ERBB2 and cancer: It is important that in contrast to TAAs (tumor-associated antigens) such as HER2, MART-1, MUC1, and CGAs (cancer germline antigens or CTAs—cancer/testis antigens) such as MAGE (melanoma-associated antigen), NY-ESO-1 (cancer/testis antigen 1) [32,33,34], which can be expressed at low levels in a variety of healthy tissues, neoantigens are specific to tumors only.