Phase IIb Study Evaluating Immunogenic Chemotherapy Combined With Ipilimumab and Nivolumab in Breast Cancer

There is compelling evidence from animal studies, supported by data from humans, that some chemotherapeutic agents are immunogenic. Doxorubicin and cyclophosphamide have been shown to be particularly powerful inducers of immunogenic cell death. Both agents fulfil 5/5 criteria established for assessing the immunogenicity of different chemotherapeutic drugs. There is also strong evidence from humans, particularly in breast cancer, indicating that the clinical effect of doxorubicin and cyclophosphamide depends on the host immune response. Further, these agents have been shown to induce a Type I interferon immune response in breast cancer. Taken together, there is a strong rationale for synergy between doxorubicin/cyclophosphamide and PD-1/CTLA-4 blockade. The trial combines nivolumab and ipilimumab with established 1st choice chemotherapy in patients with metastatic hormone reseptor positive breast cancer. Nivolumab/ipilimumab (nivo/ipi) may i) potentiate the patient´s spontaneous anti-tumor immune response ii) synergize with chemotherapeutic agents that induce immunological cell death