Indeed, treatment of cells with an antibody against IL12 prevented the decrease in cell proliferation (Ki67) and increase in apoptosis (CC3) caused by treatment with serum from delirium patients (Time point 1, delirium vs delirium + IL12 antibody; for Ki67, 40.2% vs 62.2%, p < 0.0001; for CC3, 10.2% vs 3.2%, p < 0.0001). Here, MKI67 is linked to delirium.