CD8A and hematoma: Notably, we detected a marked decrease in B cells within the hematoma (peripheral blood control vs. peripheral blood ICH vs. hematoma ICH: 21.5% vs. 12.0% vs. 4.1%), accompanied by an increase in T cells (peripheral blood vs. peripheral blood ICH vs. hematoma ICH: 29.1% vs. 46.1% vs. 56.1%), which resulted from mainly CD8+ T cells (peripheral blood vs. hematoma ICH: 17.2% vs. 37.2% vs. 43.1%) (Fig. 1G).