The methanol extract of Capparis Sepiaria (Capparaceae) bark (MECS) were evaluated for antitumor activity against Ehrlich ascites carcinoma (EAC)-bearing Swiss albino mice. The extract was administered at the doses of 200, and 400 mg/kg body weight per day for 14 days after 24 h of tumor inoculation. After the last dose and 18 h fasting, the mice were sacrificed. The present study deals with the effect of MECS on the growth of transplantable murine tumor, life span of EAC-bearing hosts and hematological profile MECS caused significant (P < 0.01) decrease in tumor volume, packed cell volume, and viable cell count; and it prolonged the life span of EAC-tumor bearing mice. Hematological profile converted to more or less normal levels in extract-treated mice. The results indicate that MECS exhibited significant antitumor activity in EAC-bearing mice.