1 University Cancer Center Hamburg, Department of Tumour Biology, Center of Experimental Medicine, University Medical Centre Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany.
2 University Medical Center of Montpellier, Laboratory of Rare Human Circulating Cells, Department of Cellular and Tissue Biopathology of Tumors, 641, Avenue du Doyen Gaston Giraud, 34093 Montpellier Cedex 5, France; and at the University of Montpellier Unit EA2415 - Help for Personalized Decision: Methodological Aspects, University Institute of Clinical Research (IURC), Montpellier, France.