ERBB2 and neoplasm: Technical advances in cellular engineering may help overcome some of these challenges, for example a recent preclinical study has shown that trivalent CAR-T cells targeting commonly expressed glioma antigens including HER-2, IL13Rα2 and Eph-A2 can overcome tumour heterogeneity and target nearly all tumour cells in patient-derived xenograft models compared to bispecific or single-epitope targeting CARs [108].