Antitumor effect of paclitaxel used as the monotherapy or in combination with cyclophosphamide was studied on CBA/LacSto mice with transplanted LS and RLS tumors characterized by high (LS) and low (RLS) sensitivity to cyclophosphamide. The therapeutic effects of cyclophosphamide and paclitaxel were summed in animals with drug-resistant RLS tumor, while combined use of these drugs in LS tumor highly sensitive to the apoptogenic effect of cyclophosphamide was no more effective than cyclophosphamide alone.

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