Immunomagnetic enrichment of disseminated tumor cells in bone marrow and blood of breast cancer patients by the Thomsen-Friedenreich-Antigen

Clinical & Experimental Metastasis
Christian SchindlbeckKlaus Friese

Abstract

The presence of disseminated tumor cells in the bone marrow (DTC-BM) of breast cancer patients has shown independent prognostic impact. Immunomagnetic enrichment of such cells is an approach to increase the number of detected cells with limited sample volume, especially for circulating tumor cells (CTCs) in blood. The Thomsen-Friedenreich (TF) antigen (CD 176) is a specific oncofetal carbohydrate epitope (Galbeta1-3GalNAcalpha-O) expressed on the surface of various carcinomas. Own studies demonstrated a nearly complete TF expression on DTC-BM, indicating its suitability as marker for immunomagnetic enrichment. BM samples of 65 and peripheral blood samples of 11 breast cancer patients were examined immunocytochemically by staining with the anti-Cytokeratin antibody A45-B/B3 before and after immunomagnetic enrichment. Enrichment was done by incubation with the primary antibody TF 2 (IgM), followed by secondary magnetically labelled rat-anti mouse IgM. Cytospin slides were screened manually by bright-field microscopy. 15/65 pts (23%) showed DTC-BM in primary screening with a median of 2/2 mio cells (range 1-10). By enrichment, a median of 23.3 mio cells (0.8-218) could be analysed, increasing positivity to 72% (47/65 pts) with a m...Continue Reading

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