MRD4U: A path to development for personalized liquid biopsy for children with central nervous system tumors.

Background: Liquid biopsy assays using cerebrospinal fluid (CSF) can revolutionize care for children with central nervous system (CNS) tumors by enabling precise monitoring of therapeutic responses and detecting recurrence or measurable residual disease (MRD). These assays can detect cell-free, circulating tumor DNA (ctDNA) via somatic alterations, though accurately measuring low-abundance ctDNA in CSF is challenging.

Methods: Our research focused on the optimization of next-generation sequencing library preparation from cell-free DNA (cfDNA), evaluating four commercial kits to address the low nucleic acid yield in CSF-derived cfDNA.

Comprehensive Genomic Characterization of Congenital and Infantile Cancers Reveals High Yield of Medically Meaningful Findings.

Purpose: We describe findings from genomic profiling of tumors among infantile pediatric patients studied within a translational research protocol established at our pediatric tertiary care center. Comprehensive genomic profiling was initiated to aid in diagnosis, prognostication, treatment, and detection of germline disease predisposition in this patient cohort.

Methods: Enhanced exome sequencing of disease and comparator tissue was coupled with RNA sequencing of the disease-involved specimen to assess for single nucleotide variation, insertion/deletions, copy number alteration, structural variation, fusions, and methylation profiling-based tumor classification scores.

Immunohistochemical assessment and clinical, histopathologic, and molecular correlates of membranous somatostatin type-2A receptor expression in high-risk pediatric central nervous system tumors.

Introduction: Lu-DOTATATE, a radionuclide therapy that binds somatostatin type-2A receptors (SST2A), has demonstrated efficacy in neuroendocrine tumors and evidence of central nervous system (CNS) penetration, supporting potential expansion within pediatric neuro-oncology. Understanding the prevalence of SST2A expression across pediatric CNS tumors is essential to identify patients who may benefit from somatostatin receptor-targeted therapy and to further elucidate the oncogenic role of SST2A.

Methods: SST2A immunohistochemistry (IHC) was performed on tumor specimens and interpreted by an experienced pathologist (blinded), utilizing semi-quantitative scoring of membranous expression within viable tumor.

Risk of secondary malignant neoplasms in children following proton therapy vs. photon therapy for primary CNS tumors: A systematic review and meta-analysis.

Background: Central nervous system tumors are now the most common primary neoplasms seen in children, and radiation therapy is a key component in management. Secondary malignant neoplasms (SMNs) are rare, but dreaded complications. Proton beam therapy (PBT) can potentially minimize the risk of SMNs compared to conventional photon radiation therapy (RT), and multiple recent studies with mature data have reported the risk of SMNs after PBT.

Medulloblastoma in the Modern Era: Review of Contemporary Trials, Molecular Advances, and Updates in Management.

Critical discoveries over the past two decades have transformed our understanding of medulloblastoma from a single entity into a clinically and biologically heterogeneous disease composed of at least four molecularly distinct subgroups with prognostically and therapeutically relevant genomic signatures. Contemporary clinical trials also have provided valuable insight guiding appropriate treatment strategies. Despite therapeutic and biological advances, medulloblastoma patients across the age spectrum experience tumor- and treatment-related morbidity and mortality.

Comorbidity Burden in a Cohort of Adolescent and Young Adult Patients Diagnosed with Central Nervous System Tumors and Sarcomas.

Adolescent and young adult (AYA) oncology patients experience unique biological, behavioral, and socioeconomic challenges, for which provision of care must be tailored. AYAs with central nervous system (CNS) tumors and sarcomas represent a vulnerable population with worse outcomes and potential for serious sequelae from intense multimodal therapy. Comorbidity burden impacts treatment tolerance, adherence, and efficacy, yet has been understudied among these high-risk AYA patients.

Volumetric endpoints in diffuse intrinsic pontine glioma: comparison to cross-sectional measures and outcome correlations in the International DIPG/DMG Registry.

Background: Cross-sectional tumor measures are traditional clinical trial endpoints; however volumetric measures may better assess tumor growth. We determined the correlation and compared the prognostic impact of cross-sectional and volumetric measures of progressive disease (PD) among patients with DIPG.

Methods: Imaging and clinical data were abstracted from the International DIPG Registry.

A pilot radiogenomic study of DIPG reveals distinct subgroups with unique clinical trajectories and therapeutic targets.

An adequate understanding of the relationships between radiographic and genomic features in diffuse intrinsic pontine glioma (DIPG) is essential, especially in the absence of universal biopsy, to further characterize the molecular heterogeneity of this disease and determine which patients are most likely to respond to biologically-driven therapies. Here, a radiogenomics analytic approach was applied to a cohort of 28 patients with DIPG. Tumor size and imaging characteristics from all available serial MRIs were evaluated by a neuro-radiologist, and patients were divided into three radiographic response groups (partial response [PR], stable disease [SD], progressive disease [PD]) based on MRI within 2 months of radiotherapy (RT) completion.

Characterizing temporal genomic heterogeneity in pediatric low-grade gliomas.

Recent discoveries have provided valuable insight into the genomic landscape of pediatric low-grade gliomas (LGGs) at diagnosis, facilitating molecularly targeted treatment. However, little is known about their temporal and therapy-related genomic heterogeneity. An adequate understanding of the evolution of pediatric LGGs' genomic profiles over time is critically important in guiding decisions about targeted therapeutics and diagnostic biopsy at recurrence.

Trametinib-associated Hyponatremia in a Child With Low-grade Glioma is Not Seen Following Treatment With Alternative MEK Inhibitor.

Molecularly targeted therapy with MEK inhibitors has been increasingly incorporated into the treatment of pediatric low-grade gliomas, but this promising therapy is associated with distinctive and specific toxicities. Understanding life-threatening MEK inhibitor toxicities and their management is critical to MEK inhibitor safety, especially among young children. This report describes severe hyponatremia associated with trametinib in an infant with progressive low-grade glioma without underlying endocrine dysfunction, which recurred despite significant dose reduction.

Online Simulated Cases Assess Retention of Virtual Neighborhood Tour Curriculum.

Background Learning to identify and address social determinants of health (SDH) is a crucial component of pediatric residency training. A virtual tour of an impoverished neighborhood previously demonstrated efficacy in increasing residents' self-assessed knowledge and competence, but its impact on performance has not yet been reported. Online simulated cases are emerging as feasible assessment tools to measure trainees' skills across various healthcare settings.

Stress, Depression, and Quality of Life Among Caregivers of Children With Osteogenesis Imperfecta.

Introduction: The purpose of this study was to evaluate stress, depressive symptoms, and quality of life (QOL) among caregivers of children with osteogenesis imperfecta (OI) and to determine if associations exist with patient disease-related characteristics.

Methods: Psychosocial outcomes were evaluated in 33 caregivers of 31 patients with OI using the Pediatric Inventory for Parents (assessing stress), PedsQL Family Impact Module (assessing QOL), and Center for Epidemiologic Studies Depression Scale (assessing depressive symptoms).

Results: Higher levels of patient pain and lower patient physical functioning were significantly associated with both higher caregiver stress and poorer QOL (p < .

Cyclic bisphosphonate therapy reduces pain and improves physical functioning in children with osteogenesis imperfecta.

Background: Children with osteogenesis imperfecta (OI) experience pain and impaired physical functioning. The longitudinal effect of cyclic bisphosphonate treatment on these symptoms has not been described. We serially evaluated pain and functioning in pediatric patients with OI treated with intravenous bisphosphonate therapy.

Modernizing Training on Social Determinants of Health: A Virtual Neighborhood Tour is Noninferior to an in-Person Experience.

Using innovative technology to teach about social determinants of health might address current training barriers related to standardization, sustainability, and scalability. A virtual tour of an impoverished neighborhood that used 360° videos was noninferior to the previous in-person experience.

Transition zones between healthy and diseased retina in choroideremia (CHM) and Stargardt disease (STGD) as compared to retinitis pigmentosa (RP).

Purpose: To describe the structural changes across the transition zone (TZ) in choroideremia (CHM) and Stargardt disease (STGD) and to compare these to the TZ in retinitis pigmentosa (RP).

Methods: Frequency-domain (Fd)OCT line scans were obtained from seven patients with CHM, 20 with STGD, and 12 with RP and compared with those of 30 previously studied controls. A computer-aided manual segmentation procedure was used to determine the thicknesses of the outer segment (OS) layer, the outer nuclear layer plus outer plexiform layer (ONL+), the retinal pigment epithelium plus Bruch's membrane (RPE+BM), and the outer retina (OR).

Autofluorescence imaging and spectral-domain optical coherence tomography in incomplete congenital stationary night blindness and comparison with retinitis pigmentosa.

Purpose: To test the hypothesis that the evaluation of retinal structure can have diagnostic value in differentiating between incomplete congenital stationary night blindness (CSNB2) and retinitis pigmentosa (RP). To compare retinal thickness differences between patients with CSNB2 and myopic controls.

Design: Prospective cross-sectional study.

Quantification of peripapillary sparing and macular involvement in Stargardt disease (STGD1).

Purpose: To quantify and compare structure and function across the macula and peripapillary area in Stargardt disease (STGD1).

Methods: Twenty-seven patients (27 eyes) and 12 age-similar controls (12 eyes) were studied. Patients were classified on the basis of full-field electroretinogram (ERG) results: Fundus autofluorescence (FAF) and spectral domain-optical coherence tomography (SD-OCT) horizontal line scans were obtained through the fovea and peripapillary area.

The transition zone between healthy and diseased retina in patients with retinitis pigmentosa.

Purpose: To describe the structural changes in the transition zone from relatively healthy retinal regions to severely affected regions in patients with retinitis pigmentosa (RP) using frequency domain optical coherence tomography (fdOCT).

Methods: FdOCT line scans of the horizontal meridian were obtained from one eye of 13 patients with RP and 30 control subjects. The patients had normal or near normal foveal sensitivities and visual field diameters ≥10°.

Thickness of receptor and post-receptor retinal layers in patients with retinitis pigmentosa measured with frequency-domain optical coherence tomography.

Purpose: To better understand the effects of retinitis pigmentosa (RP) on post-receptor anatomy, the thicknesses of the receptor, inner nuclear, retinal ganglion cell (RGC), and retinal nerve fiber layers (RNFL) were measured with frequency-domain optical coherence tomography (fdOCT).

Methods: FdOCT scans were obtained from the horizontal midline in 30 patients with RP and 23 control subjects of comparable age. Raw images were exported and the thicknesses of photoreceptor/RPE, inner nuclear, RGC plus inner plexiform, and nerve fiber layers were measured with a manual segmentation procedure aided by a computer program.