- The IVAC® WAREHOUSE concept is based on RNA drug products shelved in a warehouse and targeting shared tumour-associated antigens (TAAs). The BioNTech Group (henceforward the "company") has identified a set of target antigens commonly expressed in TNBC. The selected breast cancer-associated antigens have been shown by immunogenicity testing to constitute suitable targets for immunotherapy and form the basis for the development of a novel RNA-based immunotherapy approach.