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Genetic and epigenetic stability of oligodendrogliomas at recurrence

Overview of attention for article published in Acta Neuropathologica Communications, March 2017
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Title
Genetic and epigenetic stability of oligodendrogliomas at recurrence
Published in
Acta Neuropathologica Communications, March 2017
DOI 10.1186/s40478-017-0422-z
Pubmed ID
Authors

Koki Aihara, Akitake Mukasa, Genta Nagae, Masashi Nomura, Shogo Yamamoto, Hiroki Ueda, Kenji Tatsuno, Junji Shibahara, Miwako Takahashi, Toshimitsu Momose, Shota Tanaka, Shunsaku Takayanagi, Shunsuke Yanagisawa, Takahide Nejo, Satoshi Takahashi, Mayu Omata, Ryohei Otani, Kuniaki Saito, Yoshitaka Narita, Motoo Nagane, Ryo Nishikawa, Keisuke Ueki, Hiroyuki Aburatani, Nobuhito Saito

Abstract

Among diffuse gliomas, oligodendrogliomas show relatively better prognosis, respond well to radiotherapy and chemotherapy, and seldom progress to very aggressive tumors. To elucidate the genetic and epigenetic background for such behavior and tumor evolution during tumor relapse, we comparatively analyzed 12 pairs of primary and recurrent oligodendrogliomas with 1p/19q-codeletion. Initial treatment for these patients was mostly chemotherapy alone. Temozolomide was used for 3, and procarbazine, nimustine and vincristine (PAV chemotherapy) were used for 7 patients. World Health Organization histological grade at recurrence was mostly stable; it was increased in 2, the same in 9, and decreased in 1 cases. Whole-exome sequencing demonstrated that the rate of shared mutation between the primary and recurrent tumors was relatively low, ranging from 3.2-57.9% (average, 33.3%), indicating a branched evolutionary pattern. The trunk alterations that existed throughout the course were restricted to IDH1 mutation, 1p/19q-codeletion, and TERT promoter mutation, and mutation of the known candidate tumor suppressor genes CIC and FUBP1 were not consistently observed between primary and recurrent tumors. Multiple sampling from different regions within a tumor showed marked intratumoral heterogeneity. Notably, in general, the number of mutations was not significantly different after recurrence, remaining under 100, and no hypermutator phenotype was observed. FUBP1 mutation, loss of chr. 9p21, and TCF12 mutation were among a few recurrent de novo alterations that were found at recurrence, indicating that these events were clonally selected at recurrence but were not enough to enhance malignancy. Genome-wide methylation status, measured by Illumina 450 K arrays, was stable between recurrence and the primary tumor. In summary, although oligodendroglioma displays marked mutational heterogeneity, histological malignant transformation accompanying events such as considerable increase in mutation number and epigenetic profile change were not observed at recurrence, indicating that noticeable temporal and spatial genetic heterogeneity in oligodendrogliomas does not result in rapid tumor progression.

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Mendeley readers

The data shown below were compiled from readership statistics for 48 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 48 100%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 8 17%
Researcher 7 15%
Student > Doctoral Student 5 10%
Student > Master 5 10%
Other 5 10%
Other 6 13%
Unknown 12 25%
Readers by discipline Count As %
Medicine and Dentistry 14 29%
Biochemistry, Genetics and Molecular Biology 10 21%
Neuroscience 5 10%
Agricultural and Biological Sciences 2 4%
Immunology and Microbiology 1 2%
Other 2 4%
Unknown 14 29%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 27 October 2017.
All research outputs
#10,694,107
of 12,059,719 outputs
Outputs from Acta Neuropathologica Communications
#483
of 522 outputs
Outputs of similar age
#238,895
of 284,827 outputs
Outputs of similar age from Acta Neuropathologica Communications
#41
of 45 outputs
Altmetric has tracked 12,059,719 research outputs across all sources so far. This one is in the 1st percentile – i.e., 1% of other outputs scored the same or lower than it.
So far Altmetric has tracked 522 research outputs from this source. They typically receive more attention than average, with a mean Attention Score of 7.7. This one is in the 1st percentile – i.e., 1% of its peers scored the same or lower than it.
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We're also able to compare this research output to 45 others from the same source and published within six weeks on either side of this one. This one is in the 1st percentile – i.e., 1% of its contemporaries scored the same or lower than it.