Abstract
Aim: Despite therapy, approximately half of patients with metastatic breast cancer develop a malignant pleural effusion (MPE) associated with short survival. Hence, new treatment strategies are urgently needed. In the present study, the efficacy of the bispecific single-chain antibody MT110 targeting both the epithelial antigen EpCAM (CD326) and the T cell antigen CD3 was investigated ex vivo with MPE samples of breast cancer patients. Methods: Target antigen expression of MPE cells was analyzed by immunohistochemistry (ABC-method on cytospins, FACS). Percentage of redirected target cell lysis by MT110 was determined by double staining of cells with 7-amino actinomycin (7-AAD) and an anti-EpCAM antibody using FACS analysis. Activation of autologous CD4+ and CD8+ cells in response to MT110 was studied by the expression of CD25, granzyme B and different cytokines i. e. IL-2, IL-4, IL-6, IL-10, TNF-α and IFN-γ (FACS). Results: EpCAM+ cells were found in 14 out of 18 (78 %) MPE samples from metastatic breast cancer patients. The fraction of EpCAM+ pleural carcinoma cells varied between 30 % and 100 % (mean 78 %). CD3-positive cells were detected in all MPE samples ranging from 60 % to 93 % (mean 80 %). Seven effusion samples were analyzed for MT110 treatment and revealed a dose-dependent and specific redirected lysis of EpCAM+ cells after 48 h and 72 h with 10 ng/ml (48 h, 72 h: p = 0.03) and 1000 ng/ml (48 h, p = 0.03; 72 h, p = 0.016). After 72 h, 57 % ± 29.5 % (mean ± SD) of EpCAM+ cells were killed using 1000 MT110. Antibody treatment (1000 ng/ml) increased the fraction of CD25/CD4 cells after 48 h (p = 0.03) and 72 h (p = 0.016). Similar, CD25 expression on CD8 cells was stimulated after 48 h (p = 0.03) and 72 h (p = 0.016) using 1000 ng/ml MT110. Cytokine analysis revealed a strong TH1 immune response detecting an increased TNF-α (p = 0.016) and INF-γ (p = 0.03) secretion. Conclusion: Single-agent treatment with MT110 is capable of activating unstimulated autologous T cells for efficient and specific redirected lysis of EpCAM+ tumor cells in MPE from breast cancer patients. Future clinical studies are warranted to investigate the efficacy of bispecific antibody MT110 in metastatic breast cancer patients.
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Literatur
Witthauer J, Schlereth B, Brischwein K, Jauch K-W, Baeuerle PA, Mayer B. Lysis of Cancer Cells by Autologous T Cells in Breast Cancer Pleural Effusates Treated with Anti-EpCAM BiTE Antibody MT110; Publikation in Vorbereitung
Brischwein K, Parr L, Pflanz S, Volkland J, Lumsden J, Klinger M, Locher M, Hammond SA, Kiener P, Kufer P, Schlereth B, Baeuerle PA (2007) Strictly target cell-dependent activation of T cells by bispecific single-chain antibody constructs of the BiTE class. J Immunother 30(8): 798–807
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© 2008 Springer Medizin Verlag Heidelberg
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Witthauer, J. et al. (2008). Ex vivo Therapie maligner Pleuraergüsse beim metastasierten Mammakarzinom mit dem bispezifischen anti EpCAM/CD3 Antikörper MT110. In: Arbogast, R., Schackert, H.K., Bauer, H. (eds) Chirurgisches Forum 2008. Deutsche Gesellschaft für Chirurgie, vol 37. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-78833-1_47
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DOI: https://doi.org/10.1007/978-3-540-78833-1_47
Publisher Name: Springer, Berlin, Heidelberg
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