Multiple myeloma is an incurable malignant disease which evnetuelly will relapse after primary treatment. Clonal B-cells have been identified and in theory these cells might be sleeping during primary treatment and be responsible for later relapse. Fluarabine has documented effect on both resting and dividing cells including B-cells. The protocol aim at evaluating safety and toxicity of adding fludarabine to induction chemotherapy with cyclophosphamide and dexamethasone before high-dose melphalan with autologous stem cell support.