To enhance their therapeutic efficacy, NK-92 cells have been modified to express chimeric antigen receptors against different cancer targets, such as CD20 for lymphoma and leukemia [13], CD19 for chronic lymphocytic leukemia (CLL) [14], GD2 for neuroblastoma [15], EpCAM for breast carcinoma [16], Her2 for breast carcinoma and glioblastoma [17, 18], CS1 and CD138 for multiple myeloma [19, 20], EGFR for glioblastoma [21, 22], and CD3 or CD5 for T cell malignancies [23, 24]. The gene discussed is ERBB2; the disease is breast carcinoma.