Antibodies inhibited the 3D growth of human HER-2+++ and HER-2++ breast cancer cells, of trastuzumab resistant cells and of gastric carcinoma cells. Vaccination increased interferon-gamma secreting cells in the spleen, as evaluated by ELISPot (21±3 spots/2x105 cells). The results warrant further development of ES2B-C001 for the therapy of HER-2 positive human breast cancer and of other tumors expressing HER-2.
Antibodies inhibited the 3D growth of human HER-2 trastuzumab-sensitive and -resistant breast cancer cells. ES2B-C001 is a promising candidate vaccine for the therapy of tumors expressing HER-2. Preclinical results warrant further development towards human clinical studies.