Fig. 4: Diagnostic workup of pleural effusion and small biopsy specimens with atypical mesothelial proliferations.
From: Pleural mesothelioma classification—update and challenges

Initial immunohistochemical work-up to confirm mesothelial proliferation should be followed by markers of malignant mesothelial proliferations BAP1 immunohistochemistry and/or FISH for CDKN2A homozygous deletion or MTAP immunohistochemistry as surrogate marker (modified from ref. 30).