Whenever CHCS was used prior to, together with, or following MNNG administration, the incidences of gastric cancer and precancerous lesions were significantly increased in comparison with those in the rats treated with MNNG alone.

• 无论在给予MNNG以前、同时或以后饮用Hp培养滤液，大鼠胃癌和癌前病变的发生率均明显增加。