No significant differences in immune cell proportions between HD and untreated patientsPreviously treated patients had ^monocytes v CD4+ T cell and pDCNo significant differences between currently treated and previously treated patients, other than current patients having lower lymphocyte countsCDK inhibitors v neutrophilsBC patients receiving treatments had higher MDSC to T cells ratioT cells from BC patients exhibit activated/exhausted phenotype. Here, CD4 is linked to breast cancer.