PMID- 27079839 OWN - NLM STAT- MEDLINE DCOM- 20170118 LR - 20210208 IS - 1097-0339 (Electronic) IS - 1097-0339 (Linking) VI - 44 IP - 7 DP - 2016 Jul TI - Cytologic Differential Diagnosis of Malignant Mesothelioma and Reactive Mesothelial Cells With FISH Analysis of p16. PG - 591-8 LID - 10.1002/dc.23490 [doi] AB - BACKGROUND: Mesothelioma patients often present with serosal effusions, which are ideal for cytopathological diagnoses. However, the morphological overlap between malignant and benign mesothelial proliferation can make a conclusive cytological diagnosis of mesothelioma elusive because immunohistochemical staining does not discriminate definitively between the two in this setting. p16 is deleted in up to 80% of pleural mesotheliomas. The aim of this study was to establish the correlation between the p16 deletion status of the cell block with that of its corresponding tumor using fluorescence in situ hybridization (FISH) analysis for individual patient tumors. METHODS: Twenty-two biopsies and 24 corresponding cell blocks, containing serosal effusions with atypical mesothelial cells from 22 patients with histologically confirmed pleural mesotheliomas, were analyzed with p16 FISH. Seventeen cell blocks consisting of serosal effusions with reactive mesothelial cells from nonmesothelioma cases were also analyzed. Combined immunofluorescence and FISH were also performed. RESULTS: Seventeen of the 22 mesothelioma patients (77.3%) showed homozygous deletions of p16 in the tumor tissue and in the atypical mesothelial cells from the cell blocks. p16 FISH followed by immunofluorescence with EMA was helpful towards identifying the mesothelioma cells in the cell blocks. CONCLUSION: We confirmed that the p16 FISH results obtained from the cell blocks are as reliable as those from the tissue sections. Cell block analysis is recommended for patients with serosal effusions of unknown origins with the following methods: immunohistochemistry should be performed to validate the mesothelial origin, and p16 FISH should be performed to confirm malignancy. Diagn. Cytopathol. 2016;44:591-598. (c) 2016 Wiley Periodicals, Inc. CI - (c) 2016 Wiley Periodicals, Inc. FAU - Hiroshima, Kenzo AU - Hiroshima K AD - Department of Pathology, Tokyo Women's Medical University, Yachiyo Medical Center, Yachiyo, Japan. FAU - Wu, Di AU - Wu D AD - Department of Pathology, Tokyo Women's Medical University, Yachiyo Medical Center, Yachiyo, Japan. FAU - Hasegawa, Mizue AU - Hasegawa M AD - Department of Respirology, Tokyo Women's Medical University, Yachiyo Medical Center, Yachiyo, Japan. FAU - Koh, Eitetsu AU - Koh E AD - Department of Thoracic Surgery, Tokyo Women's Medical University, Yachiyo Medical Center, Yachiyo, Japan. FAU - Sekine, Yasuo AU - Sekine Y AD - Department of Thoracic Surgery, Tokyo Women's Medical University, Yachiyo Medical Center, Yachiyo, Japan. FAU - Ozaki, Daisuke AU - Ozaki D AD - Department of Pathology, Chiba Rosai Hospital, Ichihara, Japan. FAU - Yusa, Toshikazu AU - Yusa T AD - Department of Thoracic Surgery, Chiba Rosai Hospital, Ichihara, Japan. FAU - Walts, Ann E AU - Walts AE AD - Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, California. FAU - Marchevsky, Alberto M AU - Marchevsky AM AD - Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, California. FAU - Nabeshima, Kazuki AU - Nabeshima K AD - Department of Pathology, Fukuoka University Hospital and School of Medicine, Fukuoka, Japan. FAU - Tada, Yuji AU - Tada Y AD - Department of Respirology, Graduate School of Medicine, Chiba University, Chiba, Japan. FAU - Shimada, Hideaki AU - Shimada H AD - Department of Surgery, School of Medicine, Toho University, Tokyo, Japan. FAU - Tagawa, Masatoshi AU - Tagawa M AD - Division of Pathology and Cell Therapy, Chiba Cancer Center Research Institute, Chiba, Japan. LA - eng PT - Journal Article DEP - 20160415 PL - United States TA - Diagn Cytopathol JT - Diagnostic cytopathology JID - 8506895 RN - 0 (Biomarkers, Tumor) RN - 0 (CDKN2A protein, human) RN - 0 (Cyclin-Dependent Kinase Inhibitor p16) RN - 0 (Neoplasm Proteins) SB - IM MH - Aged MH - Aged, 80 and over MH - Biomarkers, Tumor/genetics/*metabolism MH - Case-Control Studies MH - Cyclin-Dependent Kinase Inhibitor p16 MH - Diagnosis, Differential 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 Neoplasms/metabolism/*pathology OTO - NOTNLM OT - cell block OT - cytology OT - fluorescence in situ hybridization (FISH) OT - immunofluorescence OT - mesothelioma OT - p16 EDAT- 2016/04/16 06:00 MHDA- 2017/01/19 06:00 CRDT- 2016/04/16 06:00 PHST- 2015/10/30 00:00 [received] PHST- 2016/03/01 00:00 [revised] PHST- 2016/03/30 00:00 [accepted] PHST- 2016/04/16 06:00 [entrez] PHST- 2016/04/16 06:00 [pubmed] PHST- 2017/01/19 06:00 [medline] AID - 10.1002/dc.23490 [doi] PST - ppublish SO - Diagn Cytopathol. 2016 Jul;44(7):591-8. doi: 10.1002/dc.23490. Epub 2016 Apr 15.