title: Circulating tumor cells in metastatic breast cancer: the need for a standardized approach.
authors.affiliation: Department of Medical Oncology, Vall D'Hebron University Hospital, Barcelona, Spain. Electronic address: ldmattos@ir.vhebron.net.
authors.forename: L
authors.initials: L
authors.lastname: De Mattos-Arruda
authors.affiliation: Department of Biostatistics and Epidemiology, National Cancer Institute, Cairo University, Cairo, Egypt.
authors.forename: I
authors.initials: I
authors.lastname: Elattar
authors.affiliation: Department of Medical Oncology, Jules Bordet Institute, Brussels, Belgium.
authors.forename: H A
authors.initials: HA
authors.lastname: Azim