ERBB2 and breast cancer: As shown in Fig 5B and 5D, effector T cells (HLA A2+ from Patient 1 or Patient 2) stimulated with HSP70.PC-Fc lysed the autologous breast cancer cells (HLA A2+) and to a lesser extent, the MCF7 breast tumor cells (HLA A2+, MUC1+, HER2+).