EPCAM and neoplasm: As shown in Fig. 8A and 8B, the tumor sizes of control MDA-MB-231 cells were 8389 ± 968 mm3, which were significantly larger than the tumor sizes of xenografts derived from si-EpCAM-transfected MDA-MB-231 cells (3240 ± 846 mm3, P < 0.01).