The First Days After Diagnosis
Receiving a glioblastoma diagnosis — whether following emergency symptoms or a routine scan — is a life-altering moment. It's normal to feel shock, fear, and uncertainty. The first 30 days will likely move fast, involving multiple specialists, complex decisions, and significant emotional weight. Understanding what typically happens during this period can help patients and families feel more prepared.
Imaging and Pathology: Confirming the Diagnosis
GBM is usually first identified on an MRI with contrast, which typically shows a ring-enhancing lesion with surrounding edema. However, imaging alone cannot confirm a GBM diagnosis — that requires tissue. The diagnostic workup typically includes:
- MRI brain (with and without contrast): To characterize the tumor's size, location, and features
- Surgical resection or biopsy: To obtain tissue for pathological analysis
- Molecular profiling: Testing for IDH mutation, MGMT methylation, EGFR amplification, TERT promoter mutation, and other markers that inform diagnosis and treatment
Since 2021, the WHO Classification of CNS Tumors uses molecular markers — not just histology — to define GBM. An IDH-wildtype grade 4 astrocytoma is the current formal designation for what most people call GBM.
Assembling Your Care Team
GBM care is inherently multidisciplinary. Your core team may include:
- Neurosurgeon: Performs resection or biopsy
- Neuro-oncologist: Manages chemotherapy and overall treatment strategy
- Radiation oncologist: Plans and delivers radiation therapy
- Neuropathologist: Analyzes tumor tissue
- Neuropsychologist: Assesses and supports cognitive function
- Social worker / palliative care team: Addresses quality of life, emotional wellbeing, and care planning
If possible, seek care at a comprehensive cancer center or academic medical center with a dedicated neuro-oncology team. These centers tend to have more experience with GBM, access to molecular testing, and availability of clinical trials.
Practical Steps in the First Month
- Get a second opinion. Even if you trust your initial team, a second pathology review and neuro-oncology consultation can confirm the diagnosis and open doors to additional options. Most insurers cover this.
- Request full molecular pathology results. Ask for your tumor's IDH status, MGMT methylation, and full next-generation sequencing (NGS) panel if available.
- Designate a medical advocate. A trusted family member or friend who can attend appointments, take notes, and help communicate with the care team.
- Understand your insurance coverage. Know your deductibles, in-network providers, and prior authorization requirements before treatment begins.
- Contact patient advocacy organizations. Organizations like ABTA and NBTS offer free resources, navigation support, and connection to others who have been through this.
Managing Steroids and Symptoms
Many patients are placed on corticosteroids (usually dexamethasone) to reduce brain swelling. While helpful short-term, steroids can cause significant side effects including elevated blood sugar, mood changes, weight gain, and increased infection risk. Ask your team about the minimum effective dose and a tapering plan as soon as it is safe.
You Are Allowed to Take Time
While GBM is an aggressive cancer where timely treatment matters, most patients have days — not hours — to gather information, ask questions, and make thoughtful decisions. You do not have to decide anything alone, and seeking information is a sign of strength, not delay.