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- Title
Expanding the use of monoclonal antibody therapy of cancer by using ionising radiation to upregulate antibody targets.
- Authors
Wattenberg, M M; Kwilas, A R; Gameiro, S R; Dicker, A P; Hodge, J W
- Abstract
Background:Monoclonal antibody (mAb) therapy for the treatment of solid and haematologic malignancies has shown poor response rates as a monotherapy. Furthermore, its use is limited to tumours expressing certain molecular targets. It has been shown that single-dose radiation can induce immunogenic modulation that is characterised by cell-surface phenotypic changes leading to augmented tumour cell/cytotoxic T-cell interaction.Methods:We examined radiation's ability to upregulate mAb therapy targets. We also used radiation to sensitise tumour cells to antibody-dependent cell-mediated cytotoxicity (ADCC).Results:Radiation significantly increased cell-surface and total protein expression of mAb targets HER2, EGFR, and CD20. Focusing on HER2, targeted by trastuzumab, we observed significant upregulation of HER2 following radiation of 3 out of 3 breast cancer cell lines, one of which was triple negative, as well as in residential stem-cell populations. HER2 upregulation was sustained up to 96 h following radiation exposure and was largely dependent on intracellular reactive oxygen species. Improved ADCC and sensitisation to the antiproliferative effects of trastuzumab demonstrated the functional significance of radiation-induced HER2 upregulation.Conclusions:We show that single-dose radiation enhances mAb therapy. These findings highlight a mechanism for combining radiation with immunotherapy and expand the patient population that can be treated with targeted therapy.
- Subjects
CANCER treatment; THERAPEUTIC use of monoclonal antibodies; TARGETED drug delivery; IONIZING radiation; GENETIC regulation; CANCER cells; GENE expression
- Publication
British Journal of Cancer, 2014, Vol 110, Issue 6, p1472
- ISSN
0007-0920
- Publication type
Article
- DOI
10.1038/bjc.2014.79