The present invention relates to a Robo1-Fc recombinant protein and to the use thereof for treating diseases in which a Slit protein is overexpressed, in particular cancer. The invention also relates to a composition including such a recombinant protein. Another aspect of the invention involves using a Robo1-Fc molecule as a diagnostic tool for detecting the overexpression of a molecule belonging to the Slit family in a patient.
