JOURNAL ARTICLE

Histone H3 K27M mutations in adult cerebellar high-grade gliomas

Satoshi Nakata, Sumihito Nobusawa, Tatsuya Yamazaki, Tadashi Osawa, Keishi Horiguchi, Yasuhiro Hashiba, Hiroyuki Yaoita, Nozomi Matsumura, Hayato Ikota, Junko Hirato, Yuhei Yoshimoto, Hideaki Yokoo
Brain Tumor Pathology 2017, 34 (3): 113-119
28547652
Adult cerebellar high-grade gliomas (HGG) are rare and their molecular basis has not been fully elucidated. Although a diffuse midline glioma H3 K27M-mutant, a recently characterized variant of HGG, was reported to occasionally occur in the cerebellum, adult cases were rarely tested for this mutation; only five mutant cases have been reported to date. It currently remains unknown whether H3 K27M-mutant cerebellar gliomas share common histological features or have a uniformly dismal prognosis. In the present study, we assessed the prevalence of histone H3 K27M mutations in ten adult cerebellar HGG, identifying two H3F3A-mutant cases. One case was a 70-year-old female with a cystic lesion. Histologically, the tumor was considered to be glioblastoma; however, a part of the tumor exhibiting low proliferative activity appeared to be consistent with long-standing H3 K27M-mutant tumors in the literature. Another case was a 69-year-old male. The tumor showed a distinct circumscribed histology with minimal astrocytic differentiation, suggesting a nosological issue in the diagnosis of diffuse midline glioma. More cerebellar tumors need to be tested for H3 K27M mutations to clarify the clinical and histopathological spectra of this tumor.

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