Only three out of thirteen (23.1%) luminal A neoplasms presented a high infiltration of intratumoral TCD3+ lymphocytes, while luminal B HER-2 negative or HER-2 positive presented a higher percentage of neoplasms with a high density of this cell type, which were 23/42 (54.8%) and 5/6 (83.3%), respectively. The gene discussed is ERBB2; the disease is neoplasm.