Publications by authors named "Brett J Theeler"

Article Synopsis
  • * This study analyzed treatment patterns within the Department of Defense's Military Health System, comparing the direct care (DC) and private sector care (PSC) networks for patients diagnosed with malignant brain tumors from 1999 to 2014.
  • * Results showed that while the type of initial treatment was similar across both care settings, the time to treatment was significantly longer in PSC (12 days) compared to DC (6 days), with a higher percentage of patients in PSC starting treatment after the recommended 28-day period.
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Purpose: Multidisciplinary tumor boards (MTBs) integrate clinical, molecular, and radiological information and facilitate coordination of neuro-oncology care. During the COVID-19 pandemic, our MTB transitioned to a virtual and multi-institutional format. We hypothesized that this expansion would allow expert review of challenging neuro-oncology cases and contribute to the care of patients with limited access to specialized centers.

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Background: Glioblastoma (GBM) is the most aggressive primary brain malignancy with <45% living a year beyond diagnosis. Previously published investigations of long-term survivors (LTS) provided clinical data but rarely incorporated a comprehensive clinical and molecular analysis. Herein, we identify clinical, imaging, molecular, and outcome features for 23 GBM-LTS patients and compare them with a matched cohort of short-term survivors (STS).

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Craniopharyngiomas are tumors that arise from the remnants of Rathke's pouch along the nasopharynx to the diencephalon. Current standard of care includes maximal surgical resection versus adjuvant radiation if a maximal resection is unfeasible. Pharmacological therapy with MAPK targeted agents is an emerging therapeutic option for tumors with BRAF V600E mutations.

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Purpose: Cancer patients experience distress and anxiety when undergoing imaging studies to monitor disease status, yet these symptoms are not always appropriately identified or well-managed. This interim analysis of a phase 2 clinical trial explored feasibility and acceptability of a virtual reality relaxation (VR) intervention for primary brain tumor (PBT) patients at the time of clinical evaluation.

Methods: English speaking, adult PBT patients with previous reports of distress and upcoming neuroimaging were recruited between March of 2021 and March 2022.

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Article Synopsis
  • Cancer patients often face anxiety during imaging studies, leading to the need for effective management of their distress.
  • A phase 2 clinical trial tested a virtual reality relaxation (VR) intervention for primary brain tumor patients, assessing its feasibility and acceptability before neuroimaging.
  • Out of 55 approached, 20 patients enrolled, with high satisfaction reported (90%) and minimal adverse effects, indicating the potential of VR as a supportive tool for managing psychological symptoms in this population.
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  • Financial toxicity, especially linked to unemployment, has a significant impact on cancer survivors, prompting an evaluation of how it relates to patient-reported outcomes (PROs) in individuals with primary CNS tumors (PCNST).
  • The study, conducted between September 2016 and December 2019 with 277 participants, revealed that Hispanic individuals faced higher unemployment rates and reported greater functional impairments and reduced health-related quality of life (HRQOL) than employed counterparts.
  • Unemployed participants exhibited notably higher levels of depressive (25% vs. 8%) and anxiety symptoms (30% vs. 15%), highlighting the mental health challenges associated with unemployment in this patient group.
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  • Cognitive impairments are common in patients with primary CNS tumors, and traditional neuropsychological assessments are often too lengthy for routine use, prompting the study of the brief Montreal Cognitive Assessment (MoCA) during in-person and telehealth visits.
  • The study involved 71 adults with CNS tumors who took the MoCA, revealing an average score of 25 in-person and 26 via telehealth, with a notable percentage scoring abnormally; satisfaction surveys indicated healthcare providers found the MoCA useful in both settings.
  • Findings demonstrated a correlation between lower MoCA scores and worse symptoms, emphasizing the importance of incorporating both objective cognitive measures and patient-reported outcomes for a comprehensive understanding of patient cognition in neuro-oncology care.
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Introduction: Despite an increasing aging population, older adults (≥ 65 years) with primary brain tumors (PBTs) are not routinely assessed for geriatric vulnerabilities. Recent reports of geriatric assessment (GA) in patients with glioblastomas demonstrated that GA may serve as a sensitive prognosticator of overall survival. Yet, current practice does not include routine evaluation of geriatric vulnerabilities and the relevance of GA has not been previously evaluated in broader cohorts of PBT patients.

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Purpose: Prior research suggested the increased likelihood of brain cancer diagnosis following certain psychiatric diagnoses. This association may result from detection bias or suggest an early sign for brain cancer. This study investigated whether psychiatric illness may be an early manifestation of brain cancer while considering potential effects of detection bias.

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ONC206 is an imipridone derivative that is being developed clinically as a single agent given orally in a first-in-human trial (NCT04541082). This ongoing clinical trial requires pharmacokinetic analysis of ONC206 to fully characterize its pharmacologic profile. There is currently no published bioanalytical method for ONC206 quantitation.

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Article Synopsis
  • Primary CNS tumors lead to significant symptoms and a poor prognosis, prompting a study on long-term survivors (≥5 years) to evaluate their reported outcomes.
  • Data from 248 adult survivors revealed that while 42% reported no moderate-to-severe symptoms, many experienced issues like fatigue and cognitive difficulties, with significant anxiety and depression reported by some.
  • The study highlights the need for tailored survivorship care programs, as survivors exhibited diverse symptom experiences regardless of tumor characteristics, indicating ongoing support and research are essential.
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Purpose: To investigate the toxicity profile and establish an optimal dosing schedule of zotiraciclib with temozolomide in patients with recurrent high-grade astrocytoma.

Patients And Methods: This two-stage phase I trial determined the MTD of zotiraciclib combined with either dose-dense (Arm1) or metronomic (Arm2) temozolomide using a Bayesian Optimal Interval design; then a randomized cohort expansion compared the progression-free survival rate at 4 months (PFS4) of the two arms for an efficient determination of a temozolomide schedule to combine with zotiraciclib at MTD. Pharmacokinetic and pharmacogenomic profiling were included.

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Glioma is the most common primary malignant brain tumor with a poor prognosis. Immune checkpoint inhibitors have been of great interest in investigation of glioma treatments. Here, we report single-cell transcriptomic analyses of two tumor areas from an oligodendroglioma taken from a patient who had multiple tumor recurrences, following several chemotherapies and radiation treatments.

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Adult pilocytic astrocytoma (PA) is less prevalent than pediatric PA and is associated with a worse prognosis. In a literature review, we found that 88.3% of the molecular alterations in adult PA are associated with MAPK pathway dysregulation.

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Background: Medulloblastoma (MB) is a rare brain tumor occurring more frequently in children in whom research has been primarily focused. Treatment recommendations in adults are mainly based on retrospective data and pediatric experience; however, molecular features and treatment tolerance differ between the 2 age groups. In adults, prognostic tools are suboptimal, late recurrences are typical, and long-term sequelae remain understudied.

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Histone mutations occur in approximately 4% of different cancer types. In 2012, mutations were found in the gene encoding histone variant H3.3 ( gene) in pediatric diffuse intrinsic pontine gliomas and pediatric hemispheric gliomas.

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Background: Glioma is the most common malignant brain cancer. Accessibility to health care is an important factor affecting cancer outcomes in the US general population. The US Military Health System (MHS) provides universal health care to its beneficiaries.

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Pancreatic cancer is the fourth leading cause of cancer-related death with a median survival of 3-11 months when metastatic. We present a patient with metastatic pancreatic cancer and an exceptional response to initial systemic chemotherapy with FOLFIRINOX (fluorouracil, leucovorin, irinotecan, and oxaliplatin). Despite evidence of disease control on body imaging, he developed symptomatic leptomeningeal disease and brain metastases 29 months into treatment.

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Background: Immune checkpoint inhibitors (ICPIs) are being investigated in clinical trials for patients with glioblastoma. While these therapies hold great promise, management of the patients receiving such treatment can be complicated due to the challenges in recognizing immune-related adverse events caused by checkpoint inhibitor treatment. Brain imaging changes that are the consequence of an inflammatory response may be misinterpreted as disease progression leading to inappropriate premature cessation of treatment.

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Background: Rosette forming glioneuronal tumors are rare, World Health Organization (WHO) grade I novel tumors frequently affecting the fourth ventricle or posterior fossa with typical neuronal pseudorosettes. RGNTs have been described as possessing additional histologic features of DNETs or pilocytic astrocytomas. Activating PIK3CA mutations have been identified as recurring genetic event in RGNTs.

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