Further immunohistochemical staining showed that the tumor cells were positive for CD21 (Fig. 3c, f), CD23, CD35, CXCL-13, focally positive for D2-40, and negative for CD3, CD20, CD30, CD15, ALK1, PLAP, CD117, CD38 and EGFR. Here, PDPN is linked to neoplasm.