ERBB2 and breast cancer: Specific CAR-macrophages (CAR-Ms) can exert antitumor effects in solid tumors, such as in the HER2-positive ovarian cancer cell line, SKOV3, GD2-expressing neuroblastoma, and GD2-expressing melanomas (155–157).Thus, CAR-NK cells, CAR-M, and CAR-MSCs are beneficial for breast cancer treatment.