TNC and head and neck squamous cell carcinoma: Tenascin-C was detected at 266 kDa in EVs from the HPV-positive HNSCC lines, UM-SCC-47, UM-SCC-104, UM-SCC-105, and UPCI:SCC152, and at incredibly high levels in EVs from the HPV-negative cell line UM-SCC-118a.