We found no significant (p>0.05) association between the in situ levels of Bmi1 and tumor type (adenocarcinoma, squamous cell carcinoma, and large cell carcinoma), tumor size (categorized as ≤2 cm, >2 to ≤3 cm, >3 to ≤5 cm, >5 to ≤7 cm, and >7 cm), smoking status (never smoker, if the patient had smoked less than 100 cigarettes during life time; former smoker, if the patient had quit for at least 1 year; and current smoker, for all others), and sex (Table 1). Here, BMI1 is linked to squamous cell carcinoma.