PROBLEM TO BE SOLVED: To provide methods of treating, preventing or managing hematologic disorders, such as leukemia.SOLUTION: The treatment methods use (+)-1,4-dihydro-7-[(3s,4s)-3-methoxy-4-(methylamino)-1-pyrrolidinyl]-4-oxo-1-(2-thiazolyl)-1,8-naphthyridine-3-carboxylic acid (SNS-595) represented by the formula in the figure together with chemotherapy, radiation therapy, hormonal therapy, biological therapy or immunotherapy. Preferably, it is administered in combination with cytarabine (Ara-C).SELECTED DRAWING: Figure 1【課題】白血病などの血液学的障害の治療方法、予防方法又は管理方法の提供。【解決手段】下記式で表される(+)-1,4-ジヒドロ-7-[(3S,4S)-3-メトキシ-4-(メチルアミノ)-1-ピロリジニル]-4-オキソ-1-(2-チアゾリル)-1,8-ナフチリジン-3-カルボン酸(SNS-595)を、化学療法、放射線療法、ホルモン療法、生物学的療法、又は免疫療法と共に使用する治療方法。好ましくは、シタラビン(Ara-C)と組合せて投与する方法。【選択図】図1