Promotes anchorage-independent cell growth and tumor formation. Homodimer. Interacts with MYC. Interacts with PPP2R5C; this interaction stabilizes CIP2A. Interacts with PPP2R1A; this interaction stabilizes CIP2A. Slightly concentrates in the perinuclear region. Highly expressed in 17.5 and 18.5 dpc liver but not expressed in adult liver. Expressed at moderate level in embryonic brain, muscle and epidermal layers. Extended N-terminus.