The successful application of exogenous ribonucleases of different origin to suppress tumor growth allows one to consider them as perspective therapeutics for treatment of oncological diseases. An important aspect of the success of an anti-cancer drug is low hepatotoxicity, which will reduce, if not eliminate entirely the undesirable side effects of treatment. Previously we have shown that ribonuclease from Bacillus intermedius (binase) exhibits high antitumor and antimetastatic activity in tumor models of different histological origin. In this work we studied hepatotoxic action of binase using mouse tumor model of Lewis lung carcinoma. Binase at doses of 0.1-1 mg/kg which produced effective suppression of tumor growth and metastasis, showed positive effect on the liver of tumor-bearing mice expressed in a significant reduction in the volume of destructive changes in the liver parenchyma and return to the normal level of the liver regenerative potential impaired due to endogenous intoxication and tumor burden.
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