PDPN and oral cavity squamous cell carcinoma: Immunohistochemical analysis (with or without antigen retrieval), using LpMab‐21 detected membrane‐associated PDPN expression in the human tumor tissues as follows: glioblastoma (Fig. 5A), oral squamous cell carcinoma (OSCC) (Fig. 5B), and a seminoma (Fig. 5C).