PRKCE and head and neck squamous cell carcinoma: Bao et al. [4] demonstrated the efficiency and selectivity of a HN1-PKCε combined peptide in HNSCC cells in vitro, with a series of different FITC-labeled peptides (peptides at 3 μmol/L, incubated 24–48 hours) followed by fluorescence-activated cell sorting (FACS) analysis.