CD8A and breast cancer: The contents of B cell plasma, B cell, cancer-associated fibroblast, class-switched memory B cell, endothelial cell, hematopoietic cell, macrophage M0/1/2, activated NK cell, CD8+ T cell, T cell follicular helper, and Treg populations were significantly correlated with the survival possibility of patients, indicating that the above-mentioned immune cells exerted pivotal roles in TME remodeling and in the prognosis of BC.