[Action of carminomycin on leukemic cell proliferation and some problems of its use in the combined therapy of leukemias].

The effect of carminomycin on the mitotic cycle of the cells of the transplantable leukemia L-1210 and the therapeutic activity of other antitumor drugs, such as phopurine and cyclophosphane was studied on mice BDF1. It was found that the cells in phases S and G2 of the mitotic cycle were most sensitive to carminomycin. Transfer G1--S and phase G1 were characterized by resistance to the antibiotic effect. When carminomycin was used in combination with phopurine or cyclophosphane, clear dependence of the therapeutic efficacy on the treatment scheme was noted. Simultaneous administration of all the three drugs resulted in potentiation of the antileukemic effect. An analogous effect was observed when carminomycin was administered prior to phopurine or cyclophosphane. When the order of the drugs use was reverse, the efficacy of the combined therapy was significantly lower than the summation antileukemic effect of the drugs.