Abstract
Tumor stroma contains much fibrin and monoclonal antifibrin antibody targeting is possible in tumors. In this study, nude mouse human ovarian carcinoma xenograft specimens were investigated after treatment with90Y-labeled monoclonal antifibrin antibody Fab fragment or with90Y-labeled OC125-monoclonal antibody F(ab′)2 fragments. The mice received the radioimmunotherapy activity either intratumorally, intraperitoneally, or intravenously. Beta-camera imaging (BCI) is a novel device for studying activity distribution in tissue specimens and, together with immunohistochemistry (IHC) with OC125, antifibrin, anticarcinoembryonic antigen, anti-cytokeratin, and anti-placental alkaline phosphatase antibodies, was used for correlation of activity distribution of tissue specimens. These results were in concordance: Antigen distribution measured with IHC and radioactivity distribution were similar with the same antibodies, antifibrin, and OC125: However, these antigens demonstrated rather different distribution. Tissue studies revealed that activity was concentrated also in the necrotic tumor tissue, indicating that cell death was also caused by radiation. Differences in the tumor cell morphology were observed using different routes of administration. With BCI, it is possible to quantitate activities in frozen sections (microdosimetry), and these results were in concordance with absolute activities as measured by tissue sampling and well-counting. Three-dimensional reconstruction of tissue slices combined with radioactivity distribution measured with BCI allows estimation of total absorbed radiation dose in tumor after an appropriate dose planning.
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Kairemo, K.J.A., Ljunggren, K., Wahlström, T. et al. Correlation of beta-camera imaging and immunohistochemistry in radioimmunotherapy using90Y-labeled monoclonal antibodies in ovarian cancer animal models. Cell Biophysics 24, 293–300 (1994). https://doi.org/10.1007/BF02789240
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DOI: https://doi.org/10.1007/BF02789240