MKI67 and head and neck squamous cell carcinoma: An increase in Ki67-positive cells was observed in both the RF-FTMs with AN (*** p < 0.001; Figure 3a,e) and M14 (*** p < 0.001; Figure 3b,f) epidermis compared to that in the PF-FTMs, while such a difference was not profound in the HNSCC FTMs.