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Loss of SMARCB1/INI1 expression in poorly differentiated chordomas

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Abstract

Chordomas are malignant neoplasms that typically arise in the axial spine and primarily affect adults. When chordomas arise in pediatric patients they are more likely to display unusual histological features and aggressive behavior. We noted the absence of SMARCB1/INI1 expression by immunohistochemistry in an index case of poorly differentiated chordoma of the sacrum, leading us to further examine SMARCB1/INI1 expression as well as that of brachyury, a highly specific marker of notochordal differentiation, in 3 additional poorly differentiated chordomas of the clivus, 10 typical chordomas, and 8 atypical teratoid/rhabdoid tumors (AT/RTs). All 4 poorly differentiated chordomas and all AT/RTs lacked nuclear expression of SMARCB1/INI1, while the 10 typical chordomas maintained strong nuclear SMARCB1/INI1 immunoreactivity. All 10 typical and 4 poorly differentiated chordomas expressed brachyury; all 8 AT/RTs were brachyury immunonegative. Cytogenetic evaluation utilizing FISH probes near the SMARCB1/INI1 locus on chromosome 22q was also performed in all of the poorly differentiated chordomas in this series. Three of the four poorly differentiated chordomas had evidence for deletion of this region by FISH. Analysis of the SMARCB1/INI1 gene sequence was performed using formalin-fixed paraffin-embedded tissue in all cases and no point mutations were observed. In summary, all poorly differentiated chordomas in this series showed the absence of SMARCB1/INI1 expression, and were reliably distinguished from AT/RTs, clinically by their characteristic primary sites of origin and pathologically by strong nuclear brachyury expression. Our findings reveal a likely role for SMARCB1/INI1 in a subset of chordomas with aggressive features.

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Acknowledgments

The authors wish to acknowledge the following members of the Stanford Department of Pathology Cytogenetics Laboratory: Ilana Galperin for expertly preparing all of the FISH hybridizations and Lisa Karplak and Marcy Acquafresca for invaluable assistance in chromosome analyses. The authors also thank Reina Zuehlke-Jenisch, Kiel, for her valuable assistance in the molecular studies performed in Kiel. We are also grateful to Norm Cyr, Digital Imaging Specialist in the Stanford University Department of Pathology for his expertise.

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Correspondence to Bret C. Mobley.

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Mobley, B.C., McKenney, J.K., Bangs, C.D. et al. Loss of SMARCB1/INI1 expression in poorly differentiated chordomas. Acta Neuropathol 120, 745–753 (2010). https://doi.org/10.1007/s00401-010-0767-x

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  • DOI: https://doi.org/10.1007/s00401-010-0767-x

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