MUC1 and Pleural effusion: A study23 that investigates the diagnostic usefulness of various markers including EMA and includes 171 effusion cytospin preparations (87 pleural effusion cases and 84 peritoneal cases including 50 RM, 11mesotheliomas, and 110 metastatic adenocarcinomas) showed that EMA was reactive in 13/50 RM samples (26%).