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A set of Thai folkloric remedy consists of five species of medicinal plants i.e. Ludwigia hyssopifolia (G. Don) Ewell., Polygala chinensis Linn., Canna indica Linn., Smilax carbularia Kunth C., and Climacanthus siamensis Brem., and five medicinal animals. This remedy was claimed to be more effective in the treatment of patients with mammary tumors. The hormone-dependent mammary tumor induced by 7,12-DMBA was used for testing anticancer activity of the plant extract of this remedy. This mammary tumor in rats is closely parallel to its human counterpart. Female Wistar rats fed 130 mg/kg DMBA singly developed mammary tumors 30.67% (73 out of 238 survival rats) which classified by their histology to 7 subdivisions. The appearing rates were adenocarcinoma 69.9%, fibroadenoma12.3%, carcinosarcoma 8.2%, adenocarcinoma with squamus cell metaplasia 6.8%, fibroma 4.1%, intraductal papillomatosis 1.4% and adenosis 1.4%. Treatment in 37 malignant mammary tumor bearing rats by daily dose of 1,000 mg/kg the plant extract can increase survival rate (P = 0.041) and prolong survival time (P = 0.025) significantly comparing to the solvent control group.
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