In veterinary field, vimentin, E-cadherin, pancytokeratin, Wilms tumor 1 (WT1), MUC-1, and calretinin were used to differentiate between reactive mesothelial cells, malignant mesotheliomas, and adenocarcinomas in large felids only through post-mortem [7]. The gene discussed is WT1; the disease is malignant mesothelioma.