PMID- 27121152 OWN - NLM STAT- MEDLINE DCOM- 20170118 LR - 20210208 IS - 1097-0339 (Electronic) IS - 1097-0339 (Linking) VI - 44 IP - 7 DP - 2016 Jul TI - BAP1 Immunostain and CDKN2A (p16) FISH Analysis: Clinical Applicability for the Diagnosis of Malignant Mesothelioma in Effusions. PG - 599-606 LID - 10.1002/dc.23491 [doi] AB - BACKGROUND: Loss of BAP1 by immunohistochemistry (IHC) and CDKN2A(p16) deletion by fluorescence in situ hybridization (FISH) have been proposed to distinguish malignant mesothelioma (MM) from atypical reactive mesothelial proliferations (ARMP) in effusions but it is uncertain whether both tests are needed routinely. METHODS: Paraffin embedded blocks from 67 effusions (32 MM, 35 ARMP) were evaluated with BAP1 IHC. 38 of them (17 MM, 21 ARMP) were also analyzed with CDKN2A (p16) FISH. Criteria for MM were absence of BAP1 nuclear staining in >50% of atypical mesothelial cells in the presence of a positive internal control, and/or CDKN2A(p16) homozygous or hemizygous deletion pattern in >15% or >41.5% of atypical mesothelial cells, respectively. Sensitivity (SS), specificity (SP), positive, and negative predictive values (PPV, NPV) for MM were calculated. RESULTS: 17 of 32 MM were correctly diagnosed by IHC (SS 53.1%, SP 85.7%, PPV 77.3%, NPV 64.3% for MM). In the subset of 38 cases studied by IHC and FISH, the SS, SP, PPV, and NPV of IHC for MM were 41.2, 81.0, 63.6, and 63.0%, respectively. 7 of 17 MM were diagnosed by FISH (SS 41.2%, SP 100%, PPV 100%, NPV 67.7% for MM). CONCLUSION: BAP1 IHC and CDKN2A(p16) FISH yield similar sensitivities for MM in paired samples but FISH has a higher specificity. To diagnose effusions with atypical mesothelial cells, use of both tests is optimal. However, BAP1 IHC alone may be sufficient to diagnose MM when clinical, imaging, and cytological findings strongly suggest MM. Diagn. Cytopathol. 2016. (c) 2016 Wiley Periodicals, Inc. Diagn. Cytopathol. 2016;44:599-606. (c) 2016 Wiley Periodicals, Inc. CI - (c) 2016 Wiley Periodicals, Inc. FAU - Walts, Ann E AU - Walts AE AD - Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, California. FAU - Hiroshima, Kenzo AU - Hiroshima K AD - Department of Pathology, Tokyo Women's Medical University Yachiyo Medical Center, Yachiyo, Japan. FAU - McGregor, Stephanie M AU - McGregor SM AD - Department of Pathology, University of Chicago Hospitals, Chicago, Illinois. FAU - Wu, Di AU - Wu D AD - Department of Pathology, Tokyo Women's Medical University Yachiyo Medical Center, Yachiyo, Japan. FAU - Husain, Aliya N AU - Husain AN AD - Department of Pathology, University of Chicago Hospitals, Chicago, Illinois. FAU - Marchevsky, Alberto M AU - Marchevsky AM AD - Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, California. LA - eng PT - Evaluation Study PT - Journal Article DEP - 20160428 PL - United States TA - Diagn Cytopathol JT - Diagnostic cytopathology JID - 8506895 RN - 0 (BAP1 protein, human) RN - 0 (CDKN2A protein, human) RN - 0 (Cyclin-Dependent Kinase Inhibitor p16) RN - 0 (Neoplasm Proteins) RN - 0 (Tumor Suppressor Proteins) RN - EC 3.4.19.12 (Ubiquitin Thiolesterase) SB - IM MH - Adult MH - Aged MH - Aged, 80 and over MH - Ascitic Fluid/metabolism/*pathology MH - Cyclin-Dependent Kinase Inhibitor p16 MH - Epithelial Cells/metabolism/pathology MH - Female MH - Humans MH - In Situ Hybridization, Fluorescence MH - Male MH - Mesothelioma/metabolism/*pathology MH - Middle Aged MH - Neoplasm Proteins/genetics/*metabolism MH - Pleural Effusion, Malignant/metabolism/*pathology MH - Tumor Suppressor Proteins/genetics/*metabolism MH - Ubiquitin Thiolesterase/genetics/*metabolism OTO - NOTNLM OT - BAP1 OT - CDKN2A (p16) FISH OT - effusion OT - malignant mesothelioma EDAT- 2016/04/29 06:00 MHDA- 2017/01/19 06:00 CRDT- 2016/04/29 06:00 PHST- 2016/01/07 00:00 [received] PHST- 2016/03/24 00:00 [revised] PHST- 2016/04/04 00:00 [accepted] PHST- 2016/04/29 06:00 [entrez] PHST- 2016/04/29 06:00 [pubmed] PHST- 2017/01/19 06:00 [medline] AID - 10.1002/dc.23491 [doi] PST - ppublish SO - Diagn Cytopathol. 2016 Jul;44(7):599-606. doi: 10.1002/dc.23491. Epub 2016 Apr 28.