The article discusses the maintenance therapy for multiple myeloma. It states that thalidomide is used as a maintenance therapy for patients with multiple myeloma (MM) which undergo autologous stem-cell transplantation (ASCT). It cites that Lenalidomide is more tolerated by patients than thalidomide after ASCT, but it is more myelotoxic than the latter. It notes that allogeneic stem-cell transplantation (allo-SCT) was already stopped because of its excessive toxicity in MM patients. It also mentions that maintenance treatment is not advisable for elderly patients to improve their overall survival (OS).