EPCAM and neoplasm: While ALDH+/EpCAM+ cells expressing scramble shRNA (PS1-ALDH+/Scrsh) rapidly formed large tumours in vivo, ALDH+/EpCAM+ cells expressing ABshRNA-1 (PS1-ALDH+ /ABsh-1 cells) only formed small tumours or could not form tumour at all (Fig. 4h-j).