Molecular profiling in glioma classification
Identifying mutations is the key to precisely classifying adult-type diffuse gliomas
- The NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines®) recommend conducting initial IDH testing for the workup of all gliomas, followed by additional molecular characterization1,2
- Adult-type diffuse gliomas, a subtype of glioma, are further categorized into 3 subtypes according to the mutational status of IDH and 1p/19q-codeletion in the 2021 WHO classification2
2021 WHO classification of adult-type diffuse gliomas2
| Adult-type diffuse glioma | Genes and altered molecular profiles | CNS WHO Grade |
|---|---|---|
| Astrocytoma | mutated IDH1 and IDH2 | 2, 3, 4 |
| Oligodendroglioma | mutated IDH1 and IDH2, and 1p/19q-codeleted | 2, 3 |
| Glioblastoma | wild-type IDH | 4 |
amIDH glioma cells include astrocytes and oligodendrocytes that are mutated in adult-type diffuse glioma.
Gliomas with mutated IDH1 and IDH2 have improved prognoses compared to gliomas with wild-type IDH (glioblastoma)3-5
Identifying your patients' IDH mutation may require NGS if IHC is negative1,6
- While IHC can identify the most common IDH1 mutation, R132H, up to 16% of patients with mIDH glioma have an IDH1 or IDH2 mutation that requires NGS to be detected7,8
- VORANIGO has an FDA-approved NGS companion diagnostic that tests for IDH1 and IDH2 mutations6,9
According to the NCCN Guidelines®, if the IHC result for mIDH1-R132H is negative for a patient under age 55, sequencing is required to detect less common IDH1 and IDH2 mutations1
Even following gross total resection (GTR), mIDH gliomas continue to grow
IDH1/2-mutant astrocytomas and oligodendrogliomas grow continuously over time regardless of the extent of resection10,11
The presence of residual tumor cells remains after surgery due to the diffuse and infiltrative nature of mIDH gliomas11,12
mIDH gliomas eventually become aggressive and may lead to premature death10,12
See tumor growth rate data in patients with mIDH glioma treated with VORANIGO vs active observation
1. Changing the mIDH Glioma Landscape
2. An important step forward in the treatment of mIDH glioma with VORANIGO
3. Diving into the data from the INDIGO trial
4. Extended analysis from the INDIGO trial: TGR and seizure data
5. Dosing and safety of VORANIGO
6. A new era in the treatment of Grade 2 mIDH glioma
7. Important Safety Information