APBB1IP (Amyloid Beta Precursor Protein-Binding Family B Member 1 Interacting Protein), also known as RIAM, is a protein that plays a key role in integrin activation, which is essential for cell adhesion and migration. By linking Rap1 GTPases to the actin cytoskeleton, APBB1IP supports cell attachment to the extracellular matrix, affecting immune cell function, wound healing, and tumor metastasis. Its role in these processes makes it significant for research on immune regulation and cancer.