Clinicopathological heterogeneity in ovarian clear cell adenocarcinoma: a study on individual therapy practice

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This study re-evaluated 46 ovarian clear cell adenocarcinomas, dividing them into pure and mixed types, and found clinicopathological heterogeneity associated with prognosis and potentially guiding treatment.

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This paper re-evaluated the pathology of 46 ovarian clear cell adenocarcinomas (CCAs) by separating them into pure-type CCAs (35 cases) and mixed-type CCAs that also contained endometrioid and/or serous components (11 cases), using immunohistochemistry for ARID1A, p53, PTEN, Annexin 4, HNF-1β, and WT-1. Patients with endometriosis were younger than those without endometriosis among pure-type CCAs, and in pure-type cases ARID1A and p53 expression patterns were mutually altered, with altered p53 expression associated with worse prognosis. In mixed-type CCAs, immunohistochemical patterns indicated internal transition between histological components. The study is limited by its retrospective re-pathology of a relatively small single-study set of tumors, so the findings are based on this selected cohort, not a broadly randomized population. Relevance to endometriosis: the paper directly discusses endometriosis as the assumed precursor context for CCA and reports that pure-type CCAs associated with endometriosis occurred in younger patients.

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Abstract

Ovarian clear cell adenocarcinoma (CCA) has been believed to be a lethal histological subtype of an epithelial ovarian adenocarcinoma (EOA); its precursor has been assumed to be endometriosis. However, it has been reported that CCAs occasionally exhibit different clinical behaviors, suggesting that CCAs might not belong to a single category. We focused on CCAs combined with other histological types of EOAs; we re-evaluated the pathology of 46 CCAs and divided them into two subgroups: 35 CCAs alone (pure-type CCAs); and 11 CCAs with other histological types, endometrioid adenocarcinomas (EAs) or/and serous adenocarcinomas (SAs) (mixed-type CCAs). Immunohistochemical analysis for expression of ARID1A, p53, PTEN, Annexin 4, hepatocyte nuclear factor-1β (HNF-1β), and WT-1 was employed. We identified that patients with endometriosis were younger than those without endometriosis in pure-type CCAs (P < 0.005). In mixed-type CCAs, the immunohistochemical-staining patterns revealed internal transition of each histological component. In pure-type CCAs, expressions of ARID1A and p53 were mutually altered, and altered expression of p53 was associated with worse prognosis than that of ARID1A (P < 0.001). Our results provide evidence that CCAs would have clinicopathological heterogeneity, determining the patient's prognosis. Furthermore, immunohistochemical analysis may shed light on the selection of appropriate treatment, including chemotherapy.
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Abstract

Ovarian clear cell adenocarcinoma (CCA) has been believed to be a lethal histological subtype of an epithelial ovarian adenocarcinoma (EOA); its precursor has been assumed to be endometriosis. However, it has been reported that CCAs occasionally exhibit different clinical behaviors, suggesting that CCAs might not belong to a single category. We focused on CCAs combined with other histological types of EOAs; we re-evaluated the pathology of 46 CCAs and divided them into two subgroups: 35 CCAs alone (pure-type CCAs); and 11 CCAs with other histological types, endometrioid adenocarcinomas (EAs) or/and serous adenocarcinomas (SAs) (mixed-type CCAs). Immunohistochemical analysis for expression of ARID1A, p53, PTEN, Annexin 4, hepatocyte nuclear factor-1β (HNF-1β), and WT-1 was employed. We identified that patients with endometriosis were younger than those without endometriosis in pure-type CCAs (P < 0.005). In mixed-type CCAs, the immunohistochemical-staining patterns revealed internal transition of each histological component. In pure-type CCAs, expressions of ARID1A and p53 were mutually altered, and altered expression of p53 was associated with worse prognosis than that of ARID1A (P < 0.001). Our results provide evidence that CCAs would have clinicopathological heterogeneity, determining the patient’s prognosis. Furthermore, immunohistochemical analysis may shed light on the selection of appropriate treatment, including chemotherapy. Similar content being viewed by others

References

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N Engle J Med 337:529–534 Ayhan A, Mao TL, Seckin T, Wu Ch, Guan B, Ogawa H, Futagami M, Mizukami H, Yokoyama Y, Kurman RJ, Shih Ie M (2012) Loss of ARID1A expression is an early molecular event in tumor progression from ovarian endometriotic cyst to clear cell and endometrioid carcinoma. Int J Gynecol Cancer 22:1310–1315 Acknowledgments We thank Dr. Ken-ichi Iyama (Department of Surgical Pathology, Kumamoto University Hospital) for his help with the diagnosis of the 46 cases. We also thank Ms. Ai Aoki (Department of Obstetrics and Gynecology, Faculty of Life Sciences, Kumamoto University) for her technical assistance. This research was supported by a grant from Grants-in-Aid for Scientific Research (B) 21390454. Conflict of interest The authors have no conflict of interest. Author information Authors and Affiliations Corresponding author Rights and permissions About this article Cite this article Matsuo, Y., Tashiro, H., Yanai, H. et al. Clinicopathological heterogeneity in ovarian clear cell adenocarcinoma: a study on individual therapy practice. Med Mol Morphol 48, 146–154 (2015). https://doi.org/10.1007/s00795-014-0090-z Received: Accepted: Published: Issue date: DOI: https://doi.org/10.1007/s00795-014-0090-z

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endometriosis

MeSH descriptors

Adenocarcinoma, Clear Cell Neoplasms, Glandular and Epithelial Ovarian Neoplasms Precision Medicine Adenocarcinoma, Clear Cell Adenocarcinoma, Clear Cell Adenocarcinoma, Clear Cell Adult Aged Aged, 80 and over Annexin A4 Annexin A4 Biomarkers, Tumor Biomarkers, Tumor Carcinoma, Ovarian Epithelial DNA-Binding Proteins Endometriosis Female Hepatocyte Nuclear Factor 1-beta Hepatocyte Nuclear Factor 1-beta

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