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Background and Objective: Cancer can spread to distant parts of the body through the lymphatic system or bloodstream. Angiogenesis is a fundamental step in the transition of tumors from a dormant state to a malignant. Some changes in cancerous cells can be improved and treated using herbal extracts. Salvia species in Iranian traditional medicine were used against various infections, inflammatory diseases.This study was done to evaluate the effect of aqueous extract of Salvia atropatana leaf on subcutaneous tumor model of CT26 colon carcinoma in Mice. Methods: In this experimental study, for the induction of colon carcinoma, 26CT cells were injected into 18 BALB/c male Mice. Subcutaneous injection was done in the right side of the animal. When the size of the tumor was 50±350 mm3, 18 Mice were randomly allocated into 3 groups, including controls, aqueous extracts a breakdown of each dose 50 and 100 mg/kg/bw. The group containing the aqueous extracts of Salvia atropatana leaf was injected for 14 days, daily. To monitor the therapeutic effects, the parameters of the stopping rate in the growth of the tumor, the relative volume changes and the doubling of tumor volume were evaluated. After sacrificed the animals at the end the fourteenth day of the study, tumors were dissected for histological study. Results: The volume of tumors and the mean density of the number of vessels was significantly reduced in treated group 1 (50 mg/kg/bw of aqueous extracts of Salvia atropatana leaf) and treated group 2 (100 mg/kg/bw of aqueous extracts of Salvia atropatana leaf) in compared to control group (P