Table II.

Tumor incidence and the cause of death in the groups of study animals.

Group	Control	MNNG
No. of rats	20	20
No. of death (%)	0 (0)	5 (25)
Cause of death		Gastric cancer (3), small bowel cancer (1), unknown (1)
No. of rats with gastric tumors (%)	0 (0)	18 (90)