SPINT2 (Serine Peptidase Inhibitor, Kunitz Type 2): SPINT2, also known as HAI-2 (Hepatocyte Growth Factor Activator Inhibitor-2), is a serine protease inhibitor that plays a crucial role in regulating proteolytic pathways, including those involved in cell growth, migration, and invasion. SPINT2 is particularly important in inhibiting the activity of matriptase, a protease involved in epithelial barrier function and cellular signaling. Loss of SPINT2 function has been associated with increased risk of tumor progression and metastasis, highlighting its role in cancer suppression....