In PVL-OSCC group, CD56 expression was seen in the malignant epithelial cells forming neoplastic chords and islands, as well as in cells in the connective tissue between the neoplastic epithelial islands (Figure 4B), with 8/10 PVL-OSCC cases presenting a final score ≥ 6 (Figure 2C, Table S2). The gene discussed is NCAM1; the disease is periventricular leukomalacia.