目前，儿童白血病在很大程度上是一种可以治疗的疾病。临床工作者已开始考虑治疗方法的副作用问题，特别是那些为了清除神经系统中残存白血病细胞的治疗方法．在一些罕见的疾病中，评价一个治疗方法需要进行多元随机试验和认真的随访，英国医学会白血病小组最近报道了有关这类 At present, childhood leukemia is largely a treatable disease. Clinicians have begun to consider the side effects of treatment methods, especially those that eliminate leukemia cells in the nervous system. In some rare diseases, evaluating a treatment requires multiple randomized trials and careful follow-ups. The British Medical Association Leukemia Group recently reported this type of