BMI1 and head and neck squamous cell carcinoma: Data mining from Oncomine database indicated marked overexpression of Bmi1 mRNA in HNSCC samples from Toruner’s [31] and Ginos’s [32] patient cohorts, but comparable in HNSCC samples from Cromer’s [33], Kuriakose’s [34] as well as Peng’s [35] cohorts (Fig. 1b, c and data not shown).