When the mice had a tumor of 80 mm3, the tumor-bearing mice were treated 6 times in every 3 days with saline, naked siSUR, PEI1.8ksiSUR, PCPPsiN.C (siRNA of nonsense sequences), and PCPPsiSUR (siRNA of anti-Survivin gene) at a dose of 1 mg/kg (siRNA). The gene discussed is BIRC5; the disease is neoplasm.