Unleashing NK- and CD8 T cells by combining monalizumab and trastuzumab for metastatic HER2-positive breast cancer: Results of the MIMOSA trial

Autor: V.C.M. Geurts, L. Voorwerk, S. Balduzzi, R. Salgado, K. Van de Vijver, M.G.J. van Dongen, I. Kemper, I.A.M. Mandjes, M. Heuver, W. Sparreboom, J.B.A.G. Haanen, G.S. Sonke, H.M. Horlings, M. Kok
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Breast, Vol 70, Iss , Pp 76-81 (2023)
Druh dokumentu: article
ISSN: 1532-3080
DOI: 10.1016/j.breast.2023.06.007
Popis: The large majority of patients with HER2-positive metastatic breast cancer (MBC) will eventually develop resistance to anti-HER2 therapy and die of this disease. Despite, relatively high levels of stromal tumor infiltrating lymphocytes (sTILs), PD1-blockade has only shown modest responses. Monalizumab targets the inhibitory immune checkpoint NKG2A, thereby unleashing NK- and CD8 T cells. We hypothesized that monalizumab synergizes with trastuzumab by promoting antibody-dependent cell-mediated cytotoxicity.In the phase II MIMOSA-trial, HER2-positive MBC patients were treated with trastuzumab and 750 mg monalizumab every two weeks. Following a Simon's two-stage design, 11 patients were included in stage I of the trial.Treatment was well tolerated with no dose-limiting toxicities. No objective responses were observed. Therefore, the MIMOSA-trial did not meet its primary endpoint.In summary, despite the strong preclinical rationale, the novel combination of monalizumab and trastuzumab does not induce objective responses in heavily pre-treated HER2-positive MBC patients.
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