What does this research mean for the field?

In glioblastoma, cell-free DNA release and composition are dynamically driven by tumor proliferation, microenvironmental interactions, and therapeutic stress, rather than being solely dependent on cell death. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To characterize how tumor proliferation, microenvironmental interactions, and therapeutic stress regulate cell-free DNA (cfDNA) release dynamics, fragmentation, and genetic composition in glioblastoma.

September 3, 2026Neuro-OncologyOpen Access

Cell-Free DNA Sequencing Captures Tumor Dynamics, Microenvironment Interactions, and Treatment Pressures in Glioblastoma

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Authors

SMSharvari MankameTranslational Genomics Research Institute ABAngad BeniwalMayo Clinic in Arizona MDMatthew DufaultMayo Clinic Hospital

Discussion

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Implication

Preclinical study reveals cell-free DNA release dynamics in glioblastoma models, indicating how tumor growth and chemotherapy alter liquid biopsy profiles.

Key Points

To characterize how tumor proliferation, microenvironmental interactions, and therapeutic stress regulate cell-free DNA (cfDNA) release dynamics, fragmentation, and genetic composition in glioblastoma.
Analyzed cfDNA yield, fragmentation profiles, variant allele frequencies, and copy number alterations over time in patient-derived glioblastoma monocultures.
Profiled cfDNA composition in competitive co-cultures combining glioblastoma cells with normal human astrocytes and under temozolomide chemotherapy exposure.
Evaluated and deconvolved tumor-specific cfDNA from plasma in orthotopic glioblastoma mouse xenograft models.
In monoculture, increases in cfDNA yield correlated more strongly with viable cell counts than with apoptotic cell death.
Temozolomide exposure shifted the dominant cfDNA origin toward cell-death pathways, yielding higher overall cfDNA, distinct nucleosomal fragmentation, and reduced variant diversity.
Co-culture and xenograft plasma assays successfully deconvolved tumor-specific from host-derived cfDNA, capturing competitive astrocyte loss and recapitulating parental copy number profiles.

Cite This Study

Mankame et al. (2026) studied this question.

synapsesocial.com/papers/6a99355b636c6408cfa7d7fc https://doi.org/10.1093/neuonc/noag204

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Implication

Preclinical study reveals cell-free DNA release dynamics in glioblastoma models, indicating how tumor growth and chemotherapy alter liquid biopsy profiles.

Cell-Free DNA Sequencing Captures Tumor Dynamics, Microenvironment Interactions, and Treatment Pressures in Glioblastoma

Discussion

Member takes

Implication

Key Points

Cite This Study

Cell-Free DNA Sequencing Captures Tumor Dynamics, Microenvironment Interactions, and Treatment Pressures in Glioblastoma

Discussion

Member takes

Implication

Key Points

Cite This Study

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