Four natural plant products; turmeric, beta-carotene, catechin, and betel leaf extract were tested for their activity against tumors in two animal models of cancer. The first model was mammary (breast) tumor expressing C3H (Jax) mice. These mice had mammary tumor virus from birth. Researchers gave virgin female C3H mice turmeric in their diet and beta-carotene, catechin, and betel leaf extract in their drinking water. This resulted in less frequent tumors and smaller tumor size. Giving 5% turmeric in the diet from 2 months of age stopped activity of the enzyme, mammary tumor virus-related reverse transcriptase, and early tumor-like changes in the mammary glands. Also, feeding turmeric from 6 months of age resulted in a 100% inhibition of mammary tumors. The second animal model was Wistar rats treated with the cancer-producing chemical 7-12-dimethylbenz(a)anthracene (DMBA). In this model giving the four plant products resulted in less frequent tumors and smaller tumor size. It also delayed the start of mammary tumors.
Chemoprevention of mammary tumor virus-induced an.d..[Breast Cancer Res Treat. 1994]
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