After the Id1-RNAi-LV construct was transfected into EPCs of 6 patients with ovarian cancer, Id1 mRNA expression levels in transfected cells were compared to those in nontransfected and control-transfected (NC-GFP-LV) EPCs of 6 patients with ovarian cancer by quantitative RT-PCR. The gene discussed is ID1; the disease is ovarian carcinoma.