title: Cytopathology of malignant mesothelioma: a stepwise logistic regression analysis.
abstract: Twenty-four cytologic features, previously reported to be useful in the distinction of malignant mesothelioma, adenocarcinoma, and benign mesothelial proliferation in serous effusions were assessed. Forty-four cases of malignant mesotheliomas, 46 cases of metastatic adenocarcinomas, and 30 cases of benign mesothelial proliferations were examined for these parameters. When these cytologic features were subjected to a stepwise logistic regression analysis, five features were selected to distinguish malignant mesothelioma from adenocarcinoma. These were true papillary aggregates, multinucleation with atypia, cell-to-cell apposition, acinus-like structures, and balloon-like vacuolation, the latter two features being characteristic of adenocarcinoma. The four variables selected to distinguish malignant mesothelioma from benign mesothelial proliferations were nuclear pleomorphism, macronucleoli, cell-in-cell engulfment, and monolayer cell groups, the latter being a feature of benign proliferations. Using these selected variables, the logistic model correctly predicted 95.4% of cases of malignant mesothelioma versus 100% of adenocarcinoma and 100% of malignant mesotheliomas versus 90% of benign mesothelial proliferations. The results of regression analysis suggest that many of the previously described cytologic features are not important diagnostic discriminators.
authors.affiliation: Division of Tissue Pathology, Institute of Medical and Veterinary Science, Adelaide, South Australia.
authors.forename: M W
authors.initials: MW
authors.lastname: Stevens
authors.forename: A S
authors.initials: AS
authors.lastname: Leong
authors.forename: N L
authors.initials: NL
authors.lastname: Fazzalari
authors.forename: K D
authors.initials: KD
authors.lastname: Dowling
authors.forename: D W
authors.initials: DW
authors.lastname: Henderson
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology* / Q000648:ultrastructure; D001202:Ascitic Fluid / Q000473:pathology*; D003937:Diagnosis, Differential; D004848:Epithelium / Q000473:pathology; D006801:Humans; D008654:Mesothelioma / Q000473:pathology* / Q000648:ultrastructure; D010490:Pericardial Effusion / Q000473:pathology*; D010996:Pleural Effusion / Q000473:pathology*; D012044:Regression Analysis