The architectural part chosen is developing in two major directions: on the one hand, optimising the operation of the new equipment by a judicious arrangement of the various functional units (accelerators, scanner, day hospital, cytotoxic, staff rooms, reception) by seeking the best orientation, by creating coherent units that are easily identifiable and identifiable. On the other hand, to propose an easily appropriable architecture allowing both to offer pleasant work spaces where vegetation and natural light play an important role and spaces reserved for care where the environment participates in the quality of care.