PMID- 29053210 OWN - NLM STAT- MEDLINE DCOM- 20190306 LR - 20220318 IS - 1934-6638 (Electronic) IS - 1934-662X (Linking) VI - 126 IP - 1 DP - 2018 Jan TI - A combination of MTAP and BAP1 immunohistochemistry in pleural effusion cytology for the diagnosis of mesothelioma. PG - 54-63 LID - 10.1002/cncy.21928 [doi] AB - BACKGROUND: Homozygous deletion of 9p21 detected by fluorescence in situ hybridization (FISH) and loss of BRCA1-associated protein 1 (BAP1) expression detected by immunohistochemistry (IHC) are useful for the differentiation between malignant pleural mesothelioma (MPM) and reactive mesothelial hyperplasia. The authors previously described that IHC expression of the protein product of the methylthioadenosine phosphorylase (MTAP) gene, which is localized in the 9p21 chromosomal region, was correlated with the deletion status of 9p21 FISH in MPM tissues. In the current study, the authors investigated whether a combination of MTAP and BAP1 IHC could distinguish MPM from reactive mesothelial cells (RMC) in cell blocks obtained from pleural effusions. METHODS: The authors examined IHC expression of MTAP and BAP1 in cell blocks obtained from pleural effusions of 45 cases of MPM and 21 cases of reactive mesothelial hyperplasia. Furthermore, IHC expression of MTAP was compared with the deletion status of 9p21 FISH. RESULTS: MTAP and BAP1 IHC differentiated MPM from RMC with 100% specificity for both and sensitivities of 42.2% and 60.0%, respectively. The combination of MTAP and BAP1 IHC yielded a sensitivity of 77.8%, which was higher than that of BAP1 IHC alone or 9p21 FISH alone (62.2%). Moreover, a high degree of concordance was observed between the results of MTAP IHC and 9p21 FISH in cell blocks. CONCLUSIONS: A combination of MTAP and BAP1 IHC in cell blocks from pleural effusions appears to be a reliable and useful method for differentiating MPM cells from RMC and can be used in the routine diagnosis of MPM. Cancer Cytopathol 2018;126:54-63. (c) 2017 American Cancer Society. CI - (c) 2017 American Cancer Society. FAU - Kinoshita, Yoshiaki AU - Kinoshita Y AUID- ORCID: 0000-0002-8872-8957 AD - Department of Pathology, Fukuoka University Hospital and School of Medicine, Fukuoka, Japan. AD - Department of Respiratory Medicine, Fukuoka University Hospital and School of Medicine, Fukuoka, Japan. FAU - Hida, Tomoyuki AU - Hida T AD - Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan. FAU - Hamasaki, Makoto AU - Hamasaki M AD - Department of Pathology, Fukuoka University Hospital and School of Medicine, Fukuoka, Japan. FAU - Matsumoto, Shinji AU - Matsumoto S AD - Department of Pathology, Fukuoka University Hospital and School of Medicine, Fukuoka, Japan. FAU - Sato, Ayuko AU - Sato A AD - Department of Pathology, Hyogo College of Medicine, Nishinomiya, Japan. FAU - Tsujimura, Tohru AU - Tsujimura T AD - Department of Pathology, Hyogo College of Medicine, Nishinomiya, Japan. FAU - Kawahara, Kunimitsu AU - Kawahara K AD - Department of Pathology, Osaka Prefectural Medical Center for Respiratory and Allergic Disease, Habikino, Japan. FAU - Hiroshima, Kenzo AU - Hiroshima K AD - Department of Pathology, Tokyo Women's Medical University Yachiyo Medical Center, Yachiyo, Japan. FAU - Oda, Yoshinao AU - Oda Y AD - Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan. FAU - Nabeshima, Kazuki AU - Nabeshima K AD - Department of Pathology, Fukuoka University Hospital and School of Medicine, Fukuoka, Japan. LA - eng PT - Journal Article DEP - 20171020 PL - United States TA - Cancer Cytopathol JT - Cancer cytopathology JID - 101499453 RN - 0 (BAP1 protein, human) RN - 0 (Tumor Suppressor Proteins) RN - EC 2.4.2.1 (Purine-Nucleoside Phosphorylase) RN - EC 2.4.2.28 (5'-methylthioadenosine phosphorylase) RN - EC 3.4.19.12 (Ubiquitin Thiolesterase) SB - IM MH - Aged MH - Aged, 80 and over MH - Female MH - Humans MH - Immunohistochemistry MH - In Situ Hybridization, Fluorescence MH - Lung Neoplasms/*diagnosis/pathology MH - Male MH - Mesothelioma/*diagnosis/pathology MH - Mesothelioma, Malignant MH - Middle Aged MH - Pleural Effusion/*pathology MH - Pleural Neoplasms/*diagnosis/pathology MH - Purine-Nucleoside Phosphorylase/*analysis MH - Tumor Suppressor Proteins/*analysis MH - Ubiquitin Thiolesterase/*analysis OTO - NOTNLM OT - 9p21 fluorescence in situ hybridization OT - cell block OT - malignant pleural mesothelioma OT - pleural effusion OT - reactive mesothelial hyperplasia EDAT- 2017/10/21 06:00 MHDA- 2019/03/07 06:00 CRDT- 2017/10/21 06:00 PHST- 2017/07/19 00:00 [received] PHST- 2017/09/07 00:00 [revised] PHST- 2017/09/08 00:00 [accepted] PHST- 2017/10/21 06:00 [pubmed] PHST- 2019/03/07 06:00 [medline] PHST- 2017/10/21 06:00 [entrez] AID - 10.1002/cncy.21928 [doi] PST - ppublish SO - Cancer Cytopathol. 2018 Jan;126(1):54-63. doi: 10.1002/cncy.21928. Epub 2017 Oct 20.