OncoQuick® is a simple-to-use, rapid and efficient system for the enrichment of circulating tumour cells that are released into the blood by a solid epithelial tumour or malignant melanoma. OncoQuick® combines the advantages of cell separation by density gradient centrifugation (rapid, reproducible and costeffective) with recovery rates that are comparable with immunobead methods. OncoQuick® consists of a sterile 50 ml polypropylene tube with a porous barrier which is inserted above the specially developed separation medium. Up to 30 ml of anticoagulated whole blood is directly filled into the OncoQuick® tube and centrifugated. Apart from erythrocytes and granulocytes, the separation medium also allows the elimination of lymphocytes and mononuclear cells to a wide extent. The disseminated tumour cells are enriched in the interphase. After harvesting, the enriched cell fraction is washed. The tumour cells are then available for all standard research methods. OncoQuick® was developed in a cooperation between Hexal Gentech and Greiner Bio-One and is intended for use for research purposes only!