Based on limited published evidence, PCDHGB4 is a calcium-dependent cell-adhesion protein potentially involved in establishing and maintaining neuronal connections. UniProt annotations indicate roles in cell adhesion and calcium-dependent cell-cell adhesion at the plasma membrane. In cancer contexts, PCDHGB4 has been identified as a passenger gene in endometrial cancer 1 and shows altered expression in lung squamous cell carcinoma with associations to immune cell infiltration and tumor immunity pathways 2. However, direct functional studies of PCDHGB4 remain limited.