However, the interaction found between CD8+CD57+ILT2+PD-1+ T-cell frequency and brain-PAD when predicting disability, suggests that in MS patients with a poorer brain health than expected for their age, CD8+CD57+ILT2+PD-1+ T-cell frequency may play a role in the development of physical disability. The gene discussed is CD8A; the disease is myeloid sarcoma.