TGFB1 and head and neck squamous cell carcinoma: Differences could be observed in immune subtypes between HNSCC and LUSC; LUSC was enriched in IS1 (intermediate immune infiltrate, high M2‐macrophage polarization and biased to humoral immunity) and IS5 (high inflammation, reactive stroma and TGF‐β, indicating immune hot/suppressed TME).