Satoshi Iyama1, K Takada2,3, M Yoshida3, D Takahashi4, M Kobune2. 1. Department of Hematology, Sapporo Medical University School of Medicine, South-1, West-16, Chuo-ku, Sapporo, 060-8543, Japan. iyama@sapmed.ac.jp. 2. Department of Hematology, Sapporo Medical University School of Medicine, South-1, West-16, Chuo-ku, Sapporo, 060-8543, Japan. 3. Department of Medical Oncology, Sapporo Medical University School of Medicine, Sapporo, Japan. 4. Research and Development Department, Central Blood Institute, Blood Service Headquarters, Japanese Red Cross Society, Tokyo, Japan.