pNE-mIL-12 and pcDNA-B7-1 plasmids were injected locally three times following with irradiation three times. The tumor growth rate of mice was observed.

• 肿瘤局部注射pNE-mIL-12和pcDNA-B7-1质粒3次,并给予3次X线照射,观察小鼠移植肿瘤的生长情况。