Table 1. Incidence of GED.

Group	n	Moderate dysplasia	Severe dysplasia	Incidence of dysplasia
Normal	15	0	0	0.00%
Vehicle	15	4	8	80.0%
XZ-1	15	3	4	46.7%*
Retin-A	15	4	4	53.3%

Rats in the normal, vehicle, XZ-1, and Retin-A group received treatment as described in ‘Materials and methods’ section.

^*P<0.05 compared with Vehicle group.