Journal of Pathology and Translational Medicine

Original Article

Can BAP1 expression loss in mesothelial cells be an indicator of malignancy?: Hanife Gulnihal Ozdemir, Sermin Coban Kokten, Nagehan Ozdemir Barisik; J Pathol Transl Med. 2020;54(6):497-503. Published online November 9, 2020; DOI: https://doi.org/10.4132/jptm.2020.09.14

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Background
Malignant mesothelioma is a highly aggressive tumor that can be confused with a benign mesothelial lesion, especially cytomorphologic lesions. BRCA1-associated protein 1 (BAP1) acts as a tumor suppressor. In this study, we aim to investigate the value of BAP1 staining of malignant mesothelioma cases with expression loss and diagnosis in cell block and biopsy tissue.
Methods
Between January 2009 and March 2017, 64 mesotheliomas, 117 reactive mesothelial hyperplasias, and 20 fibrinous pleuritis/pericarditis were diagnosed with morphologic and immunohistochemical findings in our pathology clinic and were included in the study. Formalin-fixed, paraffin-embedded tissues were immunohistochemically examined for BAP1. Inflammatory and stromal cells were used as positive internal controls. BAP1 was assessed for nuclear staining in mesothelial cells.
Results
Examinations of the relationship between patient diagnosis and BAP1 biopsy status showed that the BAP1 loss rate (76.6%) was significantly higher in malignant mesothelioma cases than in other benign diseases (0%) (p<.001). Sensitivity and specificity were 76.56% and 100%, respectively, for biopsy tissue from malignant mesothelioma. Sensitivity and specificity were both 100% for BAP1 test on cell block tissue. Furthermore, the consistency between BAP1 cell block and biopsy results was excellent (ĸ=0.90) and the correlation was significant (p<.001).
Conclusions
This study shows that BAP1 expression loss in both cytology and biopsy tissue in biopsy-confirmed malignant mesothelioma cases is an essential parameter for malignant mesothelioma diagnosis.

Citations

Citations to this article as recorded by

Thrombocytosis as a paraneoplastic syndrome in metastatic malignant peritoneal mesothelioma of biphasic morphology mimicking ovarian adenocarcinoma: A case report
Moustafa S. Alhamadh, Rakan B. Alanazi, Osama Mohaamad Wadaan, Abdulrahman Yousef Alhabeeb, Mohammad Alkaiyat, Ohoud Zaid Aljarbou, Fouad Sabatin
Clinical Case Reports.2023;[Epub] CrossRef
Primary cardiac mesothelioma presenting with fulminant recurrent pericarditis: a case report
Shmuel Schwartzenberg, Yaron Shapira, Victor Rubachevski, Ram Sharony, Harry Klimis, Domenico Filomena, Edgar Francisco Carrizales Sepulveda, Nikolaos Spinthakis, Jonathan Senior
European Heart Journal - Case Reports.2023;[Epub] CrossRef

Case Reports

Analysis of Pulmonary Asbestos Body in Malignant Mesothelioma: A case report.: Hoon Kyu Oh, Jae Yoe Ro, Chul Jong Yoon, Je Geun Chi; Korean J Pathol. 1999;33(5):361-366.

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Abstract PDF: The association between occupational asbestos exposure and the subsequent development of malignant mesothelioma of pleura is well recognized. We analyzed an asbestos body by energy dispersive X-ray analyser in a case of malignant mesothelioma of pleura who had a history of asbestos exposure 30 years ago. In transmission electron microscope, the asbestos body was composed of a core of refractile thin asbestos fiber bundle and beaded masses of electron-dense iron and protein complex. The core fibers were analyzed as an amphibole type crocidolite fiber [(Na2Fe3Fe2(Si8O22)(OH)2] which composed of high content of silicon, iron and sodium.

Malignant Deciduoid Mesothelioma: A Case Report.: Jung Uee Lee, Bum Kyeong Kim, Yoon Mee Kim, Hae Joung Sul, Kyung Bok Lee, Hoi Young Lee; Korean J Pathol. 2007;41(6):416-419.

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Abstract PDF: Malignant deciduoid mesothelioma is a rare malignant neoplasm occurring in the peritoneum of young women. We report a case of malignant deciduoid mesothelioma that occurred in the omentum of a 47-year-old woman. The patient had never exposed to asbestos and had no history of cesarean section. The lesions were multiple infiltrative nodules affected the peritoneal cavity, omentum, and surface of the uterus with both ovaries. Microscopically, the nodules were composed of mesothelial cells similar to decidual cells

Original Article

Peritoneal Diffuse Anaplastic Malignant Mesothelioma Simulating Anaplastic Carcinoma.: Mee Yon Cho, Soon Hee Jung, Woo Ick Jang, Dong Su Cha; Korean J Pathol. 1994;28(2):206-209.

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Abstract PDF: A case of diffuse malignant mesothelioma of peritoneum which was difficult to distinguish from metastatic anaplastic carcinoma or malignant melanoma was presented. The patient was a 50 year-old woman and complained of an abdominal pain and ascites for 20 days. Histologically, the tumor cells showed highly anaplastic appearance with sheet-like arrangement without any papillary or tubular structure. They stained Positive for cytokeratin and vimentin and negative for CEA, S-100 protein and melanoma associated antigen. A few cells within the tumor showed Positive reactivity to desmin. Ultrastructurally, the tumor cells had characteristic findings of mesothelioma such as long, exuberant, wavy microvilli with 10 to 12 of length/diameter ratio. The patient died 3 months after the diagnosis in spite of intraperitoneal chemotherapy.

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