The present invention relates to compositions comprising multifunctional agents. More specifically, the present invention provides compositions comprising multifunctional chrolotoxin polypeptide conjugates. Methods for synthesizing such multifunctional agents are also provided.Linvention concerne des compositions comprenant des agents multifonctions. Linvention concerne plus spécifiquement des compositions comprenant des conjugués de polypeptide-chrolotoxine multifonctions. Linvention concerne des procédés de synthèse de ces agents multifonctions.