Publications by authors named "Ishaan Tewarie"

Background: Focused ultrasound (FUS) shows promise for enhancing drug delivery to the brain by temporarily opening the blood-brain barrier (BBB), and it is increasingly used in the clinical setting to treat brain tumours. It remains however unclear whether FUS is being introduced in an ethically and methodologically sound manner. The IDEAL-D framework for the introduction of surgical innovations and the SYRCLE and ROBINS-I tools for assessing the risk of bias in animal studies and non-randomized trials, respectively, provide a comprehensive evaluation for this.

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Background: Meningiomas are common intracranial tumors. Machine learning (ML) algorithms are emerging to improve accuracy in 4 primary domains: classification, grading, outcome prediction, and segmentation. Such algorithms include both traditional approaches that rely on hand-crafted features and deep learning (DL) techniques that utilize automatic feature extraction.

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Objective: The incidence of leptomeningeal disease (LMD) has increased as treatments for brain metastases (BMs) have improved and patients with metastatic disease are living longer. Sample sizes of individual studies investigating LMD after surgery for BMs and its risk factors have been limited, ranging from 200 to 400 patients at risk for LMD, which only allows the use of conventional biostatistics. Here, the authors used machine learning techniques to enhance LMD prediction in a cohort of surgically treated BMs.

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  • * Out of 170 patients, 43.5% experienced a second local recurrence at a median of 7 months post-surgery.
  • * Key risk factors for a poorer outcome were found to be subtotal resection of the initial BM and the location of the tumor in the infratentorial region.
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  • This meta-analysis investigated the impact of smoking on overall survival (OS) and progression-free survival (PFS) in patients with lung cancer brain metastases (BM).
  • Analysis included 15 studies with 2,915 patients, indicating that smokers had a 34% higher risk of worse survival outcomes compared to non-smokers.
  • The findings suggest a strong association between smoking and decreased survival among lung carcinoma BM patients, highlighting the need for more standardized reporting of smoking status in future research.
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Neurosurgical task force is limited and unevenly distributed. Telemedicine has become increasingly popular, and could help neurosurgical centers meet patient right to care. This scoping review aims to evaluate the impact and feasibility of telemedicine on the right to neurosurgical care, using the AAAQ toolbox.

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There is a fundamental need to establish the most ethical and effective way of tracking disease in the postpandemic era. The ubiquity of mobile phones is generating large amounts of passive data (collected without active user participation) that can be used as a tool for tracking disease. Although discussions of pragmatism or economic issues tend to guide public health decisions, ethical issues are the foremost public concern.

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Background: Gliomas represent most common primary brain tumors. Glioblastoma (GBM) is the most common subtype and carries a poor prognosis. There is growing interest in the anti-glioma properties of statins.

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  • - Leptomeningeal disease (LMD) is a severe complication of brain metastases, leading to a poor prognosis with a median survival of only 2-4 months, and this study aimed to identify risk factors associated with LMD after surgery for brain metastases.
  • - The meta-analysis included 13 studies with over 2,100 patients, finding that 16.1% developed LMD, with significant risk factors such as tumor size, location, surgical methods, and specifically, breast cancer as the primary tumor type and multiple brain metastases being key contributors.
  • - The research emphasized the need to consider various risk factors, as breast cancer origins and having multiple brain metastases notably increase the likelihood of developing
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Background: In patients with locally recurrent brain metastases (LRBMs), the role of (repeat) craniotomy is controversial. This study aimed to analyze long-term oncological outcomes in this heterogeneous population.

Methods: Craniotomies for LRBM were identified from a tertiary neuro-oncological institution.

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  • Immune checkpoint inhibitors (ICI) are beneficial for cancer patients, including those with brain metastases (BMs), but the interaction with steroids is unclear.
  • A systematic literature review analyzed data from 15 studies involving 1102 BM patients, with 32.1% using steroids, revealing worse overall survival (OS) and progression-free survival (PFS) for the steroid group compared to those not using steroids.
  • The findings highlight the need for further research on how steroids affect treatment outcomes in BM patients receiving ICI, particularly regarding dosage and timing.
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Glioblastoma is associated with a poor prognosis. Even though survival statistics are well-described at the population level, it remains challenging to predict the prognosis of an individual patient despite the increasing number of prognostic models. The aim of this study is to systematically review the literature on prognostic modeling in glioblastoma patients.

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Neurosurgical guidelines are fundamental for evidence-based practice and have considerably increased both in number and content over the last decades. Yet, guidelines in neurosurgery are not without limitations, as they are overwhelmingly based on low-level evidence. Such recommendations have in the past been occasionally overturned by well-designed randomized controlled trials (RCTs), demonstrating the volatility of poorly underpinned evidence.

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  • Glioblastoma has a median survival of 15 months, prompting the need for new treatment strategies; this study reviews the impact of beta-blockers on glioma growth based on existing literature.* -
  • The systematic search yielded 10 preclinical studies and 1 clinical study, revealing that beta-blockers may reduce glioma cell proliferation, migration, and enhance drug sensitivity, though results on migration were inconsistent.* -
  • While preclinical evidence suggests potential mechanisms for beta-blockers against glioma, the single clinical study found no survival benefit, highlighting the need for further research to determine their effectiveness in clinical outcomes.*
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Introduction: The role for steroids in acute spinal cord injury (ASCI) remains unclear; while some studies have demonstrated the risks of steroids outweigh the benefits,a meta-analyses conducted on heterogeneous patient populations have shown significant motor improvement at short-term but not at long-term follow-up. Given the heterogeneity of the patient population in previous meta-analyses and the publication of a recent trial not included in these meta-analyses, we sought to re-assess and update the safety and short-term and long-term efficacy of steroid treatment following ASCI in a more homogeneous patient population.

Materials And Methods: A literature search was conducted on PubMed, EMBASE and Cochrane Library through June 2019 for studies evaluating the utility of steroids within the first 8 h following ASCI.

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