Calretinin, Wilms tumor 1, D2-40, cytokeratin 5/6, thrombomodulin, and human bone marrow endothelium marker-1 are key markers for mesothelioma, while carcinoembryonic antigen, antihuman epithelial antigen, TAG-72, Ep-CAM/Epithelial Specific Antigen, and thyroid transcription factor 1 are markers for lung adenocarcinoma.7 This evidence concerns the gene CEACAM5 and lung adenocarcinoma.