Expression of marker antigens in MPM.

The histologic type of MPM was classified by pathological diagnosis. The intensity and proportion of staining of MPM cells were evaluated in the entire microscopic field of the specimen. The individual data are described in Table S1. Cases were defined as positive if the Allred score, which is the value of the intensity score plus the proportion score, of the marker was more than 3. In the immunostaining of calretinin or WT-1, staining in the nucleus, but not the cytoplasm, was designated as a positive sample. PD, poorly differentiated.