 Thalidomide has already been used as maintenance andor consolidation after high-dose therapy followed by autologous stem cell transplantation. Despite a number of phase II and III studies the issues of right dose and duration of thalidomide and subsets of patients benefiting from it have not yet been settled We explored the maintenance therapy after thalidomide, dexamethasone and pegylated liposomal doxorubicin called ThaDD protocol. Patients with de novo or relapsed MM obtaining at least minor response after 4 to 6 ThaDD courses, were randomized to receive standard maintenance therapy with IFN 3 MU 3 times a week or an experimental maintenance therapy such as thalidomide 100 mg per day until relapse or intolerable side effects. Both groups also received pulsed dexamethasone 20 mg 4 days a month. 