We have shown that glucosaminyl muramyl dipeptide (GMDP) has been augmented the antitumor action of chemotherapy drug cisplatin and tumor necrosis factor-α (TNFα) on the Ehrlich ascites carcinoma and melanoma B-16 mouse tumor models. The doses of cisplatin, TNFα and GMDP and also the conditions of the drugs combination injection provided 100% survival of mice with Ehrlich ascites carcinoma were found. Furthermore, it was shown first that GMDP has been decreased toxicity of the cisplatin/TNFα combination and normalized the changes in the experimental mice hematological parameters which were produced by the CP/TNFα combination. © 2009 Elsevier Masson SAS.