CD44 and cancer: Interestingly, CD44+ population from either live cell fraction or dead cell fraction was decreased after CVV treatment whereas CD44+ populations from dead cells after WT or anti-cancer drugs (cisplatin, sorafenib) treatment was only decreased, showing that CVV can successfully kill CD44+ cell populations, implying that the decreased CD44+ expression in live cells by CVV is the reason for the attenuated migration.