ASAP3 and cancer: To identify potential novel interactors of ACAP4 that is highly expressed in human cancers (Okabe et al., 2004; Fang et al., 2006; Chen et al., 2011), we generated an affinity matrix covalently coupled to an anti-ACAP4 antibody and carried out a proteomic search for proteins that bind to ACAP4 in HeLa cells (Fang et al., 2006).