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The role of beta-catenin mutation and SOX9 expression in sex cord-stromal tumours of the testis

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Abstract

The WHO classification of testis tumours includes the group of sex cord-stromal tumours. They are divided into several histological types, i.e. Leydig cell (LCT) and Sertoli cell tumours (SCT). Based on the physiological expression of β-catenin in normal testis/Sertoli cells, it was previously shown that SCT can carry a β-catenin mutation, causing a nuclear positivity for β-catenin and cyclin D1. Furthermore, it could be shown that the stabilization of β-catenin in Sertoli cells causes the loss of the Sertoli cell marker SOX9. We wanted to know whether the stabilization of β-catenin in sex cord-stromal tumours influences SOX-9 expression and thus could be used in the diagnosis of sex cord-stromal tumours. Therefore, 53 cases of sex cord-stromal tumours and tumour-like lesions were investigated for their immunohistochemical expressions of β-catenin, cyclin D1 and SOX9. In addition, mutation analyses of the β-catenin gene (exon 3; CTNNB1) were performed. β-catenin mutation in SCT results in nuclear β-catenin and cyclin-D1 expressions on immunohistochemical analysis. The nuclear expression/stabilization of β-catenin causes the loss of SOX9 in these tumours. In contrast, SOX9 is considerably expressed in non-mutated SCT as well as in Sertoli cells of non-neoplastic testes. In summary, immunohistochemical analyses of β-catenin and SOX9 are useful to distinguish SCT from other sex cord-stromal tumours of the testis. Furthermore, the presence of SOX9 indicates that the cells of origin may be Sertoli cells.

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Acknowledgements

We thank Valerie Unterkircher and Stefan Kueffer for the perfect technical assistance. Felix Bremmer is supported by the research program of the Faculty of Medicine, Georg-August-University Göttingen and the Wilhelm-Sander-Stiftung (2016.041.1).

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Correspondence to F. Bremmer.

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Ethical approval for using human material in the present study was obtained from the ethics committee of the University Medical Centre Göttingen (application number: 2/6/16).

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The authors declare that they have no conflict of interest.

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Bremmer, F., Behnes, C.L., Schildhaus, H.U. et al. The role of beta-catenin mutation and SOX9 expression in sex cord-stromal tumours of the testis. Virchows Arch 470, 421–428 (2017). https://doi.org/10.1007/s00428-017-2090-6

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  • DOI: https://doi.org/10.1007/s00428-017-2090-6

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