The cultivation of MDA-MB-231 cells with PBMCs activated by hADSCs-IL2 resulted in a significant decrease in the proliferation of cancer cells by 36% (to 63.82 ± 14.1%) (n = 4, p < 0.0001) after 24 h compared to untreated MDA-MB-231 (100.0 ± 4.8%) and MDA-MB-231 incubated with unactivated PBMCs (98.8 ± 8.3%). Here, IL2 is linked to cancer.