Your Visual Guide Glioma

Understanding gliomas through data, infographics, and evidence-based insights from the WHO 2021 Classification and current epidemiological research.

WHO 2021 aligned Plain-language explanations Made for patients, caregivers, and clinicians
Epidemiology
~25,000-28,000
Estimated glioma cases per year in the United States.
Classification
WHO 2021
Modern glioma diagnosis now starts with molecular features like IDH status, not just what the tumor looks like under the microscope.
Treatment Model
Team-based care
Most treatment plans combine surgery, radiation, systemic therapy, and ongoing supportive care from multiple specialists.
Role Lens
Start Here Based on What You Need
The same diagnosis page should not read the same way to everyone. These starting points make the guide useful whether you are living with glioma, supporting someone, or helping manage care professionally.
Patient

Understand what happens next

Start with diagnosis, biomarkers, and treatment options so the next appointment feels less opaque.

Caregiver

Prepare for coordination and decisions

Focus on the care team, symptoms, and support systems so you know who does what and when to ask for help.

Supporter

Learn the language and where to help

Get a fast understanding of glioma, what treatment involves, and what practical or emotional support usually matters most.

Healthcare Professional

Get a sharp taxonomy and care snapshot

Use this page as a compact refresher on classification, biomarkers, multidisciplinary care structure, and the live glioma intelligence feed.

Understanding Glioma
What Is a Glioma & How Is It Classified?
Gliomas are tumors that arise from glial cells — the supportive cells of the brain (astrocytes and oligodendrocytes). The WHO 2021 update shifted classification from histology to molecular markers. Diagnosis now starts with IDH mutation status.
Adult Diffuse Glioma
IDH Mutation Status?
IDH-Mutant
1p/19q Codeletion?
Codeleted
Oligodendroglioma
IDH-mutant & 1p/19q-codeleted
Grade 2 Grade 3 IDH1/2 1p/19q
Intact
Astrocytoma
IDH-mutant
Grade 2 Grade 3 Grade 4 ATRX loss TP53
IDH-Wildtype
Glioblastoma
IDH-wildtype
Grade 4 TERT +7/−10 EGFR amp
Tumor Grading
WHO Tumor Grades 1–4
Tumor grade reflects how abnormal the cells look and how fast the tumor grows. Higher grade = faster growth.
Grade 1 — Slow Grade 4 — Aggressive
1
Low Grade
Slow-growing, well-defined borders. Often curable with surgery alone.
2
Low Grade
Slow but infiltrative. May recur and progress to higher grade over time.
3
High Grade
Actively growing with abnormal cells. Requires multimodal treatment.
4
High Grade
Most aggressive. Rapid growth, necrosis, new blood vessel formation.
Molecular Markers
The Key Biomarkers in Glioma
Modern glioma classification depends on specific molecular markers. Each reveals something different about your tumor.
Diagnostic
IDH1/2
Isocitrate Dehydrogenase 1 & 2
The single most important test. Divides all diffuse gliomas into IDH-mutant (more favorable outcomes) vs IDH-wildtype (GBM).
~80% of grade 2-3 gliomas
Diagnostic
1p/19q
Chromosome 1p/19q Codeletion
Defines oligodendroglioma when found with IDH mutation. Patients with codeletion have significantly longer survival.
~15-20% of diffuse gliomas
Diagnostic
ATRX
Alpha-Thalassemia/MR X-linked
Loss of ATRX is associated with astrocytic lineage. Mutually exclusive with 1p/19q codeletion.
~70% of IDH-mutant astrocytomas
Prognostic
CDKN2A/B
Cyclin-Dependent Kinase Inhibitor 2A/B
Homozygous deletion upgrades IDH-mutant astrocytoma to grade 4, even without necrosis or vascular proliferation.
Key grading criterion
Predictive
MGMT
O6-Methylguanine-DNA Methyltransferase
Promoter methylation predicts better response to temozolomide (TMZ) chemotherapy in specific tumor types.
~30-40% of GBM
Prognostic
TP53
Tumor Protein 53
Frequently mutated in IDH-mutant astrocytomas. Co-occurs with ATRX loss, helps confirm astrocytic lineage.
~60% of IDH-mutant astrocytomas
Signs & Symptoms
Common Glioma Symptoms
Symptoms depend on the tumor's location, size, and growth rate. Many symptoms result from increased pressure inside the skull.
Headaches
Seizures
Speech Difficulties
Weakness/Numbness
Mental Function Changes
Nausea/Vomiting
Headaches
Seizures
Speech Difficulties
Weakness / Numbness
Mental Function Changes
Nausea / Vomiting
Diagnosis
The Diagnostic Journey
From first scan to treatment plan — the typical path to a glioma diagnosis.
1

Brain Scan

MRI with contrast reveals tumor location, size, and characteristics

2

Resection / Biopsy

Surgical removal or tissue sample for pathological examination

3

Molecular Testing

IDH, 1p/19q, ATRX, MGMT and other biomarker analysis

4

Integrated Diagnosis

WHO 2021 classification combining histology with molecular data

5

Treatment Plan

Personalized plan based on tumor type, grade, and molecular profile

Treatment
Treatment Options for Glioma
Treatment depends on tumor type, grade, location, and your overall health. Most plans combine multiple approaches.

Surgery

Resection to reduce tumor mass, relieve pressure, and obtain tissue for diagnosis

Radiation Therapy

Targeted high-energy beams to destroy remaining cancer cells after surgery

Chemotherapy / TMZ

Temozolomide (oral) or other medications to attack cancer cells throughout the brain

Targeted Therapy

Drugs designed for specific molecular targets like IDH inhibitors (vorasidenib)

Clinical Trials

Access cutting-edge experimental treatments and therapies

Browse clinical trials →

Watch & Wait

Active observation with regular MRI scans for low-grade tumors not yet requiring treatment

Care Team
Your Multidisciplinary Care Team
Glioma treatment involves a team of specialists working together to provide the best possible care.
Core Specialists

The people driving diagnosis and treatment

These specialists determine what the tumor is, what the immediate treatment path looks like, and how the next phase of care is sequenced.
Core specialist

Neurosurgeon

Performs brain surgery for tumor removal or biopsy

Best for: resection strategy, biopsy decisions, and surgery-related risk questions
Core specialist

Neuro-oncologist

Brain tumor specialist who leads treatment planning

Best for: integrating pathology, imaging, medications, and clinical trial options into one plan
Core specialist

Medical Oncologist

Manages chemotherapy and systemic drug treatments

Best for: temozolomide, systemic therapy decisions, side effects, and treatment tolerance
Core specialist

Radiation Oncologist

Plans and delivers precision radiation therapy

Best for: dose planning, expected side effects, and how radiation fits around surgery or chemotherapy
Support Team

The people protecting day-to-day quality of life

These roles matter because glioma care is not only about tumor control. Symptom management, logistics, function, and emotional resilience all affect outcomes.
Support role

Neuro-oncology Nurse

Day-to-day care coordination and symptom management

Best for: new symptoms, medication questions, steroids, seizure concerns, and urgent care coordination
Support role

Nurse Navigator

Guides you through appointments, insurance, and logistics

Best for: referrals, scheduling, outside records, insurance friction, and getting the right people in the room
Support role

OT / PT Therapist

Occupational and physical therapy for functional recovery

Best for: mobility, balance, fatigue, cognitive support, and getting back to daily function safely
Support role

Mental Health

Psychological support for patients and caregivers

Best for: coping with uncertainty, caregiver strain, adjustment after diagnosis, and keeping support consistent over time
Resources
Support Organizations
You are not alone. These organizations provide information, community, and support for brain tumor patients and caregivers.
General support

American Brain Tumor Association

Comprehensive brain tumor information, patient support programs, and research funding.

Visit ABTA →
Navigation

Brain Tumor Network

Free mentoring, second opinions support, and personalized assistance for brain tumor patients.

Visit BTN →
Advocacy

End Brain Cancer Initiative

Research advocacy and patient resources focused on accelerating brain cancer cures.

Visit EBCI →
Research + policy

National Brain Tumor Society

Leading nonprofit investing in research, advocacy, and patient services for brain tumors.

Visit NBTS →
Subtype community

Oligo Nation

Community and resources specifically for oligodendroglioma patients and families.

Visit Oligo Nation →
Emotional support

CancerCare

Free professional support services including counseling, support groups, and financial assistance.

Visit CancerCare →
Practical help

Triage Cancer

Free legal and practical resources on insurance, employment, and finances during treatment.

Visit Triage Cancer →
Pediatric focus

DIPG Advocacy Group

Dedicated to raising awareness and funding research for Diffuse Intrinsic Pontine Glioma, one of the most challenging pediatric brain tumors.

Visit DIPG Advocacy Group →
Family support

Pediatric Brain Tumor Foundation

Resources, support, and research funding for families affected by childhood brain tumors including pediatric gliomas.

Visit PBTF →

GRAACC (Brazil)

Leading Brazilian pediatric cancer center supporting treatment and research for childhood brain tumors.

Visit GRAACC →