The breast disease centre of Saint-Louis hospital was set up in the late 70s. It groups all the specialists and nurses involved in mastology together in one and the same place. 12,000 medical consultations are given there every year. In addition to the management of patients, we carry on training and research activities. We have established a university diploma in breast diseases and published a work entitled Le Sein (the Breast), ESKA publishing house, a book of reference in French, covering all mastology fields. Every year, we organize a congress: the Saint Louis Hospital Interactive Mastology Conference. We have set up an all-embracing network of care provision: Saint-Louis breast network (http:www//saint-louis-reseau-sein.org) ensuring alternate monitoring between private practice and hospital and offering supportive care to patients.