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