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Immunohistochemistry or Molecular Analysis: Which Method Is Better for Subtyping Craniopharyngioma?

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Abstract

Craniopharyngioma (CP) is mainly classified into two pathological subtypes: adamantinomatous (ACP) and papillary (PCP). CTNNB1 (β-catenin) mutations are detected in ACPs, and the BRAF V600E mutation is detected in PCPs. However, genetic analysis is not always possible in general medical practice. In this study, we investigated whether immunohistochemistry could replace genetic analysis as an aid in subtype diagnosis. Here, 38 CP patients who had undergone their first tumor resection were included. Among the 38 cases, 22 were morphologically diagnosed as ACP, 10 cases were diagnosed as PCP, and six cases were diagnosed as undetermined CP that were morphologically difficult to classify as either ACP or PCP. Results of immunohistochemistry and genetic analysis and clinical features were compared. Based on the immunohistochemistry, 26 (22 ACPs and four undetermined CPs) showed nuclear β-catenin expression, 11 (nine PCPs and two undetermined CPs) exhibited positive BRAF V600E immunostaining, and one PCP showed membranous β-catenin expression and negative BRAF V600E immunostaining. Among the 26 nuclear β-catenin expression cases, 11 had CTNNB1 mutations; however, 15 cases had mutations of neither CTNNB1 nor BRAF V600E. All 11 BRAF V600E immunopositive cases had BRAF V600E mutations. When comparing clinical features, pediatric patients and those with tumor calcification and less solid components on MRI more commonly had nuclear β-catenin expression tumors than BRAF V600E immunopositive tumors, reflecting the differences in clinical features between ACP and PCP. Accordingly, immunohistochemistry can replace genetic analysis as an aid to determine the subtype diagnosis of CP in general medical practice.

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Funding

This work was supported in part by a grant from the Foundation for Growth Science.

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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Noriaki Fukuhara, Takeo Iwata, Naoko Inoshita, Katsuhiko Yoshimoto, Hirokazu Fukuhara, Keita Tatsushima, Mitsuo Yamaguchi-Okada, Akira Takeshita, Junko Ito, Yasuhiro Takeuchi, Shozo Yamada, and Hiroshi Nishioka. The first draft of the manuscript was written by Noriaki Fukuhara and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Naoko Inoshita.

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The authors declare that they have no conflict of interest.

Ethical Statement

This study is a retrospective case series and was approved by the institutional review board of Toranomon Hospital (No. 1616) and Tokushima University (No. 714-2).

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Fukuhara, N., Iwata, T., Inoshita, N. et al. Immunohistochemistry or Molecular Analysis: Which Method Is Better for Subtyping Craniopharyngioma?. Endocr Pathol 32, 262–268 (2021). https://doi.org/10.1007/s12022-020-09644-z

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  • DOI: https://doi.org/10.1007/s12022-020-09644-z

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