Glioma progression is shaped by genetic evolution and microenvironment interactions

Area of Science:

• Neuro-oncology
• Cancer Genomics
• Tumor Microenvironment

Background:

• Therapy resistance in diffuse glioma is a significant clinical challenge.
• The cellular and genetic factors driving treatment resistance remain poorly understood.

Purpose of the Study:

• To identify treatment-associated cellular and genetic alterations in recurrent diffuse gliomas.
• To compare recurrence patterns between isocitrate dehydrogenase (IDH)-wild-type and IDH-mutant glioma subtypes.

Main Methods:

• Analysis of RNA and/or DNA sequencing data from paired tumor samples of 304 adult patients.
• Assessment of histological features, somatic alterations, and microenvironment interactions at recurrence.

Main Results:

• Recurrence patterns differed based on IDH mutation status, involving histological changes, genetic alterations, and microenvironment interactions.
• Hypermutation and CDKN2A deletions correlated with increased proliferation in both subtypes.
• IDH-wild-type tumors showed increased invasiveness and neuronal signaling, suggesting a role in progression.
• Mesenchymal transition was linked to myeloid cell interactions with neoplastic cells.

Conclusions:

• Distinct recurrence phenotypes in diffuse glioma are IDH-dependent and involve cellular, genetic, and microenvironmental factors.
• These recurrence-associated phenotypes present potential therapeutic targets for altering disease progression.