BMI1 and dysplasia: Immunoreactivity for Bmi-1 was least intense for normal (median score = 1.7; IQR = 1–4) and mild dysplasia tissues (median score = 1; IQR = 0–2), higher for moderate-severe dysplasia (median score = 2.86; IQR = 2.33–4), and highest for OSCC tissues (median score = 4; IQR = 1–6.86), however, the intragroup range of immunoreactivity index scores mask any trend between Bmi-1 staining and disease severity.