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Matsuda R, Maeoka R, Morimoto T, Nakazawa T, Morisaki Y, Nakase K, Yokoyama S, Kotsugi M, Takeshima Y, Yamada S, Nakagawa I. Preoperative Blood Counts Predict Overall Survival in Patients Undergoing Surgical Removal of Brain Metastasis. World Neurosurg 2024; 186:e727-e733. [PMID: 38636630 DOI: 10.1016/j.wneu.2024.04.054] [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: 03/11/2024] [Revised: 04/09/2024] [Accepted: 04/10/2024] [Indexed: 04/20/2024]
Abstract
OBJECTIVE The prognosis for patients with cancer with brain metastasis (BM) requiring surgical removal is quite limited. Preoperative prognostic factors can provide meaningful information to surgeons, oncologists, and patients. This study evaluated the preoperative blood counts in patients with BM who were treated with surgical removal. METHODS Between January 2011 and November 2021, 221 consecutive surgeries were conducted on 198 patients with BM. Among the 198 patients, 188 patients with sufficient blood test data and follow-up were analyzed in this study. The tumors originated from the lungs (n = 102, 54.3%), colon (n = 26, 13.3%), breast (n = 13, 6.9%), kidney (n = 8, 4.3%), stomach (n = 6, 3.2%), and others (n = 33, 17.6%). The blood test data included neutrophils, lymphocytes, monocytes, eosinophils, basophils, red blood cell count, hemoglobin, and albumin. RESULTS The median follow-up and median survival times were both 11 months (range: 0-139 months). Higher neutrophil-lymphocyte ratio ≥ 3.17, platelet-lymphocyte ratio ≥112.7, systemic immune-inflammation index ≥594.4, systemic inflammation response index ≥1.25 were unfavorable predictors of prognosis for the patients treated with surgical removal for BM (P < 0.001). Furthermore, lower lymphocyte-monocyte ratio < 2.33 and prognostic nutritional index < 48.5 were unfavorable predictors. CONCLUSIONS Simple, less expensive, routinely ordered preoperative blood count assessments, such as the neutrophil-lymphocyte ratio, platelet-lymphocyte ratio, lymphocyte-monocyte ratio, systemic immune-inflammation index, systemic inflammation response index, and prognostic nutritional index, can predict the overall survival of patients treated with surgical removal for BM.
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Affiliation(s)
- Ryosuke Matsuda
- Department of Neurosurgery, Nara Medical University, Kashihara, Japan.
| | - Ryosuke Maeoka
- Department of Neurosurgery, Nara Medical University, Kashihara, Japan
| | - Takayuki Morimoto
- Department of Neurosurgery, Nara Medical University, Kashihara, Japan
| | - Tsutomu Nakazawa
- Department of Neurosurgery, Nara Medical University, Kashihara, Japan
| | - Yudai Morisaki
- Department of Neurosurgery, Nara Medical University, Kashihara, Japan
| | - Kenta Nakase
- Department of Neurosurgery, Nara Medical University, Kashihara, Japan
| | - Shohei Yokoyama
- Department of Neurosurgery, Nara Medical University, Kashihara, Japan
| | - Masashi Kotsugi
- Department of Neurosurgery, Nara Medical University, Kashihara, Japan
| | | | - Shuichi Yamada
- Department of Neurosurgery, Nara Medical University, Kashihara, Japan
| | - Ichiro Nakagawa
- Department of Neurosurgery, Nara Medical University, Kashihara, Japan
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Matsuda R, Hasegawa M, Tamamoto T, Inooka N, Morimoto T, Maeoka R, Nakazawa T, Ochi T, Miyasaka T, Hontsu S, Yamaki K, Miura S, Yamada S, Nishimura F, Nakagawa I, Park YS, Nakase H. Clinical Results and Hematologic Predictors of Linear Accelerator-Based Stereotactic Radiosurgery or Fractionated Stereotactic Radiotherapy for Brain Metastasis in Patients Aged 75 Years or Older: A Retrospective Study. World Neurosurg 2024; 183:e944-e952. [PMID: 38244685 DOI: 10.1016/j.wneu.2024.01.069] [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: 07/03/2023] [Revised: 01/11/2024] [Accepted: 01/12/2024] [Indexed: 01/22/2024]
Abstract
OBJECTIVE This study aimed to evaluate prognostic factors including pre-radiosurgical blood count in elderly patients (EPs) with brain metastasis (BM) who were treated using linear accelerator (LINAC)-based stereotactic radiosurgery (SRS) and fractionated stereotactic radiotherapy (fSRT) with a micro-multileaf collimator. METHODS Between January 2011 and November 2021, 101 consecutive EPs with BM were treated by LINAC-based SRS or fSRT using LINAC with a micro-multileaf collimator. EPs were defined as patients aged ≥75 years. RESULTS The tumors originated from the lungs (n = 90; 89.1%), colon (n = 2; 2.0%), and others (n = 9; 8.8%) in these EPs. The median pretreatment Karnofsky Performance Status was 80 (range, 40-100). The median follow-up time was 10 months (range, 0-76), as was the median survival. The 6-month, 1-year, and 2-year survival in the EP group was 58.3%, 43.2%, and 28.5%, respectively. Freedom from local failure at 6 months and 1 and 2 years was 97%, 95%, and 91.5%, respectively. Freedom from distant failure at 6 months and 1 and 2 years in EPs was 70.6%, 59.4%, and 54.2%, respectively. A high neutrophil/lymphocyte ratio >5.33 was an unfavorable predictor of prognosis for EPs with BMs treated with SRS and fSRT (P < 0.001). In the EPs, the prognostic factors associated with prolonged survival in the Cox proportional hazards model were being female and a good pretreatment Karnofsky Performance Status. CONCLUSIONS The findings of our study highlight the efficacy of LINAC-based SRS and fSRT with a micro-multileaf collimator in the treatment of EPs with BMs. Neutrophil/lymphocyte ratio can be an important factor in treatment decisions for EPs with BMs.
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Affiliation(s)
- Ryosuke Matsuda
- Department of Neurosurgery, Nara Medical University, Kashihara, Nara, Japan.
| | - Masatoshi Hasegawa
- Department of Radiation Oncology, Nara Medical University, Kashihara, Nara, Japan
| | - Tetsuro Tamamoto
- Department of Radiation Oncology, Nara Medical University, Kashihara, Nara, Japan; Department of Medical Informatics, Nara Medical University Hospital, Kashihara, Nara, Japan
| | - Nobuyoshi Inooka
- Department of Radiation Oncology, Nara Medical University, Kashihara, Nara, Japan
| | - Takayuki Morimoto
- Department of Neurosurgery, Nara Medical University, Kashihara, Nara, Japan
| | - Ryosuke Maeoka
- Department of Neurosurgery, Nara Medical University, Kashihara, Nara, Japan
| | - Tsutomu Nakazawa
- Department of Neurosurgery, Nara Medical University, Kashihara, Nara, Japan
| | - Tomoko Ochi
- Department of Respiratory Medicine, Nara Medical University, Kashihara, Nara, Japan
| | - Toshiteru Miyasaka
- Department of Respiratory Medicine, Nara Medical University, Kashihara, Nara, Japan
| | - Shigeto Hontsu
- Department of Respiratory Medicine, Nara Medical University, Kashihara, Nara, Japan
| | - Kaori Yamaki
- Department of Radiation Oncology, Nara Medical University, Kashihara, Nara, Japan
| | - Sachiko Miura
- Department of Radiation Oncology, Nara Medical University, Kashihara, Nara, Japan
| | - Shuichi Yamada
- Department of Neurosurgery, Nara Medical University, Kashihara, Nara, Japan
| | - Fumihiko Nishimura
- Department of Neurosurgery, Nara Medical University, Kashihara, Nara, Japan
| | - Ichiro Nakagawa
- Department of Neurosurgery, Nara Medical University, Kashihara, Nara, Japan
| | - Young-Soo Park
- Department of Neurosurgery, Nara Medical University, Kashihara, Nara, Japan
| | - Hiroyuki Nakase
- Department of Neurosurgery, Nara Medical University, Kashihara, Nara, Japan
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Long-Term Survival after Linac-Based Stereotactic Radiosurgery and Radiotherapy with a Micro-Multileaf Collimator for Brain Metastasis. Curr Oncol 2022; 29:6068-6076. [PMID: 36135046 PMCID: PMC9497847 DOI: 10.3390/curroncol29090477] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 08/22/2022] [Accepted: 08/22/2022] [Indexed: 11/24/2022] Open
Abstract
Background: this study aimed to evaluate the prognostic factors associated with long-term survival after linear accelerator (linac)-based stereotactic radiosurgery (SRS) and fractionated stereotactic radiotherapy (fSRT) with a micro-multileaf collimator for brain metastasis (BM). Methods: This single-center retrospective study included 226 consecutive patients with BM who were treated with linac-based SRS or fSRT with a micro-multileaf collimator between January 2011 and December 2018. Long-term survival (LTS) was defined as survival for more than 2 years after SRS/fSRT. Results: The tumors originated from the lung (n = 189, 83.6%), breast (n = 11, 4.9%), colon (n = 9, 4.0%), stomach (n = 4, 1.8%), kidney (n = 3, 1.3%), esophagus (n = 3, 1.3%), and other regions (n = 7, 3.1%). The median pretreatment Karnofsky performance scale (KPS) score was 90 (range: 40–100). The median follow-up time was 13 (range: 0–120) months. Out of the 226 patients, 72 (31.8%) were categorized in the LTS group. The median survival time was 43 months and 13 months in the LTS group and in the entire cohort, respectively. The 3-year, 4-year, and 5-year survival rate in the LTS group was 59.1%, 49.6%, and 40.7%, respectively. Multivariate regression logistic analysis showed that female sex, a pre-treatment KPS score ≥ 80, and the absence of extracranial metastasis were associated with long-term survival. Conclusions: female sex, a favorable pre-treatment KPS score, and the absence of extracranial metastasis were associated with long-term survival in the current cohort of patients with BM.
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Nicosia L, Navarria P, Pinzi V, Giraffa M, Russo I, Tini P, Giaj-Levra N, Alongi F, Minniti G. Stereotactic radiosurgery for the treatment of brainstem metastases: a multicenter retrospective study. Radiat Oncol 2022; 17:140. [PMID: 35945597 PMCID: PMC9364508 DOI: 10.1186/s13014-022-02111-5] [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] [Received: 05/17/2022] [Accepted: 07/26/2022] [Indexed: 11/10/2022] Open
Abstract
Background Brainstem metastases (BSM) are associated with a poor prognosis and their management represents a therapeutic challenge. BSM are often inoperable and, in absence of randomized trials, the optimal radiation treatment of BSM remains to be defined. We evaluated the efficacy and toxicity of linear accelerator (linac)-based stereotactic radiosurgery (SRS) and hypofractionated steretotactic radiotherapy (HSRT) in the treatment of BSM in a series of patients treated in different clinical centers. Methods We conducted a multicentric retrospective study of patients affected by 1–2 BSM from different histologies who underwent SRS/HSRT. Freedom from local progression (FLP), cancer-specific survival (CSS), overall survival (OS), and treatment-related toxicity were evaluated. In addition, predictors of treatment response and survivals were evaluated. Results Between 2008 and 2021, 105 consecutive patients with 111 BMS who received SRS or HSRT for 1–2 BSM were evaluated. Median follow-up time was 10 months (range 3–130). One-year FLP rate was 90.4%. At the univariate analysis, tumor volume ≤ 0.4 cc, and concurrent targeted therapy were associated with longer FLP, with combined treatment that remained a significant independent predictor [0.058, HR 0.139 (95% CI 0.0182–1.064]. Median OS and CSS were 11 months and 14.6 months, respectively. At multivariate analysis, concurrent targeted therapy administration was significantly associated with longer OS [HR 0.514 (95%CI 0.302–0.875); p = 0.01]. Neurological death occurred in 30.4% of patients, although this was due to local progression in only 3 (2.8%) patients. Conclusion Linac-based SRS/HSRT offers excellent local control to patients with BSM, with low treatment-related toxicity and no apparent detrimental effects on OS. When treated with ablative intent, BSM are an uncommon cause of neurological death. The present results indicates that patients with BSM should not be excluded a priori from clinical trials.
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Affiliation(s)
- Luca Nicosia
- Advanced Radiation Oncology Department, Cancer Care Center, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, Italy
| | - Piera Navarria
- Radiotherapy and Radiosurgery Department, Humanitas Clinical and Research Hospital-IRCCS, Rozzano, MI, Italy
| | - Valentina Pinzi
- Department of Neurosurgery, Fondazione IRCCS Istituto Neurologico C Besta, Via Celoria 11, 20133, Milan, Italy
| | - Martina Giraffa
- UPMC Hillman Cancer Center, San Pietro Hospital FBF, Rome, Italy
| | - Ivana Russo
- UPMC Hillman Cancer Center, Villa Maria, Mirabella Eclano, AV, Italy
| | - Paolo Tini
- Department of Medicine, Surgery and Neurosciences, University of Siena, Policlinico Le Scotte, 53100, Siena, Italy
| | - Niccolò Giaj-Levra
- Advanced Radiation Oncology Department, Cancer Care Center, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, Italy
| | - Filippo Alongi
- Advanced Radiation Oncology Department, Cancer Care Center, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, Italy.,University of Brescia, Brescia, Italy
| | - Giuseppe Minniti
- Department of Medicine, Surgery and Neurosciences, University of Siena, Policlinico Le Scotte, 53100, Siena, Italy. .,IRCCS Neuromed, 86077, Pozzilli, IS, Italy.
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Matsuda R, Hasegawa M, Tamamoto T, Ochi T, Miyasaka T, Inooka N, Hontsu S, Miura S, Takeshima Y, Tamura K, Yamada S, Nishimura F, Nakagawa I, Motoyama Y, Park YS, Nakase H. Linac-based stereotactic radiosurgery and fractionated stereotactic radiotherapy with a micro-multileaf collimator for brain metastasis in the primary motor cortex. JOURNAL OF RADIATION RESEARCH 2022; 63:63-70. [PMID: 34927204 PMCID: PMC8776695 DOI: 10.1093/jrr/rrab111] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 05/04/2021] [Indexed: 05/05/2023]
Abstract
This study aimed to assess the clinical outcomes of linear accelerators (linac)-based, stereotactic radiosurgery (SRS) and fractionated stereotactic radiotherapy (fSRT) with a micro-multileaf collimator for brain metastasis in the primary motor cortex (BMPMC). Thirty-five consecutive patients with BMPMC who were treated by linac-based SRS or fSRT between January 2012 and March 2020 were analyzed. BMPMC was defined as a tumor located in the precentral gyrus on gadolinium-enhanced magnetic resonance imaging (MRI) and T2-weghted imaging (T2WI). In total, 35 patients with 37 metastases were analyzed. The median follow-up time was 13 (range: 1-97) months. The tumor volume was 0.05-26.5 (median: 0.62) cm3. All patients were treated with SRS or fSRT using 35 Gy with 7 Gy per fraction daily. The median survival time (MST) was 16.9 months. The pretreatment KPS and RPA class significantly differed in terms of MST on the log-rank tests. Seven symptomatic patients had hemiparesis before SRS or fSRT. All symptomatic patients, except one with facial paresis and one who died within 3 months, experienced improvement at a 3 month follow-up. None of the patients presented with persistent radiation injury at the final follow-up. Two patients presented with grade 3 radiation-related central nervous system necrosis, which was assessed using the Common Terminology Criteria for Adverse Events (CTCAE) version 4.0. In BMPMC, SRS and fSRT had good tumor control and did not cause serious complications. Therefore, they are suitable treatment options with an acceptable safety profile.
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Affiliation(s)
- Ryosuke Matsuda
- Corresponding author. Department of Neurosurgery, Nara Medical University, 840 Shijo-cho, Kashihara, Nara 634-8522, Japan Tel: +81-744-22-3051 Fax: +81-744-29-0818
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Matsuda R, Morimoto T, Tamamoto T, Inooka N, Ochi T, Miyasaka T, Hontsu S, Yamaki K, Miura S, Takeshima Y, Tamura K, Yamada S, Nishimura F, Nakagawa I, Motoyama Y, Park YS, Hasegawa M, Nakase H. Salvage Surgical Resection after Linac-Based Stereotactic Radiosurgery for Newly Diagnosed Brain Metastasis. Curr Oncol 2021; 28:5255-5265. [PMID: 34940078 PMCID: PMC8699906 DOI: 10.3390/curroncol28060439] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Revised: 12/01/2021] [Accepted: 12/06/2021] [Indexed: 11/16/2022] Open
Abstract
Background: This study aimed to assess the clinical outcomes of salvage surgical resection (SSR) after stereotactic radiosurgery and fractionated stereotactic radiotherapy (SRS/fSRT) for newly diagnosed brain metastasis. Methods: Between November 2009 and May 2020, 318 consecutive patients with 1114 brain metastases were treated with SRS/fSRT for newly diagnosed brain metastasis at our hospital. During this study period, 21 of 318 patients (6.6%) and 21 of 1114 brain metastases (1.9%) went on to receive SSR after SRS/fSRT. Three patients underwent multiple surgical resections. Twenty-one consecutive patients underwent twenty-four SSRs. Results: The median time from initial SRS/fSRT to SSR was 14 months (range: 2–96 months). The median follow-up after SSR was 17 months (range: 2–78 months). The range of tumor volume at initial SRS/fSRT was 0.12–21.46 cm3 (median: 1.02 cm3). Histopathological diagnosis after SSR was recurrence in 15 cases, and radiation necrosis (RN) or cyst formation in 6 cases. The time from SRS/fSRT to SSR was shorter in the recurrence than in the RNs and cyst formation, but these differences did not reach statistical significance (p = 0.067). The median survival time from SSR and from initial SRS/fSRT was 17 and 74 months, respectively. The cases with recurrence had a shorter survival time from initial SRS/fSRT than those without recurrence (p = 0.061). Conclusions: The patients treated with SRS/fSRT for brain metastasis need long-term follow-up. SSR is a safe and effective treatment for the recurrence, RN, and cyst formation after SRS/fSRT for brain metastasis.
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Affiliation(s)
- Ryosuke Matsuda
- Department of Neurosurgery, Nara Medical University, Kashihara 634-8521, Japan; (T.M.); (Y.T.); (K.T.); (S.Y.); (F.N.); (I.N.); (Y.M.); (Y.-S.P.); (H.N.)
- Correspondence: ; Tel.: +81-744-22-3051
| | - Takayuki Morimoto
- Department of Neurosurgery, Nara Medical University, Kashihara 634-8521, Japan; (T.M.); (Y.T.); (K.T.); (S.Y.); (F.N.); (I.N.); (Y.M.); (Y.-S.P.); (H.N.)
| | - Tetsuro Tamamoto
- Department of Radiation Oncology, Nara Medical University, Kashihara 634-8521, Japan; (T.T.); (N.I.); (K.Y.); (S.M.); (M.H.)
- Department of Medical Informatics, Nara Medical University Hospital, Kashihara 634-8522, Japan
| | - Nobuyoshi Inooka
- Department of Radiation Oncology, Nara Medical University, Kashihara 634-8521, Japan; (T.T.); (N.I.); (K.Y.); (S.M.); (M.H.)
| | - Tomoko Ochi
- Department of Radiology, Nara Medical University Hospital, Kashihara 634-8522, Japan; (T.O.); (T.M.)
| | - Toshiteru Miyasaka
- Department of Radiology, Nara Medical University Hospital, Kashihara 634-8522, Japan; (T.O.); (T.M.)
| | - Shigeto Hontsu
- Department of Respiratory Medicine, Nara Medical University Hospital, Kashihara 634-8522, Japan;
| | - Kaori Yamaki
- Department of Radiation Oncology, Nara Medical University, Kashihara 634-8521, Japan; (T.T.); (N.I.); (K.Y.); (S.M.); (M.H.)
| | - Sachiko Miura
- Department of Radiation Oncology, Nara Medical University, Kashihara 634-8521, Japan; (T.T.); (N.I.); (K.Y.); (S.M.); (M.H.)
| | - Yasuhiro Takeshima
- Department of Neurosurgery, Nara Medical University, Kashihara 634-8521, Japan; (T.M.); (Y.T.); (K.T.); (S.Y.); (F.N.); (I.N.); (Y.M.); (Y.-S.P.); (H.N.)
| | - Kentaro Tamura
- Department of Neurosurgery, Nara Medical University, Kashihara 634-8521, Japan; (T.M.); (Y.T.); (K.T.); (S.Y.); (F.N.); (I.N.); (Y.M.); (Y.-S.P.); (H.N.)
| | - Shuichi Yamada
- Department of Neurosurgery, Nara Medical University, Kashihara 634-8521, Japan; (T.M.); (Y.T.); (K.T.); (S.Y.); (F.N.); (I.N.); (Y.M.); (Y.-S.P.); (H.N.)
| | - Fumihiko Nishimura
- Department of Neurosurgery, Nara Medical University, Kashihara 634-8521, Japan; (T.M.); (Y.T.); (K.T.); (S.Y.); (F.N.); (I.N.); (Y.M.); (Y.-S.P.); (H.N.)
| | - Ichiro Nakagawa
- Department of Neurosurgery, Nara Medical University, Kashihara 634-8521, Japan; (T.M.); (Y.T.); (K.T.); (S.Y.); (F.N.); (I.N.); (Y.M.); (Y.-S.P.); (H.N.)
| | - Yasushi Motoyama
- Department of Neurosurgery, Nara Medical University, Kashihara 634-8521, Japan; (T.M.); (Y.T.); (K.T.); (S.Y.); (F.N.); (I.N.); (Y.M.); (Y.-S.P.); (H.N.)
| | - Young-Soo Park
- Department of Neurosurgery, Nara Medical University, Kashihara 634-8521, Japan; (T.M.); (Y.T.); (K.T.); (S.Y.); (F.N.); (I.N.); (Y.M.); (Y.-S.P.); (H.N.)
| | - Masatoshi Hasegawa
- Department of Radiation Oncology, Nara Medical University, Kashihara 634-8521, Japan; (T.T.); (N.I.); (K.Y.); (S.M.); (M.H.)
| | - Hiroyuki Nakase
- Department of Neurosurgery, Nara Medical University, Kashihara 634-8521, Japan; (T.M.); (Y.T.); (K.T.); (S.Y.); (F.N.); (I.N.); (Y.M.); (Y.-S.P.); (H.N.)
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7
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Chen WC, Baal UH, Baal JD, Pai JS, Boreta L, Braunstein SE, Raleigh DR. Efficacy and Safety of Stereotactic Radiosurgery for Brainstem Metastases: A Systematic Review and Meta-analysis. JAMA Oncol 2021; 7:1033-1040. [PMID: 33983393 DOI: 10.1001/jamaoncol.2021.1262] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Importance Owing to the proximity to critical neurologic structures, treatment options for brainstem metastases (BSM) are limited, and BSM growth can cause acute morbidity or death. Stereotactic radiosurgery (SRS) is the only local therapy for BSM, but efficacy and safety of this approach are incompletely understood because patients with BSM are excluded from most clinical trials. Objective To perform a systematic review and comparative meta-analysis of SRS studies for BSM in the context of prospective trials of SRS or molecular therapy for nonbrainstem brain metastases (BM). Data Sources A comprehensive search of Pubmed/MEDLINE and Embase was performed on December 6, 2019. Study Selection English-language studies of SRS for BSM with at least 10 patients and reporting 1 or more outcomes of interest were included. Duplicate studies or studies with overlapping data sets were excluded. Studies were independently evaluated by 2 reviewers, and discrepancies were resolved by consensus. A total of 32 retrospective studies published between 1999 and 2019 were included in the analysis. Data Extraction and Synthesis Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guidelines were followed to identify studies. Study quality was assessed using Methodological Index for Non-Randomized Studies criteria. Fixed and random-effects meta-analyses and meta-regressions were performed for the outcomes of interest. Main Outcomes and Measures Primary study outcomes included 1-year and 2-year local control and overall survival, objective response rate, symptom response rate, neurological death rate, and rate of grade 3 to 5 toxic effects as described in Common Terminology Criteria for Adverse Events, version 4.0. Results The 32 retrospective studies included in the analysis comprised 1446 patients with 1590 BSM that were treated with SRS (median [range] dose, 16 [11-39] Gy; median [range] fractions, 1 [1-13]). Local control at 1 year was 86% (95% CI, 83%-88%; I2 = 38%) in 1410 patients across 31 studies, objective response rate was 59% (95% CI, 47%-71%; I2 = 88%) in 642 patients across 17 studies, and symptom improvement was 55% (95% CI, 47%-63%; I2 = 41%) in 323 patients across 13 studies. Deaths from BSM progression after SRS were rare (19 of 703 [2.7%] deaths across 19 studies), and the neurologic death rate in patients with BSM (24%; 95% CI, 19%-31%; I2 = 62%) was equivalent to the neurologic death rate in patients with BM who were treated on prospective trials. The rate of treatment-related grade 3 to 5 toxic effects was 2.4% (95% CI, 1.5%-3.7%; I2 = 33%) in 1421 patients across 31 studies. These results compared favorably to trials of targeted or immunotherapy for BM, which had a wide objective response rate range from 17% to 56%. Conclusions and Relevance Results of this systematic review and meta-analysis show that SRS for BSM was associated with effectiveness and safety and was comparable to SRS for nonbrainstem BM, suggesting that patients with BSM should be eligible for clinical trials of SRS. In this analysis, patients treated with SRS for BSM rarely died from BSM progression and often experienced symptomatic improvement. Given the apparent safety and efficacy of SRS for BSM in the context of acute morbidity or death from BSM growth, consideration of SRS at the time of enrollment on emerging trials of targeted therapy for BM should be considered.
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Affiliation(s)
- William C Chen
- Department of Radiation Oncology, University of California, San Francisco
| | - Ulysis H Baal
- Department of Radiology and Biomedical Imaging, University of California, San Francisco
| | - Joe D Baal
- Department of Radiology and Biomedical Imaging, University of California, San Francisco
| | - Jon S Pai
- Department of Internal Medicine, University of Southern California, Los Angeles
| | - Lauren Boreta
- Department of Radiation Oncology, University of California, San Francisco
| | - Steve E Braunstein
- Department of Radiation Oncology, University of California, San Francisco
| | - David R Raleigh
- Department of Radiation Oncology, University of California, San Francisco.,Department of Neurological Surgery, University of California, San Francisco
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