In the time between the blood draws, both breast cancer survivors and breast cancer–free women had statistically significant increases in the percentages of granulocytes (1.55% and 2.70%, respectively) and decreases in the percentages of naive CD8+ (−0.43% and −0.35%, respectively) and CD4+ (−0.70% and −1.77%, respectively) T cells and memory B cells (−0.09% and −0.30%, respectively) (eTable 1 in Supplement 1). Here, CD4 is linked to breast cancer.