Brain Network Connectivity Predicts Survival in Diffuse Midline Glioma

Diffuse intrinsic pontine glioma (DIPG) and other diffuse midline gliomas (DMG) are aggressive pediatric brain tumors characterized by extensive infiltration and resistance to therapy. While a growing number of studies have provided evidence in preclinical models that functional integration of DMG into non-malignant neural circuits influences tumor progression, the clinical implications of such connectivity remain unclear. In a recent study, Sidpra, Lind, and colleagues developed tumor network mapping to define the spatial topography of brain network connections in DMG, integrating MRI data with clinical outcomes in a discovery cohort of 125 pediatric patients with primary pontine DMG/DIPG or thalamic DMG. While tumor location mapping demonstrated that the specific location of a tumor within a region of the pons or within a region of the thalamus was not associated with overall survival, tumor network mapping revealed that functional connectivity between tumors and specific brain regions was significantly associated with shorter overall survival. Across discovery and independent validation cohorts, the degree of functional connectivity indeed predicted patient survival, and analyses of paired diagnostic and follow-up imaging acquired within two months of death demonstrated that tumor growth preferentially followed trajectories toward highly connected network nodes. Notably, the neurometabolic development of brain circuits seemed to be associated with tumor incidence, as brain regions displaying peaks in neurometabolic remodeling over time coincided with brain regions within the DMG network. Single-nucleus RNA sequencing analysis further showed that highly connected tumors were enriched for pathways involved in neuron-to-glioma synapses. In a retrospective cohort of 23 children with thalamic DMG who underwent subtotal tumor resections, the removal of highly connected tumor regions was associated with significantly longer survival than resection of less connected regions, independent of resection volume. Together, these findings define a prognostically important human brain network in DMG and provide clinical evidence that tumor interactions with distributed neural circuits contribute to disease progression and represent a potential target for therapeutic intervention.Sidpra J, Lind V, Cohen AL, Schaper FLWVJ, Stone TJ, Grabovska Y, et al. A prognostic human brain network for diffuse midline glioma. Nature 2026 Jun 10 [Epub ahead of print].Note: Research Watch is written by Cancer Discovery editorial staff. Readers are encouraged to consult the original articles for full details. For more Research Watch, visit Cancer Discovery online at https://aacrjournals.org/cdnews.