjuncts are being explored to improve visualization and minimize damage to surrounding healthy tissue during tumor removal. These developments pave the way for a future of personalized medicine for spinal cord tumors. By delving deeper into the molecular makeup of individual tumors, doctors can tailor treatment strategies to target specific mutations and vulnerabilities. This personalized approach offers the potential for more effective interventions with fewer side effects, ultimately leading to improved patient outcomes and a better quality of life. This evolving landscape of spinal cord tumor management signifies the crucial integration of established and innovative strategies to create a brighter future for patients battling this complex condition.
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Affiliation(s)
- Chetan Kumawat
- Department of Orthopedic Surgery, Okayama Rosai Hospital, 1-10-25 Chikkomidorimachi, Minami Ward Okayama, Okayama 702-8055, Japan
- Department of Orthopedic Surgery, Sir Ganga Ram Hospital, Rajinder Nagar, New Delhi 110060, India
| | - Toshiyuki Takahashi
- Spinal Disorder Center, Fujieda Heisei Memorial Hospital, 123-1 Mizuue Fujieda, Shizuoka 426-8662, Japan
| | - Isao Date
- Department of Neurosurgery, Okayama Rosai Hospital, 1-10-25 Chikkomidorimachi, Minami Ward Okayama, Okayama 702-8055, Japan
| | - Yousuke Tomita
- Department of Neurosurgery, Okayama Rosai Hospital, 1-10-25 Chikkomidorimachi, Minami Ward Okayama, Okayama 702-8055, Japan
| | - Masato Tanaka
- Department of Orthopedic Surgery, Okayama Rosai Hospital, 1-10-25 Chikkomidorimachi, Minami Ward Okayama, Okayama 702-8055, Japan
| | - Shinya Arataki
- Department of Orthopedic Surgery, Okayama Rosai Hospital, 1-10-25 Chikkomidorimachi, Minami Ward Okayama, Okayama 702-8055, Japan
| | - Tadashi Komatsubara
- Department of Orthopedic Surgery, Okayama Rosai Hospital, 1-10-25 Chikkomidorimachi, Minami Ward Okayama, Okayama 702-8055, Japan
| | - Angel O P Flores
- Department of Orthopedic Surgery, Okayama Rosai Hospital, 1-10-25 Chikkomidorimachi, Minami Ward Okayama, Okayama 702-8055, Japan
| | - Dongwoo Yu
- Department of Orthopedic Surgery, Okayama Rosai Hospital, 1-10-25 Chikkomidorimachi, Minami Ward Okayama, Okayama 702-8055, Japan
| | - Mukul Jain
- Department of Orthopedic Surgery, Okayama Rosai Hospital, 1-10-25 Chikkomidorimachi, Minami Ward Okayama, Okayama 702-8055, Japan
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Amadasu E, Panther E, Lucke-Wold B. Characterization and Treatment of Spinal Tumors. INTENSIVE CARE RESEARCH 2022; 2:76-95. [PMID: 36741203 PMCID: PMC9893847 DOI: 10.1007/s44231-022-00014-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 09/03/2022] [Indexed: 02/07/2023]
Abstract
The prevalence of spinal tumors is rare in comparison to brain tumors which encompass most central nervous system tumors. Tumors of the spine can be divided into primary and metastatic tumors with the latter being the most common presentation. Primary tumors are subdivided based on their location on the spinal column and in the spinal cord into intramedullary, intradural extramedullary, and primary bone tumors. Back pain is a common presentation in spine cancer patients; however, other radicular pain may be present. Magnetic resonance imaging (MRI) is the imaging modality of choice for intradural extramedullary and intramedullary tumors. Plain radiographs are used in the initial diagnosis of primary bone tumors while Computed tomography (CT) and MRI may often be necessary for further characterization. Complete surgical resection is the treatment of choice for spinal tumors and may be curative for well circumscribed lesions. However, intralesional resection along with adjuvant radiation and chemotherapy can be indicated for patients that would experience increased morbidity from damage to nearby neurological structures caused by resection with wide margins. Even with the current treatment options, the prognosis for aggressive spinal cancer remains poor. Advances in novel treatments including molecular targeting, immunotherapy and stem cell therapy provide the potential for greater control of malignant and metastatic tumors of the spine.
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Affiliation(s)
- Efosa Amadasu
- School of Medicine, University of South Florida, Tampa, USA
| | - Eric Panther
- Department of Neurosurgery, University of Florida, Gainesville, USA
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4
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Kaprovoy SV, Konovalov NA, Onoprienko RA, Stepanov IA. [Benign extramedullary spinal cord tumors at the level of craniovertebral junction: a systematic review]. ZHURNAL VOPROSY NEIROKHIRURGII IMENI N. N. BURDENKO 2022; 86:96-103. [PMID: 35942843 DOI: 10.17116/neiro20228604196] [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: 06/15/2023]
Abstract
Extramedullary spinal cord tumors at the level of craniovertebral junction are a rare group of neoplasms with their own characteristics. Taking into account the peculiarities of clinical course and complex anatomy of craniovertebral complex, these tumors present a complex diagnostic and surgical problem. A systematic review of literature data on epidemiology, clinical picture, diagnostic methods and dorsal minimally invasive methods of surgical treatment of patients with extramedullary spinal cord tumors of craniovertebral junction was performed.
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Affiliation(s)
| | | | | | - I A Stepanov
- Irkutsk State Medical University, Irkutsk, Russia
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Singh PR, Pandey TK, Sharma RK, Ahmad F, Kumar A, Agarwal A. Tumor Occupancy Ratio-An Imaging Characteristic Prognosticating the Surgical Outcome of Benign Intradural Extramedullary Spinal Cord Tumors. Int J Spine Surg 2021; 15:570-576. [PMID: 33963026 DOI: 10.14444/8077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Intradural extramedullary (IDEM) spinal cord tumors are two thirds of all spinal tumors. We have prospectively analyzed the importance of the tumor occupancy ratio as a factor for predicting the course of the disease and in prognosticating the surgical outcome in patients with IDEM tumors. METHODS We prospectively analyzed 44 consecutive cases of IDEM tumors, diagnosed as cervical, thoracic, and lumbar IDEM tumors (excluding conus/cauda equina lesion) by magnetic resonance imaging (MRI), that were operated on at our institution between 2014 and 2016. We measured the tumor occupancy ratio and noted the sagittal and axial location of the tumor in the preoperative MRI and performed the laminectomy and unilateral medial facetectomy. A primary outcome has been noted according to the gait disability score in the preoperative period and in the follow-up period of 1 year. In the statistical analysis, categorical variables were compared using a chi-square test, and an analysis of variance and student t tests were used for the continuous variables. P < .05 was considered statistically significant. RESULTS The tumor occupancy ratio showed a significant association to the preoperative gait disability score (P < .001) and also predicted that the surgical outcome is much better in patients with tumors with a low tumor occupancy ratio than in patients with tumors with a high occupancy ratio (P < .001). No difference in the tumor occupancy ratio was noted in 2 different pathological tumors, and there was also no difference in the tumor occupancy ratio at different sagittal and axial locations of the tumor. CONCLUSION Tumor occupancy ratio has shown a significant impact on the preoperative course and also predicts the surgical outcome in patients with IDEM tumors. Hence, it is an important imaging characteristic to prognosticate the outcome in IDEM tumors and should be noted in each case.
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Affiliation(s)
- Prashant Raj Singh
- Department of Neurosurgery, All India Institute of Medical Sciences, Raipur, India
| | - Tarun Kumar Pandey
- Department of Neurosurgery, Vivekananda Polyclinic and Institute of Medical Sciences, Lucknow, India
| | | | - Faran Ahmad
- Department of Neurosurgery, Vivekananda Polyclinic and Institute of Medical Sciences, Lucknow, India
| | - Ankur Kumar
- Department of Neurosurgery, Vivekananda Polyclinic and Institute of Medical Sciences, Lucknow, India
| | - Abhay Agarwal
- Department of Neurosurgery, Vivekananda Polyclinic and Institute of Medical Sciences, Lucknow, India
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Slouma M, Rahmouni S, Dhahri R, Khayati Y, Zriba S, Amorri W, Gharsallah I, Metoui L, Louzir B. Epidural myeloid sarcoma as the presenting symptom of chronic myeloid leukemia blast crisis. Clin Rheumatol 2020; 39:2453-2459. [PMID: 32458246 DOI: 10.1007/s10067-020-05167-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/05/2020] [Accepted: 05/11/2020] [Indexed: 02/03/2023]
Abstract
Epidural myeloid sarcoma revealing chronic myeloid leukemia is scarce. Herein, we describe a patient that presented with back pain and bilateral sciatica secondary to root compression due to epidural deposition of leukemic cells. The magnetic resonance imaging showed epidural masses, causing a slight restriction of the spinal canal with bilateral L5 root compression. Laboratory examinations showed hyperleukocytosis (white blood cell count: 83 × 109/L, absolute neutrophil count: 60 × 109/L). The bone marrow cytology and immunophenotypic findings confirmed the diagnosis of myeloid leukemia. The diagnosis of spinal myeloid sarcoma revealing chronic myeloid leukemia during the blast phase was established. The patient underwent induction chemotherapy. Then, bone marrow cytology revealed less than 3% of blasts, which correspond to cytological remission. Three months later, MRI showed complete disappearance of the epidural masses. A literature review was conducted by searching PubMed using these terms: "Leukemia, Myeloid" AND "Spine" AND "Sarcoma, Myeloid". We emphasize clinical and radiological findings of spinal myeloid sarcoma. This diagnosis should be considered when the MRI reveals epidural mass lesion. The early management of this disease is necessary, and the treatment of myeloid sarcoma is not codified. Our case highlighted that chemotherapy treatment could be sufficient to lead to the disappearance of myeloid sarcoma and the remission of leukemia.
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Affiliation(s)
- Maroua Slouma
- Department of Internal Medicine, Military Hospital, Tunis El Manar University, Tunis, Tunisia.
| | - Safa Rahmouni
- Department of Internal Medicine, Military Hospital, Tunis El Manar University, Tunis, Tunisia
| | - Rim Dhahri
- Department of Internal Medicine, Military Hospital, Tunis El Manar University, Tunis, Tunisia
| | - Yasmine Khayati
- Department of Internal Medicine, Military Hospital, Tunis El Manar University, Tunis, Tunisia
| | - Samy Zriba
- Department of Hematology, Military Hospital, Tunis El Manar University, Tunis, Tunisia
| | - Wajdi Amorri
- Department of Radiology, Military Hospital, Tunis El Manar University, Tunis, Tunisia
| | - Imen Gharsallah
- Department of Internal Medicine, Military Hospital, Tunis El Manar University, Tunis, Tunisia
| | - Leila Metoui
- Department of Internal Medicine, Military Hospital, Tunis El Manar University, Tunis, Tunisia
| | - Bassem Louzir
- Department of Internal Medicine, Military Hospital, Tunis El Manar University, Tunis, Tunisia
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Meola A, Soltys S, Schmitt A, Gerszten PC, Chang SD. Stereotactic Radiosurgery for Benign Spinal Tumors. Neurosurg Clin N Am 2020; 31:231-235. [PMID: 32147014 DOI: 10.1016/j.nec.2019.12.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Benign spinal tumors are rare clinical conditions, including meningiomas, schwannomas, and neurofibromas. Although these tumors are usually treated with open surgical resection, spinal stereotactic radiosurgery may be a safe and effective alternative to surgery in selected patients.
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Affiliation(s)
- Antonio Meola
- Department of Neurosurgery, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA
| | - Scott Soltys
- Department of Radiation Oncology, Stanford University, 875 Blake Wilbur Dr, Stanford, CA 94305, USA
| | - Adam Schmitt
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, NY 10065, USA
| | - Peter C Gerszten
- Department of Neurosurgery, University of Pittsburgh Medical Center, 200 Lothrop St, Pittsburgh, PA 15213, USA
| | - Steven D Chang
- Department of Neurosurgery, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA.
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Moses ZB, Barzilai O, O'Toole JE. Benign Intradural and Paraspinal Nerve Sheath Tumors: Advanced Surgical Techniques. Neurosurg Clin N Am 2020; 31:221-229. [PMID: 32147013 DOI: 10.1016/j.nec.2019.11.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Traditional surgical techniques for benign intradural and paraspinal nerve sheath tumors often consisted of open posterior approaches. However, these were limited by the morbidity of open surgery. In addition, iatrogenic instability is often required for total resection of larger or laterally located tumors, thus necessitating the use of additional hardware for spinal fusion. Advances in surgical techniques and technologies have allowed for a plethora of minimally invasive approaches throughout the cervical, thoracic, and lumbar regions. These approaches and their particular applications for the resection of benign peripheral nerve sheath tumors are described, with special attention to modern surgical strategies.
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Affiliation(s)
- Ziev B Moses
- Department of Neurosurgery, Rush University Medical Center, Chicago, IL 60612, USA
| | - Ori Barzilai
- Department of Neurosurgery, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - John E O'Toole
- Department of Neurosurgery, Coleman Foundation Comprehensive Spine Tumor Clinic, Rush University Medical Center, 1725 West Harrison Street, Suite 855, Chicago, IL 60612, USA.
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Alexiou GA, Voulgaris S. Commentary: Surgical Resection of Cervical Meningioma: 3-Dimensional Operative Video. Oper Neurosurg (Hagerstown) 2019; 16:E165. [DOI: 10.1093/ons/opy322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 09/19/2018] [Indexed: 11/14/2022] Open
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Abd-El-Barr MM, Huang KT, Moses ZB, Iorgulescu JB, Chi JH. Recent advances in intradural spinal tumors. Neuro Oncol 2019; 20:729-742. [PMID: 29216380 DOI: 10.1093/neuonc/nox230] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Intradural spinal tumors are rare tumors of the central nervous system. Due to the eloquence of the spinal cord and its tracts, the compact architecture of the cord and nerves, and the infiltrative nature of some of these tumors, surgical resection is difficult to achieve without causing neurological deficits. Likewise, chemotherapy and radiotherapy are utilized more cautiously in the treatment of intradural spinal tumors than their cranial counterparts. Targeted therapies aimed at the genetic alterations and molecular biology tailored to these tumors would be helpful but are lacking.Here, we review the major types of intradural spinal tumors, with an emphasis on genetic alterations, molecular biology, and experimental therapies for these difficult to treat neoplasms.
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Affiliation(s)
- Muhammad M Abd-El-Barr
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Kevin T Huang
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Ziev B Moses
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - J Bryan Iorgulescu
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - John H Chi
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
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Hartman J, Granville M, Jacobson RE. Two Cases with Incidental Finding of Large Asymptomatic Intradural Lumbar Tumors. Cureus 2018; 10:e3446. [PMID: 30555761 PMCID: PMC6290981 DOI: 10.7759/cureus.3446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Benign lumbar intradural tumors are statistically uncommon and usually present with complaints of back pain with or without radicular neurological complaints. This report involves two separate patients that were found incidentally to have large intradural tumors without any neurologic complaints. In both cases the tumors were discovered when having magnetic resonance imaging (MRI) after minor auto accidents. Neither patient had any pre-existing lumbar or neurologic complaints. The report will review the different regions and types of incidental findings commonly seen on lumbar MRI scans and the need for close follow-up in patients with incidental lesions such as tumors.
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12
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Kalash R, Glaser SM, Flickinger JC, Burton S, Heron DE, Gerszten PC, Engh JA, Amankulor NM, Vargo JA. Stereotactic body radiation therapy for benign spine tumors: is dose de-escalation appropriate? J Neurosurg Spine 2018; 29:220-225. [PMID: 29799334 DOI: 10.3171/2017.12.spine17920] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Akin to the nonoperative management of benign intracranial tumors, stereotactic body radiation therapy (SBRT) has emerged as a nonoperative treatment option for noninfiltrative primary spine tumors such as meningioma and schwannoma. The majority of initial series used higher doses of 16-24 Gy in 1-3 fractions. The authors hypothesized that lower doses (such as 12-13 Gy in 1 fraction) might provide an efficacy similar to that found with the dose de-escalation commonly used for intracranial radiosurgery to treat acoustic neuroma or meningioma and with a lower risk of toxicity. METHODS The authors identified 38 patients in a prospectively maintained institutional radiosurgery database who were treated with definitive SBRT for a total of 47 benign primary spine tumors between 2004 and 2016. SBRT consisted of 9-21 Gy in 1-3 fractions using the CyberKnife (n = 11 [23%]), Synergy S (n = 21 [45%]), or TrueBeam (n = 15 [32%]) radiosurgery platform. For a comparison of SBRT doses, patients were dichotomized into 1 of 2 groups (low-dose or high-dose SBRT) using a cutoff biologically effective dose (BED10Gy) of 30 Gy. Tumor control was calculated from the date of SBRT to the last follow-up using Kaplan-Meier survival analysis, with comparisons between groups completed using a log-rank method. To account for potential indication bias, a propensity score analysis was completed based on the conditional probabilities of SBRT dose selection. Toxicity was graded using Common Terminology Criteria for Adverse Events version 4.0 with a focus on grade 3+ toxicity and the incidence of pain flare. RESULTS For the 38 patients, the most common histological findings were meningioma (15 patients), schwannoma (13 patients), and hemangioblastoma (7 patients). The median age at SBRT was 58 years (range 25-91 years). The 47 treated lesions were located in the cervical (n = 18), thoracic (n = 19), or lumbosacral (n = 10) spine. Five (11%) lesions were lost to follow-up after SBRT. The median follow-up duration for the remaining 42 lesions was 54 months (range 1.2-133 months). Six (16%) patients (with a total of 8 lesions) experienced pain flare after SBRT; no significant predictor of pain flare was identified. No grade 3+ acute- or late-onset complication was noted. The 5-year local control rate was 76% (95% CI 61%-91%). No significant difference in local control according to dose, fractionation, previous radiation, surgery, tumor histology, age, treatment platform, planning target volume, or spine level treated was found. The 5-year local control rates for low- and high-dose treatments were 73% (95% CI 53%-93%) and 83% (95% CI 61%-100%) (p = 0.52). In propensity score-adjusted multivariable analysis, no difference in local control was identified (HR 0.30, 95% CI 0.02-5.40; p = 0.41). CONCLUSIONS Long-term follow-up of patients treated with SBRT for benign spinal lesions revealed no significant difference between low-dose (BED10Gy ≤ 30) and high-dose SBRT in local control, pain-flare rate, or long-term toxicity.
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Affiliation(s)
| | | | | | | | | | - Peter C Gerszten
- 2Neurosurgery, University of Pittsburgh Medical Center Hillman Cancer Center, Pittsburgh, Pennsylvania
| | - Johnathan A Engh
- 2Neurosurgery, University of Pittsburgh Medical Center Hillman Cancer Center, Pittsburgh, Pennsylvania
| | - Nduka M Amankulor
- 2Neurosurgery, University of Pittsburgh Medical Center Hillman Cancer Center, Pittsburgh, Pennsylvania
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