ERBB2 and breast carcinoma: In another study, Arab et al. developed an effective vaccine delivery system by incorporating the epitope E7, derived from the highly expressed antigen HER-2 in breast cancer patients to the surface of liposomes containing distearoyl phosphatidylcholine (DSPC) and distearoyl phosphatidylglycerol (DSPG) to enhance antitumor activity.