YAP1 and head and neck squamous cell carcinoma: YAP1 expression was non-significantly associated with HPV status, however, YAP1 expression in SCC-25 and UM-SCC-47 cell lines was higher than in the other HNSCC cell lines and YAP1 expression in 93-VU-147T cell line was lowest in the HNSCC cell lines tested.