[Induction of the antileukemic activity in nonimmune allogeneic splenocytes using spleen hemoregulators]

The leukemic mice treated with cyclophosphamide were injected twice a week with the allogenic splenocytes treated for 4 h with the substance isolated from the calf spleen. The leukemia growth inhibition was observed. Syngenic splenocytes were inactive. Allogenic but not syngenic splenocytes manifested a certain antileukemic activity observed in the Winn neutralization and 51Cr release tests, however this activity did not correlate quantitatively with more pronounced antileukemic action of cells in vivo.