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Background: Natural products, those extracted from invertebrate animals have medical importance as therapeutic agents especially for cancer treatment. Aim of the Work: The current study was conducted to evaluate the antitumor effect of the hemolymph of the desert snail, Helix desertorum (HD-H) on tumor Ehrlich ascetic carcinoma cells (EAC) cell line in vitro and in vivo. Materials and Methods: Helix desertorum (HD-H) was collected from their suitable habitats, identified, and then their hemolymph was collected, to evaluate their antitumor effect. 40 female albino mice were divided into five groups (n=8) as the following: group 1 (Gp1) control mice were inoculated intraperitoneal (i.p) with 1x106 EAC cells/mouseat day 0, Gp2 (EAC/Cis): Mice were injected with EAC-cells as in Gp1 and at day 2 were injected with cisplatin (40 mg/Kg), Gp3 was inoculated with EAC and then treated with splenocytes activated with HD-H, Gp4was inoculated with EAC and then treated with splenocytes activated with IL-2/Con A, and Gp5 was inoculated with EAC and then treated with splenocytes without activation. All groups were sacrificed to evaluate the tumor profile, hematological and biochemical. Results: The results showed that treatment with HD-H led to decrease tumor volume, their cell counts, increase the percentage of the apoptotic cells and arresting the cancer cell cycle. Moreover, treatment with HD-H improved the hematological and biochemical parameters on tumor-bearing mice. Conclusion: In conclusion, HD-H has potential in vitro and in vivo antitumor effects against EAC-cells. Further study is recommended to evaluate the potential efficacy of HD-H as a potential anticancer

Thesis Abstract Background: Although anticancer chemotherapy is effective, it has side effects. Novel agents with potent anti tumor effects are needed, potential source could be extracted from marine animals since they possess products with anticancer effect. Aim: the aim of this study was to study the potential anti tumor effect of egg extract and purple fluid in vitro . EAC cells were incubated with different concentrations of both extracts in vitro for 24 hours and then cell cycle, apoptosis were analyzed by flow cytometry and survival was analyzed by trypan blue exclusion and MTT assays. Incubation of EAC cells with both extracts resulting in significant decreasing in number of cells and increasing in apoptosis in a dose dependant manner. Untreated cells were negative control, cells treated with cisplatin were positive control. Results: Egg extract at (50 µg/ml , 100 µg/ml , 150 µg/ml , 200 µg/ml , 250 µg/ml ) induced ( 68% , 60% , 55% , 48% , 42% ) respectively in proliferation , and (6.3% , 6.4% , 7% , 7.1% , 7.2% ) increases in apopptosis. Purple fluid at (0.5 µg/ml , 1 µg/ml , 1.5 µg/ml , 2 µg/ml ) induced ( 55% , 50% , 45% , 35% ) respectively in proliferation , and (5% , 7.1% , 7.2% , 11.5%) increases in apopptosis. Conclusion: both egg extract and purple fluid showed significant anti tumor effectacy which, further studies required to evaluate the potential efficacy.