Growth curves of CNE-2 and C666-1 cell lines treated with lentivirus mediated RNAi. The cell growths were assessed by MTT method. Each value represents the mean ± SD of absorbance value (OD) for cells. CNE-2/GFP+/Cripto-1- cells (a) and C666-1/GFP+/Cripto-1- cells (b) exhibited a slower growth rate than that of the control cells. (p < 0.01, respectively).