P4HA1 and head and neck squamous cell carcinoma: In HNSCC, P4HA1 co‐expressed genes were enriched in the HIF‐1 signaling pathway, focal adhesion, regulation of actin cytoskeleton, protein processing in endoplasmic reticulum, vibrio cholera infection, lysosome, lysine degradation, glycolysis/gluconeogenesis, and other types of O‐glycan biosynthesis (Figure7).