Molecular diagnostics frequently employ biomarkers such as calretinin, CK5/6, WT‐1, mesothelin (MSLN), and D2‐40, whereas lung adenocarcinoma biomarkers typically include TTF‐1, napsin A, CEA, BerEP4, and claudin‐4 [35, 36]. This evidence concerns the gene CALB2 and lung adenocarcinoma.