CLDN7 and lung adenocarcinoma: Further, the authors analyzed datasets, such as CCLE (Cancer Cell Line Encyclopedia), PDAC samples (Pancreatic Ductal Adenocarcinoma), and lung adenocarcinoma (LUAD), demonstrating that LINC00261 expression correlated positively with epithelial markers (e.g., CDH1, KRT19, CLDN7 (cadherin 1, cytokeratin 19, claudin 7) and negatively with mesenchymal markers, highlighting its role in regulating differentiation and EMT processes [4].