In the present investigation, elevated CD19+ CD24+ CD38+ regulatory B cells (Bregs) were observed in PBMCs of invasive carcinoma of breast (IBCa) patients compared with that in patients with fibroadenoma (FIBma) or healthy individuals, and the positive correlation existed between Bregs and CD4+ CD25+ CD127− Tregs (r = 0.316, P = 0.001). The gene discussed is CD4; the disease is Fibroadenoma.