Ductal breast cancers displayed a higher CD4+ lymphocyte total (18.2 ± 25.3 vs. 11.1 ± 19.4; p = 0.014) and intratumoral infiltration as compared to lobular tumors (12.6 ± 20.3 vs. 6.8 ± 14.1, p = 0.008). The gene discussed is CD4; the disease is breast carcinoma.