TTF1 and mesothelioma: Although IMIG (International Mesothelioma Interest Group) recommended Calretinin, D2–40 (podoplanin), WT1 as mesothelioma markers, CEA, TTF-1, Napsin-A, as lung adenocarcinoma markers, and p63, p40, MOC-31 as for lung squamous carcinoma markers4, the additional immunohistochemical markers will surely benefit in some unusual cases.