难治性急性髓细胞性白血病（AML）通常是指：（）应用标准诱导方案2疗程不能缓解者；（2）第一次完全缓解（CR）后6个月内复发；（）第一次CR后6个月以上复发（晚期复发），但对达到CR的原诱导方案无效；以几次以上复发者「‘j。大多数AML患者最终复发或达到难治性AML的标准， Refractory acute myeloid leukemia (AML) usually refers to: () 2 patients who cannot remission with standard induction regimen 2; (2) relapse within 6 months after the first complete remission (CR); () first time More than 6 months after CR recurrence (late recurrence), but the original induction program to achieve CR is ineffective; relapsed more than a few times. ’j. Most AML patients eventually relapse or meet refractory AML criteria,