FAP and laryngotracheoesophageal cleft: It is a membrane‐bound serine dipeptidyl peptidase composed of 760 amino acids.[253] FAP is nearly absent in healthy tissues but is upregulated 14–18‐fold in cirrhosis and LC compared to healthy liver tissue.[254] FAP supports tumor growth through multiple mechanisms, with one consistent finding being its role in promoting tumor cell proliferation, migration, and invasion, all of which contribute to tumor progression.