The present invention relates to a conjugated compound comprising a marker M pharmaceutically acceptable, and a peptide or pseudo-peptide P having at most 30 amino acid residues and able to bind the Low-Density Lipoprotein Receptor (LDLR) and to its use in a method of labelling and/or detecting and/or treating cancerous cells in a subject by administration of the conjugated compound to the subject an analysis of the presence and/or the amount of marker.
