Abstract
Rhabdomyosarcoma is the most common soft-tissue sarcoma affecting children and adolescents. It is defined as a malignant neoplasm characterized by morphologic, immunohistochemical, ultrastructural, or molecular genetic evidence of primary skeletal muscle differentiation, usually in the absence of any other pattern of differentiation. Primary intracranial rhabdomyosarcoma (PIRMS) is an extremely rare neoplasm, with only 60 cases reported in the literature, and generally has poor prognosis with an overall survival of only 9.1 months. The DICER1 gene encodes an RNA endoribonuclease that plays a key role in gene expression regulation through the production of small RNAs. Herein, we report two cases of PIRMS with somatic DICER1 mutation showing morphological and immunohistochemical evidence of primary skeletal muscle differentiation; the two cases share common clinical features, including young age, supratentorial tumor, and onset of intratumoral bleeding. Although methylation profiling was not performed, both cases shared clinical and pathological characteristics in common with recently proposed methylation entity “spindle cell sarcoma with rhabdomyosarcoma-like features, DICER1 mutant (SCS-RMSlike-DICER1)’’. Our cases provide further evidence of the link between primary intracranial sarcoma and DICER1 mutation which may form a distinct entity.
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Acknowledgements
We thank the advice on pathological diagnosis by Dr. Takanori Hirose (Department of Pathology, Kobe University; patient #1) and Dr. Junko Hirato (Department of Pathology, Gunma University; patient #2), and technical assistance by Ms. Erika Komura (Kanazawa University) and Ms. Yuko Hibiya (National Cancer Center Research Institute).
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List of 93 sequenced genes (DOCX 15 kb)
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Sakaguchi, M., Nakano, Y., Honda-Kitahara, M. et al. Two cases of primary supratentorial intracranial rhabdomyosarcoma with DICER1 mutation which may belong to a “spindle cell sarcoma with rhabdomyosarcoma-like feature, DICER1 mutant”. Brain Tumor Pathol 36, 174–182 (2019). https://doi.org/10.1007/s10014-019-00352-z
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DOI: https://doi.org/10.1007/s10014-019-00352-z