Presentation of the exhibition. Participants: Giancarlo Cesana, Professor of General and Applied Hygiene at the Università degli Studi, Milan Bicocca; Sylvie Menard, Consultant Experimental Oncological Center, Istituto Nazionale dei Tumori, Milan. Introduced by Paola Marenco, Director of the Bone-Marrow Transplant Center, A. O. Niguarda, Milan.