Types & Subtypes
Oligodendroglioma, IDH-mutant and 1p/19q-codeleted (grade 3)
A grade 3 oligodendroglioma is a more aggressive form of oligodendroglioma, still with a relatively favorable outlook and good response to chemotherapy.
In short: Oligodendroglioma, IDH-mutant and 1p/19q-codeleted (grade 3)
- It is the higher grade of oligodendroglioma.
- It shows more aggressive features than grade 2.
- It is still IDH-mutant and 1p/19q-codeleted.
- It retains a relatively favorable outlook and chemotherapy response.
What it is
An oligodendroglioma, IDH-mutant and 1p/19q-codeleted, CNS WHO grade 3 is the higher grade of oligodendroglioma, showing more aggressive features (such as increased cell division) than a grade 2 tumor. It was formerly called "anaplastic oligodendroglioma." It retains a relatively favorable outlook and good response to chemotherapy.
Understanding Oligodendroglioma, IDH-mutant and 1p/19q-codeleted (grade 3)
Although more aggressive than grade 2, this tumor still carries the favorable defining features (IDH mutation and 1p/19q codeletion), which are associated with a good response to treatment — particularly chemotherapy. Treatment typically combines surgery with radiation and chemotherapy (such as PCV), and the combination of radiation plus PCV chemotherapy has been shown to meaningfully extend survival in these tumors. Despite the higher grade, the outlook remains relatively favorable compared with IDH-wildtype high-grade gliomas, reflecting how strongly the molecular features influence behavior. The approach is individualized. Understanding the grade 3 oligodendroglioma clarifies a more aggressive but still favorable oligodendroglioma and its responsive nature.
Why it matters
Understanding the grade 3 oligodendroglioma helps patients and families see a more aggressive tumor that still carries favorable molecular features — with a relatively good outlook and strong response to chemotherapy.
Common questions
What is a grade 3 oligodendroglioma?
The higher grade of oligodendroglioma, with more aggressive features.
What was it formerly called?
Anaplastic oligodendroglioma.
Does it respond to chemotherapy?
Yes — it retains a good response, and radiation plus PCV extends survival.
Bottom line
A grade 3 oligodendroglioma is a more aggressive oligodendroglioma that retains a relatively favorable outlook and strong response to chemotherapy.
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