PMID- 26288396 OWN - NLM STAT- MEDLINE DCOM- 20160817 LR - 20220408 IS - 1543-2165 (Electronic) IS - 0003-9985 (Linking) VI - 140 IP - 4 DP - 2016 Apr TI - New Markers for Separating Benign From Malignant Mesothelial Proliferations: Are We There Yet? PG - 318-21 LID - 10.5858/arpa.2015-0240-SA [doi] AB - CONTEXT: The separation of benign from malignant mesothelial proliferations is crucial to patient care but is frequently morphologically difficult. OBJECTIVE: To briefly review adjunctive tests claimed to be useful in this setting and to examine in detail 2 new tests: p16 fluorescence in situ hybridization (FISH) and BRCA1-associated protein 1 (BAP1) immunohistochemistry. DESIGN: Literature review with emphasis on p16 FISH and BAP1 immunohistochemistry. RESULTS: Glucose transporter-1, p53, insulin-like growth factor 2 messenger RNA-binding protein 3 (IMP-3), desmin, and epithelial membrane antigen have all been claimed to mark either benign or malignant mesothelial processes, but in practice they at best provide statistical differences in large series of cases, without being useful in an individual case. Homozygous deletion of p16 by FISH or loss of BAP1 has only been reported in malignant mesotheliomas and not in benign mesothelial proliferations. BAP1 appears to be lost more frequently in epithelial than mixed or sarcomatous mesotheliomas. Homozygous deletion of p16 by FISH is seen in pleural epithelial, mixed, and sarcomatous mesotheliomas, but it is much less frequent in peritoneal mesothelioma. The major drawback to both these tests is limited sensitivity; moreover, failure to find p16 deletion or BAP1 loss does not make a mesothelial process benign. CONCLUSIONS: In the context of a mesothelial proliferation, the finding of homozygous deletion of p16 by FISH or loss of BAP1 by immunohistochemistry is, thus far, 100% specific for malignant mesothelioma. The limited sensitivity of each test may be improved to some extent by running both tests. FAU - Churg, Andrew AU - Churg A FAU - Sheffield, Brandon S AU - Sheffield BS FAU - Galateau-Salle, Francoise AU - Galateau-Salle F AD - From the Department of Pathology, Vancouver General Hospital and University of British Columbia, Vancouver, British Columbia, Canada (Drs Churg and Sheffield); and Service Anatomie Pathologique, Centre National Referent MESOPATH, CHU du Caen, Caen, France (Dr Galateau-Salle). Dr Galateau-Salle is now with the Department of Pathology, Centre Leon Berard, Lyon, France. LA - eng PT - Journal Article DEP - 20150819 PL - United States TA - Arch Pathol Lab Med JT - Archives of pathology & laboratory medicine JID - 7607091 RN - 0 (BAP1 protein, human) RN - 0 (Biomarkers, Tumor) RN - 0 (CDKN2A protein, human) RN - 0 (Cyclin-Dependent Kinase Inhibitor p16) RN - 0 (Mucin-1) RN - 0 (Neoplasm Proteins) RN - 0 (Tumor Suppressor Proteins) RN - EC 3.4.19.12 (Ubiquitin Thiolesterase) SB - IM MH - Biomarkers, Tumor/*genetics/metabolism MH - Cell Proliferation MH - Cyclin-Dependent Kinase Inhibitor p16 MH - Diagnosis, Differential MH - Epithelium/pathology MH - Female MH - Gene Deletion MH - Humans MH - Immunohistochemistry MH - In Situ Hybridization, Fluorescence MH - Lung Neoplasms/*pathology MH - Mesothelioma/*pathology MH - Mesothelioma, Malignant MH - Mucin-1/genetics/metabolism MH - Neoplasm Proteins/genetics/metabolism MH - Peritoneal Neoplasms/*pathology MH - Pleura/pathology MH - Pleural Neoplasms/*pathology MH - Tumor Suppressor Proteins/genetics/metabolism MH - Ubiquitin Thiolesterase/genetics/metabolism EDAT- 2015/08/20 06:00 MHDA- 2016/08/18 06:00 CRDT- 2015/08/20 06:00 PHST- 2015/08/20 06:00 [entrez] PHST- 2015/08/20 06:00 [pubmed] PHST- 2016/08/18 06:00 [medline] AID - 10.5858/arpa.2015-0240-SA [doi] PST - ppublish SO - Arch Pathol Lab Med. 2016 Apr;140(4):318-21. doi: 10.5858/arpa.2015-0240-SA. Epub 2015 Aug 19.