[Potentiation by blastolysin of the effect of cyclophosphamide in preventing recurrence in mouse T-cell leukemia]

Injection of cyclophosphamide in a dose of 100 mg/kg two or four times at 18- or 7-day intervals, respectively, prolonged the remission in EL-4-leukemia-bearing C57Bl/6j mice induced by cytosar under deoxycytidine protection. Injection of blastolysin in a dose of 25 mg/kg once a week at the same period had no effect. However, blastolysin potentiated the antirelapse effect of cyclophosphamide. It is suggested that the potentiation of the cyclophosphamide effect with blastolysin is mediated by activation of antitumor immunological reactivity.