二、幼年型慢性粒细胞白血病【临床特征】幼年型慢性粒细胞白血病（juvenilechronicmyelogenousleukemia，JCML）在FAB分类中划入骨髓增生异常综合征（MDS），与CML一样、JCML累及多能造血干细胞，外周血白细胞数增高、脾大、碱性磷酸酶活力减低CML来说尚有以下特征：外周血单核细胞比例＞10%，幼稚细胞比例＜5%；骨髓未成熟单核细胞增高，幼稚细胞比例＜30%；Hb-F升高；高丙种球蛋白血症。
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