Detection of tumor stem cells and tumor cells in epithelial-mesenchymal transition in body fluids of cancer patients
The present invention relates to the detection of tumor stem cells and tumor cells in epithelial-mesenchymal transition and uses of such methods. According to the present invention said method comprises a selecting step for selection or enrichment of said predetermined cells from the sample wherein the sample is contacted with the solid surface for preferential binding of said predetermined cells to the solid surface and then the sample is removed d from the solid surface in a washing step. The inventive method is characterized in that the sample contains a polyol at least during one of contacting the sample with the solid surface and the washing step and in a detection step detecting in said cells, preferentially selected or enriched by said selecting step, the presence or absence of expression of at least one marker associate with at least one the group comprising tumor stem cells and tumor cells in epithelial-mesenchymal transition.
1. A method for solid phase isolation, enrichment and/or detection of tumor stem cells and/or tumor cells in epithelial-mesenchymal transition from a sample of body fluid containing such cells comprising (a) contacting the sample with a solid surface that preferentially binds the cells, and (b) then washing the solid surface, wherein the sample contains a polyol at least during step (a) or step (b), and in an optional detection step, detecting isolated or enriched cells by the expression of at least one marker associated with at least one of the group comprising tumor stern cells and tumor cells in epithelial-mesenchymal transition, wherein the marker is selected from the group consisting of TWIST, ALDH1, BMI1, Akt2, PI3KCA and SIP1.
2. The method according to claim 1 , wherein step (a) comprises an immunological selection of tumor cells.
3. The method according to claim 1 , wherein before or during step (a), a polyol is added to the sample or solid phase.
4. The method according to claim 1 , wherein the polyol is added to the sample or the solid phase or is present in the sample in a final concentration (V/V or WN) selected from least 1%, at least 10%, at least 20%, at least 30%, at least 50% or at least 60%.
5. The method according to claim 1 , wherein the polyol comprises at least one of the group of polyols comprising sorbitol, sucrose, trehalose, mannitol, fructose, malitol, lactitol, xylitol and glycerol.
6. The method according to claim 1 , wherein the solid surface is at least one of a gel surface, a sepharose surface, a glass surface, a latex surface, a ceramics surface, a metal surface and a plastic surface.
7. The method according to claim 1 , wherein the solid surface is the surface of magnetic beads.
8. The method according to claim 1 , wherein ligands or antibodies that specifically bind to the cells are immobilized on the solid surface.
9. The method according to claim 1 , wherein the body fluid is at least one of peripheral blood, bone marrow, urine, ascites, and sputum from a patient.
10. The method of claim 1 , further comprising staging cancer and/or prognosing cancer and/or guiding tumor therapy.
11. The method of claim 1 , further comprising contacting an isolated or enriched tumor stem cell and/or EMT tumor cell with a drug.
12. The method according to claim 1 , wherein during or after step (a), a polyol is added to the solid phase or a washing buffer.
13. The method according to claim 1 , comprising performing the detection step.