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Examples of Immunohistochemically MSLN staining scores. (A) IHC of sarcomatoid MPM being negative for MSLN (Score 0). (B) IHC of low cytoplasmic expression in epithelioid MPM with score 1. (C) IHC showing moderate cytoplasmic expression of MSLN (Score 2). (D) Immunohistochemically strong cytoplasmic expressing MPM with a score of 3. Scale bar indicates 250 µm.
