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- W2164986212 abstract "Glioblastoma multiforme (GBM) contains a population of cells that exhibit stem cell phenotypes. These cancer stem cells (CSCs) may be a source of therapeutic resistance, although support for this important concept is limited.We determined whether early-passage GBM CSCs respond differently than patient-matched, genotypically similar non-CSCs to clinically relevant single or serial doses of temozolomide (TMZ), radiation therapy (XRT), or alternating TMZ treatment and XRT, which is the standard of care for GBM patients.Despite the phenotypic differences, including the presence of stem cell markers and formation of intracranial tumors, the CSCs and matched non-CSCs were equally resistant to TMZ in a majority of patients, using 2 independent assays. TMZ response was consistent with methylated O(6)-DNA methylguanine-methyltransferase (MGMT) and MGMT protein levels in both culture types. In contrast, CSCs were unexpectedly more responsive to XRT compared with matched non-CSCs from 2 patients despite having relatively equal resistance to TMZ. However, for the majority of culture pairs from individual patients, responses in CSCs were indistinguishable from non-CSC cultures.In our patient-matched primary cultures, response to TMZ was tightly linked to the individual tumor's MGMT status and independent of their phenotypic differences. TMZ and XRT together revealed no additive benefit compared with monotherapy for either culture type, in contrast to the notion that the CSC population is more resistant to XRT. If the tumor cell response in vitro mirrors therapeutic response in larger patient cohorts, these rapid assays in primary cultures could allow -empirical selection of efficacious therapeutic agents on a patient-specific basis." @default.
- W2164986212 created "2016-06-24" @default.
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- W2164986212 date "2013-12-04" @default.
- W2164986212 modified "2023-10-15" @default.
- W2164986212 title "Response of primary glioblastoma cells to therapy is patient specific and independent of cancer stem cell phenotype" @default.
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- W2164986212 doi "https://doi.org/10.1093/neuonc/not223" @default.
- W2164986212 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3922516" @default.
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