The function of SAPCD2 (suppressor APC domain containing 2, ENSG00000186193) is as follows. Plays a role in planar mitotic spindle orientation in retinal progenitor cells (RPCs) and promotes the production of symmetric terminal divisions (By similarity). Negatively regulates the mitotic apical cortex localization of GPSM2 (PubMed:26766442). Involved also in positive regulation of cell proliferation and tumor cell growth (PubMed:23576022, PubMed:23704824). {ECO:0000250|UniProtKB:Q9D818, ECO:0000269|PubMed:23576022, ECO:0000269|PubMed:23704824, ECO:0000269|PubMed:26766442}.