ACTA1 and head and neck squamous cell carcinoma: Analysis of FF samples showed that staining for α‐SMA protein was negative in NHOM (Fig. 2F) and OLP (Fig. 2G), with the exception of pericytes around blood vessels, but positive in 55.3% of intraoral HNSCC and 51.9% of extraoral HNSCC samples (Fig. 2H,I).