CD44 and hepatocellular carcinoma: To investigate the influence of CD44 knockdown on the EMT in HCC cells, we transfected lentivirus with shRNA of CD44 or NC into SMMC-7721 and MHCC97-H cells respectively, and got the stably passaged SMMC-7721-KD, SMMC-7721-NC, MHCC97-H-KD and MHCC97-H-NC.