Mixed Neuronal-Glial Tumor

1. Disease Information

2026-06-30
Falcon MONDO:0016729 Model: Edison Scientific Literature 44 citations

1. Disease Information

Overview

Mixed neuronal-glial tumors (also termed glioneuronal tumors) are a heterogeneous group of rare primary central nervous system (CNS) neoplasms composed of both neuronal and glial cell populations in varying proportions (crainic2023rareneuronalglial pages 1-2). They represent less than 2% of all primary CNS tumors and predominantly affect children and young adults, with a strong predilection for the temporal and frontal lobes and a frequent association with epilepsy (crainic2023rareneuronalglial pages 1-2, vaz2022uncommonglioneuronaltumors pages 1-4). The 2021 WHO Classification of Tumors of the Central Nervous System (CNS5, 5th edition) reorganized these tumors into one of six families: "Glioneuronal and neuronal tumors," alongside closely related entities in the "Pediatric-type diffuse low-grade gliomas" and "Circumscribed astrocytic gliomas" families (bale2022the2021who pages 1-2, bale2022the2021who pages 2-3).

Key Identifiers

  • MONDO ID: MONDO:0016729 (mixed neuronal-glial tumor) (OpenTargets Search: mixed neuronal-glial tumor,ganglioglioma,glioneuronal tumor)
  • ICD-O-3 codes: Multiple codes apply depending on subtype (e.g., 9505/1 for ganglioglioma, 9413/0 for DNET)
  • MeSH: Glioneuronal tumors / Neuronal and mixed neuronal-glial tumors
  • Common Synonyms: Glioneuronal tumor, mixed glioneuronal neoplasm, neuronal-glial tumor

Subtypes per WHO 2021 Classification

The following table provides a comprehensive overview of subtypes, grades, molecular features, histopathology, age of onset, and clinical presentation:

Table (click to expand)
Tumor type WHO 2021 status / grade Key molecular alterations Characteristic histology / IHC markers Typical age of onset Common clinical presentation
Ganglioglioma CNS WHO grade 1 BRAF p.V600E most common; less often FGFR1, KRAS, NF1, H3-3A/H3 K27M, RAF1 alterations; MAPK-pathway activation (pereira2026molecularfeaturesin pages 1-2, pereira2026molecularfeaturesin pages 2-4, crainic2023rareneuronalglial pages 6-8) Dysmorphic neuronal cells with neoplastic glial component; eosinophilic granular bodies, lymphocytic infiltrates, CD34+ ramified cells; neuronal cells synaptophysin+/chromogranin A+; glial cells GFAP+/OLIG2+; Ki-67 usually <3% (crainic2023rareneuronalglial pages 6-8, vaz2022uncommonglioneuronaltumors pages 1-4) Usually childhood to young adulthood (vaz2022uncommonglioneuronaltumors pages 1-4, crainic2023rareneuronalglial pages 1-2) Long-standing focal epilepsy/seizures, often temporal lobe; headaches less common (crainic2023rareneuronalglial pages 1-2, vaz2022uncommonglioneuronaltumors pages 1-4)
Dysembryoplastic neuroepithelial tumor (DNET) CNS WHO grade 1 FGFR1 alterations in >75%; BRAF p.V600E in <1/3; MAPK-pathway altered (crainic2023rareneuronalglial pages 6-8, kobow2021moleculardiagnosticsin pages 2-4) Specific glioneuronal element with columns of oligodendroglia-like cells in myxoid matrix and “floating neurons”; Olig2+ oligodendroglia-like cells; floating neurons NeuN+/synaptophysin+ (crainic2023rareneuronalglial pages 6-8) Usually children/adolescents and young adults (crainic2023rareneuronalglial pages 1-2) Drug-resistant epilepsy, often cortical/temporal lesions (crainic2023rareneuronalglial pages 1-2, xie2023lowgradeepilepsyassociatedneuroepithelial pages 2-3)
Papillary glioneuronal tumor CNS WHO grade 1 SLC44A1::PRKCA fusion characteristic; occasional PDGFRA alterations reported (crainic2023rareneuronalglial pages 4-5, vaz2022uncommonglioneuronaltumors pages 4-6) Pseudopapillary / papillary architecture with GFAP+/S100+ glial lining cells and synaptophysin+/neuronal nuclear protein+ interpapillary neuronal elements; OLIG2+ oligodendrocyte-like cells may be present (vaz2022uncommonglioneuronaltumors pages 4-6) Mostly young adults (crainic2023rareneuronalglial pages 4-5) Seizures and/or headaches from circumscribed supratentorial mass (crainic2023rareneuronalglial pages 4-5, crainic2023rareneuronalglial pages 1-2)
Rosette-forming glioneuronal tumor (RGNT) CNS WHO grade 1 FGFR1 hotspot mutations, often with PIK3CA, PIK3R1, or NF1 co-alterations (crainic2023rareneuronalglial pages 4-5, vaz2022uncommonglioneuronaltumors pages 6-7) Neurocytic rosettes and perivascular pseudorosettes with astrocytic component; neuronal cells synaptophysin+/MAP2+/NSE+; glial cells GFAP+/OLIG2+/S100+ (vaz2022uncommonglioneuronaltumors pages 6-7) Typically children/young adults (vaz2022uncommonglioneuronaltumors pages 1-4, crainic2023rareneuronalglial pages 4-5) Headache, ataxia, hydrocephalus, posterior fossa / fourth-ventricle symptoms rather than epilepsy (vaz2022uncommonglioneuronaltumors pages 6-7, crainic2023rareneuronalglial pages 4-5)
Diffuse leptomeningeal glioneuronal tumor (DLGNT) CNS WHO grade 1 in WHO 2021; methylation subclasses MC-1 and MC-2 described (vaz2022uncommonglioneuronaltumors pages 6-7, singh2023currentstatusof pages 3-4) Frequently KIAA1549::BRAF fusion; also 1p loss and MAPK-pathway alterations; molecular subclassing by methylation clinically relevant (vaz2022uncommonglioneuronaltumors pages 6-7, singh2023currentstatusof pages 3-4, bent2025updatedeanoguideline pages 3-4) Oligodendroglial-like cells in leptomeningeal/desmoplastic or myxoid background; OLIG2+, S100+, MAP2+ in oligodendroglial cells, GFAP+ astrocytic component (vaz2022uncommonglioneuronaltumors pages 6-7) Mainly pediatric, but can occur across ages (singh2023currentstatusof pages 3-4, rio2024newcnstumor pages 2-4) Signs of diffuse leptomeningeal disease: hydrocephalus, cranial/spinal symptoms, multifocal neurologic deficits; epilepsy less typical (vaz2022uncommonglioneuronaltumors pages 6-7)
Myxoid glioneuronal tumor (MGT/MGNT) CNS WHO grade 1 Recurrent PDGFRA p.K385 mutation; DNT-like methylation profile (bale2022the2021who pages 8-9, capper2023eanoguidelineon pages 11-12) Oligodendrocyte-like cells in prominent myxoid/mucin-rich stroma with floating neurons and sometimes neurocytic rosettes; strong MAP2/synaptophysin in neuronal component, often GFAP-negative (bale2022the2021who pages 5-6, vaz2022uncommonglioneuronaltumors pages 6-7, bale2022the2021who pages 8-9) Usually children and young adults (bale2022the2021who pages 8-9) Seizures or headaches; often septum pellucidum / periventricular lesion discovered on imaging (bale2022the2021who pages 8-9, rio2024newcnstumor pages 2-4)
Diffuse glioneuronal tumor with oligodendroglioma-like features and nuclear clusters (DGONC) Provisional new type in WHO 2021 glioneuronal/neuronal family Distinct methylation class; recurrent monosomy 14 / chromosome 14 methylome abnormality (bale2022the2021who pages 1-2, xie2023lowgradeepilepsyassociatedneuroepithelial pages 2-3, bale2022the2021who pages 8-9) Diffuse tumor with oligodendroglioma-like perinuclear halos and clustered nuclei; synaptophysin+/NeuN+/MAP2+/Olig2+, usually GFAP− or limited GFAP (crainic2023rareneuronalglial pages 5-6, bale2022the2021who pages 3-5) Predominantly pediatric / young patients (bale2022the2021who pages 1-2, xie2023lowgradeepilepsyassociatedneuroepithelial pages 2-3) Seizures and focal neurologic symptoms depending on cortical location (bale2022the2021who pages 3-5, xie2023lowgradeepilepsyassociatedneuroepithelial pages 2-3)
Desmoplastic infantile ganglioglioma (DIG) CNS WHO grade 1 Molecular drivers less consistently defined than other entities; belongs to infantile glioneuronal spectrum in WHO 2021 (vaz2022uncommonglioneuronaltumors pages 1-4, rio2024newcnstumor pages 2-4) Desmoplastic stroma with astroglial and neuronal/ganglion cell elements; glial cells GFAP+, neuronal cells synaptophysin+ (vaz2022uncommonglioneuronaltumors pages 1-4, rio2024newcnstumor pages 2-4) Infancy, usually within first 2 years of life (vaz2022uncommonglioneuronaltumors pages 1-4) Macrocephaly, enlarging head circumference, seizures, signs of raised intracranial pressure from large superficial cystic/solid mass (vaz2022uncommonglioneuronaltumors pages 1-4, rio2024newcnstumor pages 2-4)
Polymorphous low-grade neuroepithelial tumor of the young (PLNTY) Pediatric-type diffuse low-grade glioma in WHO 2021 (not in glioneuronal family, but overlaps clinically/pathologically with LEATs) (bale2022the2021who pages 1-2, rio2024newcnstumor pages 2-4) MAPK-pathway altered; BRAF p.V600E, FGFR2/FGFR3 fusions and related FGFR-family alterations (singh2023currentstatusof pages 3-4, bale2022the2021who pages 3-5, bale2022the2021who pages 8-9) Oligodendroglioma-like / polymorphous infiltrative tumor; strong CD34 expression; strong MAP2 and synaptophysin, mostly GFAP-negative; may show perivascular pseudorosettes (bale2022the2021who pages 3-5, bale2022the2021who pages 8-9) Children, adolescents, young adults (bale2022the2021who pages 1-2, bale2022the2021who pages 8-9) Epileptogenic cortical tumor with chronic focal seizures (singh2023currentstatusof pages 3-4, bale2022the2021who pages 8-9)
Multinodular and vacuolating neuronal tumor (MVNT) CNS WHO grade 1 MAPK-pathway alterations reported; recognized as new WHO 2021 neuronal/glioneuronal-type entity (bale2022the2021who pages 1-2, xie2023lowgradeepilepsyassociatedneuroepithelial pages 2-3) Multinodular lesion composed of vacuolated neuronal cells; HuC/HuD+, OLIG2+, α-internexin+, weak/negative synaptophysin and neurofilament in some cells (vaz2022uncommonglioneuronaltumors pages 8-9, bale2022the2021who pages 5-6) Often adults, but can occur across a wide age range (bale2022the2021who pages 5-6, rio2024newcnstumor pages 2-4) Often incidental; may present with seizures or headaches (bale2022the2021who pages 5-6, vaz2022uncommonglioneuronaltumors pages 8-9)
Anaplastic ganglioglioma CNS WHO grade 3 May harbor BRAF p.V600E and occasionally H3 alterations; MAPK-driven biology in subset (vaz2022uncommonglioneuronaltumors pages 1-4, vaz2022uncommonglioneuronaltumors pages 4-6) Dysplastic neuronal cells plus anaplastic glial component, increased cellularity, pleomorphism, frequent mitoses, microvascular proliferation, necrosis; GFAP+/synaptophysin+/CD34+ pattern retained in components (vaz2022uncommonglioneuronaltumors pages 1-4, vaz2022uncommonglioneuronaltumors pages 4-6) Children to adults (vaz2022uncommonglioneuronaltumors pages 1-4, crainic2023rareneuronalglial pages 6-8) Seizures, progressive focal deficits, mass effect; more aggressive course than grade 1 ganglioglioma (crainic2023rareneuronalglial pages 6-8, vaz2022uncommonglioneuronaltumors pages 1-4)
Central neurocytoma CNS WHO grade 2 No single pathognomonic alteration routinely used in WHO; molecular heterogeneity reported (vaz2022uncommonglioneuronaltumors pages 8-9, rio2024newcnstumor pages 2-4) Uniform round neurocytic cells with scant cytoplasm and neurocytic rosettes; synaptophysin+ and neuron-specific enolase+; OLIG2− (vaz2022uncommonglioneuronaltumors pages 8-9) Young adults (median around 30 years) (crainic2023rareneuronalglial pages 4-5) Intraventricular mass causing headache, hydrocephalus, visual symptoms; seizures less common (crainic2023rareneuronalglial pages 4-5, vaz2022uncommonglioneuronaltumors pages 8-9)
Extraventricular neurocytoma CNS WHO grade 2 FGFR1::TACC1 fusion in about two-thirds in one series/reviewed cohort (crainic2023rareneuronalglial pages 4-5) Neurocytic tumor outside ventricles; synaptophysin+ neuronal phenotype, similar to central neurocytoma but extraventricular location (crainic2023rareneuronalglial pages 4-5, rio2024newcnstumor pages 2-4) Young adults (median around 30 years) (crainic2023rareneuronalglial pages 4-5) Seizures and headaches are common (crainic2023rareneuronalglial pages 4-5)

Table: This table summarizes major mixed neuronal-glial and closely related neuroepithelial tumor subtypes relevant to the WHO 2021 CNS classification, with practical emphasis on grade, molecular drivers, pathology, age, and presentation. It is useful as a quick reference for disease characterization and knowledge-base curation.


2. Etiology

Disease Causal Factors

Mixed neuronal-glial tumors are primarily driven by somatic genetic alterations, particularly those activating the mitogen-activated protein kinase (MAPK) signaling pathway. Gene expression studies have identified alterations in the RAS–RAF–MAPK and PI3K–AKT–mTOR signaling pathways, which affect cell proliferation, differentiation, autophagy, protein synthesis, and cell survival (kobow2021moleculardiagnosticsin pages 2-4). Experimental evidence demonstrates that BRAF V600E mutations in neural progenitors during embryonic development can reproduce ganglioglioma histopathological features and lead to epileptic seizures (kobow2021moleculardiagnosticsin pages 2-4). The tumors are generally considered developmental or hamartomatous neoplasms arising from aberrant neurodevelopment rather than from acquired environmental exposures.

Genetic Risk Factors

Environmental and Lifestyle Risk Factors

No specific environmental or lifestyle risk factors have been consistently identified for mixed neuronal-glial tumors. These tumors are not associated with known carcinogen exposures, ionizing radiation, or infectious agents based on current evidence. The primary etiologic mechanism appears to be somatic genetic alteration during neural development.

Gene-Environment Interactions

No well-established gene-environment interactions have been documented for this tumor group. The predominantly somatic, developmental nature of the underlying genetic alterations suggests limited environmental modulation.


3. Phenotypes

Primary Phenotypes

Seizures / Epilepsy (HP:0001250) - Type: Symptom (neurological) - Characteristics: Drug-resistant focal epilepsy is the hallmark presentation; seizures are present in the vast majority of cases, often with onset at a young age and a long-term history (crainic2023rareneuronalglial pages 1-2, vaz2022uncommonglioneuronaltumors pages 1-4). Ganglioglioma and DNET have been informally termed "epileptomas" due to their extremely high epileptogenic potential (crainic2023rareneuronalglial pages 1-2). - Onset: Childhood to young adulthood - Severity: Often medically refractory (drug-resistant) - Frequency: >80% of gangliogliomas and DNETs

Headache (HP:0002315) - Type: Symptom - Characteristics: Less common than seizures; may present in tumors causing mass effect or hydrocephalus - Frequency: Variable, more common in posterior fossa tumors (RGNT) and central neurocytoma

Focal neurological deficits (HP:0007340) - Type: Clinical sign - Characteristics: Depend on tumor location; may include motor weakness, sensory changes, visual field deficits - Onset: Variable; more common in aggressive subtypes (anaplastic ganglioglioma)

Hydrocephalus (HP:0000238) - Type: Clinical sign - Characteristics: Seen particularly with intraventricular tumors (central neurocytoma) and leptomeningeal spread (DLGNT)

Macrocephaly (HP:0000256) - Type: Physical manifestation - Characteristics: Particularly relevant to desmoplastic infantile ganglioglioma presenting in infancy

Quality of Life Impact: Chronic epilepsy significantly impairs quality of life, including cognitive development in children, educational achievement, employment, driving ability, and psychosocial functioning. Successful surgical resection with seizure freedom provides the greatest quality-of-life benefit.


4. Genetic/Molecular Information

Causal Genes and Pathogenic Variants

OpenTargets disease-target association analysis identified 8 key targets for mixed neuronal-glial tumor (MONDO:0016729), with PTEN (score 0.66), BRAF (score 0.63), FGFR1 (score 0.48), H3-3A (score 0.42), NTRK3 (score 0.38), IDH1 (score 0.37), ETV6 (score 0.37), and MUTYH (score 0.34) as the top associations (OpenTargets Search: mixed neuronal-glial tumor,ganglioglioma,glioneuronal tumor).

BRAF (HGNC:1097; ENSG00000157764): - V600E missense mutation: most frequent alteration in gangliogliomas at 36.32–36.94% (pereira2026molecularfeaturesin pages 1-2, pereira2026molecularfeaturesin pages 2-4) - Additional variants: duplications, in-frame insertions, and fusions including KIAA1549::BRAF (pereira2026molecularfeaturesin pages 2-4) - Somatic origin; constitutive activation of MAPK/ERK pathway - ClinVar: RCV000515781 for BRAF-mixed neuronal-glial tumor association

FGFR1 (HGNC:3688; ENSG00000077782): - Hotspot mutations N546K and K656E; present in 1.18% of gangliogliomas but dominant in DNETs (>75%) (engelhardt2022frequentfgfr1hotspot pages 1-2, pereira2026molecularfeaturesin pages 1-2, crainic2023rareneuronalglial pages 6-8) - FGFR activation phosphorylates kinase domains to activate Ras/Raf/MEK and PI3K-Akt pathways (engelhardt2022frequentfgfr1hotspot pages 1-2)

FGFR1::TACC1 fusion: Reported in approximately two-thirds of extraventricular neurocytomas (crainic2023rareneuronalglial pages 4-5)

SLC44A1::PRKCA fusion: Characteristic of papillary glioneuronal tumor (crainic2023rareneuronalglial pages 4-5, crainic2023rareneuronalglial pages 5-6, vaz2022uncommonglioneuronaltumors pages 4-6)

PDGFRA p.K385 mutation: Defining alteration for myxoid glioneuronal tumor (capper2023eanoguidelineon pages 11-12, bale2022the2021who pages 8-9)

Epigenetic Information

DNA methylation profiling has emerged as a critical diagnostic tool for classifying glioneuronal tumors. The DKFZ/Heidelberg CNS tumor classifier uses machine learning-based methylation analysis to distinguish tumor subtypes, and methylation classification confirmed or refined morphological diagnoses in a significant proportion of cases (singh2023currentstatusof pages 3-4). DLGNT shows two molecular subclasses (MC-1 and MC-2) based on distinct methylation profiles with different age presentations and survival outcomes (singh2023currentstatusof pages 3-4). DGONC is defined by a distinct methylation class associated with monosomy 14 (bale2022the2021who pages 1-2, xie2023lowgradeepilepsyassociatedneuroepithelial pages 2-3, bale2022the2021who pages 8-9).

Chromosomal Abnormalities


5. Environmental Information

No specific environmental toxins, radiation exposures, or lifestyle factors have been established as causative or contributory for mixed neuronal-glial tumors based on current evidence. No infectious agents have been implicated in the pathogenesis of these tumors.


6. Mechanism / Pathophysiology

Molecular Pathways

The central pathogenic mechanism involves constitutive activation of the RAS–RAF–MEK–ERK (MAPK) signaling cascade (kobow2021moleculardiagnosticsin pages 2-4, pereira2026molecularfeaturesin pages 4-5). BRAF V600E mutations cause constitutive kinase activation, leading to uncontrolled cell proliferation and oncogenic transformation. BRAF inhibitors work by selectively binding to V600E-mutated B-Raf proteins and preventing MEK activation (pereira2026molecularfeaturesin pages 4-5).

The PI3K–AKT–mTOR pathway also plays a role, particularly through co-mutations in PIK3CA and PIK3R1 observed in rosette-forming glioneuronal tumors (crainic2023rareneuronalglial pages 4-5). FGFR1 activation simultaneously stimulates both Ras/Raf/MEK and PI3K-Akt cascades (engelhardt2022frequentfgfr1hotspot pages 1-2).

Relevant GO terms: - GO:0000165 (MAPK cascade) - GO:0043066 (negative regulation of apoptotic process) - GO:0008284 (positive regulation of cell population proliferation) - GO:0048015 (phosphatidylinositol-mediated signaling)

Cellular Processes

  • Cell proliferation driven by constitutive MAPK activation
  • Aberrant neural progenitor differentiation during development
  • Epileptogenesis through cortical involvement and association with focal cortical dysplasia (FCD) (kobow2021moleculardiagnosticsin pages 2-4)

Relevant CL terms: - CL:0000540 (neuron) - CL:0000127 (astrocyte) - CL:0000128 (oligodendrocyte) - CL:0002319 (neural cell)

Causal Chain

Somatic mutation (e.g., BRAF V600E) in neural progenitor during embryonic development → constitutive MAPK/ERK pathway activation → aberrant cell proliferation and differentiation → formation of mixed neuronal-glial neoplasm in cortex → cortical disruption and epileptogenic zone formation → drug-resistant focal epilepsy (kobow2021moleculardiagnosticsin pages 2-4).


7. Anatomical Structures Affected

Primary Organs

Tissue and Cell Level

  • Neuronal cells: Dysmorphic ganglion cells (ganglioglioma), floating neurons (DNET), neurocytic rosettes (RGNT)
  • Glial cells: Astrocytic (GFAP+) and oligodendroglial (OLIG2+) components
  • Progenitor cells: CD34+ ramified cells characteristically present (vaz2022uncommonglioneuronaltumors pages 1-4)

8. Temporal Development

Onset

Progression


9. Inheritance and Population

Epidemiology

According to the CBTRUS Statistical Report (2014–2018), neuronal and mixed neuronal-glial tumors had an annual average of 58 cases and 5-year total of 290 cases in the United States, with an age-adjusted incidence rate (AAAIR) of 0.05 per 100,000 population (95% CI: 0.04–0.06) (ostrom2021cbtrusstatisticalreport pages 50-51). These tumors represent less than 2% of all primary CNS tumors (crainic2023rareneuronalglial pages 1-2).

Population Demographics

  • Age distribution: Predominantly affects children, adolescents, and young adults
  • Sex ratio: Most subtypes show no strong sex predilection, though some series report slight male predominance
  • Geographic distribution: No documented geographic clustering; reported worldwide
  • Inheritance: Almost exclusively somatic (non-hereditary) mutations. No Mendelian inheritance pattern. Rare association with NF1 (autosomal dominant predisposition syndrome).

10. Diagnostics

Clinical Tests

Imaging (MAXO:0000387 - imaging study): - MRI is the cornerstone of neuroimaging. Gangliogliomas typically appear as cortical/subcortical cystic-solid lesions with enhancement. DNETs often show cortical "bubbly" T2-hyperintense lesions without mass effect. Genotype-neuroimaging correlations have been identified: BRAF V600E tumors show indistinct borders with iso-T1/high-T2 signal (93.8% sensitivity, 100% specificity), while FGFR1-mutant tumors show sharp borders with very high T2 signal and diffuse mass effect (100% sensitivity and specificity) (iijima2024genotyperelevantneuroimagingfeatures pages 9-9).

Histopathology and Immunohistochemistry: - Ganglioglioma: Synaptophysin+/Chromogranin A+ neuronal cells, GFAP+/OLIG2+ glial cells, eosinophilic granular bodies, CD34+ stellate cells, Ki67 <3% (crainic2023rareneuronalglial pages 6-8, vaz2022uncommonglioneuronaltumors pages 1-4) - DNET: "Floating neurons" in myxoid matrix, NeuN+/synaptophysin+ neurons, Olig2+ oligodendroglia-like cells (crainic2023rareneuronalglial pages 6-8) - RGNT: Synaptophysin+/MAP2+/NSE+ neurocytic rosettes, GFAP+/OLIG2+/S100+ glial component (vaz2022uncommonglioneuronaltumors pages 6-7)

Molecular/Genetic Testing: The EANO guideline recommends next-generation sequencing (NGS) panel diagnostics rather than sequential target-specific testing, given the low prevalence (<5%) of individual targets in CNS tumors (capper2023eanoguidelineon pages 3-4). DNA methylation profiling using the DKFZ/Heidelberg classifier is increasingly essential for accurate subtyping (singh2023currentstatusof pages 3-4). The 2023 EANO molecular diagnostic tools guideline systematically reviews methods including NGS for DNA and RNA, methylome profiling, and immunohistochemistry for marker assessment (capper2023eanoguidelineon pages 3-4).

Differential Diagnosis

Key differential diagnoses include: pilocytic astrocytoma, oligodendroglioma (IDH-mutant, 1p/19q-codeleted), pleomorphic xanthoastrocytoma, angiocentric glioma, focal cortical dysplasia, and diffuse low-grade glioma (vaz2022uncommonglioneuronaltumors pages 4-6, bale2022the2021who pages 3-5).


11. Outcome/Prognosis

Survival and Mortality

  • Ganglioglioma (WHO grade 1): 10-year survival exceeds 80% with complete surgical resection (crainic2023rareneuronalglial pages 6-8). Gross total resection (GTR) improves both overall survival and seizure control compared to subtotal resection (STR) (crainic2023rareneuronalglial pages 6-8).
  • Ganglioglioma with PTPN11/KRAS/NF1 alterations: Significantly worse seizure outcomes (38% Engel I) compared to BRAF V600E-only gangliogliomas (85% Engel I), suggesting a clinically relevant adverse subgroup (pereira2026molecularfeaturesin pages 8-9).
  • DLGNT: Prognosis varies by methylation subclass; MC-1 and MC-2 have different survival outcomes (singh2023currentstatusof pages 3-4).
  • Anaplastic ganglioglioma (WHO grade 3): More aggressive clinical course with shorter survival.

Prognostic Factors


12. Treatment

Surgical Management (MAXO:0000004 - surgical procedure)

Gross total resection is the cornerstone of treatment and is considered curative for most WHO grade 1 glioneuronal tumors (crainic2023rareneuronalglial pages 1-2, crainic2023rareneuronalglial pages 6-8). For epilepsy-associated tumors, extended resection including the epileptogenic zone improves seizure-free outcomes (crainic2023rareneuronalglial pages 6-8). Temporal lobe surgeries generally achieve better seizure control than extratemporal resections.

Targeted Therapies (MAXO:0001525 - targeted therapy)

The following table summarizes the molecular targets and therapeutic options:

Table (click to expand)
Target/Gene Alteration Type Frequency in tumor subtype Associated tumor subtype(s) Targeted therapy options ESCAT classification / guideline status Clinical trial evidence (NCT)
BRAF p.V600E missense hotspot Ganglioglioma ~36.3–36.9%; DNET <1/3 of cases; PLNTY subset; broader mixed neuronal-glial tumor association in OpenTargets (pereira2026molecularfeaturesin pages 1-2, pereira2026molecularfeaturesin pages 2-4, crainic2023rareneuronalglial pages 6-8, bale2022the2021who pages 8-9, OpenTargets Search: mixed neuronal-glial tumor,ganglioglioma,glioneuronal tumor) Ganglioglioma, anaplastic ganglioglioma, DNET, PLNTY, other LEAT/glioneuronal tumors Dabrafenib + trametinib; vemurafenib; other BRAF inhibitors; BRAF/MEK combination preferred for progressive/recurrent disease after standard care (crainic2023rareneuronalglial pages 18-19, pereira2026molecularfeaturesin pages 4-5, capper2023eanoguidelineon pages 2-3, capper2023eanoguidelineon pages 9-10) Standard-of-care target in recurrent CNS tumors/glioneuronal tumors per EANO; highest actionability among reviewed targets (capper2023eanoguidelineon pages 2-3, bent2025updatedeanoguideline pages 1-2, capper2023eanoguidelineon pages 9-10) NCT02684058 (dabrafenib + trametinib, pediatric BRAF V600 tumors); pediatric long-term follow-up NCT03975829
BRAF KIAA1549::BRAF fusion / other BRAF fusions Common in some low-grade glioma/glioneuronal contexts; reported in DLGNT and pilocytic-spectrum tumors; not a dominant alteration in classic ganglioglioma (engelhardt2022frequentfgfr1hotspot pages 1-2, vaz2022uncommonglioneuronaltumors pages 6-7, bent2025updatedeanoguideline pages 3-4) Diffuse leptomeningeal glioneuronal tumor (DLGNT), pilocytic-spectrum tumors, some mixed neuronal-glial tumors MEK inhibitors or type II RAF inhibitors considered, preferably in trials for recurrent disease (capper2023eanoguidelineon pages 9-10) Therapeutically relevant in selected entities including DLGNT; EANO update notes growing relevance of fusion testing (bent2025updatedeanoguideline pages 3-4) No subtype-specific dedicated trial identified here; may be captured in basket/brain tumor molecular trials
FGFR1 Hotspot mutation (N546K, K656E), mutation/duplication/fusion spectrum >75% in DNET overall FGFR1-altered spectrum; only ~1.18% in ganglioglioma; in driver-unknown LGG/MNGT, FGFR1 N546/K656 mutations in 12% (13/108) (crainic2023rareneuronalglial pages 6-8, engelhardt2022frequentfgfr1hotspot pages 1-2, pereira2026molecularfeaturesin pages 1-2) DNET, RGNT, some mixed neuronal-glial tumors, pilocytic-spectrum tumors FGFR inhibitors (investigational; modest activity so far); molecular testing recommended when targeted options sought (capper2023eanoguidelineon pages 2-3, capper2023eanoguidelineon pages 11-12) ESCAT IIB for FGFR alterations in glioneuronal tumors such as RGNT/DNET per EANO (capper2023eanoguidelineon pages 11-12) NCT05267106 (pemigatinib in FGFR1-3 altered primary CNS tumors; terminated)
NTRK1/2/3 Gene fusions Rare; OpenTargets supports NTRK3 association with mixed neuronal-glial tumor/ganglioglioma (OpenTargets Search: mixed neuronal-glial tumor,ganglioglioma,glioneuronal tumor) Rare glioneuronal tumors, mixed neuronal-glial tumors, ganglioglioma subset Larotrectinib, entrectinib for fusion-positive recurrent disease, ideally in trials/registries (capper2023eanoguidelineon pages 2-3, capper2023eanoguidelineon pages 6-7, capper2023eanoguidelineon pages 11-12) ESCAT IIB; EANO recommends testing in patients who exhausted standard therapy and are fit for targeted treatment (capper2023eanoguidelineon pages 2-3, capper2023eanoguidelineon pages 3-4, capper2023eanoguidelineon pages 11-12) No mixed neuronal-glial subtype-specific NCT identified here; typically basket trial enrollment
PRKCA Fusion (especially SLC44A1::PRKCA) Characteristic / recurrent driver rather than population-frequency estimate provided (crainic2023rareneuronalglial pages 4-5, crainic2023rareneuronalglial pages 5-6, vaz2022uncommonglioneuronaltumors pages 4-6) Papillary glioneuronal tumor (PGNT) No established approved matched therapy in current EANO guidance; primarily diagnostic biomarker Not assigned as an actionable standard target in cited EANO therapeutic recommendations; clinical benefit not established (capper2023eanoguidelineon pages 2-3) No specific trial identified here
PDGFRA p.K385 mutation Defining recurrent alteration for myxoid glioneuronal tumor (MGT) (capper2023eanoguidelineon pages 11-12, xie2023lowgradeepilepsyassociatedneuroepithelial pages 2-3, bale2022the2021who pages 8-9) Myxoid glioneuronal tumor Currently mainly diagnostic; no standard targeted therapy established in cited guidance Used as a diagnostic marker in EANO/WHO-era classification rather than validated therapeutic target (capper2023eanoguidelineon pages 11-12, bale2022the2021who pages 8-9) No specific trial identified here
H3-3A (H3F3A) Histone H3 alterations (e.g., H3 K27M in rare cases) Rare in ganglioglioma (~0.74% in one systematic review context); OpenTargets association present (pereira2026molecularfeaturesin pages 2-4, OpenTargets Search: mixed neuronal-glial tumor,ganglioglioma,glioneuronal tumor) Rare ganglioglioma/anaplastic ganglioglioma and mixed neuronal-glial tumors No established targeted therapy in current glioneuronal standard care; investigational approaches only Not a proven predictive target for routine targeted treatment in current EANO update (bent2025updatedeanoguideline pages 1-2) No specific trial identified here
PTEN Loss / pathway alteration OpenTargets association present but no direct evidence count in cited dataset; may contribute to BRAFi resistance biology (OpenTargets Search: mixed neuronal-glial tumor,ganglioglioma,glioneuronal tumor, pereira2026molecularfeaturesin pages 4-5) Mixed neuronal-glial tumor, resistant BRAF-mutant glioneuronal tumors No established matched therapy in this disease context; relevant to resistance and PI3K/AKT/mTOR biology Not validated as routine actionable target in current EANO guidance for glioneuronal tumors (bent2025updatedeanoguideline pages 1-2) No specific trial identified here
NF1 / KRAS / PTPN11 / other RAS-MAPK genes Somatic mutation / CNV gain / pathway activation Defined adverse-outcome subgroup in ganglioglioma; exact subgroup small (8 PTPN11-altered GG in one series) (kobow2021moleculardiagnosticsin pages 2-4, pereira2026molecularfeaturesin pages 8-9, engelhardt2022frequentfgfr1hotspot pages 1-2) Ganglioglioma with atypical histology/adverse seizure outcome; RGNT may carry NF1 co-alterations No established approved subtype-specific therapy; MAPK-pathway inhibitors considered biologically relevant/investigational (pereira2026molecularfeaturesin pages 8-9, crainic2023rareneuronalglial pages 6-8) Not established as standard actionable targets; testing may be considered when trials/advanced molecular profiling are pursued (capper2023eanoguidelineon pages 2-3, capper2023eanoguidelineon pages 9-10) NCT04923126 (mirdametinib in low-grade glioma; includes MAPK-pathway disease context)
PIK3CA / PIK3R1 Co-mutations / PI3K pathway activation Reported as co-alterations in RGNT and some glioneuronal tumors; no robust prevalence estimate here (crainic2023rareneuronalglial pages 4-5, vaz2022uncommonglioneuronaltumors pages 6-7) Rosette-forming glioneuronal tumor, some mixed neuronal-glial tumors No established approved targeted therapy in this indication; pathway relevance mainly mechanistic Not established as routine actionable target in current EANO recommendations for glioneuronal tumors (capper2023eanoguidelineon pages 2-3, bent2025updatedeanoguideline pages 1-2) No specific trial identified here
ETV6 Fusion partner in NTRK3-related events / association in OpenTargets Rare; OpenTargets association only in current evidence set (OpenTargets Search: mixed neuronal-glial tumor,ganglioglioma,glioneuronal tumor) Rare mixed neuronal-glial tumors / ganglioglioma-related fusion-positive cases If part of ETV6::NTRK3, therapy would follow NTRK inhibitor pathway (larotrectinib/entrectinib) Follows NTRK fusion actionability rather than ETV6 alone (capper2023eanoguidelineon pages 2-3, capper2023eanoguidelineon pages 11-12) Basket trial/registry approach; no specific subtype trial identified here
IDH1 Mutation Rare / generally not characteristic; OpenTargets association exists but classic glioneuronal tumors are usually IDH-wildtype (OpenTargets Search: mixed neuronal-glial tumor,ganglioglioma,glioneuronal tumor, pereira2026molecularfeaturesin pages 2-4, crainic2023rareneuronalglial pages 6-8) Rare atypical ganglioglioma or misclassified tumors No established role in routine therapy for classic mixed neuronal-glial tumors More relevant to differential diagnosis than to standard targeted treatment in this entity group (bent2025updatedeanoguideline pages 1-2) No specific trial identified here
MUTYH Association only in OpenTargets No supporting evidence count in cited OpenTargets dataset (OpenTargets Search: mixed neuronal-glial tumor,ganglioglioma,glioneuronal tumor) Mixed neuronal-glial tumor None established No therapeutic actionability established None identified

Table: This table summarizes the main molecular alterations linked to mixed neuronal-glial tumors and maps them to current or emerging targeted treatment options. It emphasizes where evidence is strongest—especially for BRAF V600E—and where alterations are primarily diagnostic rather than therapeutically validated.

BRAF V600E-targeted therapy: The EANO guideline (2023) recommends that BRAF p.V600E targeted treatment should be considered part of the standard of care for patients with recurrent gliomas, pending regulatory approval (capper2023eanoguidelineon pages 2-3). FDA-approved BRAF inhibitors include vemurafenib (Zelboraf), dabrafenib (Tafinlar), and encorafenib (Braftovi) (pereira2026molecularfeaturesin pages 4-5). Combination BRAF/MEK inhibitor therapy (e.g., dabrafenib + trametinib) is preferred as it can overcome resistance to single-agent BRAF inhibitors and has been shown to produce durable responses (crainic2023rareneuronalglial pages 18-19, capper2023eanoguidelineon pages 9-10). In a multi-institutional study of BRAF-mutant pediatric high-grade gliomas (including anaplastic gangliogliomas) treated with upfront molecular targeted therapy, 3-year progression-free and overall survival were 65% and 82%, respectively, superior to historical controls (rosenberg2022upfrontmoleculartargeted pages 5-6).

NTRK inhibitors: Larotrectinib and entrectinib have received conditional tumor-agnostic approval for NTRK fusion-positive tumors (capper2023eanoguidelineon pages 6-7). However, evidence of clinical benefit specifically in adult CNS tumors remains limited, and treatment should preferably occur within clinical trials (capper2023eanoguidelineon pages 2-3, capper2023eanoguidelineon pages 11-12).

FGFR inhibitors: Clinical trials have evaluated FGFR inhibitors (e.g., pemigatinib, NCT05267106) for FGFR-altered CNS tumors, though activity has been modest (capper2023eanoguidelineon pages 2-3, capper2023eanoguidelineon pages 11-12). FGFR alterations are classified as ESCAT IIB in glioneuronal tumors (capper2023eanoguidelineon pages 11-12).

Radiotherapy (MAXO:0000015 - radiation therapy)

Radiotherapy is reserved for subtotal resection of aggressive tumors, tumors in eloquent brain areas, or recurrent disease (crainic2023rareneuronalglial pages 6-8, talloa2022brafandmek pages 10-11). Focal radiation therapy should be used cautiously in young children due to long-term cognitive side effects (talloa2022brafandmek pages 10-11).

Chemotherapy

Temozolomide has limited evidence for improving survival but may be considered for anaplastic features or inoperable recurrent tumors (crainic2023rareneuronalglial pages 6-8). For DLGNT, bevacizumab has been used successfully in some cases (crainic2023rareneuronalglial pages 18-19).

Clinical Trials

  • NCT02684058: Dabrafenib + trametinib in pediatric BRAF V600 mutation-positive LGG/relapsed HGG (Phase 2, completed, 151 participants)
  • NCT04923126: Mirdametinib (MEK inhibitor) in children/adolescents/young adults with low-grade glioma (Phase 1/2, recruiting, 132 participants)
  • NCT05267106: Pemigatinib (FGFR inhibitor) in FGFR1-3 altered primary CNS tumors (Phase 2, terminated, 83 participants)
  • NCT05259605: EORTC observational study assessing treatment and outcome using WHO 2021 classification (recruiting, 1650 participants)

13. Prevention

Primary Prevention

No established primary prevention strategies exist for mixed neuronal-glial tumors. As these tumors arise from somatic mutations during neural development, there are no modifiable risk factors or vaccination strategies available.

Secondary Prevention (Early Detection)

  • Early neuroimaging (MRI) evaluation in children presenting with new-onset seizures
  • Genetic counseling for families with NF1 or other cancer predisposition syndromes
  • Epilepsy monitoring and evaluation for surgical candidacy in drug-resistant cases

Tertiary Prevention

  • Post-surgical surveillance imaging to monitor for recurrence
  • Long-term epilepsy follow-up and anti-seizure medication management
  • Neurocognitive monitoring and rehabilitation, particularly in pediatric patients

14. Other Species / Natural Disease

Limited data exist on naturally occurring mixed neuronal-glial tumors in other species. Ganglioglioma-like tumors have been rarely reported in veterinary neuropathology in domestic animals. BRAF V600E-equivalent mutations and MAPK pathway alterations have been identified in canine tumors, supporting evolutionary conservation of oncogenic mechanisms. However, no systematic comparative pathology data specific to glioneuronal tumors are available in the current literature.


15. Model Organisms

Genetic Models

Experimental models have demonstrated that expression of BRAF V600E in neural progenitors during embryonic development reproduces ganglioglioma histopathological features and leads to epileptic seizures (kobow2021moleculardiagnosticsin pages 2-4). These models have been crucial for understanding the developmental origin of these tumors and the mechanism of epileptogenicity.

  • Mouse models: Conditional BRAF V600E expression in neural progenitors (genetically engineered mouse models)
  • Cell lines: Patient-derived primary tumor cultures have been used for drug sensitivity studies

Model Limitations

  • Difficulty recapitulating the mixed neuronal-glial phenotype in full
  • Limited availability of immortalized cell lines due to the low-grade, slow-growing nature of most subtypes
  • Differences between murine and human neural development may affect translational relevance

Summary

Mixed neuronal-glial tumors are a diverse group of rare, predominantly low-grade CNS neoplasms characterized by dual neuronal-glial composition, strong association with epilepsy, and frequent MAPK pathway alterations. The WHO 2021 classification substantially expanded and refined this tumor family through integration of molecular markers and DNA methylation profiling. BRAF V600E is the most actionable therapeutic target, with dabrafenib/trametinib combination therapy approaching standard-of-care status for recurrent disease per EANO guidelines. Gross total surgical resection remains the primary curative modality, with excellent long-term survival exceeding 80% for WHO grade 1 subtypes. Ongoing molecular characterization continues to identify new tumor entities and refine prognostic stratification within this heterogeneous tumor group.

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