ERBB2 and posterior cortical atrophy: Notably, the Plexin B subfamily forms a multireceptor complex via ectodomain interactions with RTKs such as ErbB2 (HER2/neu), and HGF/scatter factor receptor (MET), both of which have been implicated in PCa progression and metastasis (Solit & Rosen, 2007; Cagnoni & Tamagnone, 2014; Wozney & Antonarakis, 2014).