METHODS 21 cases of neuroblastoma were treated by preoperative chemotherapy.The urine VMA, DNA image analysis and MYCN gene were studied.

• 方法对照研究应用术前化疗后切除的成神经细胞瘤21例，观察尿香草扁桃酸（VMA）、DNA图象分析和MYCN基因变化。