PMID- 29763720 OWN - NLM STAT- MEDLINE DCOM- 20190506 LR - 20201218 IS - 1532-8392 (Electronic) IS - 0046-8177 (Linking) VI - 79 DP - 2018 Sep TI - BAP1 loss is unusual in well-differentiated papillary mesothelioma and may predict development of malignant mesothelioma. PG - 168-176 LID - S0046-8177(18)30158-8 [pii] LID - 10.1016/j.humpath.2018.05.001 [doi] AB - Literature on BRCA1-associated protein 1 (BAP1) expression status in well-differentiated papillary mesothelioma (WDPM) is limited. In the present study, we examined the prevalence of BAP1 loss in WDPM by immunohistochemistry with clinical correlation, along with CDKN2A deletion status by fluorescence in situ hybridization (FISH). Eight patients diagnosed as having WDPM were identified from the surgical pathology file. Adenomatoid tumors (n = 8) and malignant mesothelioma (MM) (n = 39) were included for comparison. BAP1 immunohistochemistry was performed on representative block(s) from each case. CDKN2A FISH was also performed in the WDPMs and adenomatoid tumors. Clinical information was obtained from the medical records. Three of 8 WDPM patients showed synchronous or metachronous MM. All 3 cases showed BAP1 loss in both WDPM and the matched MM. Single-nucleotide polymorphism genomic microarray (n = 3) demonstrated a similar genetic profile in the WDPM and MM components, which supports their clonal relationship. The remaining 5 WDPM cases had intact BAP1 expression and had no evidence of disease on follow-up imaging studies at 1 to 71 months (median, 35 months). All 8 adenomatoid tumors had intact BAP1 expression, whereas 17 of 39 MM had BAP1 loss. CDKN2A FISH was negative for deletion in 4 WDPMs tested (including the case that developed MM) and all 8 adenomatoid tumors. In our study, WDPM did not show CDKN2A deletion in any case. BAP1 loss was also absent in all pure WDPM cases but was identified in all WDPM with synchronous or metachronous MM. Similar genetic landscape in WDPM and MM components suggested their clonal relationship. CI - Copyright (c) 2018 Elsevier Inc. All rights reserved. FAU - Lee, Hee Eun AU - Lee HE AD - Division of Anatomic Pathology, Mayo Clinic, Rochester, MN 55905, USA. FAU - Molina, Julian R AU - Molina JR AD - Division of Medical Oncology, Mayo Clinic, Rochester, MN 55905, USA. FAU - Sukov, William R AU - Sukov WR AD - Division of Anatomic Pathology, Mayo Clinic, Rochester, MN 55905, USA; Division of Molecular Genetics, Mayo Clinic, Rochester, MN 55905, USA. FAU - Roden, Anja C AU - Roden AC AD - Division of Anatomic Pathology, Mayo Clinic, Rochester, MN 55905, USA. FAU - Yi, Eunhee S AU - Yi ES AD - Division of Anatomic Pathology, Mayo Clinic, Rochester, MN 55905, USA. Electronic address: Yi.Joanne@mayo.edu. LA - eng PT - Case Reports PT - Comparative Study PT - Journal Article DEP - 20180512 PL - United States TA - Hum Pathol JT - Human pathology JID - 9421547 RN - 0 (BAP1 protein, human) RN - 0 (Biomarkers, Tumor) RN - 0 (CDKN2A protein, human) RN - 0 (Cyclin-Dependent Kinase Inhibitor p16) RN - 0 (Tumor Suppressor Proteins) RN - EC 3.4.19.12 (Ubiquitin Thiolesterase) SB - IM MH - Adult MH - Aged MH - Biomarkers, Tumor/*analysis/genetics MH - Case-Control Studies MH - *Cell Differentiation MH - Cyclin-Dependent Kinase Inhibitor p16/genetics MH - Down-Regulation MH - Female MH - Gene Deletion MH - Genetic Predisposition to Disease MH - Humans MH - Immunohistochemistry MH - In Situ Hybridization, Fluorescence MH - Lung Neoplasms/*enzymology/genetics/pathology/therapy MH - Male MH - Mesothelioma/*enzymology/genetics/pathology/therapy MH - Mesothelioma, Malignant MH - Middle Aged MH - Neoplasms, Multiple Primary MH - Neoplasms, Second Primary MH - Phenotype MH - Polymorphism, Single Nucleotide MH - Tumor Suppressor Proteins/*analysis/genetics MH - Ubiquitin Thiolesterase/*analysis/genetics OTO - NOTNLM OT - BAP1 OT - CDKN2A OT - Malignant mesothelioma OT - Single-nucleotide polymorphism genomic microarray OT - Well-differentiated papillary mesothelioma OT - p16 EDAT- 2018/05/16 06:00 MHDA- 2019/05/07 06:00 CRDT- 2018/05/16 06:00 PHST- 2017/11/21 00:00 [received] PHST- 2018/05/01 00:00 [revised] PHST- 2018/05/02 00:00 [accepted] PHST- 2018/05/16 06:00 [pubmed] PHST- 2019/05/07 06:00 [medline] PHST- 2018/05/16 06:00 [entrez] AID - S0046-8177(18)30158-8 [pii] AID - 10.1016/j.humpath.2018.05.001 [doi] PST - ppublish SO - Hum Pathol. 2018 Sep;79:168-176. doi: 10.1016/j.humpath.2018.05.001. Epub 2018 May 12.