To investigate the role of APOC1P1-3, we compared its expression profiles in cultured cells (MCF10A versus BT549, MCF7, MDA-MB-231, MDA-MB-453, MDA-MB-468, MCF7/Adr, and T47D) and 25 pairs fresh tissues (cancer versus matched normal tissues) with qPCR. Here, APOC1P1 is linked to cancer.