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Relative tumor weight of Ehrlich solid tumor after treatment with vehicle and P. umbellatum SDE. Relative tumor weight was expressed as tumor weight divided by body weight; groups (n = 8) were treated daily (during 12 days) by oral route with vehicle (PBS, pH 7.0 + Tween 80 0.3%) and SDE 100, 200, and 400 mg/kg; ANOVA, Newman-Keuls Multiple Comparison Test, * P < 0.05, ** P < 0.01 significantly different from negative control group (vehicle).
