Abstract
The effect of the active fraction of Elephantopus scaber L. (Asteraceae) (ES) on skin papillomas induced by 7,12-dimethylbenz(a)anthracene (DMBA) as an initiator and croton oil as promoter was studied in mice. The active fraction of E. scaber (100 mg/kg) on topical application delayed the onset of papilloma formation and reduced the mean number of papillomas and the mean weight of papillomas per mouse. The intraperitoneal administration of the active fraction of E. scaber also had a significant effect on subcutaneous injection of 20-methylcholanthrene (20-MCA)-induced soft tissue sarcomas in mice. It inhibited the incidence of sarcomas and reduced the tumor diameter compared to MCA-treated control animals. The subcutaneous administration of the active fraction of E. scaber significantly inhibited the growth of subcutaneously transplanted DLA and EAC solid tumors, delayed the onset of tumor formation, and increased the life span of tumor bearing mice. The present study thus indicates the tumor inhibitory activity of the active fraction of E. scaber against chemically induced tumors and its ability to inhibit the development of solid tumors.
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