Ak Aksoy, SeçilMutlu, MelisTunca, BerrinKocaeli, HasanTaşkapılıoğlu, Mevlüt ÖzgürBekar, AhmetTekin, ÇağlaArğadal, Ömer GökayCivan, Muhammet NafiKaya, İsmail SeçkinOcak, Pınar EserTolunay, Şahsine2024-06-262024-06-262021-06-210161-6412https://doi.org/10.1080/01616412.2021.1948738https://www.tandfonline.com/doi/full/10.1080/01616412.2021.1948738https://hdl.handle.net/11452/42463Objective: This study was designed to conduct molecular classification based on IDH1/2, TERT, ATRX, and DAXX changes in pediatric and adult primary glioblastoma (GB) and to analyze the potential interaction of LncRNA MALAT1 in the determined homogeneous subgroups. Methods: We analyzed the expression profiles of ATRX/DAXX and MALAT1 using the qRT-PCR method and IDH and TERT mutation status using DNA sequencing analysis in 85 primary pediatric and adult GB patients. Results: IDH1 mutation was observed in 5 (5.88%) and TERT mutation in 65 (76.47%) primary pediatric and adult GB patients. ATRX and DAXX were detected in 18 (21.18%) and 7 (8.24%) patients. TERT mutation and loss of ATRX/DAXX were associated with short overall survival (p < 0.001, p < 0.001, respectively). Patients carrying especially TERT C228T mutation had worse prognosis (p < 0.001). Six subgroups were obtained from the genetic analysis. Among the subgroups, MALAT1 was highly expressed in group A that had a single TERT mutation as compared to that in groups D and E (p = 0.001 and p < 0.001, respectively); further, high MALAT1 expression was associated with worse prognosis in patients with C228T mutation (p < 0.001). Conclusions: Our findings highlight that the presence of TERT C228T mutation and expression of MALAT1 can be used as primary targets during the follow-up of primary GB patients and in the development of new treatment strategies.eninfo:eu-repo/semantics/closedAccessLong noncoding RNAPediatric glioblastomaTumorsTemozolomideGliomaCellsAtrxGlioblastomaIDH12TertMALAT1PrognosisNeurosciences & neurologyArticle000669136900001916925431110.1080/01616412.2021.19487381743-1328