PIK3CB and posterior cortical atrophy: Total RNA was purified from the PCa cell lines, and qRT-PCR was conducted to validate the expression level of 11 genes (STAT1, STAT2, ITGB5, PIK3CB, RHOA, RHOU, FGF13, EIF3B, MAPKAPK2, GIT1, and CSNK2A1).