Table 1.

Histopathology score of lung tissue after 15 weeks of treatment.

Group	Histology characteristic	Stage of carcinogenesis	n	Score (Mean ± SEM)
Control	Normal	No	6	0
Vehicle	Normal	No	6	0
Cancer	Hyperplasia, Metaplasia, and Dysplasia	Early and Intermediate	6	2.00 ± 0.29*

*Significant difference (P < 0.05) between cancer with vehicle and control groups.