HOXB9 and head and neck squamous cell carcinoma: In normal tissues, expression of HOXB9 was expressed at low levels, confined to the nuclei of the basal and spinous layers (Fig 3C Panel 1 and 2), whilst in HNSCC the nuclear intensity increased, with a greater proportion of cells in tumour nests expressing HOXB9 (Fig 3C Panel 3 and 4).