Arm І: Patients receive thalidomide with a dosage of 25 mg at bedtime daily one week (days 1-7), then 50 mg at bedtime daily for one week (days 8-14), then 75 mg at bedtime daily for one week (days 15-21), then 100 mg at bedtime daily for 12 weeks (days 22-105), in the absence of unacceptable toxicity or severe deterioration.