scholarly journals Multimodal integrated approaches in low grade glioma surgery

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tamara Ius ◽  
Edoardo Mazzucchi ◽  
Barbara Tomasino ◽  
Giada Pauletto ◽  
Giovanni Sabatino ◽  
...  
Keyword(s):  
Neuropsychological Testing ◽  
Extent Of Resection ◽  
Awake Surgery ◽  
Low Grade ◽  
Glioma Surgery ◽  
Neuronavigation System ◽  
Integrated Approaches ◽  
The Impact ◽  
Over Time

AbstractSurgical management of Diffuse Low-Grade Gliomas (DLGGs) has radically changed in the last 20 years. Awake surgery (AS) in combination with Direct Electrical Stimulation (DES) and real-time neuropsychological testing (RTNT) permits continuous intraoperative feedback, thus allowing to increase the extent of resection (EOR). The aim of this study was to evaluate the impact of the technological advancements and integration of multidisciplinary techniques on EOR. Two hundred and eighty-eight patients affected by DLGG were enrolled. Cases were stratified according to the surgical protocol that changed over time: 1. DES; 2. DES plus functional MRI/DTI images fused on a NeuroNavigation system; 3. Protocol 2 plus RTNT. Patients belonging to Protocol 1 had a median EOR of 83% (28–100), while those belonging to Protocol 2 and 3 had a median EOR of 88% (34–100) and 98% (50–100) respectively (p = 0.0001). New transient deficits with Protocol 1, 2 and 3 were noted in 38.96%, 34.31% and 31,08% of cases, and permanent deficits in 6.49%, 3.65% and 2.7% respectively. The average follow-up period was 6.8 years. OS was influenced by molecular class (p = 0.028), EOR (p = 0.018) and preoperative tumor growing pattern (p = 0.004). Multimodal surgical approach can provide a safer and wider removal of DLGG with potential subsequent benefits on OS. Further studies are necessary to corroborate our findings.

scholarly journals Brain mapping: a novel intraoperative neuropsychological approach

2016 ◽  
Vol 125 (4) ◽  
pp. 877-887 ◽  
Author(s):  
Miran Skrap ◽  
Dario Marin ◽  
Tamara Ius ◽  
Franco Fabbro ◽  
Barbara Tomasino
Keyword(s):  
Real Time ◽  
Cognitive Functions ◽  
Cognitive Abilities ◽  
Brain Area ◽  
Extent Of Resection ◽  
Awake Surgery ◽  
Low Grade ◽  
Predictive Tool ◽  
Extensive Resection ◽  
The Impact

OBJECTIVE Awake surgery and mapping are performed in patients with low-grade tumors infiltrating functional brain areas for which the greater the resection, the longer the patient survival. However, the extent of resection is subject to preservation of cognitive functions, and in the absence of proper feedback during mapping, the surgeon may be less prone to perform an extensive resection. The object of this study was to perform real-time continuous assessment of cognitive function during the resection of tumor tissue that could infiltrate eloquent tissue. METHODS The authors evaluated the use of new, complex real-time neuropsychological testing (RTNT) in a series of 92 patients. They reported normal scoring and decrements in patient performance as well as reversible intraoperative neuropsychological dysfunctions in tasks (for example, naming) associated with different cognitive abilities. RESULTS RTNT allowed one to obtain a more defined neuropsychological picture of the impact of surgery. The influence of this monitoring on surgical strategy was expressed as the mean extent of resection: 95% (range 73%–100%). At 1 week postsurgery, the neuropsychological scores were very similar to those detected with RTNT, revealing the validity of the RTNT technique as a predictive tool. At the follow-up, the majority of neuropsychological scores were still > 70%, indicating a decrease of < 30%. CONCLUSIONS RTNT enables continuous enriched intraoperative feedback, allowing the surgeon to increase the extent of resection. In sharp contrast to classic mapping techniques, RTNT allows testing of several cognitive functions for one brain area under surgery.

scholarly journals Neuropsychological assessments before and after awake surgery for incidental low-grade gliomas

2020 ◽  
pp. 1-10
Author(s):  
Sam Ng ◽  
Guillaume Herbet ◽  
Anne-Laure Lemaitre ◽  
Jérôme Cochereau ◽  
Sylvie Moritz-Gasser ◽  
...  
Keyword(s):  
Cognitive Domain ◽  
Awake Surgery ◽  
Consecutive Series ◽  
Low Grade ◽  
Asymptomatic Patients ◽  
Z Scores ◽  
Neuropsychological Assessments ◽  
Neuropsychological Outcomes ◽  
The Impact

OBJECTIVEEarly surgery in presumed asymptomatic patients with incidental low-grade glioma (ILGG) has been suggested to improve maximal resection rates and overall survival. However, no study has reported on the impact of such preventive treatment on cognitive functioning. The aim of this study was to investigate neuropsychological outcomes in patients with ILGG who underwent preventive surgery.METHODSThis was a retrospective analysis of a consecutive series of patients with ILGG who underwent awake surgery and who had presurgical and 3-month postsurgical neuropsychological assessments. Data were normalized into z-scores and regrouped by cognitive domains. Clinicoradiological data, histomolecular profile, and differences in z-scores (Δz-scores) were analyzed.RESULTSForty-seven patients were included (mean age 39.2 ± 11.3 years). Twenty-eight patients (59.6%) underwent supratotal or total resections. All patients were still alive after a mean follow-up of 33.0 ± 30.8 months. Forty-one patients (87.2%) had stable (n = 34, 72.3%) or improved (Δz-score > 1; n = 7, 14.9%) neurocognitive outcomes after surgery. Six patients (12.8%) presented a slight impairment (Δz-score < −1) in at least one cognitive domain. The mean presurgical and postsurgical z-scores were comparable except in the psychomotor speed and attention domain. A significant correlation between presurgical executive functioning and tumor volume was reported, whereas the extent of resection and histomolecular profile did not impact neuropsychological outcomes.CONCLUSIONSEarly surgical treatment in presumed asymptomatic patients with ILGG was associated with stable or improved neuropsychological outcomes in 87.2% of patients at 3 months, with only mild cognitive decline observed in 6 patients. In return, supratotal or total resections were achieved in most patients, and all patients were still alive at the end of the follow-up.

Return to Work Following Surgery for Incidental Diffuse Low-Grade Glioma: A Prospective Series With 74 Patients

Neurosurgery ◽  
2019 ◽  
Vol 87 (4) ◽  
pp. 720-729 ◽  
Author(s):  
Sam Ng ◽  
Guillaume Herbet ◽  
Sylvie Moritz-Gasser ◽  
Hugues Duffau
Keyword(s):  
Return To Work ◽  
Extent Of Resection ◽  
Low Grade Glioma ◽  
High Rate ◽  
Awake Surgery ◽  
Prophylactic Surgery ◽  
Low Grade ◽  
Oncological Treatment ◽  
Asymptomatic Patients

Abstract BACKGROUND Therapeutic strategy concerning incidental low-grade glioma (ILGG) is still debated. Early “prophylactic” surgery has been proposed in asymptomatic patients with favorable neurological and oncological outcomes. OBJECTIVE To assess postoperative ability to resume employment following awake surgery in asymptomatic ILGG patients. To assess extent of resection (EOR), timeline for adjuvant oncological treatment, and survival. METHODS A total of 74 patients with ILGG who underwent awake surgery with intraoperative mapping were prospectively included, with a minimum follow-up of 12 mo. All clinicoradiological data were collected, and statistical correlations with return to work (RTW) were performed. RESULTS A total of 66 patients (97.1%) among 68 patients with preoperative professional activities resumed their employment including 62 (91.2%) within 12 mo. Mean time before RTW was 6.8 mo (median: 6 mo, range: 1-36). Two patients experienced seizure-related legal issues impacting their RTW. Clinicoradiological features did not correlate with RTW apart from postoperative seizures (P = .02). Mean EOR was 95.7%. A total of 43 patients (58.1%) underwent supratotal/total resections. All patients recovered from transient deficits at 3 mo. No patients received consecutive adjuvant treatment. A total of 24 patients (32.4%) were reoperated, 24 patients received chemotherapy, and 7 patients (9.5%) received radiotherapy, on average 73.1 mo after surgery. Mean follow-up was 67 mo (range 12-240). Four patients (5.4%) died during the follow-up. CONCLUSION We observed a high rate of RTW (97.1%, including 91.2% within 12 mo) after awake surgery in ILGG patients. Delayed resumption of work was due to employer not clearing them for RTW, personal choice, and, in rare occasions, related to seizures.

ITVT-08. Combined use of awake surgery and intraoperative MRI augments extent of resection in eloquent gliomas without neurological impairment

2021 ◽  
Vol 23 (Supplement_6) ◽  
pp. vi229-vi230
Author(s):  
Christine Jungk ◽  
Philip Dao Trong ◽  
Christoph Eisner ◽  
Stefan Haehnel ◽  
Andreas Unterberg
Keyword(s):  
Functional Limitations ◽  
Neurological Impairment ◽  
Extent Of Resection ◽  
Intraoperative Mri ◽  
Neurological Deficits ◽  
Awake Surgery ◽  
Glioma Surgery ◽  
Resection Control ◽  
Valuable Adjunct ◽  
The Impact

Abstract Maximizing the extent of resection (EOR) while preserving functional integrity is a mainstay of glioma surgery. Intraoperative MRI (iMRI) helps to augment the EOR. However, in eloquently located gliomas the significance of iMRI is controversial since the EOR is limited by functional rather than image-based boundaries. Thus, we sought to determine the impact of iMRI in our institutional series of awake glioma resections within or adjacent to eloquent (language, motor, sensory) areas since the implementation of a 1.5 Tesla iMRI in 2009. Tumor- and procedure-related data and functional outcome were assessed through medical charts review. The EOR was determined volumetrically on pre-, intra- and postoperative T1 contrast-enhanced (CE) and FLAIR MR images. 131 of 166 awake surgeries (79%) were performed under iMRI-guidance with concurrent language (n=72) and/or motor (n=50) mapping. iMRI was done when functional boundaries were reached (62%), for resection control (28%) or for other reasons (10%). Additional resection after iMRI (AR) was performed in 63 cases (73%); otherwise resection was terminated because the targeted EOR or functional boundaries were reached. New or deteriorated neurological deficits occurred in 20 patients prior and 15 patients post iMRI; however, all but 3 resolved within 6 months. Median EOR significantly increased after AR from 92.6% to 98.4% (∆5.8%; p&lt;0.0001) in CE tumors and from 64.5% to 85.8% (∆21.3%; p&lt;0.0001) in non-enhancing tumors. Remarkably, the reason to perform iMRI (resection control or functional limitations), did not affect the frequency of AR, deficits acquired post iMRI or the increase in EOR after AR. In conclusion, iMRI is a valuable adjunct to maximize the EOR in awake glioma resections without increasing the risk for functional impairment, particularly in non-enhancing tumors. Importantly, iMRI contributes to a maximized EOR even in cases where the resection had to be stopped because functional boundaries were reached.

scholarly journals RONC-12. TREATMENT AGE AND NEUROCOGNITIVE OUTCOMES FOLLOWING PROTON BEAM RADIOTHERAPY FOR PEDIATRIC LOW GRADE GLIOMA

2020 ◽  
Vol 22 (Supplement_3) ◽  
pp. iii457-iii458
Author(s):  
Andrew Heitzer ◽  
Lisa Kahalley ◽  
David Grosshans ◽  
M Fatih Okcu ◽  
Kimberly Raghubar ◽  
...  
Keyword(s):  
Cognitive Functioning ◽  
Low Grade Glioma ◽  
Gross Total Resection ◽  
Low Grade ◽  
Total Resection ◽  
Prospective Longitudinal Study ◽  
Prospective Longitudinal ◽  
The Impact ◽  
Over Time

Abstract INTRODUCTION Younger age at radiotherapy increases cognitive risk for patients with pediatric low grade glioma (LGG). We examined the impact of age at treatment on cognitive trajectories in LGG patients treated with proton radiotherapy (PRT) compared to patients treated without radiotherapy (surgery only; SO). METHODS We examined cognitive scores of 48 LGG patients on a prospective, longitudinal study. General linear mixed models evaluated change in cognitive scores over time. RESULTS The sample included 16 patients treated with PRT and 32 with SO (median follow-up=3.1 years, range 0.9–6.1). Median age of PRT patients was 8.2 years at diagnosis (range 1.0–14.4) and 9.4 years at PRT (range 4.2–16.7). 13 PRT patients also received surgery: 53.8% biopsy, 30.8% subtotal resection, 15.4% gross total resection. Tumor sites included: 31.2% hypothalamic/suprasellar, 25.0% optic pathway, 18.8% temporal, 25.0% other. Median age of SO patients was 8.2 years at diagnosis (range 2.9–18.6). Surgical outcomes were: 75.0% gross total resection, 21.9% biopsy/other. There were no group differences in diagnosis age, tumor volume, or shunt history (all p&gt;0.05). Both PRT and SO groups displayed stable cognitive functioning over time (all p&gt;0.1). Slopes (i.e., change in scores over time) did not differ between groups (all p&gt;0.1). Age at treatment was not associated with slope or performance at last follow-up in either group (all p&gt;0.05). CONCLUSIONS We observed stable cognitive functioning, independent of age at treatment, following PRT for LGG. Outcomes were similar to patients receiving surgery only. Further examination in a larger sample is warranted.

scholarly journals THU0389 OBESITY IS A STRONG PREDICTOR OF WORSE CLINICAL OUTCOMES AND TREATMENT RESPONSES TO BIOLOGICS IN PATIENTS WITH ANKYLOSING SPONDYLITIS

2020 ◽  
Vol 79 (Suppl 1) ◽  
pp. 429.2-429
Author(s):  
L. Hu ◽  
X. Ji ◽  
F. Huang
Keyword(s):  
Ankylosing Spondylitis ◽  
Disease Activity ◽  
Clinical Outcomes ◽  
Normal Weight ◽  
Low Grade ◽  
Hla B27 ◽  
Treatment Responses ◽  
The Impact ◽  
Overweight Or Obesity

Background:Obesity population are rising rapidly and have become a major health issue. Studies have shown that obesity is a low-grade inflammatory status characterized by increase in proinflammatory cytokines.Objectives:To examine the impact of overweight or obesity on disease activity and treatment responses to biologics in patients with ankylosing spondylitis (AS) in a real-world setting.Methods:Body mass index (BMI) is available in 1013 patients from the Chinese Ankylosing Spondylitis Imaging Cohort (CASPIC). Differences in clinical outcomes (such as BASDAI, ASDAS, BASFI, and ASAS HI) and treatment responses to biologics (ΔBASDAI and ΔASDAS) over 3, 6, 9, and 12 months are assessed between BMI categories (normal weight BMI <24 kg/m2; overweight BMI=24-28 kg/m2; obesity BMI ≥28 kg/m2) using Kruskal-Wallis test. The association between BMI and clinical characteristics and treatment responses to biologics was determined, and multivariate median regression analyses were conducted to adjust for confounders (such as age, gender, smoke, and HLA-B27).Results:Among 1013 patients with AS, overweight accounts for 33%, while obesity for 12.4%. There were significant differences between patients who were obese or overweight and those with a normal weight regarding clinical outcomes (BASDAI: 2.90/2.56 vs 2.21; ASDAS-CRP: 2.20/1.99 vs 1.81; BASFI: 2.13/1.69 vs 1.38; ASAS HI: 6.87/5.29 vs 5.12 and BASMI: 2.35/1.76 vs 1.62; all P<0.05). After adjusting for age, gender, smoke, and HLA-B27, obesity remained associated with higher disease activity (BASDAI: β=0.55, P=0.005; ASDAS-CRP: β=0.40, P<0.001), poorer functional capacity (BASFI: β=0.58, P=0.001), worse health index (ASAS HI: β=1.92, P<0.001) and metrology index (BASMI: β=0.71, P=0.013). For TNFi users, BMI was found to be negatively correlated with changes in disease activity (ΔBASDAI and ΔASDAS) in the multivariate regression model (all P<0.05), and overweight and obese patients showed an unsatisfactory reduction in disease activity during 3-month, 6-month, 9-month, and 12-month follow-up period, compared to normal weight patients (all P<0.05).Conclusion:Overweight or obesity impacts greatly on clinical outcomes and treatment responses to biologics in patients with ankylosing spondylitis, which argues strongly for obesity management to become central to prevention and treatment strategies in patients with AS.References:[1]Maachi M, Pieroni L, Bruckert E, et al. Systemic low-grade inflammation is related to both circulating and adipose tissue TNFalpha, leptin and IL-6 levels in obese women. Int J Obes Relat Metab Disord 2004;28:993–7.Figure 1.Changes of disease activity for TNFi users during 3-, 6-, 9- and 12-month follow-up according to BMI categories. a: vs. normal weight, P<0.05 in 3 months; b: vs. normal weight, P<0.05 in 6 months; c: vs. normal weight, P<0.05 in 9 months; d: vs. normal weight, P<0.05 in 12 months.Acknowledgments:We appreciate the contribution of the present or former members of the CASPIC study group.Disclosure of Interests:None declared

T3 Are Burns a Chronic Condition: Examining Physical and Mental Functioning up to 20 Years After Injury

2021 ◽  
Vol 42 (Supplement_1) ◽  
pp. S2-S3
Author(s):  
Callie Abouzeid ◽  
Audrey E Wolfe ◽  
Gretchen J Carrougher ◽  
Nicole S Gibran ◽  
Radha K Holavanahalli ◽  
...  
Keyword(s):  
Mental Health ◽  
Hospital Stay ◽  
National Database ◽  
Time Points ◽  
Patient Reported ◽  
Burn Survivors ◽  
Population Demographic ◽  
The Impact ◽  
Over Time

Abstract Introduction Burn survivors often face many long-term physical and psychological symptoms associated with their injury. To date, however, few studies have examined the impact of burn injuries on quality of life beyond 2 years post-injury. The purpose of this study is to examine the physical and mental well-being of burn survivors up to 20 years after injury. Methods Data from the Burn Model System National Database (1997–2020) were analyzed. Patient-reported outcome measures were collected at discharge with a recall of preinjury status, and then at 5, 10, 15, and 20 years after injury. Outcomes examined were the Physical Component Summary (PCS) and Mental Component Summary (MCS) of the Short Form-12. Trajectories were developed using linear mixed methods model with repeated measures of PCS and MCS scores over time and controlling for demographic and clinical variables. The model fitted score trajectory was generated with 95% confidence intervals to demonstrate score changes over time and associations with covariates. Results The study population included 420 adult burn survivors with a mean age of 42.4 years. The population was mainly male (66%) and white (76.4%) with a mean burn size of 21.5% and length of hospital stay of 31.3 days. Higher PCS scores were associated with follow-up time points closer to injury, shorter hospital stay, and younger age. Similarly, higher MCS scores were associated with earlier follow-up time points, shorter hospital stay, female gender, and non-perineal burns. MCS trajectories are demonstrated in the Figure. Conclusions Burn survivors’ physical and mental health worsened over time. Such a trend is different from previous reported results for mental health in the general population. Demographic and clinical predictors of recovery over time are identified.

Presurgical fMRI Affecting the Extent of Resection and Outcome of the Supratentorial Gliomas; a Single-center Experience From a Developing Country

2021 ◽  
Author(s):  
Abolghasem Mortazavi ◽  
Mohammad Ali Suraki Azad ◽  
Abbas Amirjamshidi ◽  
Mohammad Shirani ◽  
Seyed Ebrahim Ketabchi ◽  
...  
Keyword(s):  
Tumor Grade ◽  
Extent Of Resection ◽  
Positive Outcome ◽  
Short Term ◽  
Glioma Surgery ◽  
Term Outcome ◽  
Eloquent Areas ◽  
Single Center Experience ◽  
Supratentorial Gliomas

Abstract BackgroundFunctional magnetic resonance imaging (fMRI) is one of the available non-invasive imaging to map the different brain areas, which has been used during the current years. In this study, we aimed to evaluate the effect of fMRI on decision-making, the extent of resection, and the outcome of the patients with supratentorial gliomas.MethodsThis prospective study conducted from 2014 through 2017 to investigate how presurgical fMRI can help the neurosurgeon during glioma surgery. Baseline demographic and clinical data were collected, and standard fMRI protocol was used for each patient.Results Forty-one patients with supratentorial gliomas met inclusion criteria, including 29 males and 12 females ranging in age from 21 to 72. Our results showed a significant association between eloquent areas tumor and the EOR. Eight out of 41 (19.5%) experienced higher EOR than what the neurosurgeon expected after adjusting the fMRI findings with the intraoperative situation. Among these patients, postoperative KPS and motor indices reflected dropped levels accompanied by an instant language index level in the short-term period, whereas all indices improved after long-term follow-up. There was a significant association between increasing EOR and all indices in the 1-year follow-up.ConclusionsIn conclusion, we postulate that preoperative fMRI should be considered preoperatively, especially in the eloquent areas gliomas disregarding tumor grade. Moreover, it can lead to a positive outcome in supratentorial gliomas via giving useful data about the relation of the tumor and vital centers of the brain, although it may result in an unfavorable short-term outcome.

BRMP-01. Awake cranial surgery with intraoperative language mapping for brain tumors. A single-center experience

2021 ◽  
Vol 23 (Supplement_6) ◽  
pp. vi223-vi223
Author(s):  
Andrés Cervio ◽  
Sebastían Giovannini ◽  
Sonia Hasdeu ◽  
Lucía Pertierra ◽  
Blanca Diez
Keyword(s):  
Brain Tumors ◽  
Functional Mri ◽  
Tumor Resection ◽  
Awake Surgery ◽  
Anesthetic Technique ◽  
Low Grade ◽  
Safe Procedure ◽  
Language Mapping ◽  
Cranial Surgery

Abstract BACKGROUND Maximal safe resection of brain tumors affecting language areas has been a matter of increasing interest worldwide in the last decades. Functional MRI, tractography, and awake cranial surgery are standard procedures in our department since 2006. The aim of this study was to describe our experience in a series of 58 patients who underwent awake cranial surgery with intraoperative language mapping. METHODS Retrospective study of 58 adult patients who underwent awake surgery for brain tumors between January 2006 and January 2021. Preoperative neuropsychological assessment served as inclusion criteria. Language was evaluated according to the BDAE (Boston diagnostic aphasia examination) and WAB (Western aphasia battery) and strength according to the MRC (Medical Research Council) motor scale in the preoperative, immediate postoperative, and 3-months follow up. Functional MRI and tractography depicting white-matter tracts, neuronavigation, cortical and subcortical stimulation were performed in all cases. Conscious sedation was the anesthetic technique (propofol, fentanyl, and NSAIDs). Minimum follow-up was 6 months. FINDINGS The average age was 35 years (16–74). The anatomopathological findings were: low-grade glioma in 75,8% (n = 44), high-grade glioma in 15,6% (n = 9) and others in 8,6% (n = 5). No complications were registered during postoperative course. At the immediate postoperative evaluation 65% of patients presented with speech disturbances but at the 3-months follow up speech recovery was observed in all cases. Only 1 patient remained with moderate aphasia. mRS score at 3- months follow up was ≤ 1 in 96% of patients. Two patients had a persistent moderate hemiparesis. CONCLUSION Tumor resection in awake patients showed to be a safe procedure, and well tolerated by the patients. Preoperative planning of anatomical and functional aspects and intraoperative neurophysiological assessment are the cornerstones for pursuing maximal safe resection.

scholarly journals The Role of Extent of Resection in IDH1 Wild-Type or Mutant Low-Grade Gliomas

Neurosurgery ◽  
2017 ◽  
Vol 82 (6) ◽  
pp. 808-814 ◽  
Author(s):  
Toral Patel ◽  
Evan D Bander ◽  
Rachael A Venn ◽  
Tiffany Powell ◽  
Gustav Young-Min Cederquist ◽  
...  
Keyword(s):  
Cox Regression ◽  
Extent Of Resection ◽  
World Health ◽  
Low Grade ◽  
Wild Type ◽  
Who Grade ◽  
Cox Regression Analysis ◽  
Low Grade Gliomas ◽  
Grade Ii ◽  
The Impact

Abstract BACKGROUND Maximizing extent of resection (EOR) improves outcomes in adults with World Health Organization (WHO) grade II low-grade gliomas (LGG). However, recent studies demonstrate that LGGs bearing a mutation in the isocitrate dehydrogenase 1 (IDH1) gene are a distinct molecular and clinical entity. It remains unclear whether maximizing EOR confers an equivalent clinical benefit in IDH mutated (mtIDH) and IDH wild-type (wtIDH) LGGs. OBJECTIVE To assess the impact of EOR on malignant progression-free survival (MPFS) and overall survival (OS) in mtIDH and wtIDH LGGs. METHODS We performed a retrospective review of 74 patients with WHO grade II gliomas and known IDH mutational status undergoing resection at a single institution. EOR was assessed with quantitative 3-dimensional volumetric analysis. The effect of predictor variables on MPFS and OS was analyzed with Cox regression models and the Kaplan–Meier method. RESULTS Fifty-two (70%) mtIDH patients and 22 (30%) wtIDH patients were included. Median preoperative tumor volume was 37.4 cm3; median EOR of 57.6% was achieved. Univariate Cox regression analysis confirmed EOR as a prognostic factor for the entire cohort. However, stratifying by IDH status demonstrates that greater EOR independently prolonged MPFS and OS for wtIDH patients (hazard ratio [HR] = 0.002 [95% confidence interval {CI} 0.000-0.074] and HR = 0.001 [95% CI 0.00-0.108], respectively), but not for mtIDH patients (HR = 0.84 [95% CI 0.17-4.13] and HR = 2.99 [95% CI 0.15-61.66], respectively). CONCLUSION Increasing EOR confers oncologic and survival benefits in IDH1 wtLGGs, but the impact on IDH1 mtLGGs requires further study.

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