KRT7 and mesothelioma: We also examined other mesothelial or mesothelioma-associated markers such as CK7, calretinin, WT-1, D2-40, and EMA in a small number of cases, and these antibodies were less sensitive and less robust than a pan-keratin immunostain, appearing weak and in only a small subset of the keratin-expressing stromal cell population (S2 Fig).