Methods:Messenger RNA expressions of nm23-H1 and nm23-H2 genewere investigated in 12 cases of human bladder transitional cell tumor and 6 cases of human normalbladder tissue by using the Northern blot techniques.

• 方法：应用Northernblot技术分析12例膀胱移行细胞癌和6例肉眼未见异常的癌旁膀胱粘膜nm23-H1和nm23-H2基因的表达。