 He later showed that stem cells could not only heal radiation damage, but also fight cancer.He also demonstrated the positive role of BCG combined with irradiated tumoral cells.Georges Mathé took over the Hematology Department of the Institut Gustave Roussy in Villejuif in 1961 and created the Institut de Cancérologie et d’Immuno-génétique in 1964 where he created the first sterile hospital rooms.