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 connecting Rap1 GTPases to the actin cytoskeleton, APBB1IP supports cell attachment to the extracellular matrix, influencing immune cell function, wound healing, and tumor metastasis. Its involvement in these processes makes it important for research on immune regulation and cancer.