Provided is an anti-IgE/M1' antibody that specifically binds an epitope in the M1' segment of IgE defined by residues 317 to 352 of SEQ ID NO:1 and which induces apoptosis in IgE-expressing B-cells. Further provided are deposited murine hybridomas expressing such antibodies, methods of antibody production and use of the antibodies against IgE mediated disorders, including allergies, asthma and IgE myeloma.