On the eve of the World Cancer Day, IRSN organised in partnership with CEA, Inserm and CNRS(1), a conference dedicated to the contribution of research on the use of ionising radiation to the fight against cancer. This venue organised under the auspices of Marie-France Bellin and Jean-Christophe Niel, respectively chair of the board and director general at IRSN, took place at Maison Irène et Frédéric Joliot Curie, the Brussels base of several major French research institutions.