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. The gene discussed is FAP; the disease is neoplasm.