The suppressor activity of the splenic cells in the cyclophosphamide (CP)-treated BALB/c mice with transplanted tumours was studied. CP was injected according to three different therapeutic effective schedules. The analysis of non-specific and antigen-specific tumour-associated suppressor activity in the splenic cell adoptive transfer system demonstrated that CP immunomodulating influence depends on the injection schedule. Usage of the most therapeutically effective CP injection schedule ensured a relative safety of the nonspecific tumour-associated suppressor activity and depression of the specific one.
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