Abstract
The current knowledge about the immunohistochemical features of adult granulosa cell tumor (AGCT) is mostly limited to the “traditional” immunohistochemical markers of sex cord differentiation, such as inhibin, calretinin, FOXL2, SF1, and CD99. Knowledge about the immunohistochemical markers possibly used for predictive purpose is limited. In our study, we focused on the immunohistochemical examination of 290 cases of AGCT classified based on strict diagnostic criteria, including molecular testing. The antibodies used included 12 of the “diagnostic” antibodies already examined in previous studies, 10 antibodies whose expression has not yet been examined in AGCT, and 7 antibodies with possible predictive significance, including the expression of HER2, PD-L1, CTLA4, and 4 mismatch repair (MMR) proteins. The results of our study showed expression of FOXL2, SF1, CD99, inhibin A, calretinin, ER, PR, AR, CKAE1/3, and CAIX in 98%, 100%, 90%, 78%, 45%, 41%, 94%, 82%, 26%, and 9% of AGCT, respectively. GATA3, SATB2, napsin A, MUC4, TTF1, and CD44 were all negative. PTEN showed a loss of expression in 71% of cases and DPC4 in 4% of cases. The aberrant staining pattern (overexpression) of p53 was found in 1% (3/268) of cases, 2 primary tumors, and 1 recurrent case. Concerning the predictive markers, the results of our study showed that AGCT is microsatellite stable, do not express PD-L1, and are HER2 negative. The CTLA4 expression was found in almost 70% of AGCT tumor cells.
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Acknowledgements
The authors wish to extend their gratitude to Mgr. Zachary H. K. Kendall, B.A. (Institute for History of Medicine and Foreign Languages, First Faculty of Medicine, Charles University in Prague) for the English language editing.
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This work was supported by the Ministry of Health, Czech Republic (MH CZ DRO-VFN 64165 and AZV NU21-03–00238), by Charles University (Project UNCE24/MED/018, SVV 260631), and by the European Regional Development Fund (EF16_013/0001674 and BBMRI_CZ LM2023033).
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KN and PD drew up the study concept and design. All authors participated on material preparation, data collection, and/or analyses. The first draft of the manuscript was written by KN. All authors commented on previous versions of the manuscript and approved the final manuscript.
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Němejcová, K., Šafanda, A., Kendall Bártů, M. et al. An extensive immunohistochemical analysis of 290 ovarian adult granulosa cell tumors with 29 markers. Virchows Arch (2024). https://doi.org/10.1007/s00428-024-03854-0
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DOI: https://doi.org/10.1007/s00428-024-03854-0