 Autologous peripheral blood stem cell PBSC transplantation is now considered standard therapy in patients 65 ans with multiple myeloma. The Intergroupe Francophone du Myelome conducted a randomised trial of the treatment of multiple myeloma with high dose chemotherapy followed by either one or two successive autologous stem cell transplantation. The probabilities of event-free-survival and overall survival were doubled with a double transplant. The benefits were greatest among patients who had not had a very good partial response to the first transplant. 