• Cancer treatment reports · Mar 1979

    Schedule-dependency assessments of ribonucleoside diphosphate reductase inhibitors when used in combination with platinum compounds plus cyclophosphamide in the treatment of advanced L1210 leukemia.

    • G R Gale, L M Atkins, S J Meischen, and P Schwartz.
    • Cancer Treat Rep. 1979 Mar 1; 63 (3): 449-56.

    AbstractEach of three ribonucleoside diphosphate reductase inhibitors was used as a third drug in combination with selected antitumor platinum (Pt) agents and cyclophosphamide (CY) in the treatment of advanced L1210 leukemia in C57BL/6 x DBA/2 mice. Each was synergistic with the various Pt plus CY combinations but the effect was highly schedule dependent. The collective cure rate was 68% when hydroxyurea (HU) was given as a single injection with Pt plus CY; the cure rate was 15% when HU was administered on a divided-dose schedule with Pt plus CY. The collective cure rate was 53% when guanazole was given as a single injection with Pt plus CY, but was only 8% when it was given on a divided-dose schedule with Pt plus CY. The effect of 4-methyl-5-amino-1-formylisoquinoline thiosemicarbazone, when used as a third drug with the various Pt plus CY regimens, was not schedule dependent as assessed by the collective cure rate. A therapeutic synergy between CY and each of the three ribonucleoside diphosphate reductase inhibitors was also observed.

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